Features
c228 Complete and compact lithium-ion pack supervisor
c228 Provides overvoltage, undervoltage, and
overcurrent protection for three or four series
Li-Ion cells
c228 Combines bq2058 with charge/discharge control
FETs
c228 High side low on-resistance FETs
c228 Designed for battery pack integration
– Direct connection for series battery terminals
– Measures 2.10 X 0.70 inches
c228 Low standby and operating currents
General Description
The bq2158 provides a complete solution for the supervi-
sion of three or four series Li-Ion cells. Designed for bat-
tery pack integration, the bq2158 incorporates a bq2058
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 bq2058 data
sheet for specific information on the operation of the
bq2058.
Unitrode configures the bq2158 based on the informa-
tion in Table 1.
Pin Descriptions
B1P Battery 1 positive input/pack positive
B1N Battery 1 negative input
B2N Battery 2 negative input
B3N Battery 3 negative input
B4N Battery 4 negative input
POS Pack positive
NEG Pack negative
1
Three or Four Series Cell
Li-Ion Pack Supervisor Module
bq2158
5/99 B