BQ24700 Datasheet, PDF (7/29 Pages) Texas Instruments – NOTEBOOK PC BATTERY CHARGE CONTROLLER AND SELECTOR WITH DPM

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bq24700, bq24701
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)
adapter current-sense amplifier
PARAMETER
TEST CONDITIONS
MIN TYP
MAX UNIT
gm
Transconductance gain
CMRR Common-mode rejection ratio
See Note 1
90 150
90
210 mA/V
dB
VICR
Common-mode input voltage range
(ACP)
7.0
VCC+0.2 V
ISINK
IIB
Sink current (COMP)
Input bias current (ACP, ACN)
COMP = 1 V, (ACP – ACN) = 10 mV
ACP = ACN = 20 V, SRSET = 0 V,
VCC = 20 V,
ACSET = 1.25 V
0.5 1.5
15
25
2.5 mA
35 µA
Input bias current accuracy ratio
(ACP, ACN)
ACP = ACN = 20 V, VCC = 20 V,
ACSET = 1.25 V
0.95 1.00
1.05
VSET
AC current programming voltage
(ACSET)
0
2.5 V
AV
AC current set gain
0.65 V ≤ ACSET ≤ 2.5 V, 12 V ≤ ACP ≤ 20 V,
–40°C ≤ TA ≤ 85°C, See Note 4
24.5 25.5
26.5 V/V
Total ac current-sense mid-scale
ACSET = 1.25 V, TA = 25°C, See Note 5
–5%
5%
accuracy
ACSET = 1.25 V, –40°C ≤ TA ≤ 85°C, See Note 5 –6%
6%
Total ac current-sense full-scale
accuracy
ACSET = 2.5 V, TA = 25°C, See Note 5
ACSET = 2.5 V, –40°C ≤ TA ≤ 85°C, See Note 5
–3.5%
–4%
3.5%
4%
battery voltage error amplifier
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
gm
Transconductance gain
CMRR Common-mode rejection ratio
See Note 1
75 135 195 mA/V
90
dB
VICR
VIT
BATSET common-mode input voltage range
Internal reference override input threshold voltage
ISINK Sink current COMP
COMP = 1 V,
(BATP – BATSET) = 10 mV,
BATSET = 1.25 V
1
2.5 V
0.20 0.25 0.30 V
0.5 1.5 2.5 mA
TA = 25°C
1.241 1.246 1.251
VFB
Error-amplifier precision reference voltage
0°C ≤ TA ≤ 70°C
1.239 1.246 1.252 V
–40°C ≤ TA ≤ 85°C
1.234 1.246 1.254
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
4.
Calculation
of
the
AC
current:
IAC
+
ACSET
RSENSE
1
AV
5. Total ac-current set accuracy is based on the measured value of (ACP–ACN) = ∆c, using the measured gain, AV.
Dc
+
ACSET
AV
,
Total accuracy in %
+
(Dm *
Dc
Dc)
100
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