SLUS553D − MAY 2003 − REVISED JULY 2005
6
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ELECTRICAL CHARACTERISTICS (CONTINUED)
(−40°C ≤ T
J
≤ 125°C, 7.0 V
DC
≤ VCC ≤ 28 V
DC
, all voltages relative to V
ss
) (unless otherwise specified)
Battery Current-Sense Amplifier
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
g
m
Transconductance gain 75 120 175 mA/V
CMRR Common-mode rejection ratio See Note 1 90 dB
V
ICR
Common-mode input (SRP, SRN)
voltage range
VCC = SRN, SRP + 2 V 5 30 V
I
(SINK)
Sink current (COMP) COMP = 1 V, (SRP − SRN) = 10 mV 0.5 1.5 2.5 mA
Input bias current (SRP), See Note 2
V
(SRP)
= 16 V,
(SRP − SRN) = 100 mV
SRSET = 2.5 V,
VCC = 28
70 85 110
I
IB
Input bias current accuracy
(I
SRP
−
I
SRN
)
(SRP − SRN) = 100 mV, SRSET= 2.5 V,
VCC = 28 V, 0 ≤ T
J
≤ 125°C
−3 0 3
µA
V
(SET)
Battery current programming voltage
(SRSET)
0 2.5 V
A
V
Battery current set gain
0.65 V ≤ SRSET ≤ 2.5 V, 8 V ≤ SRN ≤ 16 V,
See Note 3
24 25 26 V/V
Total battery current-sense mid-scale
SRSET = 1.25 V, T
J
= 25°C, See Note 4 −5% 5%
Total battery current-sense mid-scale
accuracy
SRSET = 1.25 V, See Note 4
−6% 6%
Total battery current-sense full-scale
SRSET = 2.5 V, T
J
= 25°C, See Note 4 −3% 3%
Total battery current-sense full-scale
accuracy
SRSET = 2.5 V, See Note 4 −4% 4%
NOTES: 1. Specified by design. Not production tested.
2I
(SRP)
= I
(SRN)
= (V
(SRSET)
/ 50 kΩ) + ((V
(SRP)
− V
(SRN)
/ 3 kΩ)
example: If (V
(SRSET)
= 2.5 V) , (V
(SRP)
− V
(SRN)
= 100 mV) Then I
(SRP)
= I
(SRN)
= 83 µA
3. I
BAT
+
SRSET
R
SENSE
1
A
V
4. Total battery-current set is based on the measured value of (SRP−SRN) = ∆m, and the calculated value of (SRP−SRN) = ∆C, using
the measured gain, A
V
. Dc +
SRSET
A
V
, Total accuracy in % +
(
Dm * Dc
)
Dc
100,I
(SRP)
* I
(SRN)
+ 0
