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BQ2058SN-C5TR Datasheet(PDF) 4 Page - Texas Instruments

Part # BQ2058SN-C5TR
Description  Lithium Ion Pack Supervisor for 3- and 4-Cell Packs
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

BQ2058SN-C5TR Datasheet(HTML) 4 Page - Texas Instruments

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Functional Description
Figure 1 is a block diagram outlining the major compo-
nents of the bq2058. Figure 2 shows a 3- or 4-cell pack
supervisor circuit. The following sections detail the vari-
ous functional aspects of the bq2058.
Thresholds
The bq2058 monitors the lithium ion pack for the condi-
tions listed below. Shown with these conditions are the
respective thresholds used to determine if that condition
exists:
I
Overvoltage (VOV)
I
Undervoltage (VUV)
I
Overcurrent (VOCH,VOCL)
I
Charge Enable (VCE)
I
Charge Detect (VCD)
The bq2058 samples a cell every 40ms (typical). Every
sample is a fully differential measurement of each cell.
During this sample period, the bq2058 compares the
measurements with these thresholds to determine if any
of the these conditions exist: VOV,VUV, and VCE.
Overcurrent and charge detect are conditions that are
not sampled, but are continuously monitored.
Initialization
On initial power-up, such as connecting the battery pack
for the first time to the bq2058, the bq2058 enters the
low-power sleep mode, disabling the DSG output. It is
recommended that a top to bottom cell connection
be made at pack assembly for proper initializa-
tion. A charging supply must be applied to the bq2058
circuit to enable the pack. See Low-Power Sleep Mode
and Charge Detect sections.
4
bq2058
POS
Q1
Si4435DY
C6
0.1uF
C8
0.1uF
Q2
Si4435DY
Q4
ZVP3306F
R2
6.98K
* See note 1.
D1
BAT54
* See note 2.
Notes:
1. For automatic short circuit recovery.
B1P to B1N for 3-cells.
2. Remove R11 for 4-cell. Remove R10 and connect
B1P
R3
10K
C1
0.001uF
CSH
10
VCC
11
BAT1P
9
BAT1N
8
BAT2N
7
BAT3N
6
BAT4N
5
VSS
3
CSL
4
OVD
13
OCD
12
UVD
14
DSG
16
CHG
1
CTL
2
NSEL
15
U1
bq2058
R10
0 Ohm
4-Cell
C9
0.1uF
R11
0 Ohm
3-Cell
C7
0.01uF
C5
0.1uF
C10
0.1uF
R6
100K
R9
1M
Q3
2N7002
TP1
B1N
B2N
B3N
B4N
R4
10K
R5
10K
R7
10K
R8
10K
C2
0.001uF
C3
0.001uF
C4
0.001uF
R1
2.7K
NEG
Figure 2. 3- or 4-Cell Li-Ion Battery Pack Supervisor


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