APU3039 Datasheet, PDF (1/22 Pages) Advanced Power Electronics Corp. – SYNCHRONOUS PWM CONTROLLER

Advanced Power
Electronics Corp.
Technology Licensed from International Rectifier
APU3039
SYNCHRONOUS PWM CONTROLLER
FEATURES
WITH OVER CURRENT PROTECTION
DESCRIPTION
Current Limit using Lower MOSFET Sensing
Using the 6V internal regulator for charge pump
circuit allows single supply operation up to 18V
Programmable Switching Frequency up to 400KHz
Soft-Start Function
0.8V Precision Reference Voltage Available
Uncommitted Error Amplifier Available for DDR
Voltage Tracking Applications
Stable with Ceramic Capacitor
RoHS Compliant
APPLICATIONS
The APU3039 controller IC is designed to provide a syn-
chronous Buck regulator and is targeted for applications
where the cost and size is critical. The APU3039 oper-
ates with a single input supply up to 18V. The output
voltage can be programmed as low as 0.8V for low volt-
age applications. Selectable current limit is provided to
tailor to external MOSFET’s on-resistance for optimum
cost and performance. The APU3039 features an uncom-
mitted error amplifier for tracking output voltage and is
capable of sourcing or sinking current for applications
such as DDR bus termination.
DDR Memory VDDQ/VTT Applications
Graphic Card
Hard Disk Drive
Netcom on-board DC to DC regulator application
Output voltage as low as 0.8V
Low Cost On-Board DC to DC
This device features a programmable switching frequency
set from 200KHz to 400KHz, under-voltage lockout for
both Vcc and Vc supplies, an external programmable
soft-start function as well as output under-voltage detec-
tion that latches off the device when an output short is
detected.
TYPICAL APPLICATION
C3
1uF
C7
0.1uF
C11
Optional
D1
C9
1uF
Vcc VOUT2
SS / SD
U1
Vc
HDrv
APU3039
R2
VP
VREF
OCSet
5.76K
Rt
LDrv
Comp
C8
5600pF
R1
14K
Gnd
PGnd ^Fb
C4
1uF
D2
C5
0.1uF
R4
1K
L1
C2
1uH
3x 15uF
25V
Q1
AP9408AGH
Q2
AP9412AGH
R3
3.16K
L2
4.7uH
Figure 1 - Typical application of APU3039.
PACKAGE ORDER INFORMATION
18V
C1
15uF
3.3V @ 8A
C6
2x 330uF
40m
TA (°C)
0 To 70
0 To 70
DEVICE
APU3039VN
APU3039M
PACKAGE
20-Pin VQFN 5x5
14-Pin Plastic SOIC NB
Data and specifications subject to change without notice.
1
200806024