APU3137 Datasheet, PDF (1/17 Pages) Advanced Power Electronics Corp. – 8-PIN SYNCHRONOUS PWM CONTROLLER

Technology Licensed from International Rectifier
APU3137
8-PIN SYNCHRONOUS PWM CONTROLLER
FEATURES
1A Peak Output Drive Capability
0.8V Reference Voltage
Shuts off both drivers at shorted output
and shutdown
Operating with single 5V or 12V supply voltage
Stable with ceramic capacitors
Internal 200KHz Oscillator
Soft-Start Function
Protects the output when control FET is shorted
Synchronous Controller in 8-Pin Package
RoHS Complaint
APPLICATIONS
DDR Memory Application
Low voltage distributed DC-DC
Graphic Cards
Low cost on-board DC to DC such as 5V to 2.5V,
1.8V or 0.8V
DESCRIPTION
The APU3137 controller IC is designed to provide a low
cost and high performance synchronous Buck regulator
for on-board DC to DC converter applications. The out-
put voltage can be set as low as 0.8V and higher voltage
can be obtained with an external voltage divider. High
peak current gate drivers provide fast switching transi-
tion for applications requiring high output current in the
range of 15A to 20A.
This device features an internal 200KHz oscillator, un-
der-voltage lockout for both Vcc and Vc supplies, an
external programmable soft-start function as well as
output under-voltage detection that latches off the de-
vice when an output short is detected.
TYPICAL APPLICATION
12V
C3
C4
1uF
1uF
Optional
L1
C2
4x 150uF
1uH
5V
C1
47uF
Vcc Vc
HDrv
SS/SD
C8
U1
0.1uF
APU3137 ^LDrv
Comp
C9
Fb
3300pF
R4
Optional
30K
Gnd
Q1
IRF7832
D1
Q2
IRF7832
L2
2.2uH
R5
1K, 1%
R3
2.15K
2.5V
@ 15A
C7
3x 330uF
40mΩ, Poscap
Figure 1 - Typical application of APU3137.
PACKAGE ORDER INFORMATION
TA (°C)
0 To 70
DEVICE
APU3137M
PACKAGE
8-Pin Plastic SOIC NB (M)
FREQUENCY
200KHz
Data and specifications subject to change without notice.
200510061-1/17