BQ24745_14 Datasheet, PDF (8/39 Pages) Texas Instruments – SMBus-Controlled Multi-Chemistry Battery

bq24745
SLUS761D – DECEMBER 2007 – REVISED OCTOBER 2011
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ELECTRICAL CHARACTERISTICS (continued)
7 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
THERMAL SHUTDOWN COMPARATOR
T_SHUT
Thermal shutdown rising temperature
T_{SHUT_HYS}
Thermal shutdown hysteresis, falling
PWM HIGH SIDE DRIVER (UGATE)
Temperature Increasing
155
°C
20
R_{DS_HI_ON}
High-side driver (HSD) turnon resistance
V_BOOT – V_PHASE = 5.5 V
R_{DS_HI_OFF}
High-side driver turnoff resistance
V_BOOT – V_PHASE = 5.5 V
V_{BOOT_REFRESH}
Bootstrap refresh comparator threshold
voltage
V_BOOT – V_PHASE when low-side refresh pulse
is requested
4
6
Ω
1
Ω
V
I_{BOOT_LEAK}
BOOT leakage current when charge enabled
PWM LOW SIDE DRIVER (LGATE)
High side is on; charge enabled
200 μA
R_{DS_LO_ON}
Low-side driver (LSD) turnon resistance
R_{DS_LO_OFF}
Low-side driver turnoff resistance
PWM DRIVERS TIMING
6
Ω
1
Ω
Driver dead time
Dead time when switching between LGATE
and UGATE , no load at LGATE and UGATE
30
ns
PWM OSCILLATOR
F_SW
PWM switching frequency
V_{RAMP_HEIGHT}
PWM ramp height
QUIESCENT CURRENT
As percentage of DCIN
240
6.67
360 kHz
%DCIN
I_{OFF_STATE}
I_{BAT_ON}
I_{BAT_LOAD_CD}
I_{BAT_LOAD_CE}
I_AC
I_{AC_SWITCH}
Total off-state battery current from CSOP,
CSON, VFB, DCIN, BOOT, PHASE, etc
Battery on-state quiescent current
Internal battery load current, charge disabled
Internal battery load current, charge enabled
Adapter quiescent current
Adapter switching quiescent current
V_VFB = 16.8 V, V_ACIN < 0.6 V,
V_DCIN > 5 V, 0°C ≤ T_J ≤ 85°C
V_VFB = 16.8 V, 0.6V < V_ACIN < 2.4 V,
V_DCIN > 5 V
Charge is disabled: V_VFB = 16.8 V,
V_ACIN > 2.4 V, V_DCIN > 5 V
Charge is enabled: V_VFB = 16.8 V,
V_ACIN > 2.4 V, V_DCIN > 5 V
Charge disabled, V_DCIN = 20 V
Charge enabled, V_DCIN = 20 V, converter
running
7
0.7
0.7
6
10
0.7
25
10 μA
1 mA
1 mA
12 mA
1 mA
mA
INTERNAL SOFT START (8 Steps to Regulation Current ICHG)
Soft-start steps
8
step
Soft-start step time
1.5
ms
CHARGER SECTION POWER-UP SEQUENCING
Charge-enable delay after power up
Delay from when adapter is detected to when
the charger is allowed to turn on
1.5
ms
CHARGE UNDERCURRENT COMPARATOR (CYCLE-BY-CYCLE SYNCHRONOUS TO NON-SYNCHRONOUS)
V_UCP
Cycle-by-cycle synchronous to
non-synchronous transition threshold
Cycle-by-cycle, (CSOP-CSON) voltage,
falling, LGATE turns off and latches off until
next cycle
5
10
15 mV
Blankout time after LGATE turns on
Blankout comparator after LGATE turns on
100
ns
LOGIC INPUT PIN CHARACTERISTICS (CE)⁽²⁾ Pull-up CE with ≥2.2 kΩ resistor or directly to VREF.
V_{IN_LO}
Input low-threshold voltage
V_{IN_HI}
Input high-threshold voltage
V_BIAS
Input bias current
V = 0 TO V_VDDP
OPEN-DRAIN LOGIC OUTPUT PIN CHARACTERISTICS (ACOK, ICOUT)
0.8
V
2.1
1 μA
V_{OUT_LO}
Output low saturation voltage
VDDSMB INPUT SUPPLY FOR SMBus
Sink current = 5 mA
0.5
V
V_{VDDSMB_RANGE}
V_{VDDSMB_UVLO_}
Threshold_Rising
V_{VDDSMB_UVLO_}
Hyst_Rising
VDDSMB input voltage range
VDDSMB undervoltage lockout threshold
voltage, rising
VDDSMB undervoltage lockout hysteresis
voltage, falling
V_VDDSMB rising
V_VDDSMB falling
2.7
5.5
V
2.4
2.5
2.6
V
100
150
200
V
(2) Pull up CE with ≥ 2-kΩ resistor, or connect directly to VREF.
8
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