General General Description Description
The1056isacompleteconstantcurrent&constant
voltage linear charger for single cell lithium-ion batteries.
Its SOP/MSOP package and low external component
countmakethe1056ideallysuitedforportable
applications.Furthermore,the1056isspecifically
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
1056automaticallyterminatesthechargecyclewhen
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,the1056automaticallyentersalowcurrent
state, dropping the battery drain current to less than 2uA.
The1056canbeputintoshutdownmode,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.
Applications
Using Using SOP8/MSOP8 SOP8/MSOP8 SOP8/MSOP8 package package
1A1A Linear Linear Linear Li-Ion Li-Ion Li-Ion Battery Battery Battery Charger Charger
Features
? Programmable Charge Current Up to 1000mA
? No MOSFET, Sense Resistor or Blocking Diode
Required
? Complete Linear Charger in SOP/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 SOP8-P
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