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ELECTRICAL CHARACTERISTICS (Continued)
(3)
I
BAT
+
SRSET
R
SENSE
1
A
V
measured gain, A
V
.
Dc +
SRSET
A
V
, Total accuracy in % +
(
Dm * Dc
)
Dc
100,I
(SRP)
* I
(SRN)
+ 0
bq24702
bq24703
SLUS553E – MAY 2003 – REVISED OCTOBER 2007
– 40 ° C ≤ T
J
≤ 125 ° C, 7 V
DC
≤ V
CC
≤ 28 V
DC
, all voltages relative to V
SS
(unless otherwise specified)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
BATTERY CURRENT-SENSE AMPLIFIER
g
m
Transconductance gain 75 120 175 mA/V
CMRR Common-mode rejection ratio See
(1)
90 dB
Common-mode input (SRP, SRN) voltage
V
ICR
VCC = SRN, SRP + 2 V 5 30 V
range
I
(SINK)
Sink current (COMP) COMP = 1 V, (SRP – SRN) = 10 mV 0.5 1.5 2.5 mA
V
(SRP)
= 16 V, (SRP – SRN) = 100 mV,
Input bias current (SRP)
(2)
70 85 110
SRSET = 2.5 V, VCC = 28
I
IB
μ A
(SRP - SRN) = 100 mV, SRSET= 2.5 V,
Input bias current accuracy (I
SRP
– I
SRN
) – 3 0 3
VCC = 28 V, 0 ≤ T
J
≤ 125 ° C
V
(SET)
Battery current programming voltage (SRSET) 0 2.5 V
0.65 V ≤ SRSET ≤ 2.5 V,
A
V
Battery current set gain 24 25 26 V/V
8 V ≤ SRN ≤ 16 V
(3)
SRSET = 1.25 V, T
J
= 25 ° C
(4)
– 5% 5%
Total battery current-sense mid-scale accuracy
SRSET = 1.25 V
(4)
– 6% 6%
SRSET = 2.5 V, T
J
= 25 ° C
(4)
– 3% 3%
Total battery current-sense full-scale accuracy
SRSET = 2.5 V
(4)
– 4% 4%
(1) Specified by design. Not production tested.
(2) I
(SRP)
= I
(SRN)
= (V
(SRSET)
/ 50 k Ω ) + ((V
(SRP)
- V
(SRN)
/ 3 k Ω )
example: If (V
(SRSET)
= 2.5 V) , (V
(SRP)
- V
(SRN)
= 100 mV) Then I
(SRP)
= I
(SRN)
= 83 A
(4) Total battery-current set is based on the measured value of (SRP – SRN) = Δ m, and the calculated value of (SRP – SRN) = Δ C, using the
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