BQ24740_07 Datasheet, PDF (9/32 Pages) Texas Instruments – Host-controlled Multi-chemistry Battery Charger with Low Input Power Detect

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bq24740
SLUS736 – DECEMBER 2006
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
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
V_UVLO
AC Under-voltage rising threshold
V_{UVLO_HYS}
AC Under-voltage hysteresis, falling
BAT OVER-VOLTAGE COMPARATOR
Measure on PVCC
3.5
4
260
4.5 V
mV
V_{OV_RISE}
Over-voltage rising threshold ⁽²⁾
V_{OV_FALL}
Over-voltage falling threshold ⁽²⁾
CHARGE OVER-CURRENT COMPARATOR
As percentage of V_{BAT_REG}
104
%
102
V_OC
Charge over-current falling threshold
As percentage of I_{REG_CHG}
Minimum Current Limit (SRP-SRN)
145
%
50
mV
INPUT CURRENT LOW-POWER MODE COMPARATOR
V_{ACLP_HYS}
AC low power hysteresis
V_{ACLP_OFFSET} AC low power rising threshold
THERMAL SHUTDOWN COMPARATOR
2.8
mV
1
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}
V_{BTST_REFRESH}
High side driver turn-on resistance
High side driver turn-off resistance
Bootstrap refresh comparator threshold
voltage
V_BTST– V_PH = 5.5 V, tested at 100 mA
V_BTST– V_PH = 5.5 V, tested at 100 mA
V_BTST– V_PH when low side refresh
pulse is requested
3
6
Ω
0.7 1.4
4
V
PWM LOW SIDE DRIVER (LODRV)
R_{DS_LO_ON}
Low side driver turn-on resistance
R_{DS_LO_OFF}
Low side driver turn-off resistance
PWM DRIVERS TIMING
REGN = 6 V, tested at 100 mA
REGN = 6 V, tested at 100 mA
3
6
Ω
0.6 1.2
Driver Dead Time — Dead time when
switching between LODRV and HIDRV.
No load at LODRV and HIDRV
30
ns
PWM OSCILLATOR
F_SW
V_{RAMP_HEIGHT}
PWM switching frequency
PWM ramp height
As percentage of PVCC
240
360 kHz
6.6
%PVCC
(2) Verified by design.
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