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RT8101

12V Synchronous Buck PWM DC-DC

Richtek Technology 

RT8101/A

Typical Application Circuit

Preliminary

12V

RBOOT

VIN(+3.3V/+5V/+12V)

RT8101/A

1 BOOT UGATE 2

5 VCC

8

PHASE

6 FB

LGATE 4

3 GND

COMP 7

RUGATE

Q1

CIN

LOUT

Q2 R

C

VOUT

COUT

PSC

Functional Pin Description

BOOT (Pin 1)

Bootstrap supply for the upper gate driver. Connect the

bootstrap capacitor between BOOT pin and the PHASE

pin. The bootstrap capacitor provides the charge to turn

on the upper MOSFET.

UGATE (Pin 2)

Upper gate driver output. Connect to gate of the high-

side power N-Channel MOSFET. This pin is monitored by

the adaptive shoot-through protection circuitry to

determine when the upper MOSFET is turned off.

GND (Pin 3)

Signal ground for the IC.

LGATE (Pin 4)

Lower gate driver output. Connect to the gate of the low-

side power N-Channel MOSFET. This pin is monitored by

the adaptive shoot-through protection circuitry to determine

when the lower MOSFET is turned off.

VCC (Pin 5)

Connect this pin to a well-decoupled 12V bias supply. It

is also the positive supply for the lower gate driver, LGATE.

FB (Pin 6)

Buck converter feedback voltage. This pin is the inverting

input of the error amplifier. FB senses the switcher output

through an external resistor divider network.

COMP (Pin 7)

Buck converter external compensation. This pin is used

to compensate the control loop of the buck converter.

PHASE (Pin 8)

Connect this pin to the source of the upper MOSFET and

the drain of the lower MOSFET. This pin is monitored by

the adaptive shoot-through protection circuitry to

determine when the upper MOSFET is turned off.

Exposed Pad

Exposed pad should be soldered to PCB board and

connected to GND.

www.richtek.com

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DS8101/A-01 March 2007

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