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General Description

The RT9232 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 RT9232 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-Channel 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 to 12V Input DC-DC Regulators

Low Voltage Distributed Power Supplies