IXD3270/1
30V Input Voltage Step-Down DC/DC Converter
The bootstrap architecture to drive gate of the
internal N-channel transistor allows create a stable,
high-efficiency power supply with the output current
up to 2.0 A. IC allows use of low ESR ceramic
capacitors as load capacitors (CL).
An internal 0.8 V reference voltage allows set output
voltage using external resistive divider (RFB1, RFB2)
from 1.2 V to 12 V.
The IXD3270/1 allows select switching frequency at
300 or 500 kHz. External clock within ± 25% of the
internal one, applied to the SYNC pin, can be used to
synchronize controllers and reduce system noise.
The IXD3270/1 automatically change mode from
PFM at light load to PWM at heavy load to achieve
high efficiency over the full load range.
The soft start time is programmable by an external
capacitor connected to the SS pin.
The built-in under-voltage lockout (UVLO) function
forces switching transistor OFF, when input voltage is
2.5 V or lower.
Internal protection circuits include over-current
protection; short-circuit protection, and thermal
shutdown. The built-in under-voltage lockout (UVLO)
protection turns the switching transistor OFF, when
input voltage becomes less than 4.5 V.
The IXD3270/1 controller is available in SOP-8FD
package.
FEATURES
o
Operating Input Voltage Range: 7.0 V ~ 30 V
Reference Voltage: 0.8 V ± 2%
Maximum Output Current : 2.0 A
Oscillation Frequency: 300 kHz – 500 kHz
Operating Mode: PWM only or PFM/PWM
automatically selected
Soft Start: set by external capacitor
Protection: Over-current at 3.2 A with Integral Latch
(version A) or Automatic Recovery (version B), and
Thermal Shutdown
Low ESR Ceramic Capacitors Compatible
o
Operating Ambient Temperature : -40 ～+105℃
o
o
Package: SOP-8FD
Environmentally Friendly : EU RoHS Compliant, Pb
Free
o
o
o
o
o
o
o
APPLICATION
o
o
o
o
Digital home appliances
Office automation equipment
Car accessories power supplies
Various portable equipment
DESCRIPTION
The IXD3270/1 is a 30V input voltage step-down
DC/DC converter IC operating with a build-in internal
N-channel transistor.
.
TYPICAL APPLICATION CIRCUIT
TYPICAL PERFORMANCE CHARACTERISTIC
Efficiency vs. Output Current
IXD3270x085/71x085
VIN = 12 V, VOUT = 5 V, L = 15 µH (CLF12555-150M), D: CMS15, CIN = 10 µF
(GRM32ER71H106KA12L), CL = 22 µF × 2 (GRM32ER71E226KE15L)
© 2014 IXYS Corp.
Characteristics subject to change without notice
1
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VIN Pin Voltage
SYMBOL
RATINGS
VIN
– 0.3 ~ 36
V
2)
BST Pin Voltage
VBST
FB Pin Voltage
VFB
– 0.3 ~ +6.5
V
VSYNC
– 0.3 ~ +6.5
V
SYNC Pin Voltage
– 0.3 or
VLX1)
UNITS
– 0.3 – VLX + 6.5 or 36
V
CE Pin Voltage
VRB
– 0.3 ~ 36
V
SS Pin Voltage
VSS
– 0.3 ~ +6.5
V
LX Pin Voltage
VLX
– 0.3 ~ VIN +0.3 or +363))
V
LX Pin Current
ILX
4.2
A
Surge Voltage
VSRG
464)
V
Power Dissipation
300
PD
1500 (PCB mounted)
mW
Operating Temperature Range
TOPR
– 40 ~ + 105
0
Storage Temperature Range
TSTG
– 55 ~ +125
0
C
C
Note:
* All voltages are in respect to the GND pin.
1) The maximum value should be -0.3 or VLX - 0.3 V, which is the lowest.
2) The maximum value should be VLX + 6.5 or + 36 V, which is the lowest.
3) The maximum value should be VIN + 0.3 or + 36 V, which is the lowest.
4) Applied Time ≦ 400 ms
© 2014 IXYS Corp.
Characteristics subject to change without notice
2
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
ELECTRICAL OPERATING CHARACTERISTICS
IXD327xx08x
Unless otherwise specified, Ta = 25 0C
PARAMETER
SYMBOL
Reference Voltage
FB Voltage Temperature
Characteristics
VREF
∆
∗∆
Output Voltage Range1)
VOUT
Operating Input Voltage Range
UVLO Detection Voltage5)
6)
UVLO Release Voltage
Quiescent
Current
IXD327xx083
IXD327xx085
Standby Current
Oscillation
Frequency
IXD327xx083
CONDITIONS
VSS = 6 V
VUVLOR
IQ1
VSS = 6 V, VFB = 0.65 V2
VSS = 6V, VFB = 0.65 V
3
360
µA
0.1
µA
324
kHz
fOSC2
IOUT = 100 mA
500
IOUT = 0 mA
fOSC
540
fOSC x
1.25
75
kHz
fSYNC
460
fOSC x
0.75
25
83
85
88
%
0
%
240
mA
VFB = 0.95 V
VFB = 0.65 V, VSS = 6 V
PFM Switch Current
IPFM
IOUT = 0 mA – IXD3271x08x version only
Current Limit2)
ILIM
VFB = 0.65 V,) VSS = 6 V
Efficiency 3)
250
300
RLX
IXD327xx085
5.3
310
0.01
DMIN
IXD327xx083
V
5.0
200
276
LX ON Resistance
External SoftStart Time7)
V
V
VIN = 30 V, VCE = VSS = VSYNC = 0 V
Minimum Duty Cycle Ratio
IXD327xx085
4.9
IOUT = 300 mA
IOUT = 0 mA
IXD327xx083
4.6
ISTB
VFB = 0.65 V,
Internal SoftStart Time7)
-
4.3
tLAT
VFB_SHORT
VFB = 0.65 V,) VSS = 6 V - A series only
VSS = 6 V
tSS1
VIN = VCE = 12 V, VFB = VREF x 0.9 V, VSS = 6 V 8)
tSS2
VIN = VCE = 12 V, VFB = VREF x 0.9 V, CSS = 0.01 µF8)
VSS = 6 V
EFFI
160
2.4
3.2
0.8
1.3
1.8
0.4
0.7
1.0
0.35
0.4
0.45
0.8
1.3
2.0
0.4
0.7
1.2
9
15
24
5
9
15
IOUT = 1 A
VSYNCH
IOUT
10
SYNC “L” Voltage
VSYNCL
IOUT
SYNC “H” Current
ISYNCH
VIN = VCE = 30 V, VFB = 0.95 V, VSYNC = 6 V
SYNC “L” Current
ISYNCL
VIN = VCE = 30 V, VFB = 0.95 V, VSYNC = 0 V
%
A
91
SYNC “H” Voltage9
kHz
Ω
0.3
80
ms
V
ms
ms
%
1.5
6.0
V
0
0.4
V
-0.1
0.1
µA
-0.1
0.1
µA
FB “H” Current
IFBH
VIN = VCE = 30 V, VFB = 6 V, VSS = 6 V
-0.1
0.1
µA
FB “L” Current
IFBH
VIN = VCE = 30 V, VFB = 0 V, VSS = 6 V
-0.1
0.1
µA
CE “H” Voltage8
VMH
VFB = 0.65 V, VSS = 6 V
2.8
30
V
CE “L” Voltage9
VML
VFB = 0.65 V, VSS = 6 V
0
1
V
CE “H” Current
IMH
VIN = VCE = 30 V, VFB = 0.95 V
-0.1
0.1
µA
CE “L” Current
IML
VIN = 30 V, VCE 0 V, VFB = 0.95 V
-0.1
0.1
µA
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
TTSD
TH
CIRCUIT
V
fOSC1
DMAX
Short Protection Threshold7)
7
VIN – 3
or 124)
30
VIN = VCE = 30 V, VFB = 0.95 V,
DSYNC
IXD327xA085
UNIT
ppm/0C
4.7
Maximum Duty Cycle Ratio
Latch Time)
MAX.
±50
1.2
IXD327xx085
External Clock Synchronization
Range
External Clock Duty Cycle
IXD327xA083
TYP.
V
-400C ≤ TOPR ≤ 1050C, IOUT = 100 mA
VIN
VUVLOD
MIN.
0.784 0.800 0.816
150
0
25
0
C
C
NOTE: Unless otherwise stated, VIN = VCE = 12 V, VSYNC = VSS = 2 V, L = 22 µH, CIN = 10 µF, CL = 47µF, CSS = 1 µF, RFB1 = 2 kΩ, RFB2 = 390 Ω,
CFB = 10 nF,
1)
2)
3)
4)
Limited by minimum ON time of 0.22 µs
Determines inductor peak current value
EFFI = {(output voltage × output current) / (input voltage × input
current)}×100
VIN – 3 V or 12 V whichever is lower
© 2014 IXYS Corp.
Characteristics subject to change without notice
5)
6)
7)
8)
9)
3
VIN voltage, at which LX pin changes state from HIGH to LOW
VIN voltage, at which LX pin changes state from LOW to HIGH
Time from CE = High until LX pin oscillations start
CE pin voltage, at which LX pin oscillations start
CE pin voltage, at which LX pin oscillations stop
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
PIN CONFIGURATION
The dissipation pad for this IC should be solderplated for mounting strength and heat dissipation.
Please refer to the reference mount pattern and
metal masking. The dissipation pad should be
connected to the GND (No. 6) pin.
SOP-8FD (Top View)
PIN ASSIGNMENT
1
2
PIN NAME
VIN
CE
3
SYNC
4
5
6
7
8
FB
SS
GND
BST
LX
PIN NUMBER
FUNCTIONS
Power Input
Chip Enable Input (Logic LOW – Standby, HIGH – Active)1)
External CLK Synchronization Input
(Logic LOW or HIGH – operates with internal clock frequency,
CLK – Synchronized with External Clock)1)
Feedback Signal Input
Soft Start External Capacitor Connection
Ground
Bootstrap
Switching Output
NOTE:
1) Do not leave the CE and MODE/SYNC pin open.
BLOCK DIAGRAMS
IXD3270A
Internal diodes include an ESD protection and a parasitic diode
© 2014 IXYS Corp.
Characteristics subject to change without notice
4
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
IXD3270B
Internal diodes include an ESD protection and a parasitic diode
IXD3271A
Internal diodes include an ESD protection and a parasitic diode
© 2014 IXYS Corp.
Characteristics subject to change without notice
5
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
IXD3271B
Internal diodes include an ESD protection and a parasitic diode
BASIC OPERATION
The IXD3270/1 converter consists of a Reference Voltage supply, Ramp Wave circuit, Error Amplifier, PWM
Comparator, Phase Compensation circuit, N-channel switching transistor, Current Limiting circuit, Under-voltage
Lockout (UVLO), internal power supply (VL), gate clamp (CLAMP), Thermal shutdown (TSD), Oscillator (OSC), Soft
Start circuit, Control block, and other elements.
The error amplifier compares feedback voltage from the FB pin with the internal reference. The output signal, which
is a multiplied and phase compensated difference between feedback and reference voltage, applies to the one
input of PWM Comparator to turn switching transistor ON. The PWM Comparator compares this signal with the
ramp wave to turn the switching transistor OFF.
These operations perform continuously to keep the output voltage stable.
The Current Limiting circuitry monitors switching transistor current during each pulse and modulates the output
signal from the error amplifier creating a multi-feedback signal. This allows stabilize system and output voltage
even when low ESR ceramic capacitors are used at the output.
The IC utilizes bootstrap architecture to generate voltage higher than the VIN to drive an N-channel MOS transistor
as a Hi side driver.
Reference voltage source
The reference voltage source provides the reference voltage to ensure stable output voltage of the DC/DC
converter.
Oscillator circuit
The Oscillator’s frequency is fixed internally and can be selected as either 300 kHz, or 500 kHz. Clock pulses
generated by this circuit are used to produce ramp waveforms needed at PWM operation.
Error amplifier
The Error Amplifier compares reference voltage with the feedback signal, which is an output voltage divided by the
external resistive divider RFB1 and RFB2. If a feedback signal is less than the reference voltage, the Error Amplifier’s
output voltage increases, increasing ON time of the switching transistor, which results in higher output voltage. The
Error Amplifier output signal is internally phase compensated to optimize IC performance.
Chip Enable
The IXD3270/1 can be forced into standby mode by applying LOW signal to the CE pin. The IC input current in the
standby mode is less than 1 µA. HIGH-level signal applied to CE pin resumes operation.
Current Limiting, Short Circuit protection
© 2014 IXYS Corp.
Characteristics subject to change without notice
6
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
The Current Limiting circuits of IXD3270/1B version combine both current limiting and short-circuit protection.
The Current Limiting circuit monitors current through N-channel switching transistor. When current goes above
circuit’s threshold, the current limiting circuit activates and turns switching transistor off (see partition 1 at figure
below). However, if this condition exists for prolonged time, that results in the switching frequency drop and the
output voltage drop to about 90% of the regular value (partition 2).
When the Current Limiter active state releases, the output voltage, and the switching frequency returns to the
nominal value.
However, if the output voltage continue falling further, the output current remains limited, the switching frequency
lowers further, and controller enters the short-circuit state (partition 3). When the load becomes lighter than the
short circuit state, IC restarts automatically through soft-start to prevent over shoot.
Integral Latch protection
When the current limiting state continues for a certain time, the Current Limiting circuit of the IXD3270/1C latches
and stops the LX pin in the HIGH-level state turning the switching transistor off.
To restart operation from latch stop state, CE pin should be triggered LOW/HIGH, or the VIN pin voltage should be
set for a short time below the UVLO detection voltage. The IXD3270/1C will restart through soft start mode to
prevent output voltage overshoot.
Thermal Shutdown
Thermal Shutdown circuitry monitors chip temperature to prevent IC from damage. The Thermal Shutdown circuit
0
starts operating, when the chip’s temperature reaches 150 C and turns off the N-channel MOSFET driver transistor.
0
When the temperature drops to 125 C or less, the IC performs soft-start to resume normal operation.
UVLO
When the VIN pin voltage falls below 4.6 V, switching transistor stops to prevent false pulse output due to instable
operation of the internal circuits, and LX pin goes HIGH. When the VIN pin voltage rises above 5.0 V, the UVLO
© 2014 IXYS Corp.
Characteristics subject to change without notice
7
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
function releases, the soft-start function activates, and switching resumes. Stopping by UVLO is not a shutdown,
because only pulse output is stopped, but the internal circuitries are active.
SYNC function
When an external clock (± 25% of the IXD3270/1 free running frequency and 25% - 75% duty cycle) applied to the
SYNC pin, internal frequency synchronizes with the falling edge of the external clock and the IXD3270/1 enters
PWM mode.
If external clock stops either in high or low state for more than three periods, synchronization stops and the
IXD3270/1 resumes operations with a free running frequency.
Switching from free running frequency to external synchronization
Switching from external synchronization to free running frequency
TYPICAL APPLICATION CIRCUIT
© 2014 IXYS Corp.
Characteristics subject to change without notice
8
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
EXTERNAL COMPONENTS
Recommended Components
COMPONENT
VALUE
PART NUMBER
15 µH
22 µH
33 µH
20 µH
Inductor
Diode
Capacitor CIN1
Capacitor CIN2
CLF12555-150M
CLF12555-220M
CLF12555-3350M
TCM 0840-200
CMS15
GRM32ER71H106K
GRM32ER71H101K
GRM32ER71A476K
GRM32ER71E226K
25SVP47M
10 µF 50 V
1 µF 50 V
47 µF 10 V
22 µF 25 V x 2
47 µF 25 V
0.01 µF 10 V
1000 pF 10 V
1 µF 10 V
Capacitor CL1)
Capacitor CSS2)
Capacitor CSYNC3)
Capacitor CBST
MANUFACTURER
TDK
Toho Zinc
TOSHIBA
Murata
Murata
Panasonic
1) CIN capacitor consists of two of them connected in parallel, i.e. 10 µF + 1 µF capacitor.
2) CSS not required (SS pin OPEN), if the internal soft start used.
3) CSYNC not required (SYNC pin shorted to GND), if the external CLK synchronization function is not used.
VOUT Setting
The 0.8 V reference voltage allows set the output voltage in the range from 1.2 V to 12 V by external resistive
divider. Values of resistors RFB1 and RFB2 determine the output voltage as given in the equation below.
=
0.8
+
RFB2 ≤ 15 kΩ
Adjust the value of the phase compensation capacitor CFB using follow equation:
1
=
2
A target value
!
=
"#$% &
= 10 kHz is optimum to provide stable operations.
Example:
When RFB1 = 68 kΩ, RFB2 = 13 kΩ, VOUT = 0.8 × (68 kΩ + 13 kΩ) / 13 kΩ = 4.98 V
When fzfb is set to 10.64 kHz using the above equation, CFB = 1/ (2×π×10.64 kHz × 68 kΩ) = 220pF.
Lx ON time longer than 0.22 µs (TYP.) required at a frequency of 300 kHz and 0.15 µs (TYP.) at 500 kHz. If the
dropout voltage is too large and the minimum Lx ON time is not satisfied, pulse skipping will occur and the output
voltage will be not stable.
Selecting Inductance value
Recommended inductance value depends on the switching frequency and output voltage as shown below.
Switching Frequency
1.2 V ≤ VOUT < 6 V
6 V ≤ VOUT < 12 V
300 kHz
500 kHz
20 µH – 22 µH
15 µH
33 µH
20 µH – 22 µH
Selecting CL Capacitor
A low ESR capacitor can be used as a load capacitor CL; however, if a ceramic capacitor is used, the IXD3270/1
output voltage is restricted to VOUT = 2.5 V or higher. If VOUT < 2.5 V required, an OS-CON (conductive polymer
aluminum solid electrolytic capacitor) recommended. Select a capacitor with good temperature characteristics in
respect with VOUT and switching frequency as shown in the table below.
Switching
Frequency
200 kHz < 400 kHz
400 kHz ≤ 550 kHz
VOUT < 2.5 V
VOUT ≥ 2.5 V
OS-CON
47 µF
22 µF
Ceramic
22 µF x 2
22 µF
© 2014 IXYS Corp.
Characteristics subject to change without notice
9
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
Soft-start function
The soft-start time determines time from the moment VCE goes HIGH until the output voltage reaches 90% of the
set value. The IXD3270/1 soft-start minimum value tSS1 is set internally to about tSS1 = 1.3 ms at fOSC = 300 kHz and
tSS1 = 0.7 ms at fOSC = 500 kHz and it can be adjusted by an external capacitor connected between SS pin and
ground. The soft-start time depends on the CSS capacitance as
tSS2 = 1.08 x CSS / ISS, ms, where
CSS is an external capacitance, nF,
ISS = 0.72 µA (TYP) at fOSC = 300 kHz, and ISS = 1.2 µA (TYP) at fOSC = 500 kHz
fOSC is an IXD3270/1 oscillation frequency.
Example:
If fOSC= 300 kHz and CSS = 10 nF, tss2 = 1.08 × 10/0.72 = 15 ms
If fOSC= 500 kHz and CSS = 10 nF, tss2 = 1.08 ×10/1.2 = 9 ms
LAYOUT AND USE CONSIDERATIONS
1. Place external components as close to the IC as possible and use thick, short connecting traces to reduce
the circuit impedance. Please, pay special attention to the VIN and GND wiring. Switching noise, which
occurs from the GND, may cause the instability of the IC, so, position VIN capacitors as close to IC as
possible.
2. The absolute maximum ratings of the IC and external components should not be exceeded
3. The IXD3270/1 is designed to work with ceramic output capacitors. We recommend capacitors with X7R or
X5R ceramic.
4. A large difference between VIN and VOUT voltage, as well as high load current, increase inductor peak
current, which may result in activation of the current limiting circuit and unstable IC operations. To avoid this
condition, increase inductor’s value to set current below current limiting circuit threshold. The following
formula can be used to determine inductor peak current.
'& =
()* +(,-. (,-.
()* & ,/0
+ '
, (A), where:
VIN – input voltage, V
VOUT – output voltage, V
L – Inductance, µH
IOUT – output current, A
f. – oscillation frequency
5. At large difference between VIN and VOUT voltage, the propagation delay time of internal signals could rampup the inductor current with staircase waveform exceeding the current limit.
6. Switching between continuous and discontinuous conduction modes may increase ripple voltage.
7. A ripple voltage may increase at light load due charging the CBST capacitor, and this is a normal condition.
8. The IC enters test mode when a 6 V external power supply is applied to the SS pin. Do not apply an
external power supply to the SS pin at normal operations.
9. The IC operation becomes unstable below the minimum operating voltage.
10. The ambient electrical noise and quality of the circuit board may cause release from the current limiting
mode. The latch time may lengthen as well, or latch operation may fail. Test sufficiently using the actual
equipment.
11. When operation changes from free running frequency to external CLK synchronization, the output voltage
may fluctuate. Examine this condition on system level.
© 2014 IXYS Corp.
Characteristics subject to change without notice
10
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
Recommended PCB layout
TEST CIRCUITS
Circuit
Circuit
Circuit
Circuit
Circuit
External Components
CIN = 10 µF, CSS = 0.01 µF, CL = 47 µF, CBST = 1 µF, L = 22 µH,
© 2014 IXYS Corp.
Characteristics subject to change without notice
11
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
TYPICAL PERFORMANCE CHARACTERISTICS (IXD3270/1A)
0
(1) Efficiency vs. Output Current
Topr = 25 C
IXD327xx083
IXD327xx083
L= 22 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 1.8 V
L= 22 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 5.0 V
IXD327xx083
IXD327xx083
L= 22 µH, CIN =10 µF, CL= 44 µF, VIN = 24 V, VOUT = 5.0 V
L= 30 µH, CIN =10 µF, CL= 44 µF, VIN = 24 V, VOUT = 12 V
IXD327xx085
IXD327xx085
L= 15 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 1.8 V
L= 15 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 5.0 V
IXD327xx085
IXD327xx085
L= 15 µH, CIN =10 µF, CL= 44 µF, VIN = 24 V, VOUT = 5.0 V
L= 15 µH, CIN =10 µF, CL= 44 µF, VIN = 24 V, VOUT = 12 V
© 2014 IXYS Corp.
Characteristics subject to change without notice
12
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(2) Output Voltage vs. Output Current
IXD327xx083
IXD327xx083
L= 22 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 1.8 V
L= 22 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 5.0 V
IXD327xx083
IXD327xx083
L= 22 µH, CIN =10 µF, CL= 44 µF, VIN = 24 V, VOUT = 5.0 V
L= 30 µH, CIN =10 µF, CL= 44 µF, VIN = 24 V, VOUT = 12 V
IXD327xx085
IXD327xx085
L= 15 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 1.8 V
L= 15 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 5.0 V
IXD327xx085
IXD327xx085
L= 15 µH, CIN =10 µF, CL= 44 µF, VIN = 24 V, VOUT = 5.0 V
L= 15 µH, CIN =10 µF, CL= 44 µF, VIN = 24 V, VOUT = 12 V
© 2014 IXYS Corp.
Characteristics subject to change without notice
13
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(3) Ripple Voltage vs. Output Current
IXD327xx083
IXD327xx085
L= 22 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 5.0 V
L= 15 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 5.0 V
(4) FB Voltage vs. Ambient Temperature
(5) UVLO Voltage vs. Ambient Temperature
IXD327xx08x
IXD327xx08x
VIN = 12 V
(6) Oscillation Frequency vs. Ambient Temperature
IXD327xx083
IXD327xx085
VIN = 12 V
VIN = 12 V
(7) Supply Current vs. Ambient Temperature
IXD327xx083
IXD327xx085
VIN = 30 V
VIN = 30 V
© 2014 IXYS Corp.
Characteristics subject to change without notice
14
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(8) Standby Current vs. Ambient Temperature
(9) LX Switch ON Resistance vs. Ambient Temperature
IXD327xx08x
IXD327xx08x
VIN = 30 V
(10) Maximum Duty Cycle vs. Ambient Temperature
(11) PFM Switch Current vs. Ambient Temperature
IXD327xx08x
IXD327xx08x
VIN = 12 V
(12) CE “H” Voltage vs. Ambient Temperature
(13) CE “L” Voltage vs. CSS Value
IXD327xx08x
IXD327xx08x
(14) Internal Soft start Time vs. Ambient Temperature
IXD327xx083
IXD327xx085
VIN = 12 V
VIN = 12 V
© 2014 IXYS Corp.
Characteristics subject to change without notice
15
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(15) External Soft Start Time vs. Ambient Temperature
IXD327xx083
IXD327xx085
VIN = 12 V
VIN = 12 V
(16) Load Transient Response
IXD327xx083
IXD327xx083
L= 22 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 5.0 V , IOUT = 300 mA → 1 A
L= 22 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 5.0 V , IOUT = 1 A → 300 mA
IXD327xx083
IXD327xx083
L= 22 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 5.0 V , IOUT = 1 A → 2 A
L= 22 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 5.0 V , IOUT = 2 A → 1 A
IXD327xx085
IXD327xx085
L= 15 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 5.0 V , IOUT = 300 mA → 1 A
L= 15 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 5.0 V , IOUT = 1 A → 300 mA
© 2014 IXYS Corp.
Characteristics subject to change without notice
16
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(16) Load Transient Response (Continued)
IXD327xx085
IXD327xx083
L= 15 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 5.0 V , IOUT = 300 mA → 1 A
L= 22 µH, CIN =10 µF, CL= 44 µF, VIN = 12 V, VOUT = 5.0 V , IOUT = 2 A → 1 A
(17) Rising Input Voltage Response Time
IXD327xx083
IXD327xx083
L= 22 µH, CIN =10 µF, CL= 44 µF, VOUT = 5.0 V , IOUT = 1 mA, VIN = 0 V → 12 V
L= 22 µH, CIN =10 µF, CL= 44 µF, VOUT = 5.0 V , IOUT = 1 mA, VIN = 0 V → 24 V
IXD327xx085
IXD327xx085
L= 22 µH, CIN =10 µF, CL= 44 µF, VOUT = 5.0 V , IOUT = 1 mA, VIN = 0 V → 12 V
L= 22 µH, CIN =10 µF, CL= 44 µF, VOUT = 5.0 V , IOUT = 1 mA, VIN = 0 V → 24 V
© 2014 IXYS Corp.
Characteristics subject to change without notice
17
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(18) Input Voltage Transient Response
IXD327xx083
IXD327xx083
L= 22 µH, CIN =10 µF, CL= 44 µF, VOUT = 5.0 V , IOUT = 1 A, VIN = 12 V → 30 V
L= 22 µH, CIN =10 µF, CL= 44 µF, VOUT = 5.0 V , IOUT = 1 A, VIN = 30 V → 12 V\
IXD327xx085
IXD327xx085
L= 22 µH, CIN =10 µF, CL= 44 µF, VOUT = 5.0 V , IOUT = 1 A, VIN = 12 V → 30 V
L= 22 µH, CIN =10 µF, CL= 44 µF, VOUT = 5.0 V , IOUT = 1 A, VIN = 30 V → 12 V
ORDERING INFORMATION
IXD3270
IXD3271
-
DESIGNATOR
PWM
PWM/PFM Auto Switch mode
DESCRIPTION
SYMBOL
A
B
08
3
5
QR-G
Type of DC/DC Controller
Reference Voltage
Oscillation Frequency
(*1)
-
Packages (Order Limit)
DESCRIPTION
Refer to Selection Guide
Fixed 0.8 V
300 kHz
500 kHz
SOP-8FD (1,000/Reel)
(*1) The “-G” suffix denotes halogen and antimony free, as well as being fully ROHS compliant.
PRODUCT CLASSIFICATION
TYPE
CURRENT
LIMITER
LATCH
PROTECTION
CHIP
ENABLE
THERMAL
SHUTDOWN
UVLO
A
B
Yes
Yes
Yes
No
Yes
No
Yes
Yes
Yes
Yes
© 2014 IXYS Corp.
Characteristics subject to change without notice
18
SYNCHRONIZED WITH
EXTERNAL CLOCK
Yes
Yes
SOFT
START
Yes
No
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
PACKAGE DRAWING AND DIMENSIONS
SOP-8FD (Units: mm)
SOP-8FD Reference Pattern Layout (Units: mm)
© 2014 IXYS Corp.
Characteristics subject to change without notice
SOP-8FD Referencre Metal Mask Design (Units: mm)
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Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
MARKING
SOP-8FD
Represents product series
MARK
C
D
PRODUCT SERIES
IXD3270xxxxxx-G
IXD3271xxxxxx-G
Represents product types
MARK
PRODUCT SERIES
IXD3270Axxxxx-G
IXD3271Axxxxx-G
IXD3270Bxxxxx-G
IXD3271Bxxxxx-G
A
B
Represents FB voltage and oscillation frequency
MARK
REFERENCE
VOLTAGE, V
3
5
A
B
0.8
OSCILLATION
FREQUENCY, kHz
300
500
300
500
PRODUCT SERIES
IXD3270x083xx-G
IXD3270x085xx-G
IXD3271x083xx-G
IXD3271x085xx-G
Represents production lot number
01～09、0A～0Z、11～9Z、A1～A9、AA～AZ、B1～ZZ in order.
(G, I, J, O, Q, and W excluded)
© 2014 IXYS Corp.
Characteristics subject to change without notice
20
Doc. No. IXD3270_DS, Rev. N0
IXD3270/1
Warranty and Use
IXYS CORP. MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS PRODUCTS FOR ANY
PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE RIGHTS OF THIRD
PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING OUT OF ANY SUCH
USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES.
IXYS Corp. products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended
to support or sustain life, or for any other application in which the failure of the IXYS Corp. product could create a situation where personal injury or death may occur.
IXYS Corp. reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets labeled "Advance
Information" or "Preliminary" and other products described herein may not be in production or offered for sale.
IXYS Corp. advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate typical semiconductor
applications and may not be complete.
IXYS Corp.
1590 Buckeye Dr.
Milpitas, CA 95035-7418
Phone: 408. 457.9000
Fax:
408. 496.0222
http://www.ixys.com
© 2014 IXYS Corp.
Characteristics subject to change without notice
Document No:IXD370_DS
Revision:
N0
Issue date:
3/16/2015
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Doc. No. IXD3270_DS, Rev. N0