ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
5V/1.5A Backup Battery Pack Manager
FEATURES
APPLICATIONS
Backup Battery Pack
Power Bank
Mobile Power
Standalone Battery Charger with USB Output
Dedicated Single Chip Solution for Mobile Power
With Minimal Component Count
5V/1.5A Constant Output Current Limit in Boost
Mode
1.5A Switching Charger 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
GENERAL DESCRIPTION
ACT2801/ACT2801B/ACT2801C is a space-saving
and high-performance low-profile single-chip
solution for backup battery pack and standalone
battery charger. ACT2801/ACT2801B/ACT2801C
integrates all the functions that a backup battery
pack needs, including switching charger, boost
converter and LED indication.
<10µA Low Battery Leakage Current at HZ
Mode During Storage
Boost Auto Turn-off at No Load and Push
Button Turn-on
ACT2801/ACT2801B/ACT2801C
operates
at
Battery Over Current, Over Voltage, Over
1.1MHz for switching charger and 0.55MHz for
boost converter allowing tiny external inductor and
Temperature and Short Circuit Protections
capacitors.
ACT2801/ACT2801B/ACT2801C
Boost Auto Startup with Load Detection
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.
Up to 2.0A Input Current Limit with Prioritized
Power Path to Output
5V+/-100mV Output Voltage in Boost Mode
1.1MHz/0.55MHz Switching Frequencies
ACT2801/ACT2801B/ACT2801C 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.
2.2uH SMD 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
ACT2801/ACT2801B/ACT2801C boost converter
steps battery voltage up to 5V. Boost converter
features high efficiency, constant current regulation,
short circuit protection and over voltage protection.
Charge Current Foldback at 110°C Die
Temperature
ACT2801/ACT2801B/ACT2801C provides 3.5mA
constant currents to drive 4 LEDs to indicate
battery level and charge status. Battery impedance
is compensated for battery level indication.
IC Over Temperature Protection at 160°C
QFN4x4-24 Package
Vbat
Boost CC/CV Curve
5.5
VBAT =3.7V
5.0
Vin
Vout
LED1 LED2 LED3
LED4 BAT
VOUT
VBAT =3.2V
VIN
RIMC
BLVS
TH
SW
4.5
4.0
Vbat
ACT2801
PB
L1 2.2uH
Rcs
50mΩ
R7
2.7Ω
PB
CSP
C3
22µF
10V
C1
4.7uF
10V
CSN
PGND
VBAT =4.1V
ILIM
AGND HZ BTV
IOST ICST
NTC
3.5
C2
22uF
10V
R3
R4
97.6k 39k
R1
R2
R5
100k
R6
60k
25k 1.5k
3.0
0
200
400
600
800
1000
1200
1400
GND
Output Current (mA)
Innovative PowerTM
- 1 -
www.active-semi.com
Copyright © 2015-2017 Active-Semi, Inc.