RT9205SLASHACS datasheet(6/16 Pages) RICHTEK

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RT9205/A

Preliminary

www.richtek.com

DS9205/A-03 May 2003

Functional Pin Description

LGATE (Pin 1)

Connect the LGATE pin to the gate of lower MOSFET.

This pin provides the gate drive for the lower MOSFET.

PGND/GND (Pin 2, 3)

Signal and power ground for the IC. All voltage levels

are measured with respect to this pin.

VCC (Pin 4)

This is the main bias supply for the RT9205/A. This pin

also provides the gate bias charge for the gate of lower

MOSFET. The voltage at this pin is monitored for

ensuring a proper power-on reset (POR). This pin is

also the out of an internal 6.0V regulator that powered

from the BOOT pin when the BOOT pin is directly

powered from ATX 12V.

DRV (Pin 5)

This pin is the output of a linear controller. It should be

connected to the base of an external bypass NPN

transistor or the gate of a N-MOSFET to form a linear

low dropout regulator.

FBL (Pin 6)

This pin is connected to the output resistor-divider of

an external power transistor or a N-MOSFET based

low dropout regulator for regulating and monitoring the

output voltage. This pin is also connected to the

protection monitor and the invertering input of error

amplifier of internal linear regulator inside the IC.

FB (Pin 9)

This pin is connected to the PWM converter’s output –

divider for regulating and monitoring the output voltage

of buck converter. This pin also connects to the

protection monitor and the inverting input of internal

PWM error amplifier inside the IC.

BOOT (Pin 13)

This pin provides ground referenced bias voltage to the

upper MOSFET driver. A bootstrap circuit is used to

create a voltage that is suitable for driving a logic-level

N-channel 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 generating bias required

inside the IC.

UGATE (Pin 14)

Connect the UGATE pin to the gate of upper MOSFET.

This pin provides the gate drive for the upper MOSFET.

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