BQ24705 Datasheet, PDF (7/30 Pages) Texas Instruments – Host-Controlled Multi-Chemistry Battery Charger With Low Input Power Detect

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bq24705
SLUS779 – DECEMBER 2007
ELECTRICAL CHARACTERISTICS (continued)
7.0 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
ACDET COMPARATOR
V_{PVCC-BAT_OP}
V_{ACDET_CHG}
Differential Voltage from PVCC to BAT
ACDET adapter-detect rising threshold
V_{ACDET_CHG_HYS} ACDET falling hysteresis
ACDET rising deglitch⁽¹⁾
Charge Enable after ACDET rising
Min voltage to enable charging,
V_ACDET rising
V_ACDET falling
V_ACDET rising
–20
24 V
2.376 2.40 2.424 V
40
mV
6.4
8 9.6 ms
518 700 908 ms
V_{ACDET_BIAS}
ACDET falling deglitch
ACDET enable-bias rising threshold
V_ACDET falling
Min voltage to enable all bias, V_ACDET
rising
10
µs
0.56 0.62 0.68 V
V_{ACDET_BIAS_HYS} Adapter present falling hysteresis
ACDET rising deglitch ⁽¹⁾
V_ACDET falling
V_ACDET rising
ACDET falling deglitch
V_ACDET falling
OPEN-DRAIN LOGIC OUTPUT PIN CHARACTERISTICS (ACGOOD)
20
mV
10
µs
10
V_{OUT_LO}
Output low saturation voltage
Delay, ACGOOD falling
Sink Current = 4 mA
0.5 V
6.4
8 9.6 ms
Delay, ACGOOD rising
10
µs
INPUT OVERVOLTAGE COMPARATOR (ACOV)
V_ACOV
AC Overvoltage rising threshold on
ACDET
(See ACDET in Terminal Functions)
3.007 3.1 3.193 V
V_{ACOV_HYS}
AC Overvoltage rising deglitch
AC Overvoltage falling deglitch
1.3
ms
1.3
AC CURRENT DETECT COMPARATOR (INPUT UNDER_CURRENT)
V_ACIDET
Adapter current detect rising threshold
V_ACI = I_AC × R_AC × 20, falling edge
V_{ACIDET_HYS}
Adapter current detect hysteresis
Rising edge
PVCC / BAT COMPARATOR (REVERSE DISCHARGING PROTECTION)
200 250 300 mV
50
mV
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)
140 185 240 mV
50
mV
10
µs
6
UVLO
AC Undervoltage rising threshold
Measure on PVCC
3.5
4 4.5 V
V_{UVLO_HYS}
AC Undervoltage hysteresis, falling
BAT OVERVOLTAGE COMPARATOR
V_{OV_RISE}
V_{OV_FALL}
Overvoltage rising threshold ⁽¹⁾
Overvoltage falling threshold ⁽¹⁾
CHARGE OVERCURRENT COMPARATOR
As percentage of V_{BAT_REG}
260
mV
104%
102%
V_OC
Charge overcurrent falling threshold
As percentage of I_{REG_CHG}
Minimum Current Limit (SRP-SRN)
145%
50
mV
THERMAL SHUTDOWN COMPARATOR
T_SHUT
Thermal shutdown rising temperature
T_{SHUT_HYS}
Thermal shutdown hysteresis, falling
PWM HIGH SIDE DRIVER (HIDRV)
Temperature Increasing
155
°C
20
R_{DS_HI_ON}
R_{DS_HI_OFF}
High side driver turn-on resistance
High side driver turn-off resistance
V_BTST – V_PH = 5.5 V, tested at 100 mA
V_BTST – V_PH = 5.5 V, tested at 100 mA
3
6
Ω
0.7 1.4
(1) Specified by design.
Copyright © 2007, Texas Instruments Incorporated
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