BQ24745_14 Datasheet, PDF (7/39 Pages) Texas Instruments – SMBus-Controlled Multi-Chemistry Battery

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bq24745
SLUS761D – DECEMBER 2007 – REVISED OCTOBER 2011
ELECTRICAL CHARACTERISTICS (continued)
7 V ≤ V_DCIN ≤ 24 V, 0°C < T_J < 125°C, typical values are at T_A = 25°C, with respect to AGND (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
ADAPTER CURRENT SENSE AMPLIFIER
V_{CSSP/N_OP}
V_VICM
I_VICM
A_VICM
Input common-mode range
VICM output-voltage range
VICM output current
Current-sense amplifier voltage gain
Adapter-current sense accuracy
I_{VICM_LIM}
Output-current limit
C_{VICM_MAX}
Maximum output load capacitance
ACIN COMPARATOR INPUT UNDERVOLTAGE)
Voltage on CSSP/CSSN
A_VICM = V_VICM/ V_{IREG_DPM}
V_{IREG_DPM} = V(CSSP–CSSN) ≥ 40 mV
V_{IREG_DPM} = V(CSSP–CSSN) = 20 mV
V_{IREG_DPM} = V(CSSP–CSSN) = 5 mV
V_{IREG_DPM} = V(CSSP–CSSN) = 1.5 mV
V_VICM = 0 V
For stability with 0-mA to 1-mA load
0
0
0
–2%
–3%
–25%
–33%
1
24
2.25
1
20
2%
3%
25%
33%
100
V_{DCIN_VFB_OP}
Differential voltage from DCIN to VFB
V_{ACIN_CHG}
ACIN rising threshold
Min. voltage to enable charging, V_ACIN rising
V_{ACIN_CHG_HYS}
ACIN falling hysteresis
ACIN rising deglitch⁽¹⁾
V_ACIN falling
V_ACIN rising
ACIN falling deglitch
V_ACIN falling
V_{ACIN_BIAS}
Adapter present rising threshold
Min voltage to enable all bias, V_ACIN rising
V_{ACIN_BIAS_HYS}
Adapter present falling hysteresis
ACIN rising deglitch ⁽¹⁾
V_ACIN falling
V_ACIN rising
ACIN falling deglitch
V_ACIN falling
DCIN / VFB COMPARATOR (REVERSE DISCHARGING PROTECTION)
–20
2.376
50
0.56
24
2.4
2.424
40
100
150
1
0.62
0.68
20
200
1
V_{DCIN-VFB_FALL}
V_{DCIN-VFB__HYS}
DCIN to VFB falling threshold
DCIN to VFB hysteresis
DCIN to VFB rising deglitch
DCIN to VFB falling deglitch
VFB OVERVOLTAGE COMPARATOR
V_DCIN – V_VFB to turn off ACFET
V_DCIN – V_VFB > V_{DCIN-VFB_RISE}
V_DCIN – V_VFB < V_{DCIN-VFB_FALL}
140
185
240
50
1
3.3
V_{OV_RISE}
Overvoltage rising threshold
As percentage of V_{VFB_REG}
104
V_{OV_FALL}
Overvoltage falling threshold
As percentage of V_{VFB_REG}
102
VFB SHORT (UNDERVOLTAGE and TRICKLE CHARGE) COMPARATOR
V_{VFB_SHORT_RISE} VFB short rising threshold
V_{VFB_SHORT_HYS} VFB short falling hysteresis
VFB short rising deglitch
V_VFB > V_{VFB_SHORT} + V_{VFB_SHORT_HYS}
Detection delay
2.6
2.7
2.9
215
1.5
I_{TRKL_REG_ACC}
VFB short falling deglitch
Trickle-charge current-regulation accuracy in
BATSHORT
V_VFB < V_{VFB_SHORT}
V_VFB < V_{VFB_SHORT}
3.3
60
200
300
I_{LOW_MAX_REG}
Maximum charge current regulation at low
voltage (<4 V)
V_{VFB_SHORT} < V_VFB < 4
3
CHARGE OVERCURRENT COMPARATOR
V_OC
Charge overcurrent falling threshold
As percentage of I_{REG_CHG}
Minimum current limit (CSOP–CSON)
145%
50
Internal filter pole frequency
160
INPUT UNDERVOLTAGE LOCK-OUT COMPARATOR (UVLO)
UVLO
AC undervoltage rising threshold
Measure on DCIN pin
3.5
4
4.5
V_{UVLO_HYS}
AC undervoltage hysteresis, falling
260
INPUT CURRENT COMPARATOR
V_{ICCOMP_OFFSET} Input current-comparator offset voltage
-6.8
0.12
6.8
UNIT
V
V
mA
V/V
mA
pF
V
V
mV
μs
μs
V
mV
μs
mV
mV
ms
μs
%
V
mV
μs
μs
mA
A
mV
kHz
V
mV
mV
(1) Verified by design.
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