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Over Temperature Protection

120

100

Detection Delay Time

0.25

Overcharge Voltage Detection

Delay Time

130

180

mS

Overdischarge Voltage Detection

Delay Time

40

60

mS

Overdischarge Current 1 Detection

Delay Time

6

10

mS

Load Short-Circuiting Detection

Delay Time

T

140

240

uS

Note:* ---

The parameter is guaranteed by design.

Figure 3. Functional Block Diagram

FUNCTIONAL DESCRIPTION

The HM9901 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

HM9901