Texas Instruments BQ2158TMODULE, BQ2158TB-002, BQ2158TB-001 Datasheet
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 supervision of two series Li-Ion cells. Designed for battery
pack integration, the bq2158T incorporates a bq2058T
Pack Supervisor, two FETs, and all other components required to monitor overvoltage, undervoltage, and overcurrent 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
4/99
2
Customer Name: ___________________________________________________________________________
Contact: _________________________________________ Phone: ______________________________
Address: _________________________________________________________________________________
_________________________________________________________________________________
Sales Contact: ____________________________________ Phone: ______________________________
Overvoltage threshold (4.25V) ________________________________________
Charge current (3.8A max.) ________________________________________
Discharge current (3.8A max.) ________________________________________
FAE approval: ____________________________________ Date:________________________________
Table 1. bq2158T Module Configuration
bq2158T
Preliminary
Operation
The bq2158T monitors each series element for undervoltage, over-voltage, and over-current conditions. If a
cell falls below V
UV
for t
UVD
, the bq2158T enters into
sleep mode. The bq2158T wakes up and enables dis
-
charge if a voltage, V
CD
higher than the battery voltage,
is applied across POS and NEG. Charging is disabled if
a cell exceeds V
OV
for t
OVD
, and can resume when the
cell falls below the V
CE
threshold. The bq2158T turns
the discharge FET off if the steady state load current ex
-
ceeds I
OC
for t
OCD
and turns it back on if the load is re
-
moved.
3
FG2158Tcd.eps
Load
or
Charger
POS
NEG
B1P
B1N
B2N
Note: B1P, B2N, POS, and NEG accomodate a #20 AWG stranded wire.
B1N accomodates a #24 AWG stranded wire.
Figure 1. Module Connection Diagram
Preliminary
bq2158T
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