BQ294502 Datasheet, PDF (5/18 Pages) Texas Instruments – Overvoltage Protection for 2-Series and 3-Series Cell Li-Ion Batteries

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bq294502, bq294504, bq294512, bq294515
bq294522, bq294524, bq294532, bq294562
bq294572, bq294582, bq294592
SLUSAJ3C – SEPTEMBER 2011 – REVISED MAY 2012
DC CHARACTERISTICS
Typical values stated where T_A = 25°C and VDD = 10.8 V, MIN/MAX values stated where T_A = –40°C to 110°C and V_DD =
3 V to 15 V (unless otherwise noted).
Symbol
Parameter
Condition
Min
Typ
Max Unit
Voltage Protection Threshold VCx
1.0
bq294502, fixed delay 4 s
4.35
V
1.1
bq294504, fixed delay 6.5 s
4.35
V
1.2
bq294512, fixed delay 4 s
4.40
V
1.3
bq294515, fixed delay 4 s
4.425
V
1.4
bq294522, fixed delay 4 s
1.5
V_(PROTECT) –
bq294524, fixed delay 6.5 s
1.6
V_OV
Overvoltage
Detection
bq294532, fixed delay 4 s
1.7
bq294562, fixed delay 4 s
4.45
V
4.45
V
4.50
V
4.25
V
1.8
bq294572, fixed delay 4 s
4.00
V
1.9
bq294582, fixed delay 4 s
4.225
V
1.10
bq294584, fixed delay 6.5 s⁽¹⁾
4.225
V
1.11
bq294592, fixed delay 4 s
4.30
V
1.12
V_HYS
Overvoltage
Detection
Hysteresis
250
300
400
mV
1.13
V_OA
OV Detection
Accuracy
T_A = 25°C
–10
10
mV
1.14
V_{OA –DRIFT}
OV Detection
Accuracy due to
Temperature
Supply and Leakage Current
T_A = -40°C
T_A = 0°C
T_A = 60°C
T_A = 110°C
-40
44
mV
-20
20
mV
-24
24
mV
-54
54
mV
(V3–V2) = (V2–V1) = (V1–VSS) = 4.0 V (See
Figure 11 for reference)
1.15
I_CC
Supply Current
(V3–V2) = (V2–V1) = (V1–VSS) = 2.8 V with T_A =
–40°C to 60°C
1
2
µA
1.25
1.16
I_IN
Input Current at
Vx Pins
Measured at V3, V2, and V1 = 4.0 V
(V2–V1) = (V1–VSS) = 4.0 V
T_A = 0°C to 60°C (See Figure 11 for reference.)
–0.1
Output Drive OUT
0.1
µA
1.17
(V3–V2) or (V2–V1) or (V1–VSS) > V_OV
V_DD = 7.2 V, I_OH = 100 µA, T_A = –40°C to 110°C
6
V
Two of the three cells are short circuit and only one
1.18
V_OUT
Output Drive
Voltage
cell is powered
(V3–V2) or (V2–V1) or (V1–VSS) > V_OV
V_DD = Vx (Cell voltage), I_OH = 100 µA, T_A = –40°C to
VDD –
0.2
V
110°C
1.19
1.20
I_OUT(Short)
OUT Short
Circuit Current
(V3–V2), (V2–V1), and (V1–VSS) < V_OV, I_OL = 100
µA, T_A = 25°C
T_A = –40°C to 110°C
OUT = 0 V (V3–V2) or (V2–V1) or (V1–VSS) > V_OV
250
400
mV
4.5
mA
1.21
t_R
Output Rise
Time
CL = 1 nF, V_OH(OUT) = 0 V to 5 V ⁽²⁾
5
µs
1.22
Z_O
Output
Impedance
2
5
kΩ
Fixed Delay Timer
1.23
t_DELAY
Fault Detection ^{Fixed Delay, bq2945x2}
Delay Time
Fixed Delay, bq2945x4
3.2
4
4.8
s
5.2
6.5
7.8
(1) Product Preview only
(2) Specified by design. Not 100% tested in production.
Copyright © 2011–2012, Texas Instruments Incorporated
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