RT9232A
Programmable Frequency Synchronous Buck PWM Controller
General Description
The RT9232A is a single-phase synchronous buck PWM
DC-DC converter controller designed to drive two N-Channel
MOSFET. It provides a highly accurate, programmable
output voltage precisely regulated to low voltage
requirement with an internal 0.8V
±
1% reference.
The RT9232A uses an external compensated, single
feedback loop voltage mode PWM control for fast transient
response. An oscillator with Programmable frequency
(50kHz to 800kHz) reduces the external inductor and
capacitor component size for saving PCB board area.
The RT9232A
provides fast transient response to satisfy
high current output applications (up to 25A) while
minimizing external components. It is suitable for high-
performance graphic processors, DDR and VTT power.
The RT9232A integrates complete protect functions such
as Soft Start, Output Enable, UVLO(under-voltage lockout)
into a small 14-pin package.
Features
Single IC Supply Voltage : 12V
Single phase DC/DC Buck Converter with
High Output Current (up to 25A )
Low Output Voltage (down to 0.8V )
High Input Voltage (up to 12V )
Operate from 12V, 5V or 3.3V Input
0.8V
±
1% Internal Reference
Adaptive Non-Overlapping Gate Drivers
Integrated High-Current, HV Gate Drivers
External Programmable Soft Start
External Programmable Frequency
(Range : 50kHz to 800kHz, 200kHz Free Run )
Integrated Output Short Circuit Protection
On/Off Control by Enable Pin
Drives Two N-MOSFET
Full 0 to 100% Duty Cycle
Fast Transient Response
Voltage Mode PWM Control with External
Feedback Loop Compensation
RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RT9232A
Package Type
S : SOP-14
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
RichTek Pb-free and Green products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
100%matte tin (Sn) plating.
Applications
System (Graphic, MB) with 12V Power.
Graphic Cards (AGP 8X, 4X, PCI Express*16):
–
High-Current for High-Performance Graphic Processors
(GPU, VPU)
–
Middle Current for High-Performance Graphic Memory
Power (DDR, DDR II)
–
Low Current with Sink Capacity for High-Performance
Graphic Memory Power (DDR/VTT)
3.3V ~ 12V Input DC-DC Regulators
Low Voltage Distributed Power Supplies
Pin Configurations
(TOP VIEW)
RT
SENSE
SS
COMP
FB
EN
GND
2
3
4
5
6
7
14
13
12
11
10
9
8
VCC
PVCC
LGATE
PGND
BOOT
UGATE
PHASE
SOP-14
DS9232A-02 March 2007
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
