BQ24740_14 Datasheet, PDF (9/33 Pages) Texas Instruments – Host-Controlled Multi-Chemistry Battery Charger

bq24740
www.ti.com............................................................................................................................................... SLUS736C – DECEMBER 2006 – 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
AC CURRENT DETECT COMPARATOR (INPUT UNDERCURRENT)
V_ACIDET
Adapter current detect rising threshold
V_{ACIDET_HYS}
Adapter current detect hysteresis
PVCC / BAT COMPARATOR
V_ACI = I_AC × R_AC × 20, falling edge
Rising edge
200 250 300 mV
50
mV
V_{PVCC-BAT_FALL} PVCC to BAT falling threshold
V_PVCC – V_BAT to disable charger
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
7
9
11 ms
10
µs
UVLO
AC Undervoltage rising threshold
Measure on PVCC
3.5
4 4.5 V
UVLO_HYS
AC Undervoltage hysteresis, falling
260
mV
BAT OVERVOLTAGE COMPARATOR
V_{OV_RISE}
V_{OV_FALL}
Overvoltage rising threshold ⁽²⁾
Overvoltage falling threshold ⁽²⁾
CHARGE OVERCURRENT COMPARATOR
As percentage of V_{BAT_REG}
104%
102%
V_OC
Charge overcurrent 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(on)_HI}
R_{DS(off)_HI}
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(on)_HI}
Low side driver turn-on resistance
R_{DS(off)_LO}
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) Specified by design.
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