ACT4503YH-T View Datasheet(PDF) - Unspecified
Part Name
Description
Manufacturer
ACT4503YH-T Datasheet PDF : 55 Pages
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Input Voltage
4.5-5.5V
ACT2801 5V/1A Smart Power Bank
Output Voltage
5.0V
Charge Current
1A
Boost Output
1.4A
Efficiency
95%@1.0A@VBAT=4.2V
Topology
Buck/Boost
L=37.2mm
W=15.5mm
Design Features
Dedicated Single Chip Solution for Mobile Power
Programmable up to 5V/2.1A Input Current
Programmable up to 5V/1.5A Output Current
Programmable up to 1.5A Switching Charge Current
Pogrammable 4.1V to 4.35V Battery Voltage
Prioritized Power Path from Input to Output
2.2MHz/1.1MHz Switching Frequencies
4LEDs Battery Level and Status Indication
<10µA Battery Low Battery Leakage Current
No Load Shutdown and Push Button Turn-on
Battery Impedance Compensation
Battery Over Current, Over Voltage, Over Temperature and
Short Circuit Protections
Charge Current Foldback at 110°C Die Temperature
IC Over Temperature Protection
Operation and Application
ACT2801 is a space-saving and high-performance low-
profile single-chip solution for backup battery pack and
standalone battery charger. ACT2801 integrates all the
functions that backup battery packs need, including
switching charger, Boost converter and LED indication.
ACT2801 operates at 2.2MHz/1.1MHz for switching
charger and 1.1MHz/0.55MHz for Boost converter al-
lowing tiny external inductor and capacitors. ACT2801
provides a direct power path from input to output with
programmable current limit while providing power to
switching charger. Output has higher priority than bat-
tery charger if the programmed input current limit is
reached.
ACT2801 charges battery with full cycle of precondition-
ing, fast charge with constant current and constant volt-
age until end of charge. The battery charger is thermally
regulated at 110°C with charge current foldback.
ACT2801 Boost converter steps battery voltage up to
5V. Boost converter features high efficiency, constant
current regulation, short circuit protection and over
voltage protection.
ACT2801 provides 3.5mA constant currents to drive 4
LEDs to indicate battery level and charging status. Bat-
tery impedance is compensated at battery level indica-
tion.
Schematic
Boost Output V/I Profile
R12
HZ
PB
PB
R13
Input USB
+
D-
D+
-
+
D-
D+
-
Output USB
R11
C12
R10
C3
C11
AGND
nPG
R1
ILIM
VIN
D2
C8
R14
Q1
C4
ACT2801
LED1
R5
BTV
R4
ICST
R3
IOST
CSN
C6
CSP
C2
R15 C14
D1
R2
L1
R9
C7
C5
BAT
5
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