XA4246 CHARGER Datasheet

XA4246 Datasheet, PDF, Equivalent


Part Number

XA4246

Description

STANDALONE LINEAR LI-ION BATTERY CHARGER

Manufacture

XINNA SEMI

Total Page 9 Pages
Datasheet
Download XA4246 Datasheet


XA4246
XA4246
STANDALONE LINEAR LI-ION BATTERY CHARGER
WITH THERMAL REGULATION IN THINSOT
DESCRIPTION
The XA4246 is a complete constant-current/constant-voltage linear charger for single cell lithium-ion
batteries. Its ThinSOT package and low external component count make the XA4246 ideally suited for
portable applications. Furthermore, the XA4246 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 XA4246
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 XA4246 automatically enters a
low current state, dropping the battery drain current to less than 2A. The XA4246 can be put into
shutdown mode, reducing the supply current to 25A.
Other 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.
FEATURES
Programmable Charge Current Up to 800mA
No MOSFET, Sense Resistor or Blocking Diode Required
Complete Linear Charger in ThinSOT 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 Status Output Pin
C/10 Charge Termination
25A Supply Current in Shutdown
2.9V Trickle Charge Threshold (XA4246 )
Soft-Start Limits Inrush Current
Available in 5-Lead SOT-23 Package
APPLICATIONS
Cellular Telephones, PDAs, MP3 Players
Charging Docks and Cradles
Bluetooth Applications
PACKAGE
SOT-23-5
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XA4246
BLOCK DIAGRAM
XA4246
Figure 1
ABSOLUTE MAXIMUM RATINGS
PARAMETER
Input Supply Voltage
PROG pin Voltage
BAT pin Voltage
CHAG pin Voltage
BAT pin Current
SYMBOL
Vcc
Vprog
Vbat
Vchrg
Ibat
MAXIMUM RATING
VSS -0.3 VSS +10
VSS-0.3Vcc+0.3
Vss-0.37
VSS -0.3 VSS +10
800
UNIT
V
mA
PROG pin Current
Iprog
800 uA
Operating Ambient Temperature
Storage Temperature
Topa
Tstr
-40+85
-65+125
°C
Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical
damage. These values must therefore not be exceeded under any conditions.
www.szxinna.com


Features XA4246 STANDALONE LINEAR LI-ION BATTERY CHARGER WITH THERMAL REGULATION IN THIN SOT ■ DESCRIPTION The XA4246 is a com plete constant-current/constant-voltage linear charger for single cell lithium -ion batteries. Its ThinSOT package and low external component count make the XA4246 ideally suited for portable appl ications. Furthermore, the XA4246 is sp ecifically designed to work within USB power specifications. No external sense resistor is needed, and no blocking di ode is required due to the internal MOS FET architecture. Thermal feedback regu lates the charge current to limit the d ie temperature during high power operat ion or high ambient temperature. The ch arge voltage is fixed at 4.2V, and the charge current can be programmed extern ally with a single resistor. The XA4246 automatically terminates the charge cy cle when the charge current drops to 1/ 10th the programmed value after the fin al float voltage is reached. When the i nput supply (wall adapter or USB supply) is removed, the XA4246.
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