BQ24747 Datasheet, PDF (8/36 Pages) Texas Instruments – SMBus-Controlled Level 2 Multi-Chemistry Battery Charger With Input Current Detect Comparator and Charge Enable Pin

bq24747
SLUS988 – OCTOBER 2009 ............................................................................................................................................................................................. www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
7.0 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
VLOWV_VFB comparator
4
V
Reset time CE after falling-edge on-shot
2
ms
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) turn-on resistance
V_BOOT – V_PHASE = 5.5 V
R_{DS_HI_OFF}
High side driver turn-off 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) turn-on resistance
R_{DS_LO_OFF}
Low side driver turn-off 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
LOGIC INPUT PIN CHARACTERISTICS (CE)⁽²⁾ Pull-up CE with ≥2.2 kΩ resistor or directly to VREF.
100
ns
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
Sink Current = 5 mA
0.5
V
(2) Pull up CE with ≥ 2 kΩ resistor, or connect directly to VREF.
8
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