BQ24747 Datasheet, PDF (7/36 Pages) Texas Instruments – SMBus-Controlled Level 2 Multi-Chemistry Battery Charger With Input Current Detect Comparator and Charge Enable Pin

bq24747
www.ti.com ............................................................................................................................................................................................. SLUS988 – OCTOBER 2009
ELECTRICAL CHARACTERISTICS (continued)
7.0 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 UNIT
ADAPTER CURRENT SENSE AMPLIFIER
V_{CSSP/N_OP}
V_VICM
A_VICM
Input common mode range
VICM output voltage range
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
–2%
–3%
–25%
–33%
1
24
V
2.25
V
20
V/V
2%
3%
25%
33%
mA
100 pF
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
V
2.40
2.424
V
40
mV
100
150 μs
1
μs
0.62
0.68
V
20
mV
200
μs
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 mV
50
mV
1
ms
3.3
μs
V_{OV_RISE}
Over-voltage rising threshold
As percentage of V_{VFB_REG}
V_{OV_FALL}
Over-voltage falling threshold
As percentage of V_{VFB_REG}
VFB SHORT (UNDERVOLTAGE and TRICKLE CHARGE) COMPARATOR
104
%
102
V_{VFB_SHORT_RISE} VFB short rising threshold
V_{VFB_SHORT_HYS} VFB short rising hysteresis
VFB short rising deglitch
V_VFB > V_{VFB_SHORT}+V_{VFB_SHORT_HYS} Detection
delay
2.4
2.7
215
1.5
2.9
V
mV
μs
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
μs
60
220
300 _mA
I_{LOW_MAX_REG}
Maximum Charge current regulation at Low
Voltage (<4V)
V_{VFB_SHORT} < V_VFB < 4
3
A
CHARGE OVERCURRENT COMPARATOR
V_OC
Charge overcurrent falling threshold
As percentage of I_{REG_CHG}
Minimum Current Limit (CSOP–CSON)
145%
50
mV
Internal Filter Pole Frequency
160
kHz
INPUT UNDERVOLTAGE LOCK-OUT COMPARATOR (UVLO)
UVLO
AC undervoltage rising threshold
Measure on DCIN pin
3.5
4
4.5
V
V_{UVLO_HYS}
AC undervoltage hysteresis, falling
INPUT CURRENT COMPARATOR
260
mV
V_{ICCOMP_OFFSET} Input current comparator offset voltage
-6.8
0.12
6.8 mV
(1) Verified by design.
Copyright © 2009, Texas Instruments Incorporated
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