ACT2802/ACT2802B/ACT2802C
Rev 7, 15-Jul-16
5V/2.5A Backup Battery Pack Manager
FEATURES
Dedicated Single Chip Solution for Mobile Power
With Minimal Component Count
5V/2.5A Constant Output Current Limit in Boost
Mode
2.5A Switching Charger Current Limit
Programmable 4.1V to 4.35V Battery Voltage
95% Boost Efficiency (Vbat=4.1V)
Adaptive to 10mA-2400mA Input Sources
Battery Disconnection at Output Short
<10µA Low Battery Leakage Current at HZ
Mode During Storage
Boost Auto Turn-off at No Load and Push
Button Turn-on
Battery Over Current, Over Voltage, Over
Temperature and Short Circuit Protections
Boost Auto Startup with Load Detection
Up to 3.0A Input Current Limit with Prioritized
Power Path to Output
5V+/-100mV Output Voltage in Boost Mode
1.1MHz/0.55MHz Switching Frequencies
2.2uH Inductor and Low Profile Ceramic
Capacitor
4 LEDs Battery Level and Status Indication
Battery Impedance Compensation
Full Cycle of Battery Charge Management
Preconditioning, Fast Charge, Top off and End
of Charge
Charge Current Foldback at 110°C Die
Temperature
IC Over Temperature Protection at 160°C
QFN4x4-24 Package
APPLICATIONS
Backup Battery Pack
Power Bank
Mobile Power
Standalone Battery Charger with USB Output
GENERAL DESCRIPTION
ACT2802/ACT2802B/ACT2802C is a space-saving
and high-performance low-profile single-chip
solution for backup battery pack and standalone
battery charger. ACT2802/ACT2802B/ACT2802C
integrates all the functions that a backup battery
pack needs, including switching charger, boost
converter and LED indication.
ACT2802/ACT2802B/ACT2802C operates at
1.1MHz for switching charger and 0.55MHz for
boost converter allowing tiny external inductor and
capacitors. ACT2802/ACT2802B/ACT2802C
provides a direct power path from input to output
with programmable current limit while providing
power to switching charger. Output has higher
priority than battery charger if the programmed
input current limit is reached.
ACT2802/ACT2802B/ACT2802C charges battery
with full cycle of preconditioning, fast charge with
constant current and constant voltage until end of
charge. The battery charger is thermally regulated
at 110°C with charge current foldback.
ACT2802/ACT2802B/ACT2802C boost converter
steps battery voltage up to 5V. Boost converter
features high efficiency, constant current regulation,
short circuit protection and over voltage protection.
ACT2802/ACT2802B/ACT2802C provides 3.5mA
constant currents to drive 4 LEDs to indicate
battery level and charge status. Battery impedance
is compensated for battery level indication.
Innovative PowerTM
-1-
Boost CC/CV Profile
5.5
VBAT =3.2V
5.0
VBAT =3.7V
4.5
4.0
VBAT =4.1V
3.5
3.0
0
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
Output Current (A)
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