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AiT Semiconductor
AiT Semiconductor

A4053 Datasheet Preview

A4053 Datasheet

1A LINEAR LI-ION BATTERY CHARGER

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A4053 pdf
AiT Semiconductor Inc.
www.ait-ic.com
A4053
BATTERY MANAGEMENT
1A LINEAR LI-ION BATTERY CHARGER
DESCRIPTION
FEATURES
The A4053 is a complete constant current & constant
voltage linear charger for single cell lithium-ion
batteries. Its P-MSOP package and low external
component count make the A4053 ideally suited for
portable applications. Furthermore, the A4053 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
A4053 automatically terminates the charge cycle
when the charge current drops to 1/10th the
programmed value after the final float voltage is
reached.
When the input supply (wall adapter or USB supply)
is removed, the A4053 automatically enters a low
current state, dropping the battery drain current to
less than 2uA. The A4053 can be put into shutdown
mode, reducing the supply current to 50uA.
Other features include Battery temperature monitor,
under-voltage lockout, automatic recharge and two
status pins to indicate charge and charge termination.
The A4053 is available in P-MSOP8 Package
Programmable Charge Current Up to 1000mA
No MOSFET, Sense Resistor or Blocking Diode
Required
Complete Linear Charger in MSOP 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 with ±1%
Accuracy
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 P-MSOP8 Package
APPLICATION
Cellular Telephones, PDAs, MP3 /MP4 Players
Charging Docks and Cradles
Bluetooth GPS Applications
TYPICAL APPLICATION
ORDERING INFORMATION
Package Type
Part Number
P-MSOP8
MSP8
A4053MSP8R
A4053MSP8VR
Note
R: Tape & Reel
V: Halogen free package
AiT provides all RoHS products,
suffix “ V “ means Halogen free Package
REV2.1
- JUL 2012 RELEASED, SEP 2012 UPDATED -
-1-



AiT Semiconductor
AiT Semiconductor

A4053 Datasheet Preview

A4053 Datasheet

1A LINEAR LI-ION BATTERY CHARGER

No Preview Available !

A4053 pdf
AiT Semiconductor Inc.
www.ait-ic.com
PIN DESCRIPTION
A4053
BATTERY MANAGEMENT
1A LINEAR LI-ION BATTERY CHARGER
Pin #
1
2
3
4
5
6
7
8
Symbol
TEMP
PROG
GND
VCC
BAT
STDBY
CHRG
CE
Top View
Function
Battery temperature detection input. TEMP pin to receive the battery NTC sensor output. If
the TEMP pin voltage is less than the input voltage is greater than 45% or 80% of the input
voltage means the battery temperature is too low or too high, then the charge has been
suspended. If the TEMP direct access GND, battery temperature detection canceled, the
other charged and functioning properly.
Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is
programmed by connecting a 1% resistor, RPROG, to ground. When charging in constant-current
mode, this pin servos to 1V. In all modes, the voltage on this pin can be used to measure the charge
current using the following formula: IBAT = (VPROG/RPROG) •1000. The PROG pin can also be used to
shut down the charger. Disconnecting the program resistor from ground allows a 3uA current to pull
the PROG pin high. When it reaches the 1.21V shutdown threshold voltage, the charger enters
shutdown mode, charging stops and the input supply current drops to 50uA. This pin is also clamped
to approximately 2.4V. Driving this pin to voltages beyond the clamp voltage will draw currents as
high as 1.5mA. Reconnecting RPROG to ground will return the charger to normal operation.
Ground
Positive Input Supply Voltage. Provides power to the charger, VCC can range from 4.25V to
6.5V and should be bypassed with at least a 10uF capacitor. When VCC drops to within
30mV of the BAT pin voltage, the A4051 enters shutdown mode, dropping IBAT to less than
2uA.
Charge Current Output. Provides charge current to the battery and regulates the final float
voltage to 4.2V. An internal precision resistor divider from this pin sets the float voltage
which is disconnected in shutdown mode
The completion of battery charging instructions side. When the battery charge is complete,
STDBY pulled low by internal switches, indicating the completion of charging. In addition,
STDBY pin will be in a high-impedance state.
Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is pulled
low by an internal N-channel MOSFET. When the charge cycle is completed, CHRG pin
will be in a high-impedance state.
Chip enable input High input level would A4051 is in normal working condition; low input
level so that A4051 is prohibited charging status. CE pin can be TTL or CMOS level-level
driver
REV2.1
- JUL 2012 RELEASED, SEP 2012 UPDATED -
-2-


Part Number A4053
Description 1A LINEAR LI-ION BATTERY CHARGER
Maker AiT Semiconductor
Total Page 10 Pages
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