FSP4054 Datasheet, PDF (1/15 Pages) FOSLINK SEMICONDUCTOR CO.,LTD – Standalone Linear Li-ion Battery Charger with Thermal Regulation

Standalone Linear Li-ion Battery Charger with Thermal Regulation
FSP4054
„ FEATURES
„ GENERAL DESCRIPTION
z Programmable charge current up to 800mA
z No MOSFET, sense resistor or blocking diode
The
FSP4054
is
a
complete
constant-current/constant-voltage linear charger for
required
z Complete linear charger in thin SOT package for
cell lithium-ion batteries. Its Thin SOT23-5L package
and low external component count make the FSP4054
single cell lithium–ion batteries
z Constant-current/constant-voltage operation with
ideally suited for portable applications. Furthermore,
the FSP4054 is specifically designed to work within
thermal regulation to maximize charge rate
USB power specifications.
without risk of overheating
z Charges single cell Li-ion batteries directly from
No external sense resistor is needed, and no blocking
diode is required due to the internal MOSFET
USB port
z Preset 4.2V charge voltage with ±1% accuracy
z Charge current monitor output for gas gauging
z Automatic recharge
z Charge status output pin
z C/10 charge termination
z 25uA supply current in shutdown
z 2.9V trickle charge threshold
z Soft-start limits inrush current
z Space saving ThinSOT23-5L package
architecture. Thermal feedback regulators 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
FSP4054 automatically terminates the charge cycle
when the charge current drops to 1/10^th the
programmed value after the final float voltage is
reached.
When the input supply (wall adapter or USB supply) is
„ APPLICATIONS
z Cellular phones, PDAs
z Bluetooth applications
z Charging docks and Cradles
z MP3 players
removed, the FSP4054 automatically enters a low
current state, dropping the battery drain current to less
than 2uA. The FSP4054 can be put into shutdown
mode, reducing the supply current to 25uA.
Other features include charge current monitor,
undervoltage lockout, automatic recharge and a status
pin to indicate charge termination and the presence of
„ PIN CONFIGURATION
an input voltage.
(Top View)
1
5
2
3
4
„ PIN DESCRIPTION
Pin Number
Pin Name
1
CHRG
2
GND
3
BAT
4
Vcc
5
PROG
Pin Function
Open-drain charge status output
Ground
Charge current output
Positive input supply voltage
Charge current program, Charge current monitor and shutdown pin
„ TYPICAL APPLICATIONS CIRCUITS
600mA single cell Li-ion charger
1/15
2007-7-3