A4055
BATTERY MANAGEMENT
AiT Semiconductor Inc.
www.ait-ic.com
800mA STANDALONE LINEAR LI-ION BATTERY CHARGER
DESCRIPTION
FEATURES
The A4055 is
a
complete constant-current
/
Programmable Charge Current Up to 800mA
No MOSFET, Sense Resistor or Blocking Diode
Required
constant-voltage linear charger for single cell
lithium-Ion batteries. No external sense resistor is
needed, and no blocking diode is required due to the
internal MOSFET architecture. Thermal feedback
regulates the charge current to limit the die
temperature during high power operation or high
ambient temperature. The charge voltage is fixed at
4.2V, and the charge current can be programmed
Preset 4.2V Charge Voltage with ±1% Accuracy
Charge Current Monitor Output for Gas Gauging
Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating
Charges Single Cell Li-Ion Batteries directly
from USB Port
externally with
a
single resistor. The A4055
automatically terminates the charge cycle when the
charge current drops to 1/10 the programmed value
after the final float voltage is reached.
Over-Voltage Protect
When the input supply (wall adapter or USB supply)
is removed, the A4055 automatically enters a low
current state, dropping the battery drain current to
less than 2μA. The A4055 can be put into shutdown
mode, reducing the supply current to 25μA. Other
Automatic Recharge
Charge Status Output Pin
C/10 Charge Termination
25μA Supply Current in Shutdown
2.9V Trickle Charge Threshold
Soft-Start Limits Inrush Current
Available in SOT-25 Package
features
include
charge
current
monitor,
under-voltage lockout, automatic recharge and a
status pin to indicate charge termination and the
presence of an input voltage.
The A4055 is available in SOT-25 Package
APPLICATION
Cellular and Smart Phones
Charging Docks and Cradles
Blue Tooth Applications
PDAs
ORDERING INFORMATION
MP3/MP4/MP5 Players
Package Type
SOT-25
Part Number
A4055E5R
A4055E5VR
E5
TYPICAL APPLICATION
SPQ: 3,000pcs/Reel
V: Halogen free package
R: Tape & Reel
Note
AiT provides all RoHS products
600mA Application Circuit
REV1.2
- OCT 2011 RELEASED, SEP 2018 UPDATED -
- 1 -