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OCP8020 Datasheet

Standalone Linear Lithium Battery Charger

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OCP8020 pdf
„ General Description
OCP8020 is a complete constant-current and
constant-voltage linear charger for single cell
lithium-ion and Lithium-Polymer batteries. Its
SOT23-5L Package and low external component count
make OCP8020 ideally suited for portable applications.
Furthermore, the OCP8020 is specifically designed to
work within USB power specification. At the same time,
OCP8020 can also be used in the standalone
lithium-ion and Lithium-polymer battery charger.
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
OCP8020 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 OCP8020 automatically enters a low
current stage, dropping the battery drain current to less
than 2µA. The OCP8020 can be put into shutdown
mode, reducing the supply current to 25µA.
Other features include charge current monitor,
undervoltage lockout, automatic recharge and a status
pin to indicate termination and the presence of an input
voltage.
OCP8020
Standalone Linear Lithium Battery Charger
„ Features
z Programmable Charge Current Up to 800mA
z No MOSFET, Sense Resistor or Blocking Diode
Required
z Constant-Current/Constant-Voltage Operation
with Thermal Protection to Maximize Charge Rate
without Risk of Overheating
z Charges Single Cell Li-Ion Batteries Directly from
USB Port
z Press 4.2V Charge Voltage with ± 1% Accuracy
z 25µA. Supply Current in Shutdown
z 2.9V Trickle Charge Threshold
z Available Without Trickle Charge
z Soft-Start Limits Inrush Current
z Available in 5-pin SOT23 Package
„ Applications
z Cellular Telephones, PDA’s, MP3 Players
z Charging Docks and Cradles
z Bluetooth Applications
„ Pin Configuration
(Top View)
CHRG 1
GND 2
BAT 3
5 PROG
4 VCC
„ Block Diagram
www.DataSheet4U.net
120
TDIE
TA
CA
SHDN
CHRG 1
STANDBY
VCC
4
1x
C1
C2+
-
MA 5µA
VA+
-
R3
1V
R4
0.1V
R5
REF
1.21V
1000x
3 BAT
R1
R2
TO BAT
C3+ 2.9V
-
5
PROG
Page1 - 5
3µA
VCC
2
GND
Rev. 1.0 Jul. 25, 2006
www.micro-bridge.com
Orient Chip
Orient Chip



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