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bq2158
Features
a a
Three or Four Series Cell Li-Ion Pack Supervisor Module
Complete and compact lithium-ion pack supervisor Provides overvoltage, undervoltage, and overcurrent protection for three or four series Li-Ion cells Combines bq2058 with charge/discharge control FETs High side low on-resistance FETs Designed for battery pack integration - - Direct connection for series battery terminals Measures 2.10 X 0.70 inches
a a a
a
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 overcu rre n t c o nd i ti o ns. T he bo a r d p r o v id es d ir ec t 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 information in Table 1.
Pin Descriptions
B1P B1N B2N B3N B4N POS NEG Battery 1 positive input/pack positive Battery 1 negative input Battery 2 negative input Battery 3 negative input Battery 4 negative input Pack positive Pack negative
5/99 B
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bq2158
Table 1. bq2158 Module Configuration
Customer Name: ___________________________________________________________________________ Contact: _________________________________________ Phone: ______________________________
Address: _________________________________________________________________________________ _________________________________________________________________________________ Sales Contact: ____________________________________ 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.) Phone: ______________________________
________________________________________ ________________________________________ ________________________________________ ________________________________________ Date: _______________________________
FAE approval: _____________________________________
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bq2158
Table 2. Pin Connections
Number of Cells On-board bq2058 Configuration BAT1N tied to BAT1P NSEL = VSS
3 cells
4 cells
NSEL = VCC
Operation
The bq2158 monitors each series element for undervoltage, over-voltage, and over-current conditions. If a cell falls below VUV for tUVD, the bq2158 enters into sleep mode. The bq2158 wakes up and enables discharge if a voltage, VCD higher than the battery voltage, is applied across POS and NEG. Charging is disabled if a cell exceeds VOV for tOVD, and can resume when the cell falls below the VCE threshold. The bq2158 turns the discharge FET off if the steady state load current exceeds IOC for tOCD and turns it back on if the load is removed.
B1P NC B1N
POS
B1P B1N Load or Charger
POS
B2N
B2N
Load or Charger
B3N
B3N
B4N
NEG
B4N
NEG
Three-Cell Configuration
Four-Cell Configuration
Note: B1P, B4N, POS, and NEG accomodate a #20 AWG stranded wire. B1N, B2N, and B3N accomodate a #24 AWG stranded wire.
FG2158cc.eps
Figure 1. Module Connection Diagram
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bq2158
bq2158 Schematic
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bq2158 Board
.700
6X .055
.031
0 .055 POS R9 C6
Q3
Q1
LAYER 2
C8 Q2
.915 1.065 D1 NEG B4N
LAYER 1
Q4
TP1O
5
R8
1.440 1.640 1.845 2.045 B3N B2N B1N B1P
2.100
R2 R6 C9 D2 R1 R11 R10 C5 C10 C7
C4 R7 C3 R5
U1
C1 C2 R4 R3
.068
.065
bq2158
bq2158
Absolute Maximum Ratings
Symbol VOP VTR VCHG ICHG TOPR TSTG Note: Parameter Supply voltage (B1P to B4N) Maximum transient voltage (B1P to B4N) Charging voltage (POS to NEG) Continuous charge/discharge current Operating temperature Storage temperature Value 18 32 18 3.9 -30 to +70 -55 to +125 Unit V V V A C C VOP > 6V TA = 25C DC Maximum duration = 1.5s Conditions
Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Functional operation should be limited to the Recommended DC Operating Conditions detailed in this data sheet. Exposure to conditions beyond the operational limits for extended periods of time may affect device reliability.
DC Electrical Characteristics (TA = TOPR)
Symbol VOP ICCA ICCS RON Parameter Operating voltage, B1P to B4N Operating current Sleep current On resistance, B1P to POS Minimum 4.0 Typical 39 0.7 Maximum 18 57 1.5 50 Unit V A A m No load across POS and NEG TA = 25C VOP = 10V Conditions/Notes
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bq2158
DC Thresholds (TA = TOPR)
Symbol VOV VCE VUV IOC tUVD VCD tOVD tOCD Note: Parameter Overvoltage threshold Charge enable voltage Undervoltage limit Overcurrent limit 3.8 Undervoltage delay Charge detect threshold Overvoltage delay Overcurrent delay 950 70 950 12 50% -60, +80 50% 60% A ms mV ms ms TA = 30C TA = 30C TA = 60C TA = 30C Value 4.25 VOV - 100mV 2.25 3.4 Tolerance 50mV 50mV 100mV Unit V V V A TA = 25C Notes
The thresholds above reflect the operation of a bq2158 using the standard bq2058 IC (VOV = 4.25V). Specify other versions of the bq2058 by indicating the appropriate VOV threshold in Table 1.
Data Sheet Revision History
Change No. 1 Note: Page No. 3 Description Table 2 pin connections Nature of Change Clarified onboard bq2058 connection.
Change 1 = May 1999 B changes from July 1996.
Ordering Information
bq2158 B--
Customer Code:
Blank = Sample or Pre-production1 XXX = Customer-specific; assigned by Unitrode2
Package Option:
B = Board-level product
Device:
Three- or Four-Series Cell Li-Ion Supervisor Module Notes: 1. Requires configuration sheet (Table 1) 2. Example production part number: bq2158B-001
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Copyright (c) 1999, Texas Instruments Incorporated

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