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.

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

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