ACE4704

Fully 5A, 4cell Standalone Li-ion Battery Charger

VER 1.2

5

Oscillator

Switching Frequency

fosc

240

300

360

kHZ

Maximum Duty Cycle

Dmax

94

%

Sleep Mode

Sleep Mode Threshold

0.06

0.1

0.14

V

0.1

0.14

0.18

0.18

0.23

0.28

Sleep mode Release

Threshold (measure

0.26

0.32

0.39

V

0.32

0.42

0.52

0.38

0.47

0.58

DRV Pin

VH

60

mV

VL

5

6.5

8

V

Rise Time

Cload=2nF, 10% to

90%

30

40

65

ns

Fall Time

Cload=2nF, 90% to

10%

30

40

65

ns

Detailed Description

The ACE4704 is a constant current, constant voltage Li-Ion battery charger controller that adopts PWM

across the CSP and BAT pins. The final battery regulation voltage in constant voltage mode is internally

set to 16.8V for ACE4704 with 1% accuracy.

A charge cycle begins when the voltage at the VCC pin rises above the UVLO level and is greater than

the charger goes into trickle charge mode. The trickle charge current is internally set to 15%(Typical) of

the full-scale current. When the battery voltage exceeds 11.2V, the charger goes into the full-scale

constant current charge mode. In constant current mode, the charge current is set by the external sense

battery voltage approaches the regulation voltage, the charger goes into constant voltage mode, and the

charge current will start to decrease. When the charge current drops to a level that is set by the resistor at

EOC pin, the charge cycle is terminated, the DRV pin is pulled up to VCC, and an internal comparator

turns off the internal pull-down N-channel MOSFET at the CHRG pin to indicate that the charge cycle is

terminated. During the charge cycle termination status, another internal pull-down N-channel MOSFET at

the DONE pin is turned on to indicate the termination status.

To restart the charge cycle, just remove and reapply the input voltage. Also, a new charge cycle will

begin if the battery voltage drops below the recharge threshold voltage of 16V.

When the input voltage is not present, the charger goes into sleep mode.

A 10kΩ NTC (negative temperature coefficient) thermistor can be connected from the TEMP pin to

ground for battery temperature qualification. The charge cycle is suspended if the battery’s temperature is

outside of the acceptable range.