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Over Temperature Protection

120

100

Detection Delay Time

0.25

Overcharge Voltage Detection

Delay Time

150

240

mS

Overdischarge Voltage Detection

Delay Time

50

80

mS

Overdischarge Current

Detection

Delay Time

10

20

mS

Load Short-Circuiting Detection

Delay Time

T

75

200

uS

Figure 3. Functional Block Diagram

FUNCTIONAL DESCRIPTION

The HM5451 monitors the voltage and

current of a battery and protects it from

being damaged due to overcharge voltage,

overdischarge voltage, overdischarge

current, and short circuit conditions by

disconnecting the battery from the load

or charger. These functions are required in

order to operate the battery cell within

specified limits.

The device requires only one external

capacitor. The MOSFET is integrated and

Normal operating mode

If no exception condition is detected,

charging and discharging can be carried

out freely. This condition is called the

normal operating mode.

Overcharge Condition

- -

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