Data Sheet No. PD94173
IRU3037 / IRU3037A
8-PIN SYNCHRONOUS PWM CONTROLLER
FEATURES
Synchronous Controller in 8-Pin Package
Operating with single 5V or 12V supply voltage
Internal 200KHz Oscillator
(400KHz for IRU3037A)
Soft-Start Function
Fixed Frequency Voltage Mode
500mA Peak Output Drive Capability
Protects the output when control FET is shorted
DESCRIPTION
The IRU3037 controller IC is designed to provide a low
cost synchronous Buck regulator for on-board DC to DC
converter applications. With the migration of today’s ASIC
products requiring low supply voltages such as 1.8V and
lower, together with currents in excess of 3A, traditional
linear regulators are simply too lossy to be used when
input supply is 5V or even in some cases with 3.3V
input supply. The IRU3037 together with dual N-channel
MOSFETs such as IRF7313, provide a low cost solution
for such applications. This device features an internal
200KHz oscillator (400KHz for "A" version), under-volt-
age lockout for both Vcc and Vc supplies, an external
programmable soft-start function as well as output un-
der-voltage detection that latches off the device when an
output short is detected.
APPLICATIONS
DDR memory source sink Vtt application
Low cost on-board DC to DC such as 5V to 3.3V,
2.5V or 1.8V
Graphic Card
Hard Disk Drive
TYPICAL APPLICATION
5V
12V
C3
1uF
C4
1uF
C2
10TPB100M,
100uF, 55m
V
L1
1uH
C1
47uF
Vcc
Vc
HDrv
Q1
1/2 of IRF7313
L2
1.5V/5A
C7
2x 6TPC150M,
150uF, 40m
V
C8
0.1uF
SS/SD
U1
IRU3037
LDrv
D05022P-562, 5.6uH, 5.3A
Q2
1/2 of IRF7313
R3
Fb
249, 1%
R5
1.24K, 1%
C9
2200pF
R4
24k
Comp
Gnd
Figure 1 - Typical application of IRU3037 or IRU3037A.
PACKAGE ORDER INFORMATION
T
A
(°C)
0 To 70
0 To 70
0 To 70
0 To 70
DEVICE
IRU3037CF
IRU3037CS
IRU3037ACF
IRU3037ACS
PACKAGE
8-Pin Plastic TSSOP (F)
8-Pin Plastic SOIC NB (S)
8-Pin Plastic TSSOP (F)
8-Pin Plastic SOIC NB (S)
FREQUENCY
200KHz
200KHz
400KHz
400KHz
Rev. 2.8
03/10/03
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