Series
PWM, PWM/PFM Switching Step-Up & Down DC/DC Converter Controller ICs
◆Input Voltage Range : 2.0V ~10.0V
■Applications
◆Output Voltage Range : 2.4V ~ 6.0V (±2.5% accuracy)
●Mobile phones
◆Oscillation Frequency Range
●PDAs
: 180kHz, 300kHz (±15% accuracy)
◆Maximum Duty Ratio : 85% (typ)
◆PWM/PFM Switching Step-Up & Down Control (XC9302)
◆Efficiency
●Palmtop computers
●Portable audio equipment
●Various power supplies
: 81% (typ) 5.0V , 78% (typ) 3.3V
◆SOT-25 Package
6
■General Description
■Features
The XC9301/02 series are step-up/down DC/DC converter controller ICs
with fast, low ON resistance drivers built-in. A versatile, large output
current, step-up/down DC/DC converter can be realised using only 4
basic external components - transistors, coils, diodes and capacitors.
Output voltage is selectable in 0.1V steps within a 2.4V ~ 6.0V ( ± 2.5%
accuracy) range and switching frequency is set at 180kHz or 300KHz.
The XC9302 series switches from PWM to PFM control during light loads
and the series offers high efficiencies from light loads through to large
output currents.
Soft-start time is internally set to 10 msec which offers protection against
rush currents when the power is switched on and also against voltage
Input Voltage Range : 2.0V ~ 10V
Output Voltage Range : 2.4V ~ 6.0V ( ± 2.5% accuracy)
(selectable in 0.1V steps)
Oscillation Frequency : 180KHz, 300KHz ( ± 15% accuracy)
Output Current
: more than 250mA (VIN=2.4V,
VOUT=3.3V)
: 81% (typ) at 5.0V, 78% (typ) at 3.3V
: ISTB = 0.5µA (max)
Efficiency
Stand-By
Output Voltage Internal Set-Up
SOT-25 Package
overshoot.
During shutdown (CE pin = L), consumption current can be reduced to
as little as 0.5µA or less.
■Typical Application Circuit
NSW
PSW
VIN
Efficiency:EFFI （%）
VOUT
SD2
■Typical Performance Characteristic
100
L
SD1
80
60
V IN=2V
40
4V
20
6V
CL
CIN
CE
0
0. 1
1
10
100
1000
Output Current:IOUT（mA）
597
XC9301/9302
Series
■Pin Configuration
5
■Pin Assignment
4
1
3
2
PIN NUMBER
PIN NAME
1
GND
Ground
2
VDD
Power Supply
3
EXT/
External Tr. Drive
4
VOUT
Output Voltage Monitor
5
CE
Chip Enable
SOT-25
■Product Classification
●Ordering Information
ＸＣ９３０１
XC9301 Series PWM control
6
DESIGNATOR SYMBOL
DESCRIPTION
A
Standard (5-pin)
Output Voltage
e.g. VOUT=3.0V→w=3, e=0, VOUT=5.3V→w=5, e=3
Oscillation Frequency:
2
180kHz
300kHz
3
Package:
SOT-25
M
R
Embossed Tape:
Standard
L
Reverse
ＸＣ９３０２
XC9302 Series PWM/PFM switching control（same as XC9302 Series）
■Packaging Information
●SOT-25
+0.1
0.15 -0.05
0.4
+0.1
-0.05
+0.2
-0.1
0.2min
1.6
2.8±0.2
0∼0.1
（0.95）
1.9±0.2
2.9±0.2
598
1.1±0.1
FUNCTION
XC9301/9302
Series
■Marking
q Represents the Product Classification
qwer
SOT-25
(TOP VIEW)
DESIGNATOR
PRODUCT NAME
A
XC9301A＊＊＊M＊
K
XC9302A＊＊＊M＊
w Represents the integer of the Output Voltage and Oscillation Frequency
OUTPUT
VOLTAGE（V）
DESIGNATOR
FREQUENCY=180kHz
FREQUENCY=300kHz
（XC9301/XC9302A＊＊2M＊） （XC9301/XC9302A＊＊3M＊）
2.X
2
2
3.X
4.X
3
4
3
4
5.X
5
5
6.X
6
6
e Represents the decimal number of the Output Voltage and Oscillation Frequency
DESIGNATOR
OUTPUT
VOLTAGE（V）
FREQUENCY=180kHz
FREQUENCY=300kHz
（XC9301/XC9302A＊＊2M＊） （XC9301/XC9302A＊＊3M＊）
X.1
0
1
A
B
X.2
X.3
2
3
C
D
X.4
X.5
X.6
X.7
4
E
X.8
X.0
X.9
5
F
6
7
H
K
8
9
L
M
6
r Denotes the production lot number
0 to 9, A to Z repeated(G.I.J.O.Q.W excepted)
599
XC9301/9302
Series
■Block Diagram
VOUT
Error Amp.
VDD
Phase
Compensation
+
+
-
EXT/
Buffer,
Driver
-
PWM
Comparator
CE
6
600
Vref with
Soft Start,
CE
GND
Ramp Wave
Generator,
OSC
PWM/PFM
Controller
■Absolute Maximum Ratings
Ta = 25℃
PARAMETER
SYMBOL
RATINGS
UNITS
VDD Pin Voltage
VDD
-0.3∼12
V
VOUT Pin Voltage
VOUT
-0.3∼12
V
CE Pin Voltage
VCE
-0.3∼12
V
EXT / Pin Voltage
VEXT/
-0.3∼VDD+0.3
V
EXT / Pin Current
I EXT/
±100
mA
Power Dissipation
Pd
150
mW
Operating Ambient Temp.
Topr
-40∼+85
℃
Storage Temp.
Tstg
-40∼+125
℃
XC9301/9302
Series
■Electrical Characteristics
XC9301x332MR,XC9302x332MR
(VOUT=3.3V, FOSC=180kHz)
Ta=25℃
MIN.
TYP.
MAX.
UNITS
VOUT
3.218
3.300
3.383
V
Supply Voltage
VDD
2.0
ｰ
10.0
V
Supply Current 1
IDD1
VOUT=CE: Set Output Voltage × 0.95 applied
ｰ
80
140
μA
μA
PARAMETER
SYMBOL
Output Voltage
CONDITIONS
Supply Current 2
IDD2
VOUT=CE: Set Output Voltage + 0.5 applied
ｰ
15
26
Stand-By Current
ISTB
VOUT: Set Output Voltage × 0.95 applied, CE=0V
ｰ
ｰ
0.5
μA
Oscillation Frequency
FOSC
VDD=VOUT=CE: Set Output Voltage × 0.95 applied
153
180
207
KHz
MAXDTY VDD=VOUT=CE: Set Output Voltage × 0.95 applied
78
85
92
%
PFMDTY No Load
15
25
35
%
ｰ
78
ｰ
%
5.0
10.0
20.0
mS
V
Max. Duty Ratio
PFM Duty RatioNote1
EfficiencyNote2
EFFI
Soft-Start Time
TSS
CE 'H' Voltage
VCEH
VOUT: Set Output Voltage × 0.95 applied
0.65
ｰ
ｰ
CE 'L' Voltage
VCEL
VOUT: Set Output Voltage × 0.95 applied
ｰ
ｰ
0.20
V
EXT/ 'H' ON Resistance
REXTBH
Same as IDD1, VEXT/ = VOUT - 0.4V
ｰ
29
43
Ω
EXT/ 'L' ON Resistance
REXTBL
Same as IDD1, VEXT/ = 0.4V
ｰ
19
27
Ω
MIN.
TYP.
MAX.
UNITS
V
VDD=VIN=CE: Set Output Voltage × 0.95 applied
Measuring Conditions : Unless otherwise stated, VDD = 3.3V, IOUT = 130mA
Note: 1. XC9302 series only
2. EFFI={[(Output Voltage) × (Output Current)] ÷ [(Input Voltage) × (Input Current)]} × 100
XC9301x333MR, XC9302x333MR
PARAMETER
(VOUT=3.3V, FOSC=300kHz)
SYMBOL
CONDITIONS
Ta=25℃
Output Voltage
VOUT
3.218
3.300
3.383
Supply Voltage
VDD
2.0
ｰ
10.0
V
Supply Current 1
IDD1
VOUT=CE: Set Output Voltage × 0.95 applied
ｰ
130
200
μA
μA
Supply Current 2
IDD2
VOUT=CE: Set Output Voltage + 0.5 applied
ｰ
20
35
Stand-By Current
ISTB
VOUT: Set Output Voltage x 0.95 applied, CE=0V
ｰ
ｰ
0.5
μA
Oscillation Frequency
FOSC
VDD=VOUT=CE: Set Output Voltage × 0.95 applied
255
300
345
KHz
MAXDTY VDD=VOUT=CE: Set Output Voltage × 0.95 applied
78
85
92
%
PFMDTY No Load
15
25
35
%
ｰ
78
ｰ
%
5.0
10.0
20.0
mS
V
Max. Duty Ratio
PFM Duty RatioNote1
EfficiencyNote2
EFFI
Soft-Start Time
TSS
CE 'H' Voltage
VCEH
VOUT: Set Output Voltage × 0.95 applied
0.65
ｰ
ｰ
CE 'L' Voltage
VCEL
VOUT: Set Output Voltage × 0.95 applied
ｰ
ｰ
0.20
V
EXT/ 'H' ON Resistance REXTBH
Same as IDD1, VEXT/ = VOUT - 0.4V
ｰ
29
43
Ω
EXT/ 'L' ON Resistance REXTBL
Same as IDD1, VEXT/ = 0.4V
ｰ
19
27
Ω
VDD=VIN=CE: Set Output Voltage × 0.95 applied
6
Measuring Conditions : Unless otherwise stated, VDD = 3.3V, IOUT = 130mA
Note: 1. XC9302 series only
2. EFFI={[(Output Voltage) × (Output Current)] ÷ [(Input Voltage) × (Input Current)]} × 100
■Typical Application Circuit
●Circuit Connection Example
VOUT
L
SD2
NSW
PSW
VIN
External Components
PSW : XP162A12 ( SOT-89 pkg, Torex )
NSW : XP161A12 ( SOT-89 pkg, Torex )
L
: 22μH ( Sumida CR54 )
SD1
SD
CL
CIN
CL
CIN
: U2FWJ44N ( Schottky, Toshiba )
: 16V, 47μF × 2 ( Tantalum, Nichicon MCE )
: 16V, 22μF ( Tantalum, Nichicon MCE )
220μF (Nichicon, PJ)
CE
601
XC9301/9302
Series
■Operational Explanation
＜Block Diagram＞
＜Circuit Connection Example＞
L
VOUT
PSW
SD2
Error Amp.
SD1
NSW
VOUT
CL
VOUT
VIN
CE
CE
VDD
Phase
Compensation
+
GND
+
-
EXT
VIN
-
Buffer,
Driver
EXT/
PWM
Comparator
CIN
CE
Vref with
Soft Start,
CE
PWM/PFM
Controller
Ramp Wave
Generator,
OSC
GND
The XC9301/9302 series are PWM (PWM/PFM switching) step-up/down DC/DC converter controller ICs. The XC9302 series switches to PFM
operations during light loads and is very efficient over a wide range in relation to load. Further, the efficiency can be maintained over a wide
input voltage range as both step-up & step-down operations are PWM controlled. Output voltage settings are laser trimmed.
6
[ON TIME]
P-Ch MOSFET (PSW) = ON, N-Ch MOSFET (NSW) = ON : Current flows from VIN via PSW, L, NSW, to GND : L is charged.
[OFF TIME]
P-Ch MOSFET (PSW) = OFF, N-Ch MOSFET (NSW) = OFF : Current flows from GND via SD1, L, SD2, to VOUT : VOUT rises due to the charge
stored at L.
By comparing VOUT with the internal reference voltage, the ON TIME vs OFF TIME ratio can be regulated & output stability can be protected.
■Block Diagram Explanation
<Error Amp.>
The error amplifier is used as an output voltage monitor. It compares the reference voltage with the feedback from the voltage divided by the
internal resistor. Should a voltage higher than the reference voltage be fedback, the output of the error amp will increase.
<PWM Comparator>
The PWM comparator compares the output of the error amp with the ramp wave. When the voltage at the output of the error amp is low, the
EXT/ pin will be LOW level (Switching ON time).
<Ramp Wave Generator>
The ramp wave generator, as the name suggests, generates the switching frequency's ramp wave.
<PWM / PFM Controller>
With the XC9302 series, control is automatically switched between PWM and PFM according to the size of the load.
<Vref with Soft Start, CE>
The start up of the Vref voltage at the error amp's input is gradual due to the internal capacitor and low current circuit. Because of this soft-start
function, the operations of the error amp's 2 inputs are balanced and the EXT/ pin's ON time can be manipulated to produce longer ON times.
Further, with the UVLO function, the signal will be such so as not to turn the MOS switch ON until any instability in the internal circuit stabilizes
during soft-start time. Even in cases where input voltage is so low as to produce instability in the IC, the UVLO function will operate and the
MOS switch will be turned OFF.
602
XC9301/9302
Series
●Product Selection (Notes)
XC9301/02 series is a group of PFM controlled (XC9302 series switches from PWM to PFM control during light loads) step-up and down DC/DC
converters. The series is highly efficient with a wide range of input voltage since its stepping-up and down operation is controlled by PWM
movements. In general, there are several methods available for obtaining a stable output voltage at such times when input voltage is changing
from being higher than the established output voltage to being lower than the established output voltage. Each method has its merits and
demerits but is essential that a method which provides the best results in terms of input & output under actual operating conditions. Below, two
methods are highlighted and their respective performances in terms of efficiency are compared.
This is an efficiency comparison of two ways, step-up DC/DC converter + VR and step-up & down DC/DC converter.
[Step-up DC/DC Converter + VR] (XC6361/62)
◆ Step-up mode (Input voltage < set output voltage + 0.4V)
After input voltage has been stepped-up to set output voltage + 0.4V by the step-up DC/DC converter, the output voltage will be regulated to
the set value by the VR. (0.4V loss via the VR)
◆ Step-down mode (Input voltage > set output voltage + 0.4V)
After input voltage has been stepped-up to set output voltage + 0.4V by the step-up DC/DC converter, the output voltage will be regulated to
the set value by the VR. (Input/Output voltage difference loss via the VR)
[Step-up&down DC/DC Converter] (XC9301/02)
◆ Set ouput voltage obtained as a result of the automatic switching operations of the IC regardless of the difference between input voltage and
set output voltage.
Efficiency［%］
Input Voltage vs. Efficiency
6
XC6361(STEP-UP DCDC+VR)
90
85
80
75
70
65
60
55
50
45
40
IOUT=10mA 100mA 200mA
XC9301(STEP-UP/DOWN DCDC
IOUT=10mA 100mA 200mA
Set Output Voltage+0.4V
Step-Up Mode
2
Step-Down Mode
3
4
5
6
7
8
Input Voltage［V］
The above graph shows that over a wide input voltage range, the efficiency of the XC9301/02 is more or less constant. On the other hand, the
efficiency of the XC6361/62 is clearly shown to decrease as input voltage increases. In step-down mode in particular, the efficiency of the
XC9301/02 is much better than the XC6361/62. In applications that use either a standard dry 3 cell battery or a 2 cell lithium Ion battery to
obtain an output of 3.3V, for example, the efficiency of the XC9301/02 series is again much better. Because the XC9301/02 series does not
have a series regulator output, we recommend a test with samples for use in applications where ripple voltage is a problem.
●External Components Selection (Notes)
●The performance of the DC/DC converter IC circuit is heavily reliant upon the performance of the surrounding circuitry and components. In
particular, since the VF voltage of the Schottky Diode used will have a direct effect upon efficiency, the smaller the diode, the better the
efficiency obtainable. (Refer to the graph below)
●It is also recommended that a switching MOSFET with a small ON resistance be used. With the XC9301/02, an ON resistance of 500mΩ or
less is recommended.
VOUT=3.3V, IOUT=100mA
Efficiency［%］
85
80
VIN=2.4V
VIN=3.0V
75
VIN=4.5V
70
65
0.2
0.4
VF Voltage［V］
603
XC9301/9302
Series
●Demo Board ver. 1.1
External Components
PSW ： XP162A12(SOT-89)
NSW ： XP161A12(SOT-89)
6
Demo Board Connection Layout
→ suitable for SOT-23, SOT-89, CPH-6
L
： 22μH (SUMIDA CR54)
→ suitable for CR43∼CR105
SD
： U2FWJ44N (Schottky, Toshiba)
→ suitable for MA720, MA735, U2FWJ44N
C L ： 16V 47μF×2 (Tantalum, Nichicon MCE)
C IN ： 16V 22μF (Tantalum, Nichicon MCE)
16V 220μF (Electrolytic, PJ type)
→ suitable for 1005 type∼D2 Package
<Jumper Settings>
JP3 : Must be connected
JP2 : To be connected if using SW (CE pin fixed to VIN)
* Use tinned copper wire for VIN pin, VOUT pin, GND pin, JP2, and JP3.
* Connect test pins for TP1, TP2, TP3, and CE.
Note:
VIN
Oscillation may occur as a result of input voltage instability when the
output current is large. At such times, we recommend that in place
of the 220µF PJ type capacitor, you connect R1 & C1 as shown in
the diagram below.
(In case of demo boards ver. 1.1, cut the pattern wire of R1
connecting point, then connect R1.)
R1(around 10Ω)
C1
(tantalum around 10μF)
GND
604
XC9301/9302
Series
■Typical Performance Characteristics
XC9302A332 (PWM/PFM switching control, 180kHz, VOUT=3.3V)
(1) OUTPUT VOLTAGE vs. OUTPUT CURRENT (Topr=25°C)
Output Voltage:VOUT（V）
3.40
4.5V
3.35
3.30
3.25
VIN =2.4V
3.0V
3.20
0.1
1
10
100
1000
Output Current:IOUT（mA）
(2) EFFICIENCY vs. OUTPUT CURRENT (Topr=25°C)
100
4.5V
6
Efficiency:EFFI （%）
80
60
40
V IN=2.4V
20
3.0V
0
0.1
1
10
100
1000
Output Current:IOUT（mA）
(3) RIPPLE VOLTAGE vs. OUTPUT CURRENT (Topr=25°C)
200
Ripple Voltage:Vr（mV）
3.0V
150
V IN=2.4V
100
50
4.5V
0
0.1
1
10
100
1000
Output Current:IOUT（mA）
External Components
PSW : XP162A12A6PR
CL
: 47µF (Tantalum MCE) ×2
NSW : XP161A1265PR
CIN
: 220µF (Electrolytic PJ type)
SD
: U2FWJ44N×2
RDD
: 10Ω
L
: 22µH (CR54)
CDD
: 47µF (Tantalum MCE)
VCE=VIN
605
XC9301/9302
Series
(4) LOAD TRANSIENT RESPONSE (Topr=25°C)
VIN=3.0V
VOUT
IOUT
100mA
0.1mA
VIN=3.0V
6
VOUT
100mA
IOUT
0.1mA
External Components
PSW : XP162A12A6PR
CL
: 47µF (Tantalum F93) ×2
NSW : XP161A1265PR
CIN
: 220µF (Al. Electrolytic PJ type)
SD
: U2FWJ44N ×2
RDD
: 10Ω
L
: 22µH (CR54)
CDD
: 22µF (Tantalum)
VCE=VIN
606
XC9301/9302
Series
XC9302A502 (PWM/PFM switching control, 180kHz, VOUT=5.0V)
(1) OUTPUT VOLTAGE vs. OUTPUT CURRENT (Topr=25°C)
Output Voltage:VOUT（V）
5.10
5.05
6V
5.00
4.95
V IN=2V
4V
4.90
0.1
1
10
100
1000
Output Current:IOUT（mA）
(2) EFFICIENCY vs. OUTPUT CURRENT (Topr=25°C)
100
6
Efficiency:EFFI （%）
80
60
V IN=2V
40
4V
20
6V
0
0. 1
1
10
100
1000
Output Current:IOUT（mA）
(3) RIPPLE VOLTAGE vs. OUTPUT CURRENT (Topr=25°C)
200
Ripple Voltage:Vr（mV）
4V
150
V IN=2V
100
50
6V
0
0. 1
1
10
100
1000
Output Curren:IOUT（mA）
External Components
PSW : XP162A12A6PR
CL
: 47µF (Tantalum MCE) ×2
NSW : XP161A1265PR
CIN
: 220µF (Electrolytic PJ type)
SD
: U2FWJ44N ×2
RDD
: 10Ω
L
: 22µH (CR54)
CDD
: 47µF (Tantalum MCE)
VCE=VIN
607
XC9301/9302
Series
(4) LOAD TRANSIENT RESPONSE (Topr=25°C)
VIN=4.0V
VOUT
IOUT
100mA
0.1mA
6
VIN=4.0V
VOUT
100mA
IOUT
0.1mA
External Components
PSW : XP162A12A6PR
CL
: 47µF (Tantalum F93) ×2
NSW : XP161A1265PR
CIN
: 220µF (Electrolytic PJ type)
SD
: U2FWJ44N
RDD
: 10Ω
L
: 22µH (CR54)
CDD
: 47µF (Tantalum)
VCE=VIN
608