TI BQ2167LB-XXX Li-ion power gaugeâ ¢ module with pack supervisor Datasheet

bq2167
Li-Ion Power Gauge™ Module
with Pack Supervisor
Features
➤
Complete and compact lithium ion gas gauge and
protection solution for three or four series cells
➤
Accurate measurement of available battery
capacity
➤
Provides overvoltage, undervoltage, and
overcurrent protection
➤
Designed for battery pack integration
–
Small size
–
Includes bq2050 and bq2058 ICs
–
On-board charge and discharge control FETs
–
Low operating current for minimal battery drain
➤
High side FET control
➤
Battery capacity available through single-wire
serial port
➤
“L” version includes 5 push-button activated LEDs
to display state-of-charge information
or graphite anode), and the threshold limits. Figure 1
shows how the module connects to the cells.
The bq2167L includes five LEDs to display remaining capacity in 20% increments of the learned capacity. The LEDs are
activated with the onboard push-button switch.
A module development kit is also available for the
bq2167. The bq2167B-KT or the bq2167LB-KT includes
one configured module and the following:
General Description
The bq2167 Power Gauge Module provides a complete and
compact battery management solution for Li-Ion battery
packs. Designed for battery pack integration, the bq2167
combines the bq2050 Power Gauge IC with the bq2058 Supervisor IC on a small printed circuit board. The board includes all the necessary components to accurately monitor
battery capacity and protect the cells from overvoltage, undervoltage, and overcurrent conditions. The board works
with three or four Li-Ion series cells.
1)
An interface board that allows connection to the
serial port of any AT-compatible computer.
2)
Menu driven software to display charge/discharge
activity and to allow user interface to the bq2050
from any standard DOS PC.
Pin Descriptions
The Power Gauge IC uses the on-board sense resistor to
track charge and discharge activity of the battery pack.
Critical battery information can be accessed through the
serial communications port at DQ. The supervisor circuit consists of the bq2058 and two FETs. The bq2058
controls the FETs to protect the batteries during
charge/discharge cycles and short circuit conditions. The
bq2167 provides contacts for the positive and negative
terminals of each battery in the stack. Please refer to
the bq2050 and bq2058 data sheets for the specifics on
the operation of the power gauge and supervisor ICs.
Unitrode configures the bq2167 based on the information requested in Table 1. The configuration defines the
number of series cells, the nominal battery pack capacity, the self-discharge rate, the Li-Ion battery type (coke
5/99 B
1
POS
Pack positive
B1P
BAT1P/Battery 1 positive input
B1N
BAT1N/Battery 1 negative input
B2N
BAT2N/Battery 2 negative input
B3N
BAT3N/Battery 3 negative input
B4N
BAT4N/Battery 4 negative input
ITEST
Overcurrent test input
DQ
Serial communications port
NEG
Pack negative
bq2167
Battery Pack
Cells
B4N
B3N B2N B1N B1P
bq2167
NEG
POS
PACK-
PACK+
Load
Charger
FG2167-1.eps
Figure 1. Module Connection Diagram
Table 1. bq2167 Module Configuration
Customer Name: ___________________________________________________________________________
Contact: _________________________________________
Phone: ______________________________
Address: _________________________________________________________________________________
_________________________________________________________________________________
Sales Contact: ____________________________________
Phone: ______________________________
Number of series cells (3 or 4)
_____________
Coke or graphite cell anode
_____________
Battery pack capacity (mAh)
_____________
Discharge current into load (3.9A max.)
Min. ________ Avg. _________ Max. _________
Charge current (3.9A max)
_____________
Self-discharge compensation (Y/N)
_____________
Overvoltage threshold (4.25, 4.30, or 4.35V)
_____________
LEDs and switch (Y/N)
_____________
FAE approval: ____________________________________
2
Date: _______________________________
bq2167
B1P
NC
B1P
POS
B1N
B1N
Load
or
Charger
B2N
Load
or
Charger
B2N
B3N
B3N
B4N
POS
B4N
NEG
NEG
Four-Cell Configuration
Three-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
3
bq2167
bq2167 Schematic
1
2
3
4
Component values depend on user-provided information in Table 1.
4
bq2167
bq2167 Schematic (Continued)
5
bq2167
bq2167 Board
6
bq2167
Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
Conditions
VOP
Supply voltage (B1P to B4N)
18
V
DC
VTR
Maximum transient voltage (B1P to B4N)
32
V
Maximum duration =
1.5µs
VCHG
Charging voltage (POS to NEG)
18
V
ICHG
Continuous charge/discharge current
3.9
A
TOPR
Operating temperature
0 to +70
°C
TSTG
Storage temperature
-55 to +125
°C
Note:
VOP > 6V
TA = 25°C
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
Parameter
Minimum
Typical
Maximum
Unit
4.0
-
18
V
VOP
Operating voltage, B1P to
B4N
ICCA
Operating current
-
-
350
µA
RON
On resistance, B1P to POS
-
-
50
mΩ
7
Conditions/Notes
TA = 25°C
VOP = 10V
bq2167
DC Thresholds (TA = TOPR)
Symbol
Parameter
Value
Tolerance
Unit
VOV
Overvoltage threshold
4.25
± 50mV
V
VCE
Charge enable voltage
VOV - 100mV
± 50mV
V
VUV
Undervoltage limit
2.25
± 100mV
V
IOC
Overcurrent limit
tUVD
Undervoltage delay
Notes
3.4
A
TA = 25°C
3.8
A
TA = 60°C
TA = 30°C
950
±50%
ms
VCD
Charge detect threshold
70
-60, +80
mV
tOVD
Overvoltage delay
950
±50%
ms
TA = 30°C
tOCD
Overcurrent delay
12
±60%
ms
TA = 30°C
Note:
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.
Page No.
1
All
Note:
Description
From Preliminary to Final
Change 1 = May 1999 B changes from Apr. 1999.
Ordering Information
bq2167
B —
Customer Code:
Blank = Sample or Pre-production1
KT = Evaluation system
XXX = Customer-specific; assigned by Unitrode2
Package Option:
B = Board-level product
LED Option:
L = LEDs plus switch
Blank = No LEDs or switch
Device:
Li-Ion Power Gauge Module with Pack Supervisor
Notes:
1. Requires configuration sheet (Table 1)
8
Nature of Change
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