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RT9228

Advanced PWM and Dual Fixed Linear Power Controller

Richtek Technology 

RT9228

PGND (Pin 21)

This is the power ground of UGATE1 and LGATE1. Tie the

PWM converter's lower MOSFET source to this pin.

LGATE1 (Pin 22)

Connect LGATE1 to the PWM converter's lower MOSFET

gate. This pin provides the gate drive for the lower

MOSFET.

An over-current trip cycles the soft-start function.

Sustaining an over-current for 2 soft-start intervals shuts

down the controller.

PHASE1 (Pin 23)

Connect the PHASE1 pin to the PWM converter's upper

MOSFET source. This pin is used to monitor the voltage

drop across the upper MOSFET for over-current

protection.

UGATE1 (Pin 24)

Connect UGATE pin to the PWM converter's upper

MOSFET gate. This pin provides the gate drive for the

upper MOSFET.

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DS9228-06 March 2007

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