General Description

The RT9259 is a dual-channel DC/DC controller specifically designed to deliver high quality power where 12V power source is available. This part consists of a synchronous buck controller and an LDO controller. The synchronous buck controller integrates MOSFET drivers that support 12V+12V bootstrapped voltage for high efficiency power conversion. The bootstrap diode is built-in to simplify the circuit design and minimize external part count. The LDO controller drives an external N-MOSFET for lower power requirement.

Features

Single 12V Bias Supply

Support Dual Channel Power Conversion

One Synchronous Rectified Buck PWM Controller

One Linear Controller

Both Controllers Drive Low Cost N-MOSFETs

Adjustable Frequency from 150kHz to 1MHz and Free-Run Frequency at 230kHz

Small External Component Count

Output Voltage Regulation

PWM Controller : ±1 Accuracy

LDO Controller : ±2 Accuracy

Two Internal VREFPower Support Lower to 0.8V

Adjustable External Compensation

Linear Controller Drives N-MOSFET Pass Transistor

Fully-Adjustable Outputs

Under Voltage Protection for Both Outputs

Over Current Fault Monitor on MOSFET; No Current Sense Resistor is Required.

RoHS Compliant and 100 Lead (Pb)-Free

Applications

Graphic Card GPU, Memory Core Power

Graphic Card Interface Power

Motherboard, Desktop and Servers Chipset and Memory Core Power

IA Equipments

Telecomm Equipments

High Power DC-DC Regulators