BL4056

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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

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

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

Positive input supply voltage

5

BAT

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.

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 BL4056 into disable mode. The CE pin can be driven by TTL or CMOS

logic level.