IR3637SPBF 반도체 회로 부품 판매점
1% ACCURATE SYNCHRONOUS PWM CONTROLLER
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 International Rectifier |
www.DataSheet4U.com
Data Sheet No. PD94713
IR3637SPBF
1% ACCURATE SYNCHRONOUS PWM CONTROLLER
FEATURES
0.8V Reference Voltage
Operates with a single 5V Supply Voltage
Internal 400kHz Oscillator
Soft-Start Function
Fixed Frequency Voltage Mode
Short Circuit Protection
APPLICATIONS
Computer Peripheral Voltage Regulator
Memory Power supplies
Graphics Card
Low cost on-board DC to DC
DESCRIPTION
The IR3637 controller IC is designed to provide a simple
synchronous Buck regulator for on-board DC to DC ap-
plications in a small 8-pin SOIC. The output voltage can
be precisely regulated using the internal 0.8V reference
voltage for low voltage applications.
The IR3637 operates at a fixed internal 400kHz switch-
ing frequency to reduce the component size.
The device features under-voltage lockout for both input
supplies, an external programmable soft-start function
as well as output under-voltage detection that latches
off the device when an output short is detected.
TYPICAL APPLICATION
12V
C3
5V
C2
C1
Vc Vcc
HDrv
Q1
L1
SS/SD
D1
C4
IR3637 LDrv
Q2
Comp
C5
Fb
Gnd
R1
R3
R2
Vout
C6
Figure 1 - Typical application of IR3637.
ORDERING INFORMATION
PKG
DESIG
S
S
PACKAGE PIN PARTS PARTS T & R
DESCRIPTION COUNT PER TUBE PER REEL Oriantation
IR3637SPBF
IR3637STRPBF
8
8
95
-------
------
2500
Fig A
Rev. 1.1
06/16/05
www.irf.com
1
www.DataSheet4U.com
IR3637SPBF
ABSOLUTE MAXIMUM RATINGS
Vcc Supply Voltage ................................................ 16V
Vc Supply Voltage .................................................. 25V
Storage Temperature Range ..................................... -65°C To 150°C
Operating Junction Temperature Range ..................... 0°C To 125°C
ESD Classification ................................................. HMB Class 2 (2KV) JEDEC Standard
Moisture Sensitivity Level ........................................ JEDEC Level 1 @ 260°C
Caution: Stresses above those listed in “Absolute Maximum Rating” may cause permanent damage to the device. These are stress
ratings only and function of the device at these or any other conditions beyond those indicated in the operational sections of the specifica-
tions is not implied. Exposure to “Absolute Maximum Rating” conditions for extended periods may affect device reliability
PACKAGE INFORMATION
Recommended Operating Conditions
Fb 1
Vcc 2
LDrv 3
Gnd 4
8 SS/SD
7 Comp
6 Vc
5 HDrv
Parameter
Vcc
Vc
Min
4.5
8
Max
5.5
14
Units
V
V
θJA=154°C/W
θJC=41.2°C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over Vcc=5V, Vc=12V and 0°C<Tj<125°C.
PARAMETER
Feedback Voltage
Fb Voltage
SYM
TEST CONDITION
VFB 25°C<Tj<75°C
0°C<Tj<125°C
MIN
0.792
0.789
TYP
0.800
0.800
MAX
0.808
0.811
UNITS
V
V
Fb Voltage Line Regulation
LREG 4.5<Vcc<5.5
0.1 %
UVLO
UVLO Threshold - Vcc
UVLO Hysteresis - Vcc
UVLO Threshold - Vc
UVLO Hysteresis - Vc
UVLO Threshold - Fb
Supply Current
UVLO Vcc Supply Ramping Up
UVLO Vc Supply Ramping Up
UVLO Fb Fb Ramping Down
4.0 4.2 4.4
0.25
3.1 3.3 3.5
0.2
0.3 0.4 0.5
V
V
V
V
V
Vcc Dynamic Supply Current Dyn Icc Freq=400kHz, CL=1500pF
4
8 16 mA
Vc Dynamic Supply Current Dyn Ic Freq=400kHz, CL=1500pF
6
15 20 mA
Vcc Static Supply Current
ICCQ SS=0V
1 3.3 6 mA
Vc Static Supply Current
ICQ SS=0V
0.5 1 4.7 mA
Soft-Start Section
Charge Current
Shutdown Threshold
SSIB SS=0V
SD Note1
-15 -25 -35 µA
0.4 V
Note1: Guaranteed by design. Not production tested.
2 www.irf.com
Rev.1.1
06/16/05
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IR3637SPBF controller
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