RT9945 datasheet(3/33 Pages) RICHTEK

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RT9945

DS9945-01 April 2011

www.richtek.com

Pin N o.

Pin Nam e

Pin Function

LDO1 & LDO2 Output Voltage Setting. Directly connect VSYS to pull high, GND

to pull low.

LDO1 & LDO2 Output Voltage Setting. Directly connect VSYS to pull high, GND

to pull low.

PWR_EN

Buck2 & LDO2 Enable Pin from Processor.

FB2

Voltage Feedback 2. FB2 regulates to 0.675V nominal.

PGND2

Buck 2’s Power Ground.

LX2

Inductor connection to the drains of the Internal N-MOSFET and P-MOSFET.

VIN1

This pin must be shorted to VSYS, VIN2, and VIN3. Connect a 10

μF ceramic

capacitor from VIN1 to GND.

LX1

Inductor connection to the drains of the Internal N-MOSFET and P-MOSFET.

PGND1

Buck 1’s Power Ground.

FB1

Voltage Feedback 1. FB1 regulates to 0.6V nominal.

28,29

BATT

Main Battery Supply Input Terminal. This pin delivers charging current and

monitors battery voltage.

DATA

Data Input/ Output for Serial Interface.

CLK

Clock Input for Serial Interface.

PWR_HOLD

Logic low signal from processor to turn-off the PMU.

PWR_ON

Active High Power On/ Off Key Input. This pin has an Internal 2

μA pull-down

current to GND. W hen the push button is closed, It Is shorted to SYS, not

Ground. This input is de-bounced with 320ms (typ).

HP_PWR

Logic High Signals Connection of Hands Free Kit. This pin has an Internal 2

μA

pull-down current to GND. This input is de-bounced with 320ms (typ).

35,36

VSYS

Connect this pin to system with a minimum 22

μF ceramic capacitor to GND.

This pin must be shorted to VIN1, VIN2, and VIN3

PWR_ID

Power Source Input Detection Pin.

38,39

PWR_IN

Power Source Input. Connect a 4.7

μF ceramic capacitor from this pin to GND.

ISETU

USB Charge Current Setting Pin.

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