Features

ä Complete and compact lithium-ion pack supervisor

ä Provides overvoltage, undervoltage, and

overcurrent protection for two series Li-Ion cells

ä Combines bq2058T with charge/discharge control

FETs

ä Low side low on-resistance FETs

ä Designed for battery pack integration

–

Direct connection for series battery terminals

–

Measures 1.70 X 0.70 inches

ä Low standby and operating currents

General Description

The bq2158T provides a complete solution for the super-

vision of two series Li-Ion cells. Designed for battery

pack integration, the bq2158T incorporates a bq2058T

Pack Supervisor, two FETs, and all other components re-

quired to monitor overvoltage, undervoltage, and over-

current conditions.

The board provides direct

connections for the negative and positive terminals of

each cell. See Figure 1. Please refer to the bq2058T

data sheet for specific information on the operation of

the bq2058T.

Unitrode configures the bq2158T based on the informa-

tion in Table 1.

Pin Descriptions

B1P

Battery 1 positive input

B1N

Battery 1 negative input

B2N

Battery 2 negative input

POS

Pack positive

NEG

Pack negative

1

Two Series Cell

Li-Ion Pack Supervisor Module

Preliminary

bq2158T

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