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ME4057 Datasheet Preview

ME4057 Datasheet

1A Lithium Ion Battery Linear Charger

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ME4057
1A Lithium Ion Battery Linear Charger ME4057
General Description
ME4057 is a complete constant-current/constant voltage
linear charger for single cell lithium-ion batteries. With a
thermally enhanced 8-PIN SOP package on the bottom
and low external component count make the ME4057
ideally suited for portable applications. Furthermore the
ME4057 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 PMOSFET
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 ME4057 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 ME4057 automatically enters a low current
state dropping the battery drain current to less than
2μA.The ME4057 can be put into shutdown mode reducing
the supply current to 55μA.
Other features include Battery temperature monitor,
under-voltage lockout, automatic recharge and two status
pins to indicate charge and charge termination.
Features
Protection of battery cell reverse connection
Programmable charge current up to 1A
No MOSFET sense resistor or blocking diode
required
Complete linear Charger in SOP8 Package for
single Cell Lithium-Ion Batteries.
Constant-Current/Constant-Voltage
operation
with thermal regulation to maximize Rate
TyWpiicthaolucthriasrkgoefcoyvcelrehea1t0in0g0.mAh battery
Preset 4.2V charge voltage with ±1% accuracy
Automatic Recharge
Two Status Indication for Charge status, no
battery and battery failure indicators
C/10 charge termination
55μA supply current in shutdown
2.9V trickle current charge threshold
Soft-Start limits inrush current
Battery Temperature Sensing
Available in SOP8-PP package
Typical charge cycle1000mAh battery
Applications
Cellular Telephones
Digital Still Cameras
MP3 Players
Bluetooth Applications
Portable Devices
USB Bus-Powered Chargers
V01
www.microne.com.cn
Page 1 of 18




Microne

ME4057 Datasheet Preview

ME4057 Datasheet

1A Lithium Ion Battery Linear Charger

No Preview Available !

Pin Configuration
ME4057
Pin Assignment
Pin Num. Symbol
Function
Temperature sense input
Connecting TEMP pin to NTC thermistor’s output in Lithium ion battery pack. If TEMP
1 TEMP pins voltage is below 45% or above 80% of supply voltage VCC, this means that
batterys temperature is too low or too high, charging is suspended. The temperature
sense function can be disabled by grounding the TEMP pin.
Constant Charge Current Setting and Charge Current Monitor Pin
The charge current is programmed by connecting a resistor RPROG from this pin to GND.
When in precharge mode, the PROG pins voltage is regulated to 0.1V. When charging
in constant-current mode this pins voltage is regulated to 1V. In all modes during
2 PROG
charging, the voltage on this pin can be used to measure the charge current using the
3
4
5
6
7
8
V01
GND
VCC
BAT
CE
following formula:
Ground
Positive input supply voltage
Provides power to the internal circuit. When VCC drops to within 80mV of the BAT pin
voltage, the ME4057 enters low power sleep mode, dropping IBAT to less than 2μA.
Battery connection Pin
Connect the positive terminal of the battery to this pin. Dropping BAT pins current to
less than 2μA when IC in disable mode or in sleep mode. BAT pin provides charge
current to the battery and provides regulation voltage of 4.2V.
Charge terminated status output
is pulled low by an internal switch to indicate a battery charge terminated; this
means Charge termination. Otherwise
pin is in high impedance state.
Open-Drain charge status output
When the battery is being charged, the
pin is pulled low by an internal switch,
otherwise,
pin is in high impedance state.
Chip enable input
A high input will put the device in the normal operating mode. Pulling the CE pin to low
level will put the ME4057 into disable mode. The CE pin can be driven by TTL or CMOS
logic level.
www.microne.com.cn
Page 2 of 18


Part Number ME4057
Description 1A Lithium Ion Battery Linear Charger
Maker Microne
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ME4057 Datasheet PDF





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