RT9231A データシートの表示（PDF） - Richtek Technology

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RT9231A

Advanced PWM and Triple Linear Power Controller

Richtek Technology 

RT9231A

transistors (instead of N-channel MOSFETs) are

employed as pass elements. The voltage at this pin is

monitored for power-on reset (POR) purpose.

GND (Pin 17)

Signal ground for the IC. All voltage levels are

measured with respect to this pin.

DRIVE3 (Pin 18)

Connect this pin to the gate of an external MOSEFT.

This pin provides the drive for the 1.5V regulator’s

pass transistor.

VSEN3 (Pin 19)

Connect this pin to the output of the 1.5V linear

regulator. This pin is monitored for under-voltage

events.

FB (Pin 21)

This pin is connected to the PWM converter’s output

voltage.

VSEN1 (Pin 22)

This pin is connected to the PWM converter’s output

voltage. The PGOOD and OVP comparator circuits use

the signal to report output voltage status and for over-

voltage protection.

OCSET (Pin 23)

Connect a resistor from this pin to the drain of the

respective upper MOSFET. This resistor, an internal

200µA 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.

PGND (Pin 24)

This is the power ground of UGATE. Tie the

synchronous PWM converter’s lower MOSFET source

to this pin.

LGATE (Pin 25)

Connect LGATE to the PWM converter’s lower

MOSFET gate. This pin provides the gate drive for the

lower MOSFET.

PHASE (Pin 26)

Connect the PHASE pin to the PWM converter’s upper

MOSFET source. This pin represents the gate drive

return current path and is used to monitor the voltage

drop across the upper MOSFET for over-current

protection.

UGATE (Pin 27)

Connect UGATE pin to the PWM converter’s upper

MOSFET gate. This pin provides the gate drive for the

upper MOSFET.

VCC (Pin 28)

Provide a 12V bias supply for the IC to this pin. This

pin also provides the gate bias charge for all the

MOSFETs controlled by the IC. The voltage at this pin

monitored for power-on reset (POR) purpose.

DS9231A-02 July 2001

www.richtek.com

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