RT5021 datasheet(5/67 Pages) RICHTEK

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RT5021

DS5021-01 April 2013

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Pin No.

Pin Name

Pin Function

FB3

Feedback Input Pin of CH3.

Temperature Sense Input. The TS pin connects to a battery’s thermistor to

determine if the battery is too hot or too cold to charge. If the battery’s

temperature is out of range, charging is paused until it re-enters the valid range.

TS also detects whether the battery (with NTC) is present or not.

Power Output Pin of 3.3V Buffer for Battery Temperature Sensing.

LX3

Switch Node of CH3.

PVD3

Power Input Pin of CH3.

33, 34

BAT

Charger Output for Battery.

35, 36

SYS

Power Output for System. Connect this pin to System with a minimum 10

μF

ceramic capacitor to GND.

VIN

Supply Voltage Input.

USB D+ Input for Charger Type Detection.

USB D- Input for Charger Type Detection.

VRTC

RTC LDO Power Output Pin.

41 (Exposed pad)

GND

Exposed PAD Should be Soldered to PCB and Connected to GND.

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