BQ24700_14 Datasheet, PDF (6/32 Pages) Texas Instruments – NOTEBOOK PC BATTERY CHARGE CONTROLLER

bq24700, bq24701
ą
NOTEBOOK PC BATTERY CHARGE CONTROLLER
AND SELECTOR WITH DPM
SLUS452B – APRIL 2001 – REVISED NOVEMBER 2002
electrical characteristics (T_A = T_OPR, 7.0 Vdc V_CC 20.0 Vdc, all voltages relative to V_ss) (unless
otherwise specified) (continued)
battery current-sense amplifier
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
gm
Transconductance gain
CMRR Common-mode rejection ratio
See Note 1
90 150 210 mA/V
90
dB
VICR
Common-mode input (SRP) voltage
range
VCC = SRN + 2 V
5
18.2 V
ISINK
IIB
Sink current (COMP)
Input bias current (SRP)
Input bias current (SRN)
COMP = 1 V,
VSRP = 16 V,
VSRP = 16 V,
(SRP – SRN) = 10 mV
SRSET = 0 V, VCC = 20
SRSET = 0 V, VCC = 20
0.5 1.5 2.5 mA
6
10
µA
200 300
VSET
Battery current programming voltage
(SRSET)
0
2.5 V
AV
Battery current set gain
0.65 V ≤ SRSET ≤ 2.5 V, 8 V ≤ SRN ≤ 16 V,
–40°C ≤ TA ≤ 85°C, See Note 2
24
25
26 V/V
Total battery current-sense mid-scale
SRSET = 1.25 V, TA = 25°C, See Note 3
–5%
5%
accuracy
SRSET = 1.25 V, –40°C ≤ TA ≤ 85°C, See Note 3 –6%
6%
Total battery current-sense full-scale
SRSET = 2.5 V, TA = 25°C, See Note 3
–3%
3%
accuracy
SRSET = 2.5 V, –40°C ≤ TA ≤ 85°C, See Note 3 –4%
4%
NOTES: 1. Ensured by design. Not production tested.
2.
IBAT
+
SRSET
RSENSE
1
AV
3. 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, AV.
DC
+
SRSET
AV
,
Total accuracy in %
+
(Dm *
Dc
Dc)
100
6
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