BQ24751B Datasheet, PDF (7/38 Pages) Texas Instruments – Host-Controlled Multi-Chemistry Battery Charger with Low Iq and System Power Selector

Not Recommended For New Designs
bq24751B
www.ti.com .......................................................................................................................................................... SLUS835A – JULY 2008 – REVISED MARCH 2009
ELECTRICAL CHARACTERISTICS (continued)
7 V ≤ V_PVCC ≤ 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
REGN REGULATOR
V_{REGN_REG}
REGN regulator voltage
I_{REGN_LIM}
REGN current limit
ADAPTER CURRENT SENSE AMPLIFIER
V_ACDET > 0.6 V, 0-75 mA, PVCC > 10 V
V_REGN = 0 V, V_ACDET > 0.6 V
5.6 5.9
6.2
V
90
135
mA
V_{ACP/N_OP}
V_IADAPT
I_IADAPT
A_IADAPT
Input common mode range
IADAPT output voltage range
IADAPT output current
Current sense amplifier voltage gain
Adapter current sense accuracy
I_{IADAPT_LIM}
Output current limit
C_{IADAPT_MAX}
Maximum output load capacitance
ACDET COMPARATOR
Voltage on ACP/ACN
A_IADAPT = V_IADAPT / V_{IREG_DPM}
V_{IREG_DPM} = 40–100 mV
V_{IREG_DPM} = 20 mV
V_{IREG_DPM} = 5 mV
V_{IREG_DPM} = 1.5 mV
V_IADAPT = 0 V
For stability with 0 mA to 1 mA load
0
24
V
0
2
0
1
mA
20
V/V
–2%
2%
–3%
3%
–25%
25%
–33%
33%
1
mA
100
pF
V_{ACDET_CHG}
ACDET adapter-detect rising threshold Min voltage to enable charging, V_ACDET rising
V_{ACDET_CHG_HYS}
ACDET falling hysteresis
V_ACDET falling
ACDET rising deglitch
V_ACDET rising
ACDET falling deglitch
V_ACDET falling
V_{ACDET_BIAS}
ACDET enable-bias rising threshold
Min voltage to enable all bias, V_ACDET rising
V_{ACDET_BIAS_HYS}
Adapter present falling hysteresis
V_ACDET falling
ACDET rising deglitch
V_ACDET rising
ACDET falling deglitch
V_ACDET falling
PVCC / BAT COMPARATOR (REVERSE DISCHARGING PROTECTION)
2.376 2.40 2.424
V
40
mV
518 700
908
ms
7
9
11
ms
0.56 0.62 0.68
V
20
mV
10
µs
10
µs
V_{PVCC-BAT_OP}
Differential Voltage from PVCC to BAT
V_{PVCC-BAT_FALL}
PVCC to BAT falling threshold
V_PVCC – V_BAT to turn off ACFET
V_{PVCC-BAT__HYS}
PVCC to BAT hysteresis
PVCC to BAT Rising Deglitch
V_PVCC – V_BAT > V_{PVCC-BAT_RISE}
PVCC to BAT Falling Deglitch
V_PVCC – V_BAT < V_{PVCC-BAT_FALL}
INPUT UNDERVOLTAGE LOCK-OUT COMPARATOR (UVLO)
–20
24
V
140 185
240
mV
50
mV
7
9
11
ms
6
µs
UVLO
AC Undervoltage rising threshold
Measured on PVCC
3.5
4
4.5
V
UVLO_(HYS)
AC Undervoltage hysteresis, falling
AC LOWVOLTAGE COMPARATOR (ACLOWV)
260
mV
V_ACLOWV
AC lowvoltage rising threshold
AC lowvoltage falling threshold
Measure on ACP pin
3.6
V
3
ACN / BAT COMPARATOR
V_{ACN-BAT_FALL}
V_{ACN-BAT_HYS}
ACN to BAT falling threshold
ACN to BAT hysteresis
ACN to BAT rising deglitch
ACN to BAT falling deglitch
BAT OVERVOLTAGE COMPARATOR
V_ACN – V_BAT to turn on BATDRV
V_ACN – V_BAT > V_{ACN-BAT_RISE}
V_ACN – V_BAT < V_{ACN-BAT_FALL}
175 285
340
mV
50
mV
20
µs
6
µs
V_{OV_RISE}
V_{OV_FALL}
Overvoltage rising threshold
Overvoltage falling threshold
As percentage of V_{BAT_REG}
As percentage of V_{BAT_REG}
104%
102%
Copyright © 2008–2009, Texas Instruments Incorporated
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