A4051
BATTERY MANAGEMENT
AiT Semiconductor Inc.
www.ait-ic.com
1A LINEAR LI-ION BATTERY CHARGER
DESCRIPTION
FEATURES
The A4051 is a complete constant current & constant
voltage linear charger for single cell lithium-ion
batteries. Its PSOP package and low external
component count make the A4051 ideally suited for
portable applications. Furthermore, the A4051 is
specifically designed to work within USB power
specifications.
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 externally with a single resistor. The
A4051 automatically terminates the charge cycle
when the charge current drops to 1/10th the
programmed value after the final float voltage is
reached.
Programmable Charge Current Up to 1000mA
No MOSFET, Sense Resistor or Blocking Diode
Required
Complete Linear Charger in PSOP Package for
single Cell Lithium-Ion Batteries
Constant-Current/Constant-Voltage Operation
with Thermal Regulation to Maximize Charge
Rate Without Risk of Overheating
Charges Single Cell Li-Ion Batteries Directly
from USB Port
Preset 4.2V Charge Voltage
Charge Current Monitor Output for Gas Gauging
Automatic Recharge
Charge state pairs of output, no battery and fault
status display
C/10 Charge Termination
50uA Supply Current in Shutdown
2.9V Trickle Charge Threshold
Soft-Start Limits Inrush Current
Battery temperature monitoring function
Available in PSOP8 Package
When the input supply (wall adapter or USB supply)
is removed, the A4051 automatically enters a low
current state, dropping the battery drain current to
less than 2uA. The A4051 can be put into shutdown
mode, reducing the supply current to 50uA.
APPLICATION
Other features include Battery temperature monitor,
under-voltage lockout, automatic recharge and two
status pins to indicate charge and charge termination.
Cellular Telephones, PDAs, MP3 /MP4 Players
Charging Docks and Cradles
Bluetooth 、GPS Applications
The A4051 is available in PSOP8 Package
TYPICAL APPLICATION
ORDERING INFORMATION
Package Type
Part Number
A4051MP8R
A4051MP8VR
PSOP8
SPQ: 4,000pcs/Reel
MP8
V: Halogen free package
R: Tape & Reel
Note
AiT provides all RoHS products,
REV1.3
- JUN 2010 RELEASED, APR 2017 UPDATED -
- 1 -
AITSEMI [ AiT Semiconductor ]
