Standalone Linear Lithium Battery Charger

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3H20N Rev. P001

EC49017

Electrical Characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

PROG Pin Voltage

0.9

1.03

1.1

V

CHRG Pin Output Low Voltage

—

0.6

—

V

Δ V

RECHRG

Recharge Battery Threshold Voltage

—

100

—

mV

Thermal Protection Temperature

—

120

—

°C

Soft-Start Time

—

100

—

µs

Recharge Comparator Filter Time

—

1

—

ms

Termination Comparator Filter Time

—

1000

—

µs

PROG Pin Pull-Up Current

—

1

—

µA

Note 1: Exceeding the absolute maximum rating may damage the device.

Note 2: The device is not guaranteed to function outside its operating rating.

Note 3: Supply current includes PROG pin current (approximately 100µA) but does not include any current delivered to the

battery through the BAT pin (approximately 100mA).

Pin Functions

Pin

Pin Function Description

Pin

Pin Function Description

VCC

Positive Input Supply Voltage. Provides

Power to charger. VCC can range from

3.5 to 6.5V and should be bypassed With

at least a 1uF capacitor.

CHRG

Open-Drain Charge Status Output. When the battery is

charging, the CHRG pin is pulled low by an internal

N-channel MOSFET. When the charge cycle is completed, a

weak pull-down of approximately 20uA is connected to the

CHRG pin, indicating an

“AC present” condition.

GND

Ground

PROG

Charge Current Program, Charge Current Monitor and

shutdown pin

BAT

Charge Current Output. Provides charge

current to the battery and regulates the

final float voltage to 4.22V

CHRGT

Open-Drain Charge Termination Status Output. When

the battery is charging, the CHRGT pin is pulled high

by an external

compenent such as an LED. After

the charging is completed, this pin is pulled low by

internal N-channel MOSFET and it can be used as a

charging termination indicator.