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