Technology Licensed from International Rectifier
APU3037 / APU3037A
8-PIN SYNCHRONOUS PWM CONTROLLER
DESCRIPTION
The APU3037 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 APU3037 together with dual N-channel
MOSFETs such as AP60T03, 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.
FEATURES
Synchronous Controller in 8-Pin Package
Operating with single 5V or 12V supply voltage
Internal 200KHz Oscillator
(400KHz for APU3037A)
Soft-Start Function
Fixed Frequency Voltage Mode
500mA Peak Output Drive Capability
Protects the output when control FET is shorted
RoHS Compliant
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
0.1uF
C4
1uF
C2
10TPB100M,
100uF, 55m
V
L1
1uH
C1
47uF
Vcc
Vc
HDrv
Q1
AP60T03GH
1N4148
LDrv
Q2
AP60T03GH
R3
249, 1%
Gnd
R5
1.24K, 1%
L2
1.5V/5A
5.6uH, 5.3A
C7
2x 6TPC150M,
150uF, 40m
V
SS/SD
C8
0.1uF
U1
APU3037
C9
2200pF
R4
24k
Comp
Fb
Figure 1 - Typical application of APU3037 or APU3037A.
PACKAGE ORDER INFORMATION
T
A
(°C)
0 To 70
0 To 70
0 To 70
0 To 70
DEVICE
APU3037O
APU3037M/MP
APU3037AO
APU3037AM/AMP
PACKAGE
FREQUENCY
8-Pin Plastic TSSOP (O)
200KHz
8-Pin Plastic SOIC NB (M/MP)
200KHz
8-Pin Plastic TSSOP (O)
400KHz
8-Pin Plastic SOIC NB (M/MP)
400KHz
Data and specifications subject to change without notice.
200507075-1/18
A-POWER [ ADVANCED POWER ELECTRONICS CORP. ]
