ME4057

V01

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Pin Configuration

Pin Assignment

Pin Num.

Symbol

Function

1

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 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.

2

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:

3

GND

Ground

4

VCC

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.

5

BAT

Battery connection Pin

Connect the positive terminal of the battery to this pin. Dropping BAT pin

’s current to

less than 2

μA when IC in disable mode or in sleep mode. BAT pin provides charge

current to the battery and provides regulation voltage of 4.2V.

6

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.

7

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.

8

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 ME4057 into disable mode. The CE pin can be driven by TTL or CMOS

logic level.