XC9235/XC9236/XC9237 Series
ETR0514-011a
600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters
■GENERAL DESCRIPTION
☆GreenOperation Compatible
The XC9235/XC9236/XC9237 series is a group of synchronous-rectification type DC/DC converters with a built-in 0.42Ω
P-channel MOS driver transistor and 0.52ΩN-channel MOS switching transistor, designed to allow the use of ceramic
capacitors. Operating voltage range is from 2.0V to 6.0V (A∼C types), 1.8V to 6.0V (D∼G types). For the D/F types which
have a reference voltage of 0.8V (accuracy: ±2.0%), the output voltage can be set from 0.9V by using two external resistors.
The A/B/C/E/G types have a fixed output voltage from 0.8V to 4.0V in increments of 0.05V (accuracy: ±2.0%). The device
provides a high efficiency, stable power supply with an output current of 600mA to be configured using only a coil and two
capacitors connected externally.
With the built-in oscillator, either 1.2MHz or 3.0MHz can be selected for suiting to your
particular application. As for operation mode, the XC9235 series is PWM control, the XC9236 series is automatic PWM/PFM
switching control and the XC9237 series can be manually switched between the PWM control mode and the automatic
PWM/PFM switching control mode, allowing fast response, low ripple and high efficiency over the full range of loads (from light
load to heavy load).
The soft start and current control functions are internally optimized. During stand-by, all circuits are shutdown to reduce current
consumption to as low as 1.0μA or less. The B/F/G types have a high speed soft-start as fast as 0.25ms in typical for quick
turn-on. With the built-in UVLO (Under Voltage Lock Out) function, the internal P-channel MOS driver transistor is forced OFF
when input voltage becomes 1.4V or lower.
The B to G types integrate CL discharge function which enables the electric charge at the output capacitor CL to be discharged
via the internal discharge switch located between the LX and VSS pins. When the devices enter stand-by mode, output voltage
quickly returns to the VSS level as a result of this function.
Three types of package SOT-25 (A/B/C types only), USP-6C, and 0.4mm low height USP-6EL (A/B/C types only) are available.
■APPLICATIONS
●Mobile phones, Smart phones
●Bluetooth headsets
●Mobile WiMAX PDAs, MIDs, UMPCs
●Portable game consoles
●Digital cameras, Camcorders
●MP3 Players, Portable Media Players
●Notebook computers
■TYPICAL APPLICATION CIRCUIT
■FEATURES
Driver Transistor Built-In
Input Voltage
Output Voltage
High Efficiency
Output Current
Oscillation Frequency
Maximum Duty Cycle
Control Methods
Function
●XC9235/XC9236/XC9237
A/B/C/E/G types (Output Voltage Fixed)
Capacitor
Packages
Environmentally Friendly
: 0.42Ω P-ch driver transistor
0.52Ω N-ch switch transistor
: 2.0V ~ 6.0V (A/B/C types)
1.8V ~ 6.0V (D/E/F/G types)
: 0.8V ~ 4.0V
: 92% (TYP.)
: 600mA
: 1.2MHz, 3.0MHz (+15%)
: 100%
: PWM (XC9235)
PWM/PFM Auto (XC9236)
PWM/PFM Manual (XC9237)
: Current Limiter Circuit Built-In
(Constant Current & Latching)
CL Discharge (B/C/D/E/F/G types)
High Speed Soft Start (B/F/G type)
: Low ESR Ceramic Capacitor
: SOT-25 (A/B/C types only), USP-6C
USP-6EL(A/B/C types only)
: EU RoHS Compliant, Pb Free
■TYPICAL PERFORMANCE
CHARACTERISTICS
●Efficiency vs. Output Current（fOSC=1.2MHz, VOUT=1.8V）
●XC9235/XC9236/XC9237
100
D/F types (Output Voltage Externally Set)
PWM/PFM Automatic Sw itching Control
Efficiency: EFFI (%)
Efficency:EFFI(%)
90
80
VIN= 4.2V
70
60
50
PWM Control
VIN= 4.2V
3.6V
2.4V
3.6V
2.4V
40
30
20
10
0
0.1
1
10
100
1000
Output Current:IOUT(mA)
1/33
XC9235/XC9236/XC9237 Series
■PIN CONFIGURATION
Lx
VOUT
5
4
1
2
VIN
VSS
VIN
6
1
Lx
VSS
5
2
VSS
CE/MODE 4
3
VOUT (FB)
VIN
6
1
Lx
VSS
5
2
VSS
CE/MODE 4
3
VOUT
3
CE/MODE
SOT-25
(Top View)
USP-6C
(BOTTOM VIEW)
USP-6EL
(BOTTOM VIEW)
* Please short the VSS pin (No. 2 and 5).
* The dissipation pad for the USP-6C package should be solder-plated
in recommended mount pattern and metal masking so as to enhance
mounting strength and heat release. If the pad needs to be connected
to other pins, it should be connected to the VSS (No. 5) pin.
■PIN ASSIGNMENT
PIN NUMBER
SOT-25
USP-6C/USP-6EL
1
6
2
2, 5
3
4
2/33
4
3
5
1
PIN NAME
FUNCTION
VIN
VSS
CE / MODE
VOUT
Power Input
Ground
High Active Enable / Mode Selection Pin
Fixed Output Voltage Pin (A/B/C/E/G types)
Output Voltage Sense Pin (D/F types)
Switching Output
FB
Lx
XC9235/XC9236/XC9237
Series
■PRODUCT CLASSIFICATION
●Ordering Information
XC9235①②③④⑤⑥-⑦(*1)
XC9236①②③④⑤⑥-⑦(*1)
*1
XC9237①②③④⑤⑥-⑦( )
DESIGNATOR
①
DESCRIPTION
Fixed Output voltage (VOUT)
Functional selection
Adjustable Output voltage (FB)
Functional selection
②③
④
Fixed PWM control
PWM / PFM automatic switching control
Fixed PWM control QPWM / PFM automatic switching manual selection
SYMBOL
VIN≧2.0V, No CL discharge, Low speed soft-start
VIN≧2.0V, CL discharge, High speed soft-start
C
VIN≧2.0V, CL discharge, Low speed soft-start
E
VIN≧1.8V, CL discharge, Low speed soft-start
G
VIN≧1.8V, CL discharge, High speed soft-start
D
VIN≧1.8V, CL discharge, Low speed soft-start
F
VIN≧1.8V, CL discharge, High speed soft-start
Output voltage options
e.g. VOUT=2.8V→②=2, ③=8
VOUT=2.85V→②=2, ③=L
0.05V increments: 0.05=A, 0.15=B, 0.25=C, 0.35=D, 0.45=E,
0.55=F, 0.65=H, 0.75=K, 0.85=L, 0.95=M
Reference voltage is fixed in 0.8V
②=0, ③=8
Fixed Output Voltage
(VOUT)
08 ~ 40
Adjustable Output Voltage
(FB)
08
Oscillation Frequency
C
1.2MHz
D
3.0MHz
MR
⑤⑥-⑦
Packages
(*2)
Taping Type
MR-G
ER
ER-G
4R-G
(*1)
(*2)
(*3)
(*4)
(*5)
DESCRIPTION
A
B
SOT-25 (*3)
SOT-25 (Halogen & Antimony free) (*3)
USP-6C
USP-6C (Halogen & Antimony free) (*4)
USP-6EL (Halogen & Antimony free) (*5)
The “-G” suffix indicates that the products are Halogen and Antimony free as well as being fully RoHS compliant.
The device orientation is fixed in its embossed tape pocket. For reverse orientation, please contact your local Torex sales office or
representative. (Standard orientation: ⑤R-⑦, Reverse orientation: ⑤L-⑦)
SOT-25 package is available for the A/B/C series only.
For Halogen & Antimony Free, the D/E/F/G series is under development.
For the USP-6EL package, the D/E/F/G series is under development.
3/33
XC9235/XC9236/XC9237 Series
■BLOCK DIAGRAM
●XC9235 / XC9236 / XC9237
・XC9235/XC9236/XC9237
B,C,E,Gシリーズ
B/C/E/G Series
●XC9235 / XC9236 / XC9237
・XC9235/XC9236/XC9237
AAシリーズ
Series
Phase
Compensation
VOUT
Phase
Compensation
Current Feedback
Current Limit
VOUT
CFB
R2
Error Amp.
R2
PWM
Comparator
FB
Logic
R1
VIN
Synch
Buffer
Drive
Vref with
Soft Start,
CE
Error Amp.
PWM
Comparator
FB
Lx
Logic
R1
VIN
VSHORT
Current Feedback
Current Limit
CFB
Synch
Buffer
Drive
Lx
VSHORT
Vref with
Soft Start,
CE
PWM/PFM
Selector
PWM/PFM
Selector
CE/
Ramp Wave
Generator
OSC
UVLO Cmp
VSS
UVLO Cmp
UVLO
VSS
R3
CE/MODE
Control
Logic
R4
CE/MODE
Ramp Wave
Generator
OSC
UVLO
R3
CE/MODE
Control
Logic
R4
CE/MODE
・XC9235/XC9236/XC9237
●XC9235 / XC9236 / XC9237
D,Fシリーズ
D/F Series
Phase
Compensation
Current Feedback
Current Limit
FB
Error Amp.
PWM
Comparator
Logic
VIN
Synch
Buffer
Drive
Lx
VSHORT
Vref with
Soft Start,
CE
PWM/PFM
Selector
CE/
UVLO Cmp
VSS
Ramp Wave
Generator
OSC
UVLO
R3
CE/MODE
Control
Logic
R4
CE/MODE
NOTE: The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "L" level inside,
and XC9235 series chooses only PWM control.
The signal from CE/MODE Control Logic to PWM/PFM Selector is being fixed to "H" level inside,
and XC9236 series chooses only PWM/PFM automatic switching control.
Diodes inside the circuit are ESD protection diodes and parasitic diodes.
■ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
RATINGS
VIN Pin Voltage
Lx Pin Voltage
VOUT Pin Voltage
FB Pin Voltage
CE / MODE Pin Voltage
Lx Pin Current
SOT-25
Power Dissipation
USP-6C
(*Ta=25℃)
USP-6EL
Operating Temperature Range
Storage Temperature Range
VIN
VLx
VOUT
VFB
VCE
ILx
Pd
- 0.3 ~ 6.5
- 0.3 ~ VIN + 0.3 ≦ 6.5V
- 0.3 ~ 6.5
- 0.3 ~ 6.5
- 0.3 ~ 6.5
±1500
250
100
Topr
Tstg
100
- 40 ~ + 85
- 55 ~ + 125
4/33
Ta=25℃
UNIT
V
V
V
V
V
mA
mW
O
O
C
C
XC9235/XC9236/XC9237
Series
■ELECTRICAL CHARACTERISTICS
XC9237A18Cxx, VOUT=1.8V, fOSC=1.2MHz, Ta=25℃
PARAMETER
SYMBOL
Output Voltage
VOUT
Operating Voltage Range
VIN
CONDITIONS
When connected to external components,
VIN=VCE=5.0V, IOUT=30mA
Maximum Output Current
IOUTMAX
VIN=VOUT(E)+2.0V, VCE=1.0V,
(*9)
When connected to external components
UVLO Voltage
VUVLO
VCE =VIN, VOUT=0V,
(*1, *11)
Voltage which Lx pin holding “L” level
MIN.
TYP.
MAX.
UNIT
CIRCUIT
1.764
1.800
1.836
V
①
2.0
-
6.0
V
①
600
-
-
mA
①
1.00
1.40
1.78
V
②
Supply Current
IDD
VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V
-
15
33
μA
③
Stand-by Current
ISTB
VIN=5.0V, VCE=0V, VOUT=VOUT(E)×1.1V
-
0
1.0
μA
③
Oscillation Frequency
fOSC
When connected to external components,
VIN=VOUT(E)+2.0V, VCE =1.0V, IOUT=100mA
1020
1200
1380
kHz
①
PFM Switching Current
IPFM
When connected to external components,
(*12)
VIN=VOUT(E)+2.0V, VCE =VIN, IOUT=1mA
120
160
200
mA
①
PFM Duty Limit
DTYLIMIT_PFM
Maximum Duty Cycle
DTYMAX
VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V
Minimum Duty Cycle
DTYMIN
VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V
When connected to external components,
VCE=VIN=VOUT(E)+1.2V, IOUT=100mA
(*3)
VIN=VCE=5.0V, VOUT=0V, ILx=100mA
Efficiency
(*2)
EFFI
Lx SW "H" ON Resistance 1
RLxH
VCE=VIN=(C-1), IOUT=1mA
(*12)
200
(*3)
%
①
100
-
-
%
②
-
-
0
%
②
-
92
-
%
①
-
0.35
0.55
Ω
④
Lx SW "H" ON Resistance 2
RLxH
VIN=VCE=3.6V, VOUT=0V, ILx=100mA
-
0.42
0.67
Ω
④
Lx SW "L" ON Resistance 1
RLxL
VIN=VCE=5.0V
(*4)
-
0.45
0.66
Ω
④
Lx SW "L" ON Resistance 2
RLxL
VIN=VCE=3.6V
(*4)
-
0.52
0.77
Ω
-
Lx SW "H" Leak Current
(*5)
ILeakH
VIN=VOUT=5.0V, VCE=0V, Lx=0V
-
0.01
1.0
μA
⑤
Lx SW "L" Leak Current
(*5)
ILeakL
VIN=VOUT=5.0V, VCE=0V, Lx=5.0V
(*10)
Current Limit
Output Voltage
Temperature Characteristics
CE "H" Voltage
CE "L" Voltage
(*8)
ILIM
VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V
△VOUT/
IOUT=30mA, -40℃≦Topr≦85℃
(VOUT・△Topr)
VOUT=0V, Applied voltage to VCE,
VCEH
(*11)
Voltage changes Lx to “H” level
VOUT=0V, Applied voltage to VCE ,
VCEL
(*11)
Voltage changes Lx to “L” level
PWM "H" Level Voltage
VPWMH
PWM "L" Level Voltage
VPWML
CE "H" Current
CE "L" Current
ICEH
ICEL
Soft Start Time
tSS
Latch Time
tLAT
Short Protection Threshold
Voltage
VSHORT
When connected to external components,
(*6)
IOUT=1mA , Voltage which oscillation frequency
(*13)
becomes 1020 kHz≦fOSC≦1380kHz
When connected to external components,
(*6)
IOUT=1mA , Voltage which oscillation frequency
(*13)
becomes fOSC＜1020kHz
VIN=VCE=5.0V, VOUT=0V
VIN=5.0V, VCE=0V, VOUT=0V
When connected to external components,
VCE=0V → VIN, IOUT=1mA
VIN=VCE=5.0V, VOUT=0.8×VOUT(E),
(*7)
Short Lx at 1Ω resistance
Sweeping VOUT, VIN=VCE=5.0V, Short Lx at
1Ω resistance, VOUT voltage which Lx becomes
“L” level within 1ms
-
0.01
1.0
μA
⑤
900
1050
1350
mA
⑥
-
±100
-
ppm/℃
①
0.65
-
6.0
V
③
VSS
-
0.25
V
③
-
-
VIN - 1.0
V
①
VIN –
0.25
-
-
V
①
- 0.1
- 0.1
-
0.1
0.1
μA
μA
⑤
⑤
0.5
1.0
2.5
ms
①
1.0
-
20.0
ms
⑦
0.675
0.900
1.150
V
⑦
Test conditions: Unless otherwise stated, VIN=5.0V, VOUT(E)=Nominal Voltage
NOTE:
*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltage×output current ) / ( input voltage×input current) }×100
*3: ON resistance (Ω)= (VIN - Lx pin measurement voltage) / 100mA
*4: R&D value
*5: When temperature is high, a current of approximately 10μA (maximum) may leak.
*6: The CE/MODE pin of the XC9237A series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the operation,
control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3V, and to the PWM
mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH.
*7: Time until it short-circuits VOUT with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.
*8: When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
*9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
*10: Current limit denotes the level of detection at peak of coil current.
*11: “H”=VIN~VIN-1.2V, “L”=+0.1V~-0.1V
*12: XC9235 series exclude IPFM and DTYLIMIT_PFM because those are only for the PFM control’s functions.
*13: XC9235/9236 series exclude VPWMH and VPWML because those are only for the XC9237 series’ functions.
5/33
XC9235/XC9236/XC9237 Series
■ELECTRICAL CHARACTERISTICS (Continued)
XC9237A18Dxx, VOUT=1.8V, fOSC=3.0MHz, Ta=25℃
PARAMETER
SYMBOL
Output Voltage
VOUT
Operating Voltage Range
VIN
CONDITIONS
When connected to external components,
VIN=VCE=5.0V, IOUT=30mA
Maximum Output Current
IOUTMAX
VIN=VOUT(E)+2.0V, VCE=1.0V,
(*9)
When connected to external components
UVLO Voltage
VUVLO
VCE=VIN, VOUT=0V,
(*1,*11)
Voltage which Lx pin holding “L” level
MIN.
TYP.
MAX.
UNIT
CIRCUIT
1.764
1.800
1.836
V
①
2.0
-
6.0
V
①
600
-
-
mA
①
1.00
1.40
1.78
V
③
Supply Current
IDD
VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V
-
21
35
μA
②
Stand-by Current
ISTB
VIN=5.0V, VCE=0V, VOUT=VOUT(E)×1.1V
-
0
1.0
μA
②
Oscillation Frequency
fOSC
When connected to external components,
VIN=VOUT(E)+2.0V, VCE=1.0V, IOUT=100mA
2550
3000
3450
kHz
①
PFM Switching Current
IPFM
When connected to external components,
(*12)
VIN=VOUT(E)+2.0V, VCE=VIN, IOUT=1mA
170
220
270
mA
①
VCE=VIN=(C-1), IOUT=1mA
(*12)
PFM Duty Limit
DTYLIMIT_PFM
Maximum Duty Cycle
DTYMAX
VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V
Minimum Duty Cycle
DTYMIN
Efficiency
EFFI
VIN=VCE=5.0V, VOUT=VOUT(E)×0.1V
When connected to external components,
VCE=VIN＝VOUT(E)+1.2V, IOUT=100mA
(*3)
VIN=VCE=5.0V, VOUT =0V, ILx=100mA
(*3)
VIN=VCE=3.6V, VOUT =0V, ILx=100mA
(*4)
VIN=VCE=5.0V
(*4)
VIN=VCE=3.6V
VIN=VOUT=5.0V, VCE=0V, Lx=0V
VIN=VOUT=5.0V, VCE=0V, Lx=5.0V
(*8)
VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V
Lx SW "H" ON Resistance 1
RLxH
Lx SW "H" ON Resistance 2
RLxH
Lx SW "L" ON Resistance 1
RLxL
Lx SW "L" ON Resistance 2
RLxL
(*5)
Lx SW "H" Leak Current
ILeakH
(*5)
Lx SW "L" Leak Current
ILeakL
(*10)
Current Limit
ILIM
Output Voltage
△VOUT/
IOUT=30mA, -40℃≦Topr≦85℃
Temperature Characteristics (VOUT・△Topr)
VOUT=0V, Applied voltage to VCE,
CE "H" Voltage
VCEH
(*11)
Voltage changes Lx to “H” level
VOUT=0V, Applied voltage to VCE,
CE "L" Voltage
VCEL
(*11)
Voltage changes Lx to “L” level
PWM "H" Level Voltage
VPWMH
PWM "L" Level Voltage
VPWML
CE "H" Current
CE "L" Current
ICEH
ICEL
Soft Start Time
tSS
Latch Time
tLAT
Short Protection Threshold
Voltage
VSHORT
When connected to external components,
(*6)
IOUT=1mA , Voltage which oscillation frequency
(*13)
becomes 2550kHz≦fOSC≦3450kHz
When connected to external components,
(*6)
IOUT=1mA , Voltage which oscillation frequency
(*13)
becomes fOSC＜2550kHz
VIN=VCE=5.0V, VOUT=0V
VIN=5.0V, VCE=0V, VOUT=0V
When connected to external components,
VCE=0V → VIN, IOUT=1mA
VIN=VCE=5.0V, VOUT=0.8×VOUT(E),
(*7)
Short Lx at 1Ω resistance
Sweeping VOUT, VIN=VCE=5.0V, Short Lx at
1Ω resistance, VOUT voltage which Lx becomes
“L” level within 1ms
-
200
300
%
①
100
-
-
%
③
-
-
0
%
③
-
86
-
%
①
900
0.35
0.42
0.45
0.52
0.01
0.01
1050
0.55
0.67
0.66
0.77
1.0
1.0
1350
Ω
Ω
Ω
Ω
μA
μA
mA
④
④
⑤
⑤
⑥
-
±100
-
ppm/℃
①
0.65
-
6.0
V
③
VSS
-
0.25
V
③
-
-
VIN - 1.0
V
①
VIN –
0.25
-
-
V
①
- 0.1
- 0.1
-
0.1
0.1
μA
μA
⑤
⑤
0.5
0.9
2.5
ms
①
1.0
-
20
ms
⑦
0.675
0.900
1.150
V
⑦
Test conditions: Unless otherwise stated, VIN=5.0V, VOUT(E)=Nominal Voltage
NOTE:
*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltage×output current ) / ( input voltage×input current) }×100
*3: ON resistance (Ω)= (VIN - Lx pin measurement voltage) / 100mA
*4: R&D value
*5: When temperature is high, a current of approximately 10μA (maximum) may leak.
*6: The CE/MODE pin of the XC9237A series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the operation,
control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3V, and to the PWM
mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH.
*7: Time until it short-circuits VOUT with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.
*8: When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
*9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
*10: Current limit denotes the level of detection at peak of coil current.
*11: “H”=VIN~VIN-1.2V, “L”=+0.1V~-0.1V
*12: XC9235 series exclude IPFM and DTYLIMIT_PFM because those are only for the PFM control’s functions.
*13: XC9235/9236 series exclude VPWMH and VPWML because those are only for the XC9237 series’ functions.
6/33
XC9235/XC9236/XC9237
Series
■ELECTRICAL CHARACTERISTICS (Continued)
XC9237B(C)(E)(G)18Cxx, VOUT=1.8V, fOSC=1.2MHz, Ta=25℃
PARAMETER
SYMBOL
Output Voltage
VOUT
Operating Voltage Range (B/C series)
Operating Voltage Range (E/G series)
VIN
Maximum Output Current
IOUTMAX
UVLO Voltage
VUVLO
Supply Current
Stand-by Current
IDD
ISTB
Oscillation Frequency
fOSC
PFM Switching Current
IPFM
CONDITIONS
When connected to external components,
VIN=VCE=5.0V, IOUT=30mA
VIN=VOUT(E)+2.0V, VCE=1.0V,
(*9)
When connected to external components
(*14)
VCE =VIN, VOUT=VOUT(E)×0.5V
(*1, *11)
Voltage which Lx pin holding “L” level
VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V
VIN=5.0V, VCE=0V, VOUT=VOUT(E)×1.1V
When connected to external components,
VIN=VOUT(E)+2.0V, VCE =1.0V, IOUT=100mA
When connected to external components,
(*12)
VIN=VOUT(E)+2.0V, VCE =VIN, IOUT=1mA
(*12)
VCE=VIN=(C-1), IOUT=1mA
PFM Duty Limit
DTYLIMIT_PFM
Maximum Duty Cycle
DTYMAX
VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V
Minimum Duty Cycle
DTYMIN
MIN.
TYP.
MAX.
UNIT
CIRCUIT
1.764
1.800
1.836
V
①
2.0
1.8
-
6.0
6.0
V
①
600
-
-
mA
①
1.00
1.40
1.78
V
②
-
15
0
33
1.0
μA
μA
③
③
1020
1200
1380
kHz
①
120
160
200
mA
①
200
%
①
100
-
-
%
②
-
-
0
%
②
-
92
-
%
①
-
0.35
0.55
Ω
④
(*3)
-
0.42
0.67
Ω
④
-
0.45
0.66
Ω
④
Lx SW "H" ON Resistance 1
RLxH
VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V
When connected to external components,
VCE=VIN=VOUT(E)+1.2V, IOUT=100mA
(*3)
VIN=VCE=5.0V, VOUT (E)×0.9V , ILx=100mA
Lx SW "H" ON Resistance 2
RLxH
VIN=VCE=3.6V, VOUT (E)×0.9V , ILx=100mA
Lx SW "L" ON Resistance 1
RLxL
VIN=VCE=5.0V
(*4)
(*4)
-
0.52
0.77
Ω
-
-
0.01
1.0
μA
⑤
900
1050
1350
mA
⑥
-
±100
-
ppm/℃
①
0.65
-
6.0
V
③
VSS
-
0.25
V
③
-
-
VIN - 1.0
V
①
VIN –
0.25
-
-
V
①
- 0.1
- 0.1
-
0.1
0.1
μA
μA
⑤
⑤
-
0.25
0.40
ms
①
0.5
1.0
2.5
ms
①
1.0
-
20.0
ms
⑦
0.675
0.900
1.150
V
⑦
0.338
0.450
0.563
V
⑦
200
300
450
Ω
⑧
Efficiency
(*2)
EFFI
Lx SW "L" ON Resistance 2
RLxL
VIN=VCE=3.6V
(*5)
ILeakH
VIN=VOUT=5.0V, VCE=0V, Lx=0V
Lx SW "H" Leak Current
(*10)
Current Limit
Output Voltage
Temperature Characteristics
CE "H" Voltage
CE "L" Voltage
(*8)
ILIM
VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V
△VOUT/
I =30mA, -40℃≦Topr≦85℃
(VOUT・△Topr) OUT
VOUT= VOUT(E)×0.9V, Applied voltage to VCE,
VCEH
(*11)
Voltage changes Lx to “H” level
VOUT= VOUT(E)×0.9V, Applied voltage to VCE ,
VCEL
(*11)
Voltage changes Lx to “L” level
PWM "H" Level Voltage
VPWMH
PWM "L" Level Voltage
VPWML
CE "H" Current
CE "L" Current
ICEH
ICEL
Soft Start Time (B/G Series)
tSS
Soft Start Time (C/E Series)
tSS
Latch Time
tLAT
Short Protection Threshold
Voltage (B/C Series)
VSHORT
Short Protection Threshold
Voltage (E/G Series)
VSHORT
CL Discharge
RDCHG
When connected to external components, IOUT=1mA
, Voltage which oscillation frequency becomes 1020
(*13)
kHz≦fOSC≦1380kHz
(*6)
When connected to external components, IOUT=1mA
, Voltage which oscillation frequency becomes fOSC＜
(*13)
1020kHz
VIN=VCE=5.0V, VOUT= VOUT(E)×0.9V
VIN=5.0V, VCE=0V, VOUT= VOUT(E)×0.9V
When connected to external components,
VCE=0V → VIN, IOUT=1mA
When connected to external components,
VCE=0V → VIN, IOUT=1mA
VIN=VCE=5.0V, VOUT=0.8×VOUT(E),
(*7)
Short Lx at 1Ω resistance
Sweeping VOUT, VIN=VCE=5.0V, Short Lx at
1Ω resistance, VOUT voltage which Lx becomes “L”
level within 1ms
(*11)
VIN=VCE=5.0V, The VOUT at Lx=”Low"
while
decreasing VOUT from VOUT (E)×0.4V
(*6)
VIN=5.0V, LX=5.0V, VCE=0V, VOUT=open
Test conditions: Unless otherwise stated, VIN=5.0V, VOUT(E)=Nominal Voltage, applied voltage sequence is VOUT→VIN→VCE
NOTE:
*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltage×output current ) / ( input voltage×input current) }×100
*3: ON resistance (Ω)= (VIN - Lx pin measurement voltage) / 100mA
*4: R&D value
*5: When temperature is high, a current of approximately 10μA (maximum) may leak.
*6: The CE/MODE pin of the XC9237A series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the operation,
control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3V, and to the PWM
mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH.
*7: Time until it short-circuits VOUT with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.
*8: When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
*9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
*10: Current limit denotes the level of detection at peak of coil current.
*11: “H”=VIN~VIN-1.2V, “L”=+0.1V~-0.1V
*12: XC9235 series exclude IPFM and DTYLIMIT_PFM because those are only for the PFM control’s functions.
*13: XC9235/9236 series exclude VPWMH and VPWML because those are only for the XC9237 series’ functions.
*14: VIN is applied when VOUT (E) x 0.5V becomes more than VIN.
7/33
XC9235/XC9236/XC9237 Series
■ELECTRICAL CHARACTERISTICS (Continued)
XC9237B(C)(E)(G)18Dxx, VOUT=1.8V, fOSC=3.0MHz, Ta=25℃
PARAMETER
SYMBOL
Output Voltage
VOUT
Operating Voltage Range (B/C series)
Operating Voltage Range (E/G series)
VIN
Maximum Output Current
IOUTMAX
UVLO Voltage
VUVLO
Supply Current
Stand-by Current
IDD
ISTB
Oscillation Frequency
fOSC
PFM Switching Current
IPFM
CONDITIONS
When connected to external components,
VIN=VCE=5.0V, IOUT=30mA
VIN=VOUT(E)+2.0V, VCE=1.0V,
(*9)
When connected to external components
(*14)
,
VCE=VIN, VOUT=VOUT(E)×0.5V
(*1,*11)
Voltage which Lx pin holding “L” level
VIN=VCE=5.0V, VOUT=VOUT(E)×1.1V
VIN=5.0V, VCE=0V, VOUT=VOUT(E)×1.1V
When connected to external components,
VIN=VOUT(E)+2.0V, VCE=1.0V, IOUT=100mA
When connected to external components,
(*12)
VIN=VOUT(E)+2.0V, VCE=VIN, IOUT=1mA
(*12)
VCE=VIN=(C-1), IOUT=1mA
PFM Duty Limit
DTYLIMIT_PFM
Maximum Duty Cycle
DTYMAX
VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V
Minimum Duty Cycle
DTYMIN
Efficiency
EFFI
VIN=VCE=5.0V, VOUT=VOUT(E)×0.1V
When connected to external components,
VCE=VIN＝VOUT(E)+1.2V, IOUT=100mA
(*3)
VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V, ILx=100mA
(*3)
VIN=VCE=3.6V, VOUT=VOUT(E)×0.9V, ILx=100mA
(*4)
VIN=VCE=5.0V
(*4)
VIN=VCE=3.6V
VIN=VOUT=5.0V, VCE=0V, Lx=0V
(*8)
VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V
Lx SW "H" ON Resistance 1
Lx SW "H" ON Resistance 2
Lx SW "L" ON Resistance 1
Lx SW "L" ON Resistance 2
(*5)
Lx SW "H" Leak Current
(*10)
Current Limit
Output Voltage
Temperature Characteristics
CE "H" Voltage
CE "L" Voltage
RLxH
RLxH
RLxL
RLxL
ILeakH
ILIM
△VOUT/
I =30mA, -40℃≦Topr≦85℃
(VOUT・△Topr) OUT
VOUT=VOUT(E)×0.9V, Applied voltage to VCE,
VCEH
(*11)
Voltage changes Lx to “H” level
VOUT=VOUT(E)×0.9V, Applied voltage to VCE,
VCEL
(*11)
Voltage changes Lx to “L” level
When connected to external components,
(*6)
IOUT=1mA , Voltage which oscillation frequency
(*13)
becomes 2550kHz≦fOSC≦3450kHz
PWM "H" Level Voltage
VPWMH
PWM "L" Level Voltage
VPWML
CE "H" Current
CE "L" Current
ICEH
ICEL
Soft Start Time (B/G Series)
tSS
Soft Start Time (C/E Series)
tSS
Latch Time
tLAT
Short Protection Threshold
Voltage (B/C Series)
VSHORT
Short Protection Threshold
Voltage (E/G Series)
VSHORT
VIN=VCE=5.0V, The VOUT at Lx=”Low"
decreasing VOUT from VOUT (E)×0.4V
CL Discharge
RDCHG
VIN=5.0V, LX=5.0V, VCE=0V, VOUT=open
When connected to external components,
(*6)
IOUT=1mA , Voltage which oscillation frequency
(*13)
becomes fOSC＜2550kHz
VIN=VCE=5.0V, VOUT=VOUT(E)×0.9V
VIN=5.0V, VCE=0V, VOUT=VOUT(E)×0.9V
When connected to external components,
VCE=0V → VIN, IOUT=1mA
When connected to external components,
VCE=0V → VIN, IOUT=1mA
VIN=VCE=5.0V, VOUT=0.8×VOUT(E),
(*7)
Short Lx at 1Ω resistance
Sweeping VOUT, VIN=VCE=5.0V, Short Lx at
1Ω resistance, VOUT voltage which Lx becomes “L”
level within 1ms
(*11)
while
MIN.
TYP.
MAX.
UNIT
CIRCUIT
1.764
1.800
1.836
V
①
2.0
1.8
-
6.0
6.0
V
①
600
-
-
mA
①
1.00
1.40
1.78
V
③
-
21
0
35
1.0
μA
μA
②
②
2550
3000
3450
kHz
①
170
220
270
mA
①
-
200
300
%
①
100
-
-
%
③
-
-
0
%
③
-
86
-
%
①
900
0.35
0.42
0.45
0.52
0.01
1050
0.55
0.67
0.66
0.77
1.0
1350
Ω
Ω
Ω
Ω
μA
mA
④
④
⑤
⑥
-
±100
-
ppm/℃
①
0.65
-
6.0
V
③
VSS
-
0.25
V
③
-
-
VIN - 1.0
V
①
VIN –
0.25
-
-
V
①
- 0.1
- 0.1
-
0.1
0.1
μA
μA
⑤
⑤
-
0.32
0.50
ms
①
0.5
0.9
2.5
ms
①
1.0
-
20
ms
⑦
0.675
0.900
1.150
V
⑦
0.338
0.450
0.563
V
⑦
200
300
450
Ω
⑧
Test conditions: Unless otherwise stated, VIN=5.0V, VOUT(E)=Nominal Voltage, applied voltage sequence is VOUT→VIN→VCE
NOTE:
*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltage×output current ) / ( input voltage×input current) }×100
*3: ON resistance (Ω)= (VIN - Lx pin measurement voltage) / 100mA
*4: R&D value
*5: When temperature is high, a current of approximately 10μA (maximum) may leak.
*6: The CE/MODE pin of the XC9237A series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the operation,
control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3V, and to the PWM
mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH.
*7: Time until it short-circuits VOUT with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.
*8: When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
*9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
*10: Current limit denotes the level of detection at peak of coil current.
*11: “H”=VIN~VIN-1.2V, “L”=+0.1V~-0.1V
*12: XC9235 series exclude IPFM and DTYLIMIT_PFM because those are only for the PFM control’s functions.
*13: XC9235/9236 series exclude VPWMH and VPWML because those are only for the XC9237 series’ functions.
*14: VIN is applied when VOUT (E) x 0.5V becomes more than VIN.
8/33
XC9235/XC9236/XC9237
Series
■ELECTRICAL CHARACTERISTICS (Continued)
●XC9237D(F)08Cxx, FB Type, fOSC=1.2MHz, Ta=25℃
PARAMETER
SYMBOL
CONDITIONS
(*11)
FB Voltage
VFB
Operating Voltage Range
VIN
Maximum Output Current
IOUTMAX
UVLO Voltage
VUVLO
Supply Current
Stand-by Current
IDD
ISTB
Oscillation Frequency
fOSC
PFM Switching Current
IPFM
VIN = VCE =5.0V, The VFB at Lx=”High"
decreasing FB pin voltage from 0.9V.
while
VIN=3.2V, VCE=1.0V
(*9)
When connected to external components
VCE = VIN , VFB = 0.4V,
(*1,*11)
Voltage which Lx pin holding “L” level
VIN =VCE=5.0V, VFB= 0.88V
VIN =5.0V, VCE=0V, VFB= 0.88V
When connected to external components,
VIN = 3.2V, VCE=1.0V, IOUT=100mA
When connected to external components,
(*12)
VIN =3.2V, VCE = VIN , IOUT=1mA
(*12)
VCE= VIN =2.0V IOUT=1mA
PFM Duty Limit
DTYLIMIT_PFM
Maximum Duty Cycle
DTYMAX
VIN = VCE =5.0V, VFB = 0.72V
Minimum Duty Cycle
DTYMIN
VIN = VCE =5.0V, VFB = 0.88V
When connected to external components,
VCE = VIN ＝ 2.4V, IOUT = 100mA
(*3)
VIN = VCE = 5.0V, VFB = 0.72V,ILX = 100mA
(*3)
VIN = VCE = 3.6V, VFB = 0.72V,ILX = 100mA
(*4)
VIN = VCE = 5.0V
(*4)
VIN = VCE = 3.6V
VIN = VFB = 5.0V, VCE = 0V, LX= 0V
(*8)
VIN = VCE= 5.0V, VFB = 0.72V
IOUT =30mA
-40℃≦Topr≦85℃
VFB =0.72V, Applied voltage to VCE,
(*11)
Voltage changes Lx to “H” level
VFB =0.72V, Applied voltage to VCE,
(*11)
Voltage changes Lx to “L” level
When connected to external components,
(*6)
IOUT=1mA , Voltage which oscillation
frequency becomes 1020kHz≦fOSC≦1380kHz
Efficiency
(*2)
EFFI
Lx SW "H" ON Resistance 1
Lx SW "H" ON Resistance 2
Lx SW "L" ON Resistance 1
Lx SW "L" ON Resistance 2
(*5)
Lx SW "H" Leak Current
(*10)
Current Limit
Output Voltage
Temperature Characteristics
RLｘH
RLｘH
RLｘL
RLｘL
ILeakH
ILIM
△VOUT/
(VOUT・△Topr)
CE "H" Voltage
VCEH
CE "L" Voltage
VCEL
PWM "H" Level Voltage
VPWMH
MIN.
TYP.
MAX.
UNIT
CIRCUIT
0.784
0.800
0.816
V
③
1.8
-
6.0
V
①
600
-
-
mA
①
1.00
1.40
1.78
V
③
-
15
0
1.0
μA
μA
②
②
1020
1200
1380
kHz
①
120
160
200
mA
①
%
①
100
200
-
-
%
③
-
-
0
%
③
-
92
-
%
①
900
0.35
0.42
0.45
0.52
0.01
1050
0.55
0.67
0.66
0.77
1.0
1350
Ω
Ω
Ω
Ω
μA
mA
④
④
⑨
⑥
-
±100
-
ppm/ ℃
①
0.65
-
6.0
V
③
VSS
-
0.25
V
③
-
-
VIN - 1.0
V
①
VIN 0.25
-
-
V
①
- 0.1
- 0.1
0.5
-
1.0
0.25
0.1
0.1
2.5
0.40
μA
μA
⑤
⑤
ms
①
1.0
-
20.0
ms
⑦
0.15
0.200
0.25
V
⑦
200
300
450
Ω
⑧
(*13)
PWM "L" Level Voltage
VPWML
CE "H" Current
CE "L" Current
Soft Start Time (D series)
Soft Start Time (F series)
ICEH
ICEL
Latch Time
tLAT
Short Protection Threshold
Voltage
VSHORT
CL Discharge
RDCHG
tSS
When connected to external components,
(*6)
IOUT=1mA , Voltage which oscillation
(*13)
frequency becomes fOSC＜1020kHz
VIN = VCE =5.0V, VFB =0.72V
VIN =5.0V, VCE = 0V, VFB =0.72V
When connected to external components,
VCE = 0V → VIN , IOUT=1mA
VIN=VCE=5.0V, VFB=0.64, Short Lx at 1Ω
(*7)
resistance
(*11)
while
VIN = VCE =5.0V, The VFB at Lx=”Low"
decreasing FB pin voltage from 0.4V.
VIN = 5.0V ,LX = 5.0V, VCE = 0V, VFB= open
Test conditions: VOUT=1.2V when the external components are connected. Unless otherwise stated, VIN=5.0V, VOUT(E)=Nominal Voltage, applied voltage sequence is
VOUT→VIN→VCE
NOTE:
*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltage×output current ) / ( input voltage×input current) }×100
*3: ON resistance (Ω)= (VIN - Lx pin measurement voltage) / 100mA
*4: R&D value
*5: When temperature is high, a current of approximately 10μA (maximum) may leak.
*6: The CE/MODE pin of the XC9237A series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the operation,
control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3V, and to the PWM
mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH.
*7: Time until it short-circuits VFB with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.
*8: When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
*9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
*10: Current limit denotes the level of detection at peak of coil current.
*11: “H”=VIN~VIN-1.2V, “L”=+0.1V~-0.1V
*12: XC9235 series exclude IPFM and DTYLIMIT_PFM because those are only for the PFM control’s functions.
*13: XC9235/9236 series exclude VPWMH and VPWML because those are only for the XC9237 series’ functions.
9/33
XC9235/XC9236/XC9237 Series
■ELECTRICAL CHARACTERISTICS (Continued)
●XC9237D(F)08Dxx, FB, fOSC=3.0MHz, Ta=25℃
PARAMETER
SYMBOL
FB Voltage
VFB
Operating Voltage Range
VIN
CONDITIONS
(*11)
VIN = VCE =5.0V, The VFB at Lx=”High"
decreasing FB pin voltage from 0.9V.
while
Maximum Output Current
IOUTMAX
VIN=3.2V, VCE=1.0V
(*9)
When connected to external components
UVLO Voltage
VUVLO
VCE = VIN , VFB = 0.4V ,
(*1, *11)
Voltage which Lx pin holding “L” level
MIN.
TYP.
MAX.
UNIT
CIRCUIT
0.784
0.800
0.816
V
③
1.8
-
6.0
V
①
600
-
-
mA
①
1.00
1.40
1.78
V
③
Supply Current
IDD
VIN =VCE=5.0V, VFB= 0.88V
-
21
35
μA
②
Stand-by Current
ISTB
-
0
1.0
μA
②
Oscillation Frequency
fOSC
2550
3000
3450
kHz
①
PFM Switching Current
IPFM
VIN =5.0V, VCE=0V, VFB= 0.88V
When connected to external components,
VIN = 3.2V, VCE=1.0V, IOUT=100mA
When connected to external components,
(*12)
VIN =3.2V, VCE = VIN , IOUT=1mA
170
220
270
mA
①
(*12)
PFM Duty Limit
DTYLIMIT_PFM
Maximum Duty Cycle
DTYMAX
VIN = VCE =5.0V, VFB = 0.72V
Minimum Duty Cycle
DTYMIN
VIN = VCE =5.0V, VFB = 0.88V
When connected to external components,
VCE = VIN ＝ 2.4V, IOUT = 100mA
(*3)
VIN = VCE = 5.0V, VFB = 0.72V,ILX = 100mA
(*3)
VIN = VCE = 3.6V, VFB = 0.72V,ILX = 100mA
(*4)
VIN = VCE = 5.0V
(*4)
VIN = VCE = 3.6V
VIN = VFB = 5.0V, VCE = 0V, LX= 0V
(*8)
VIN = VCE= 5.0V, VFB = 0.72V
IOUT =30mA
-40℃≦Topr≦85℃
VFB =0.72V , VCE,
(*11)
Voltage changes Lx to “H” level
VFB =0.72V, VCE,
(*11)
Voltage changes Lx to “L” level
When connected to external components,
(*6)
IOUT = 1mA , Voltage which oscillation frequency
(*13)
becomes 2550kHz≦fOSC≦3450kHz
When connected to external components,
(*6)
IOUT = 1mA , Voltage which oscillation frequency
(*13)
becomes fOSC＜2550kHz
VIN = VCE =5.0V, VFB =0.72V
VIN =5.0V, VCE = 0V, VFB =0.72V
When connected to external components,
VCE = 0V → VIN , IOUT=1mA
VIN = VCE = 5.0V, VFB = 0.64,
(*7)
Short Lx at 1Ω resistance
(*11)
VIN = VCE =5.0V, The VFB at Lx=”Low"
while
decreasing FB pin voltage from 0.4V.
Efficiency
(*2)
EFFI
Lx SW "H" ON Resistance 1
Lx SW "H" ON Resistance 2
Lx SW "L" ON Resistance 1
Lx SW "L" ON Resistance 2
(*5)
Lx SW "H" Leak Current
(*10)
Current Limit
Output Voltage
Temperature Characteristics
RLｘH
RLｘH
RLｘL
RLｘL
ILeakH
ILIM
△VOUT/
(VOUT・△Topr)
CE "H" Voltage
VCEH
CE "L" Voltage
VCEL
PWM "H" Level Voltage
VPWMH
PWM "L" Level Voltage
VPWML
CE "H" Current
CE "L" Current
Soft Start Time (D series)
Soft Start Time (F series)
ICEH
ICEL
Latch Time
tLAT
Short Protection Threshold
Voltage
VSHORT
CL Discharge
RDCHG
tSS
VCE= VIN =2.2V IOUT=1mA
VIN = 5.0V ,LX = 5.0V ,VCE = 0V ,VFB= open
200
300
%
①
100
-
-
%
③
-
-
0
%
③
-
86
-
%
①
900
0.35
0.42
0.45
0.52
0.01
1050
0.55
0.67
0.66
0.77
1.0
1350
Ω
Ω
Ω
Ω
μA
mA
④
④
⑨
⑥
-
±100
-
ppm/ ℃
①
0.65
-
6.0
V
③
VSS
-
0.25
V
③
-
-
VIN - 1.0
V
①
VIN 0.25
-
-
V
①
- 0.1
- 0.1
0.5
-
1.0
0.25
0.1
0.1
2.5
0.40
μA
μA
⑤
⑤
ms
①
1.0
-
20.0
ms
⑦
0.15
0.200
0.25
V
⑦
200
300
450
Ω
⑧
Test conditions: VOUT=1.2V when the external components are connected. Unless otherwise stated, VIN=5.0V, VOUT(E)=Nominal Voltage, applied voltage sequence is
VOUT→VIN→VCE
NOTE:
*1: Including hysteresis operating voltage range.
*2: EFFI = { ( output voltage×output current ) / ( input voltage×input current) }×100
*3: ON resistance (Ω)= (VIN - Lx pin measurement voltage) / 100mA
*4: R&D value
*5: When temperature is high, a current of approximately 10μA (maximum) may leak.
*6: The CE/MODE pin of the XC9237A series works also as an external switching pin of PWM control and PWM/PFM control. When the IC is in the operation,
control is switched to the automatic PWM/PFM switching mode when the CE/MODE pin voltage is equal to or greater than VIN minus 0.3V, and to the PWM
mode when the CE/MODE pin voltage is equal to or lower than VIN minus 1.0V and equal to or greater than VCEH.
*7: Time until it short-circuits VFB with GND via 1Ωof resistor from an operational state and is set to Lx=0V from current limit pulse generating.
*8: When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
*9: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
*10: Current limit denotes the level of detection at peak of coil current.
*11: “H”=VIN~VIN-1.2V, “L”=+0.1V~-0.1V
*12: XC9235 series exclude IPFM and DTYLIMIT_PFM because those are only for the PFM control’s functions.
*13: XC9235/9236 series exclude VPWMH and VPWML because those are only for the XC9237 series’ functions.
10/33
XC9235/XC9236/XC9237
Series
■ELECTRICAL CHARACTERISTICS (Continued)
●PFM Switching Current (IPFM) by Oscillation Frequency and Setting Voltage
(mA)
SETTING VOLTAGE
VOUT(E) ≦1.2V
1.2V＜VOUT(E) ≦1.75V
1.8V≦VOUT(E)
MIN.
1.2MHz
TYP.
MAX.
140
130
120
180
170
160
240
220
200
MIN.
3.0MHz
TYP.
MAX.
190
180
170
260
240
220
350
300
270
●Input Voltage (VIN) for Measuring PFM Duty Limit (DTYLIMIT_PFM)
fOSC
C-1
1.2MHz
VOUT(E)+0.5V
3.0MHz
VOUT(E)+1.0V
Minimum operating voltage is 2.0V.
ex.) Although when VOUT(E) is 1.2V and fOSC is 1.2MHz, (C-1) should be 1.7V, (C-1) becomes 2.0V for the minimum operating voltage 2.0V.
●Soft-Start Time, Setting Voltage（XC9235B(G)/9236B(G)/9237B(G) Series only）
SERIES
XC9235B(G)/XC9237B(G)
XC9236B(G)
XC9235B(G)/
XC9236B(G)/XC9237B(G)
(μs)
fOSC
SETTING VOLTAGE
MIN.
TYP.
MAX.
1.2MHz
1.2MHz
0.8≦V OUT(E)<1.5
-
250
400
1.5≦V OUT(E)<1.8
-
320
500
1.2MHz
1.8≦V OUT(E)<2.5
-
280
400
1.2MHz
2.5≦V OUT(E)<4.0
-
320
500
1.2MHz
0.8≦V OUT(E)<2.5
-
280
400
1.2MHz
2.5≦V OUT(E)<4.0
-
320
500
3.0MHz
0.8≦V OUT(E)<1.8
-
280
400
3.0MHz
1.8≦V OUT(E)<4.0
-
320
500
11/33
XC9235/XC9236/XC9237 Series
■TYPICAL APPLICATION CIRCUIT
●XC9235/9236/9237A, B, C, E, G Series (Output Voltage Fixed)
VOUT
600mA
L
VIN
Lx
VSS
VIN
VSS
C IN
(ceramic)
CL
(ceramic)
VOUT
CE/
MODE
CE/MODE
●fOSC=3.0MHz
L:
1.5μH
CIN:
4.7μF
CL:
10μF
●fOSC=1.2MHz
L:
4.7μH
CIN:
4.7μF
CL:
10μF
(NR3015, TAIYO YUDEN)
(Ceramic)
(Ceramic)
(NR4018, TAIYO YUDEN)
(Ceramic)
(Ceramic)
●XC9235/9236/9237D, F Series (Output Voltage External Setting)
<Setting for Output Voltage>
Output voltage can be set externally by adding two resistors to the FB pin. The output voltage is calculated by the RFB1 and
RFB2 value. The total of RFB1 and RFB2 is usually selected less than 1MΩ.
VOUT=0.8 × (RFB1+RFB2)/RFB2
The value of the phase compensation speed-up capacitor CFB is calculated by the formula of fZFB = 1/(2×π×CFB1×RFB1) with
fZFB <10kHz. For optimization, fZFB can be adjusted in the range of 1kHz to 20kHz depending on the inductance L and
the load capacitance CL which are used.
【Formula】
When RFB1=470kΩ and RFB2=150k, VOUT1=0.8 × (470k+150k) / 150k=3.3V
【Example】
VOUT
RFB1
(kΩ)
(V)
0.9
100
1.2
150
1.5
130
1.8
300
12/33
RFB2
(kΩ)
820
300
150
240
CFB
(pF)
150
100
220
150
VOUT
(V)
2.5
3.0
3.3
4.0
RFB1
(kΩ)
510
330
470
120
RFB2
(kΩ)
240
120
150
30
CFB
(pF)
100
150
100
470
XC9235/XC9236/XC9237
Series
■OPERATIONAL DESCRIPTION
The XC9235/XC9236/XC9237 series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM
comparator, phase compensation circuit, output voltage adjustment resistors, P-channel MOS driver transistor, N-channel MOS
switching transistor for the synchronous switch, current limiter circuit, UVLO circuit and others. (See the block diagram
above.) The series ICs compare, using the error amplifier, the voltage of the internal voltage reference source with the feedback
voltage from the VOUT pin through split resistors, R1 and R2. Phase compensation is performed on the resulting error
amplifier output, to input a signal to the PWM comparator to determine the turn-on time during PWM operation. The PWM
comparator compares, in terms of voltage level, the signal from the error amplifier with the ramp wave from the ramp wave
circuit, and delivers the resulting output to the buffer driver circuit to cause the Lx pin to output a switching duty cycle. This
process is continuously performed to ensure stable output voltage. The current feedback circuit monitors the P-channel MOS
driver transistor current for each switching operation, and modulates the error amplifier output signal to provide multiple
feedback signals. This enables a stable feedback loop even when a low ESR capacitor such as a ceramic capacitor is used
ensuring stable output voltage.
<Reference Voltage Source>
The reference voltage source provides the reference voltage to ensure stable output voltage of the DC/DC converter.
<Ramp Wave Circuit>
The ramp wave circuit determines switching frequency. The frequency is fixed internally and can be selected from 1.2MHz or
3.0MHz. Clock pulses generated in this circuit are used to produce ramp waveforms needed for PWM operation, and to
synchronize all the internal circuits.
<Error Amplifier>
The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the feedback
voltage divided by the internal split resistors, R1 and R2. When a voltage lower than the reference voltage is fed back, the
output voltage of the error amplifier increases. The gain and frequency characteristics of the error amplifier output are fixed
internally to deliver an optimized signal to the mixer.
<Current Limit>
The current limiter circuit of the XC9235/XC9236/XC9237 series monitors the current flowing through the P-channel MOS
driver transistor connected to the Lx pin, and features a combination of the current limit mode and the operation suspension
mode.
① When the driver current is greater than a specific level, the current limit function operates to turn off the pulses from the Lx
pin at any given timing.
② When the driver transistor is turned off, the limiter circuit is then released from the current limit detection state.
③ At the next pulse, the driver transistor is turned on. However, the transistor is immediately turned off in the case of an over
current state.
④ When the over current state is eliminated, the IC resumes its normal operation.
The IC waits for the over current state to end by repeating the steps ① through ③. If an over current state continues for a
few ms and the above three steps are repeatedly performed, the IC performs the function of latching the OFF state of the
driver transistor, and goes into operation suspension mode. Once the IC is in suspension mode, operations can be
resumed by either turning the IC off via the CE/MODE pin, or by restoring power to the VIN pin. The suspension mode does
not mean a complete shutdown, but a state in which pulse output is suspended; therefore, the internal circuitry remains in
operation. The current limit of the XC9235/XC9236/XC9237 series can be set at 1050mA at typical. Besides, care must
be taken when laying out the PC Board, in order to prevent misoperation of the current limit mode. Depending on the state
of the PC Board, latch time may become longer and latch operation may not work. In order to avoid the effect of noise, the
board should be laid out so that input capacitors are placed as close to the IC as possible.
13/33
XC9235/XC9236/XC9237 Series
■OPERATIONAL DESCRIPTION (Continued)
<Short-Circuit Protection>
The short-circuit protection circuit monitors the internal R1 and R2 divider voltage from the VOUT pin (refer to FB point in
the block diagram shown in the previous page). In case where output is accidentally shorted to the Ground and when
the FB point voltage decreases less than half of the reference voltage (Vref) and a current more than the ILIM flows to
the Pch MOS driver transistor, the short-circuit protection quickly operates to turn off and to latch the driver transistor.
For the D/E/F/G series, it does not matter how much the current limit, once the FB voltage become less than the
quarter of reference voltage (VREF), the short-circuit protection operates to latch the Pch MOS driver transistor. In
latch mode, the operation can be resumed by either turning the IC off and on via the CE/MODE pin, or by restoring
power supply to the VIN pin.
When sharp load transient happens, a voltage drop at the VOUT is propagated to the FB point through CFB, as a result,
short circuit protection may operate in the voltage higher than 1/2 VOUT voltage.
<UVLO Circuit>
When the VIN pin voltage becomes 1.4V or lower, the Pch MOS driver transistor output driver transistor is forced OFF to
prevent false pulse output caused by unstable operation of the internal circuitry. When the VIN pin voltage becomes 1.8V
or higher, switching operation takes place. By releasing the UVLO function, the IC performs the soft start function to
initiate output startup operation. The soft start function operates even when the VIN pin voltage falls momentarily below
the UVLO operating voltage. The UVLO circuit does not cause a complete shutdown of the IC, but causes pulse output to
be suspended; therefore, the internal circuitry remains in operation.
<PFM Switch Current>
In PFM control operation, until coil current reaches to a specified level (IPFM), the IC keeps the Pch MOS driver transistor
on. In this case, time that the Pch MOS driver transistor is kept on (TON) can be given by the following formula.
TON= L×IPFM / (VIN−VOUT) →IPFM①
< PFM Duty Limit >
In PFM control operation, the PFM duty limit (DTYLIMIT_PFM) is set to 200% (TYP.). Therefore, under the condition that the
duty increases (e.g. the condition that the step-down ratio is small), it’s possible for Pch MOS driver transistor to be turned
→IPFM②
off even when coil current doesn’t reach to IPFM.
Ton
PFM
Duty Limit
PFMデューティ制限
Lx
Lx
IPFM
I Lx
FOSC
IPFM
I Lx
0mA
図 IPFM ①
14/33
0mA
図 IPFM ②
XC9235/XC9236/XC9237
Series
■OPERATIONAL DESCRIPTION (Continued)
＜CL High Speed Discharge＞
XC9235B(C)(D)(E)(F)(G)/ XC9236B(C)(D)(E)(F)(G)/ XC9237B(C)(D)(E)(F)(G) series can quickly discharge the electric
charge at the output capacitor (CL) when a low signal to the CE pin which enables a whole IC circuit put into OFF state, is
inputted via the Nch MOS switch transistor located between the LX pin and the VSS pin. When the IC is disabled, electric
charge at the output capacitor (CL) is quickly discharged so that it may avoid application malfunction. Discharge time of the
output capacitor (CL) is set by the CL auto-discharge resistance (R) and the output capacitor (CL). By setting time constant
of a CL auto-discharge resistance value [R] and an output capacitor value (CL) as τ(τ=C x R), discharge time of the
output voltage after discharge via the N channel transistor is calculated by the following formulas.
–t/
V = VOUT(E) x e τ or t=τln (VOUT(E) / V)
V : Output voltage after discharge
VOUT(E) : Output voltage
t: Discharge time,
τ: C x R
C= Capacitance of Output capacitor (CL)
R= CL auto-discharge resistance
Output Voltage Dischage Characteristics
Rdischg = 300Ω（ TYP）
100
90
CL=10uF
80
CL=20uF
70
CL=50uF
60
50
40
30
20
10
0
0
10
20
30
40
50
60
70
80
90
100
Discharge Time t (ms)
15/33
XC9235/XC9236/XC9237 Series
■OPERATIONAL DESCRIPTION (Continued)
<CE/MODE Pin Function>
The operation of the XC9235/XC9236/XC9237 series will enter into the shut down mode when a low level signal is input to the
CE/MODE pin. During the shutdown mode, the current consumption of the IC becomes 0μA (TYP.), with a state of high
impedance at the Lx pin and VOUT pin. The IC starts its operation by inputting a high level signal to the CE/MODE pin. The
input to the CE/MODE pin is a CMOS input and the sink current is 0μA (TYP.).
●XC9235/XC9236 series - Examples of how to use CE/MODE pin
(A)
SW＿CE
STATUS
ON
Stand-by
OFF
Operation
(B)
SW＿CE
STATUS
ON
Operation
OFF
Stand-by
(A)
(B)
●XC9237 series - Examples of how to use CE/MODE pin
(A)
SW＿CE
SW＿PWM/PFM
STATUS
ON
*
PWM/PFM Automatic Switching Control
OFF
ON
PWM Control
OFF
OFF
Stand-by
SW＿CE
SW＿PWM/PFM
STATUS
(B)
ON
*
Stand-by
OFF
ON
PWM Control
OFF
OFF
PWM/PFM Automatic Switching Control
(A)
Intermediate voltage can be generated by RM1 and RM2. Please set the value of each R1, R2, RM1, RM2 from
few hundreds kΩ to few hundreds MΩ. For switches, CPU open-drain I/O port and transistor can be used.
16/33
(B)
XC9235/XC9236/XC9237
Series
■OPERATIONAL DESCRIPTION (Continued)
＜Soft Start＞
Soft start time is available in two options via product selection.
The A,C,D,and E types of XC9235/XC9236/XC9237 series provide 1.0ms (TYP).
The B,F, and G types of XC9235/ XC9236/XC9237 series provide 0.25ms (TYP). However, for the D/F the soft-start time can
be set by the external components. Soft start time is defined as the time interval to reach 90% of the output voltage from the
time when the CE pin is turned on.
90% of setting voltage
■FUNCTION CHART
CE/MODE
VOLTAGE LEVEL
OPERATIONAL STATES
XC9235
XC9236
XC9237
H Level (*1)
Synchronous
PWM Fixed Control
Synchronous
PWM/PFM
Automatic Switching
M Level (*2)
━
━
Synchronous
PWM/PFM
Automatic Switching
Synchronous
PWM Fixed Control
L Level (*3)
Stand-by
Stand-by
Stand-by
Note on CE/MODE pin voltage level range
(*1) H level: 0.65V < H level < VIN V (for XC9235/XC9236)
H level: VIN – 0.25V < H level < VIN (for XC9237)
(*2) M level: 0.65V < M level < VIN - 1.0V (for XC9237)
(*3) L level: 0V < L level < 0.25V
17/33
XC9235/XC9236/XC9237 Series
■NOTE ON USE
1. The XC9235/XC9236/XC9237 series is designed for use with ceramic output capacitors. If, however, the potential
difference is too large between the input voltage and the output voltage, a ceramic capacitor may fail to absorb the resulting
high switching energy and oscillation could occur on the output. If the input-output potential difference is large, connect an
electrolytic capacitor in parallel to compensate for insufficient capacitance.
2. Spike noise and ripple voltage arise in a switching regulator as with a DC/DC converter. These are greatly influenced by
external component selection, such as the coil inductance, capacitance values, and board layout of external components.
Once the design has been completed, verification with actual components should be done.
3. Depending on the input-output voltage differential, or load current, some pulses may be skipped, and the ripple voltage may
increase.
4. When the difference between VIN and VOUT is large in PWM control, very narrow pulses will be outputted, and there is the
possibility that some cycles may be skipped completely.
5. When the difference between VIN and VOUT is small, and the load current is heavy, very wide pulses will be outputted and
there is the possibility that some cycles may be skipped completely.
6. With the IC, the peak current of the coil is controlled by the current limit circuit. Since the peak current increases when
dropout voltage or load current is high, current limit starts operation, and this can lead to instability. When peak current
becomes high, please adjust the coil inductance value and fully check the circuit operation. In addition, please calculate
the peak current according to the following formula:
Ipk = (VIN - VOUT) x OnDuty / (2 x L x fOSC) + IOUT
L: Coil Inductance Value
fOSC: Oscillation Frequency
7. When the peak current which exceeds limit current flows within the specified time, the built-in Pch MOS driver transistor
turns off. During the time until it detects limit current and before the built-in transistor can be turned off, the current for limit
current flows; therefore, care must be taken when selecting the rating for the external components such as a coil.
8. When VIN is less than 2.4V, limit current may not be reached because voltage falls caused by ON resistance.
9. Care must be taken when laying out the PC Board, in order to prevent misoperation of the current limit mode. Depending
on the state of the PC Board, latch time may become longer and latch operation may not work. In order to avoid the effect of
noise, the board should be laid out so that input capacitors are placed as close to the IC as possible.
10. Use of the IC at voltages below the recommended voltage range may lead to instability.
11. This IC should be used within the stated absolute maximum ratings in order to prevent damage to the device.
12. When the IC is used in high temperature, output voltage may increase up to input voltage level at no load because of the
leak current of the driver transistor.
13. The current limit is set to 1350mA (MAX.) at typical. However, the current of 1350mA or more may flow. In case that the
current limit functions while the VOUT pin is shorted to the GND pin, when Pch MOS driver transistor is ON, the potential
difference for input voltage will occur at both ends of a coil. For this, the time rate of coil current becomes large. By
contrast, when Nch MOS driver transistor is ON, there is almost no potential difference at both ends of the coil since the
VOUT pin is shorted to the GND pin. Consequently, the time rate of coil current becomes quite small. According to the
repetition of this operation, and the delay time of the circuit, coil current will be converged on a certain current value,
exceeding the amount of current, which is supposed to be limited originally. Even in this case, however, after the over
current state continues for several ms, the circuit will be latched. A coil should be used within the stated absolute
maximum rating in order to prevent damage to the device.
①Current flows into Pch MOS driver transistor to reach the current limit (ILIM).
②The current of ILIM or more flows since the delay time of the circuit occurs during from the detection of the current limit to
OFF of Pch MOS driver transistor.
③Because of no potential difference at both ends of the coil, the time rate of coil current becomes quite small.
④Lx oscillates very narrow pulses by the current limit for several ms.
⑤The circuit is latched, stopping its operation.
④
②
①
③
Delay
LX
ILIM
ILX
18/33
Limit >
# ms
mS
⑤
XC9235/XC9236/XC9237
Series
■NOTE ON USE (Continued)
14. In order to stabilize VIN’s voltage level and oscillation frequency, we recommend that a by-pass capacitor (CIN) be
connected as close as possible to the VIN & VSS pins.
15. High step-down ratio and very light load may lead an intermittent oscillation.
16. During PWM / PFM automatic switching mode, operating may become unstable at transition to continuous mode.
Please verify with actual parts.
17. Please note the inductance value of the coil. The IC may enter unstable operation if the combination of ambient
temperature, setting voltage, oscillation frequency, and L value are not adequate.
In the operation range close to the maximum duty cycle, The IC may happen to enter unstable output voltage operation
even if using the L values listed below.
<External Components>
●The Range of L Value
fOSC
VOUT
L Value
3.0MHz
0.8V＜VOUT<4.0V
1.0μH～2.2μH
VOUT≦2.5V
3.3μH～6.8μH
2.5V＜VOUT
4.7μH～6.8μH
1.2MHz
*When a coil less value of 4.7μH is used at
fOSC=1.2MHz or when a coil less value of 1.5μH is
used at fOSC=3.0MHz, peak coil current more easily
reach the current limit ILMI. In this case, it may
happen that the IC can not provide 600mA output
current.
18. It may happen to enter unstable operation when the IC operation mode goes into continuous operation mode under the
condition of small input-output voltage difference. Care must be taken with the actual design unit.
<External Components>
19/33
XC9235/XC9236/XC9237 Series
■NOTE ON USE (Continued)
●Instructions of pattern layouts
1. In order to stabilize VIN voltage level, we recommend that a by-pass capacitor (CIN) be connected as close as possible to
the VIN & VSS pins.
2. Please mount each external component as close to the IC as possible.
3. Wire external components as close to the IC as possible and use thick, short connecting traces to reduce the circuit
impedance.
4. Make sure that the PCB GND traces are as thick as possible, as variations in ground potential caused by high ground
currents at the time of switching may result in instability of the IC.
5. This series’ internal driver transistors bring on heat because of the output current and ON resistance of driver transistors.
XC9235/9236/9237A, B, C, E, G (Output Voltage Fixed)
CL
XC9235/9236/9237A, B, C (Output Voltage Fixed)
Inductor
Inductor
Inductor
Inductor
For the VIN, VOUT, VSS/CE, please put the wire.
For the VIN, VOUT, VSS/CE, please put the wire.
XC9235/9236/9237D, F (Output Voltage External Setting)
Chip
Chip
Resistance
Resistance
Inductor
Inductor
For the VIN, VOUT, VSS/CE, please put the wire.
20/33
XC9235/XC9236/XC9237
Series
■TEST CIRCUITS
< Circuit No.1 >
・A/B/C/E/G series
・D/F series
Wave Form Measure Point
A
VIN
Wave Form Measure Point
L
L
A
Lx
VIN
IOUT
Lx
Cfb
CIN
CE/MODE
VSS
CIN
VOUT
CL
V
R1
CL
CE/MODE
RL
VSS
FB
V
RL
R2
※ External Components
L
※ External Components
L
CIN
CL
R1
R2
Cfb
: 1.5uH(NR3015) 3.0MHz
4.7uH(NR4018) 1.2MHz
CIN : 4.7μF(ceramic)
CL :10μF(ceramic)
< Circuit No.2 >
: 1.5μH(NR4018) 3.0MHz
: 4.7μH (NR3015) 1.2MHz
: 4.7μF
: 10μF
: 150kΩ
: 300kΩ
: 120pF
VOUT=VFB×(R1+R2)/R2
< Circuit No.3 >
Wave Form Measure Point
A
1uF
VIN
CE/MODE
VSS
Lx
VIN
VOUT
(FB)
CE/MODE
VSS
1uF
Lx
VOUT
(FB)
Rpulldown
200Ω
< Circuit No.5 >
< Circuit No.4 >
VIN
Lx
VIN
Lx
A
ICEH
1uF
CE/MODE
VSS
VOUT
(FB)
V
100mA
A
1uF
CE/MODE
VSS
VOUT
(FB)
ICEL
ON resistance = (VIN-VLx)/100mA
< Circuit No.7 >
< Circuit No.6 >
Wave Form Measure Point
Wave Form Measure Point
VIN
1uF
CE/MODE
VSS
VIN
Lx
VOUT
(FB)
V
ILIM
1uF
CE/MODE
VSS
Lx
VOUT
(FB)
Ilat
Rpulldown
1Ω
< Circuit No.8 >
ILx
VIN
1uF
CE/MODE
VSS
Lx
VOUT
(FB)
A
< Circuit No.9 >
A
CIN
VIN
CE/MODE
VSS
Lx
VOUT
(FB)
21/33
XC9235/XC9236/XC9237 Series
■TYPICAL PERFORMANCE CHARACTERISTICS
(1) Efficiency vs. Output Current
XC9237A18C
L=4.7μH (NR4018), CIN=4.7μF, CL=10μF
XC9237A18D
L=1.5μH (NR3015), CIN=4.7μF, CL=10μF
PWM/PFM Automatic Sw itching Control
100
100
90
80
80
VIN= 4.2V
70
60
PWM Control
VIN= 4.2V
3.6V
2.4V
3.6V
50
Efficiency:
EFFI (%)
Efficency:EFFI(%)
Efficiency: EFFI (%)
Efficency:EFFI(%)
PWM/PFM Automatic Sw itching Control
90
2.4V
40
30
70
VIN= 4.2V
60
3.6V
50
PWM Control
VIN= 4.2V
3.6V
2.4V
2.4V
40
30
20
20
10
10
0
0
0.1
1 Output Current:
10 IOUT (mA) 100
0.1
1000
1Output Current:
10IOUT (mA) 100
1000
Output Current:IOUT(mA)
Output Current:IOUT(mA)
(2) Output Voltage vs. Output Current
XC9237A18D
L=1.5μH (NR3015), CIN=4.7μF, CL=10μF
2.1
2.1
2.0
2.0
Output Voltage:Vout(V)
Output
Voltage:Vout(V)
Output Voltage:
VOUT (V)
XC9237A18C
L=4.7μH (NR4018), CIN=4.7μF, CL=10μF
PWM/PFM Automatic Sw itching Control
VIN＝4.2V,3.6V,2.4V
1.9
1.8
1.7
PWM Control
1.6
PWM/PFM Automatic Sw itching Control
VIN＝4.2V,3.6V,2.4V
1.9
1.8
1.7
PWM Control
1.6
1.5
1.5
0.1
1
10
100
1000
0.1
Output Current: IOUT (mA)
1
10
100
1000
Output Current: IOUT (mA)
Output Current:IOUT(mA)
Output Current:IOUT(mA)
(3) Ripple Voltage vs. Output Current
XC9237A18D
L=1.5μH (NR3015), CIN=4.7μF, CL=10μF
XC9237A18C
L=4.7μH (NR4018), CIN=4.7μF, CL=10μF
100
100
80
60
PWM/PFM Automatic
Sw itching Control
VIN＝4.2V
3.6V
2.4V
PWM Control
VIN＝4.2V,3.6V,2.4V
40
Ripple
Voltage:
Vr (mV)
Ripple
Voltage:Vr(mV)
Ripple
Voltage:
Vr (mV)
Ripple
Voltage:Vr(mV)
80
20
0
PWM/PFM Automatic
PWM Control
VIN＝4.2V,3.6V,2.4V Sw itching Control
VIN＝4.2V
3.6V
2.4V
40
20
0
0.1
1
10
100
Output
IOUT (mA)
OutputCurrent:
Current:IOUT(mA)
22/33
60
1000
0.1
1
10
100
Output
IOUT (mA)
OutputCurrent:
Current:IOUT(mA)
1000
XC9235/XC9236/XC9237
Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(4) Oscillation Frequency vs. Ambient Temperature
XC9237A18D
L=1.5μH (NR3015), CIN=4.7μF, CL=10μF
XC9237A18C
L=4.7μH (NR4018), CIN=4.7μF, CL=10μF
3.5
Oscillation Frequency
Frequency: FOSC
(MHz)
Oscillation
: FOSC(MHz)
Oscillation Frequency:
(MHz)
Oscillation
FrequencyFOSC
: FOSC(MHz)
1.5
1.4
1.3
VIN=3.6V
1.2
1.1
1.0
0.9
0.8
3.4
3.3
3.2
VIN=3.6V
3.1
3.0
2.9
2.8
2.7
2.6
2.5
-50
-25
0
25
50
75
100
-50
-25
Ambient
Ta(℃)
( ℃)
AmbientTemperature:
Temperature: Ta
0
25
50
75
100
Ambient
( ℃)
Ambient Temperature:
Temperature: TaTa
(℃)
(5) Supply Current vs. Ambient Temperature
XC9237A18D
40
40
35
35
30
VIN=6.0V
25
20
SupplyCurrent:
CurrentIDD
: IDD
(μA)
Supply
(μA)
Supply Current:
(μA)
Supply
CurrentIDD
: IDD
(μA)
XC9237A18C
VIN=4.0V
VIN=2.0V
15
10
5
0
-50
30
VIN=6.0V
VIN=4.0V
VIN=2.0V
25
20
15
10
5
-25
0
25
50
75
0
-50
100
-25
Ambient Temperature:
Temperature: TaTa
(℃)
Ambient
( ℃)
0
25
50
75
100
Ambient Temperature:
Temperature: TaTa
(℃)
Ambient
( ℃)
(6) Output Voltage vs. Ambient Temperature
(7) UVLO Voltage vs. Ambient Temperature
XC9237A18D
XC9237A18D
2.1
1.8
2.0
1.5
1.9
UVLOVoltage
Voltage:: UVLO
UVLO
UVLO(V)
(V)
Output
VOUT(V)(V)
OutputVoltage
Voltage::VOUT
CE=VIN
VIN=3.6V
1.8
1.7
1.6
1.5
1.2
0.9
0.6
0.3
0.0
-50
-25
0
25
50
Ambient
( ℃)
Ambient Temperature:
Temperature: TaTa
(℃)
75
100
-50
-25
0
25
50
75
100
Ambient
( ℃)
Ambient Temperature:
Temperature: TaTa
(℃)
23/33
XC9235/XC9236/XC9237 Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(8) CE "H" Voltage vs. Ambient Temperature
(9) CE "L" Voltage vs. Ambient Temperature
XC9237A18D
1.0
1.0
0.9
0.9
0.8
0.8
0.7
CE"L"
“L” Voltage
Voltage: VCEL
(V)(V)
CE
: VCEL
CE “H” Voltage: VCEH (V)
CE "H" Voltage : VCEH (V)
XC9237A18D
VIN=5.0V
0.6
0.5
0.4
0.3
VIN=2.4V
0.2
VIN=3.6V
0.1
VIN=5.0V
0.7
0.6
0.5
0.4
VIN=3.6V
0.3
VIN=2.4V
0.2
0.1
0.0
0.0
-50
-25
0
25
50
75
100
-50
-25
Ambient
Ta(℃)
( ℃)
AmbientTemperature:
Temperature: Ta
0
25
50
75
100
Ambient
Temperature:TaTa
( ℃)
Ambient Temperature:
(℃)
(10) Soft Start Time vs. Ambient Temperature
XC9237A18D
L=1.5μH (NR3015), CIN=4.7μF, CL=10μF
5
5
4
4
SoftStart
Start Time
Time: TSS
(ms)
Soft
: TSS
(ms)
Soft
TimeTSS
: TSS
(ms)
Soft Start
Start Time:
(ms)
XC9237A18C
L=4.7μH (NR4018), CIN=4.7μF, CL=10μF
3
2
VIN=3.6V
1
0
-50
-25
0
25
50
75
100
Ambient Temperature:
Temperature: TaTa
(℃)
Ambient
( ℃)
Lx
Resistance:
RLxH, RLxL (Ω) (Ω)
LxSW
SWON
ON
Resistance:RLxH,RLxL
XC9237A18D
1.0
0.9
0.8
Nch on Resistance
0.6
0.5
0.4
0.3
Pch on Resistance
0.2
0.1
0.0
0
1
2
3
4
Input
VIN(V)
(V)
InputVoltage
Voltage: :VIN
24/33
2
VIN=3.6V
1
0
-50
-25
0
25
50
Ambient Temperature:
(℃)
Ambient
Temperature:TaTa
( ℃)
(11) "Pch / Nch" Driver on Resistance vs. Input Voltage
0.7
3
5
6
75
100
XC9235/XC9236/XC9237
Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(12) XC9235B/36B/37B Rise Wave Form
XC9237B12C
L=4.7μH (NR4018), CIN=4.7μF, CL=10μF
XC9237B33D
L=1.5μH (NR3015), CIN=4.7μF, CL=10μF
VIN=5.0V
VIN=5.0V
IOUT=1.0mA
IOUT=1.0mA
VOUT：1.0V/div
VOUT：0.5V/div
CE：0.0V⇒1.0V
CE：0.0V⇒1.0V
100μs/div
(13) XC9235B/36B/37B
100μs/div
Soft-Start Time vs. Ambient Temperature
XC9237B12C
XC9237B33D
L=1.5μH(NR3015), CIN=4.7μF, CL=10μF
500
500
400
400
Soft Start Time :TSS (μs)
Soft Start Time :TSS (μs)
L=4.7μH(NR4018), CIN=4.7μF, CL=10μF
300
200
VIN=5.0V
IOUT=1.0mA
100
300
200
VIN=5.0V
IOUT=1.0mA
100
0
0
-50
-25
0
25
50
75
100
-50
0
25
50
75
100
Ambient Temperature: Ta(℃)
Ambient Temperature: Ta(℃)
(14) XC9235B/36B/37B
-25
CL Discharge Resistance vs. Ambient Temperature
XC9237B33D
600
CL Discharge Resistance: (Ω)
VIN=6.0V
500
VIN=4.0V
VIN=2.0V
400
300
200
100
-50
-25
0
25
50
75
100
Ambient Temperature: Ta (℃)
25/33
XC9235/XC9236/XC9237 Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(15) Load Transient Response
XC9237A18C
L=4.7μH (NR4018), CIN=4.7μF (ceramic), CL=10μF (ceramic), Topr=25℃
VIN=3.6V, VCE=VIN (PWM/PFM Automatic Switching Control)
IOUT=1mA → 100mA
IOUT=1mA → 300mA
1ch: IOUT
1ch: IOUT
2ch
2ch
VOUT: 50mV/div
VOUT: 50mV/div
50μs/div
50μs/div
IOUT=100mA → 1mA
IOUT=300mA → 1mA
1ch: IOUT
1ch: IOUT
2ch
2ch
VOUT: 50mV/div
VOUT: 50mV/div
200μs/div
26/33
200μs/div
XC9235/XC9236/XC9237
Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(15) Load Transient Response (Continued)
XC9237A18C
L=4.7μH (NR4018), CIN=4.7μF (ceramic), CL=10μF (ceramic), Topr=25℃
VIN=3.6V, VCE=1.8V (PWM Control)
IOUT=1mA → 100mA
IOUT=1mA → 300mA
1ch: IOUT
1ch: IOUT
2ch
2ch
VOUT: 50mV/div
VOUT: 50mV/div
50μs/div
50μs/div
IOUT=100mA → 1mA
IOUT=300mA → 1mA
1ch: IOUT
1ch: IOUT
2ch
2ch
VOUT: 50mV/div
VOUT: 50mV/div
200μs/div
200μs/div
27/33
XC9235/XC9236/XC9237 Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(15) Load Transient Response (Continued)
XC9237A18D
L=1.5μH (NR3015), CIN=4.7μF (ceramic), CL=10μF (ceramic), Topr=25℃
VIN=3.6V, VCE=VIN (PWM/PFM Automatic Switching Control)
IOUT=1mA → 100mA
IOUT=1mA → 300mA
1ch: IOUT
1ch: IOUT
2ch
2ch
VOUT: 50mV/div
VOUT: 50mV/div
50μs/div
50μs/div
IOUT=100mA → 1mA
IOUT=300mA → 1mA
1ch: IOUT
1ch: IOUT
2ch
2ch
VOUT: 50mV/div
VOUT: 50mV/div
200μs/div
28/33
200μs/div
XC9235/XC9236/XC9237
Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(15) Load Transient Response (Continued)
XC9237A18D
L=1.5μH (NR3015), CIN=4.7μF (ceramic), CL=10μF (ceramic), Topr=25℃
VIN=3.6V, VCE=1.8V (PWM Control)
IOUT=1mA → 100mA
IOUT=1mA → 300mA
1ch: IOUT
1ch: IOUT
2ch
2ch
VOUT: 50mV/div
VOUT: 50mV/div
50μs/div
50μs/div
IOUT=100mA → 1mA
IOUT=300mA → 1mA
1ch: IOUT
1ch: IOUT
2ch
2ch
VOUT: 50mV/div
VOUT: 50mV/div
200μs/div
200μs/div
29/33
XC9235/XC9236/XC9237 Series
■PACKAGING INFORMATION
●SOT-25
●USP-6C
●USP-6C Reference Pattern Layout
●USP-6C Reference Metal Mask Design
2.4
0.45
0.45
1
6
2
5
3
4
0.05
0.05
1.0
30/33
XC9235/XC9236/XC9237
Series
■PACKAGING INFORMATION (Continued)
●USP-6EL
* A part of the pin may appear from the side of the package because of it’s
structure, but reliability of the package and strength will not be changed below the
standard.
●USP-6EL Reference Pattern Layout
●USP-6EL Reference Metal Mask Design
1.4
1.5
0.3
0.35
2.2
0.9
2.25
0.3
0.375
1.1
0.3
0.375
0.5
0.55
0.55
0.55
0.55
31/33
XC9235/XC9236/XC9237 Series
■MARKING RULE
●SOT-25, USP-6C, USP-6EL
① represent product series
PRODUCT
XC9235
SERIES
A
B
C
D
E
F
G
SOT-25
(TOP VIEW)
① ② ③
④ ⑤
USP-6C/USP-6EL
USP-6C/USP-6EL
(Top View)
(TOP VIEW)
4
C
K
K
4
2
C
XC9236
XC9237
5
D
L
L
5
7
D
6
E
M
M
6
B
E
② represents integer number of output voltage and oscillation frequency
●A/B/C/F Series
OUTPUT
MARK
VOLTAGE (V)
fOSC=1.2MHz
fOSC=3.0MHz
0.X
1.X
2.X
3.X
4.X
●E/G/D Series
OUTPUT
VOLTAGE (V)
0.X
1.X
2.X
3.X
4.X
A
B
C
D
E
F
H
K
L
M
MARK
fOSC=1.2MlHz
fOSC=3.0MlHz
N
P
R
S
T
U
V
X
Y
Z
③ represents decimal point of output voltage
VOUT (V)
MARK
VOUT (V)
X.00
X.10
X.20
X.30
X.40
X.50
X.60
X.70
X.80
X.90
0
1
2
3
4
5
6
7
8
9
X.05
X.15
X.25
X.35
X.45
X.55
X.65
X.75
X.85
X.95
MARK
A
B
C
D
E
F
H
K
L
M
④⑤ represents production lot number
Order of 01, …09, 10, 11, …99, 0A, …0Z, 1A, …9Z, A0, …Z9, AA, …ZZ.
(G, I, J, O, Q, W excluded)
*No character inversion used.
32/33
XC9235/XC9236/XC9237
Series
1. The products and product specifications contained herein are subject to change without
notice to improve performance characteristics.
Consult us, or our representatives
before use, to confirm that the information in this datasheet is up to date.
2. We assume no responsibility for any infringement of patents, patent rights, or other
rights arising from the use of any information and circuitry in this datasheet.
3. Please ensure suitable shipping controls (including fail-safe designs and aging
protection) are in force for equipment employing products listed in this datasheet.
4. The products in this datasheet are not developed, designed, or approved for use with
such equipment whose failure of malfunction can be reasonably expected to directly
endanger the life of, or cause significant injury to, the user.
(e.g. Atomic energy; aerospace; transport; combustion and associated safety
equipment thereof.)
5. Please use the products listed in this datasheet within the specified ranges.
Should you wish to use the products under conditions exceeding the specifications,
please consult us or our representatives.
6. We assume no responsibility for damage or loss due to abnormal use.
7. All rights reserved. No part of this datasheet may be copied or reproduced without the
prior permission of TOREX SEMICONDUCTOR LTD.
33/33