ACT2801 / ACT2801B
5V/1.5A Backup Battery Pack Manager
FEATURES
• 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
• <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 2.0A Input Current Limit with Prioritized Power
Path to Output
• 5V+/-100mV Output Voltage in Boost Mode
• 1.1MHz/0.55MHz Switching Frequencies
• 2.2uH 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
• Charge Current Foldback at 110°C Die Temperature
• IC Over Temperature Protection at 160°C
• QFN4x4-24 Package
Vbat
APPLICATIONS
• Backup Battery Pack
• Power Bank
• Mobile Power
• Standalone Battery Charger with USB Output
GENERAL DESCRIPTION
ACT2801/ACT2801B is a space-saving and high-
performance low-profile single-chip solution for backup
battery pack and standalone battery charger.
ACT2801/ACT2801B integrates all the functions that a
backup battery pack needs, including switching charger,
boost converter and LED indication.
ACT2801/ACT2801B operates at 1.1MHz for switching
charger and 0.55MHz for boost converter allowing tiny
external inductor and capacitors. ACT2801/ACT2801B
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.
ACT2801/ACT2801B 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.
ACT2801/ACT2801B boost converter steps battery
voltage up to 5V. Boost converter features high
efficiency, constant current regulation, short circuit
protection and over voltage protection.
ACT2801/ACT2801B provides 3.5mA constant currents
to drive 4 LEDs to indicate battery level and charge
status. Battery impedance is compensated for battery
level indication.
Vin
R7
2.7Ω
C1
4.7uF
10V
R5 R6
100k 60k
VI NLED1
LED2
LED3 LED4 BAT
VO UT
RIMC
TH
BLVS
PB
ACT2801
SW
PB
CSP
PG ND
CSN
AGND HZ BTV ILIM IOST ICST
R1 R2 R3 R4
25k 1.5k 97.6k 39k
L1 2.2uH
Rcs
50mΩ
C2
22uF
10V
Vbat
NTC
Vout
C3
22µF
10V
GND
Data Sheet Rev. 10.0, January 20, 2020 | Subject to change without notice 1 of 25
www.qorvo.com
