General Description Features

Typical charge cycle(1000mAh battery)

Applications

Typical charge cycle(1000mAh battery)

●Cellular Telephones

●Digital Still Cameras

●MP3 Players

●Bluetooth Applications

●Portable Devices

●USB Bus-Powered Chargers

ME4056 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 ME4056

ideally suited for portable applications. Furthermore the

ME4056 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 ME4056 automatically

terminates the charge cycle when the charge current 0s

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 ME4056 automatically enters a low current

state 0ping the battery drain current to less than

2μA.The ME4056 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.

●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

Without risk of overheating.

● 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

Pin Configuration

Pin Assignment

Pin Num. Symbol Function

1 VCC

Positive input supply voltage

Provides power to the internal circuit. When VCC 0s to within 80mV of the BAT pin

voltage, the ME4056 enters low power sleep mode, 0ping IBAT to less than 2μA.

2 GND Ground

3 PROG

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 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:

4 TEMP

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 VCC, 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.

5 CE

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 ME4056 into disable mode. The CE pin can be driven by TTL or CMOS

logic level.

6

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.

7

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.

8 BAT

Battery connection Pin

Connect the positive terminal of the battery to this pin. 0ping 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.

Block Diagram

Absolute Maximum Ratings

Parameter Rating Unit

Input supply voltage : VCC -0.3~8 V

PROG pin voltage -0.3~VCC+0.3 V

BAT pin voltage -0.3~7 V

TEMP pin voltage -0.3~10 V

pin voltage -0.3~10 V

pin voltage -0.3~10 V

CE pin voltage -0.3~10 V

BAT pin current 1200 mA

PROG pin current 1200 μA

Maximum junction temperature 145 ℃

Operating ambient temperature :Topa -40~85 ℃

Storage temperature :Tstr -65~125 ℃

Soldering temperature and time +260(Recommended 10S) ℃

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.

Electrical Characteristics

Symbol Parameter Condition Min Typ. Max Unit

VCC Input supply voltage ● 4.0 5.0 8.0 V

ICC -IBAT static current

●Charge mode, RPROG=1.3K - 150 500 μA

●Standby mode(charge end) - 55 100 μA

●Shutdown mode(RPROG not

connected, VCCVHIGH , it indicates that the battery temperature is too high or too low and the charge cycle is

suspended. When VTEMP is between VLOW and VHIGH, charge cycle resumes. The battery temperature sense

function can be disabled by connecting TEMP pin to GND.

Selecting R1 and R2

The values of R1 and R2 in the application circuit can be determined according to the assumed temperature

monitor range and thermistor’s values. The Follows is an example: Assume temperature monitor range is TL~TH,

( TL

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