BQ29400_16 Datasheet, PDF (5/16 Pages) Texas Instruments – VOLTAGE PROTECTION

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Not Recommended for New Designs:
bq29400, bq29400A, bq29405
bq29400, bq29400A
bq29401, bq29405
SLUS568C – JULY 2003 – REVISED SEPTEMBER 2005
ƪ ƫ 1.2 V C(DELAY)
td +
ICD
ƪtd ƫ ICD
C(DELAY) + _{1.2 V}
Where I_(CD) = CD current source = 0.2 µA
V_(PROTECT)
Cell Voltage
(VCn - VC(n-1),
VC4 - GND)
CD
1.2 V
V_(PROTECT) - V_hys
t_DELAY
OUT
t_d = (1.2 V x C_DELAY)/I_CD
Figure 2. Timing for Overvoltage Sensing
V_CC
vs
V_O(H) (I_O(H) = 0mA)
8
T_A = 855C
7
6 ^{TA = −255C}
5
4
T_A = 255C
3
2
1
0
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
V_DD − Supply Voltage − V
Figure 3.
V_CC
vs
V_O(H) (I_O(H) = -1mA
7
6
T_A = −255C
5
4
T_A = 855C
T_A = 255C
3
2
1
0
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
V_DD − Supply Voltage − V
Figure 4.
5