RT9230CS datasheet(6/10 Pages) ETC

6 / 10 page

RT9230

www.richtek-ic.com.tw

DS9230-03 July 2001

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.

FB1 (Pin 21)

The FB1 pin is the inverting input of the error

amplifier.

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.

PGND (Pin 24)

This is the power ground of UGATE1, LGATE1, and

UGATE2 connection. Tie the synchronous PWM

converter’s lower MOSFET source to this pin.

LGATE1 (Pin 25)

Connect LGATE to the PWM converter’s lower

MOSFET gate. This pin provides the gate drive for

the lower 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.

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