ME4057 Series
1A Lithium Ion Battery Linear Charger
ME4057 Series
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.
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
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
with thermal regulation to maximize Rate
Typical charge cycle（1000mAh battery）
Without risk of overheating.
● Preset 4.2V / 4.34V 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
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 / 4.34V, 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 1/10
th
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.
Applications
●Cellular Telephones
●Digital Still Cameras
●MP3 Players
●Bluetooth Applications
●Portable Devices
●USB Bus-Powered Chargers
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ME4057 Series
Selection Guide
Typical charge cycle
（1000mAh
battery）
Pin Configuration
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ME4057 Series
Pin Assignment
Pin Num.
Symbol
Function
Temperature sense input
Connecting TEMP pin to NTC thermistor’s output in Lithium ion battery pack. If TEMP
pin’s voltage is below 45% or above 80% of supply voltage V
CC
, this means that
battery’s 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 R
PROG
from this pin to GND.
When in precharge mode, the PROG pin’s voltage is regulated to 0.1V. When charging
in constant-current mode this pin’s voltage is regulated to 1V. In all modes during
charging, the voltage on this pin can be used to measure the charge current using the
following formula:
I
BAT
=
3
4
GND
V
CC
Ground
Positive input supply voltage
Provides power to the internal circuit. When V
CC
drops to within 80mV of the BAT pin
voltage, the ME4057 enters low power sleep mode, dropping I
BAT
to less than 2μA.
Battery connection Pin
Connect the positive terminal of the battery to this pin. Dropping BAT pin’s 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 /4.34V.
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.
1
TEMP
2
PROG
V
PROG
*1100
R
PROG
5
BAT
6
7
8
CE
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ME4057 Series
Block Diagram
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ME4057 Series
Absolute Maximum Ratings
Parameter
Input supply voltage : V
CC
PROG pin voltage
BAT pin voltage
TEMP pin voltage
pin voltage
pin voltage
CE pin voltage
BAT pin current
PROG pin current
Maximum junction temperature
Operating ambient temperature :T
opa
Storage temperature :T
str
Soldering temperature and time
Rating
-0.3½8
-0.3½VCC+0.3
-0.3½7
-0.3½10
-0.3½10
-0.3½10
-0.3½10
1200
1200
145
-40½85
-65½125
+260（Recommended 10S）
Unit
V
V
V
V
V
V
V
mA
μA
℃
℃
℃
℃
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.
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