ACE4054

Fully integrated constant current/constant voltage

Li-ion battery charger

VER 1.2

2

Absolute Maximum Ratings

Parameter

Symbol

Max

Unit

VCC

-0.3 ~6.5

V

PROG

-0.3 ~ VCC+0.3 V

BAT

-0.3 ~ 5

V

CHRG

-0.3 ~ 6.5

V

BAT Short-Circuit Duration

Continuous

 

PROG Pin Current

600

μA

Maximum Junction Temperature

125

℃

Operating Ambient Temperature Range

-40 ~ 85

℃

Storage Temperature Range

-40 ~ 125

℃

Packaging Type

SOT-23-5

5

4

1

2

3

Pin Description

CHRG (Pin 1):Open-Drain Charge Status Output. The CHRG pin outputs low when the battery is

charging.Upon the completion of the charge cycle, a weak pull-down current to the pin

indicates an“AC present” condition. When the ACE4054 detects an under voltage lockout

condition, CHRG is forced high impedance.

GAN (Pin 2):Ground.

BAT (Pin 3):Charge Current Output. This pin provides charge current to the battery and regulates the final

float voltage to 4.2V which is set by an internal precision resistor divider.

VCC (Pin 4):Positive Input Supply. Needs to be bypassed with at least a 1μF capacitor. When input

voltage drops to within 30mV of the BAT pin voltage, the ACE4054 switches to shutdown

mode.

PROG (Pin 5):Program, Monitor the charge current and Shutdown. This pin set to 1V in constant-current

mode. The charge current is programmed by connecting a 1% resistor, RPROG, to GND

pin. The charge current can be calculated using the following formula:

I BAT = ( VPROG / RPROG) · 1000

The PROG pin can also be used to switch the charger to shutdown mode by disconnecting the program

resistor from ground. This results in a 3μA current to pull the PROG pin to a high level shutdown threshold

voltage, thus stop the charging and reduce the supply current to 25μA. This pin is also clamped to

approximately 2.4V. A higher voltage beyond this value will draw currents as high as 1.5mA. Device

normal operation can be resumed by reconnecting the RPROG resistor to ground.

Pin

SOT-23-5

CHRG

1

GND

2

BAT

3

VCC

4

PROG

5