RT9202GS datasheet(4/14 Pages) RICHTEK

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RT9202

DS9202-09

March 2007

www.richtek.com

Functional Pin Description

BOOT (Pin 1)

This pin provides ground referenced bias voltage to the

upper MOSFET driver. A bootstrap circuit is used to

create a voltage suitable to drive a logic-level N-MOSFET

when operating at a single 5V power supply. This pin also

could be powered from ATX 12V, in this situation, an internal

6.0V regulator will supply to VCC pin for internal voltage

bias.

UGATE (Pin 2)

Connect UGATE pin to the PWM converter's upper

MOSFET gate. This pin provides the gate drive for the

upper MOSFET.

GND (Pin 3)

Signal and power ground for the IC. All voltage levels are

measured with respect to this pin.

LGATE (Pin 4)

Connect LGATE to the PWM converter's lower MOSFET

gate. This pin provides the gate drive for the lower

MOSFET.

VCC (Pin 5)

This is the main bias supply for the RT9202. This pin also

provides the gate bias charge for the lower MOSFET gate.

The voltage at this pin is monitored for power-on reset

(POR) purpose. This pin is also the internal 6.0V regulator

output powered from BOOT pin when BOOT pin is directly

powered from ATX 12V.

FB (Pin 6)

This pin is connected to the PWM converter's output

divider. This pin also connects to internal PWM error

amplifier inverting input and protection monitor.

OCSET (Pin 7)

Connect a resistor from this pin to the drain of the upper

MOSFET. This resistor, an internal 40

µA current source,

and the upper MOSFET on-resistance set the converter

over-current trip point. An over-current trip cycles the soft-

start function. The voltage at this pin is monitored for

power-on reset (POR) purpose and pulling this pin low

with an open drain device will shut down the IC.

PHASE (Pin 8)

This pin is used to monitor the voltage drop across the

upper MOSFET for over-current protection.

DS(ON)

OCSET

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