Texas Instruments BQ2158MODULE, BQ2158B-003, BQ2158B-002, BQ2158B-001 Datasheet
Features
ä
Complete and compact lithium-ion pack supervisor
ä
Provides overvoltage, undervoltage, and
overcurrent protection for three or four series
Li-Ion cells
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Combines bq2058 with charge/discharge control
FETs
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High side low on-resistance FETs
ä
Designed for battery pack integration
–
Direct connection for series battery terminals
–
Measures 2.10 X 0.70 inches
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Low standby and operating currents
General Description
The bq2158 provides a complete solution for the supervision of three or four series Li-Ion cells. Designed for battery pack integration, the bq2158 incorporates a bq2058
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 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
2
Customer Name: ___________________________________________________________________________
Contact: _________________________________________ Phone: ______________________________
Address: _________________________________________________________________________________
_________________________________________________________________________________
Sales Contact: ____________________________________ Phone: ______________________________
Number of series cells (3 or 4) ________________________________________
Overvoltage threshold (4.25, 4.30 or 4.35V) ________________________________________
Charge current (3.9A max.) ________________________________________
Discharge current (3.9A max.) ________________________________________
FAE approval: _____________________________________ Date: _______________________________
Table 1. bq2158 Module Configuration
bq2158
Operation
The bq2158 monitors each series element for undervoltage, over-voltage, and over-current conditions. If a
cell falls below V
UV
for t
UVD
, the bq2158 enters into
sleep mode. The bq2158 wakes up and enables discharge
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 bq2158 turns the discharge FET off if the steady state load current exceeds
I
OC
for t
OCD
and turns it back on if the load is removed.
3
FG2158cc.eps
B1P
NC
Load
or
Charger
Three-Cell Configuration
POS
NEG
B1N
B2N
B3N
B4N
B1P
Load
or
Charger
Four-Cell Configuration
POS
NEG
B1N
B2N
B3N
B4N
Note: B1P, B4N, POS, and NEG accomodate a #20 AWG stranded wire.
B1N, B2N, and B3N accomodate a #24 AWG stranded wire.
Figure 1. Module Connection Diagram
Number of Cells On-board bq2058 Configuration
3 cells
BAT1N tied to BAT1P
NSEL = V
SS
4 cells
NSEL = V
CC
Table 2. Pin Connections
bq2158
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