BQ24765 Datasheet, PDF (8/36 Pages) Texas Instruments – SMBus-Controlled Multi-Chemistry Battery Charger With Integrated Power MOSFETs

bq24765
SLUS999 – NOVEMBER 2009
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ELECTRICAL CHARACTERISTICS (continued)
7.0 V ≤ V(DCINA) ≤ 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
DCIN INPUT UNDERVOLTAGE LOCK-OUT COMPARATOR (UVLO)
V_{DCIN_UVLO}
DCINA undervoltage rising
threshold
Measure on DCINA pin
3.5
4
4.5
V
V_{DCIN_UVLO_HYS}
DCINA undervoltage hysteresis,
falling
260
mV
INPUT CURRENT COMPARATOR
V_{ICCOMP_OFFSET}
AC low power mode comparator
offset voltage
On ICREF
–8
8
mV
THERMAL SHUTDOWN COMPARATOR
T_SHUT
T_{SHUT_HYS}
Thermal shutdown threshold with
rising temperature
Thermal shutdown hysteresis,
falling
Temperature rising
Temperature falling
155
°C
20
PWM HIGH SIDE POWER MOSFET
R_{DSON_HI}
High side power MOSFET drain to
source on resistance
V_BOOT – V_PHASE = 5.5 V, Drain current = 4 A, T_J =
25°C
V_BOOT – V_PHASE = 5.5 V, Drain current = 4 A, T_J = 0
to 125°C
27
32
mΩ
27
46
V_{BOOT_REFRESH}
Bootstrap refresh comparator
threshold voltage
V_BOOT – V_PHASE when low side refresh pulse is
requested
4
V
I_{BOOT_LEAK}
BOOT leakage current
PWM LOW SIDE POWER MOSFET
High Side is on; Charge enabled
200
μA
R_{DS_LO_ON}
Low side power MOSFET drain to
source on resistance
PWM DRIVERS TIMING
V_VDDP = 6 V, Drain Current = 4A, T_J = 25°C
V_VDDP = 6 V, Drain Current = 4A, T_J = 0 to 125°C
38
45
mΩ
38
66
Minimum driver dead time
Dead time when switching between High-Side
MOSFET and Low-Side MOSFET. Adaptive
protective dead-time could be more.
25
ns
PWM OSCILLATOR
F_SW
PWM switching frequency
V_{RAMP_OFFSET}
PWM ramp offset
V_{RAMP_HEIGHT}
PWM ramp height
QUIESCENT CURRENT
As percentage of DCINA
540
700
200
6.67
840
kHz
mV
%DCINA
I_{OFF_STATE}
Total off-state battery current from
CSOP, CSON, VFB, DCINA,
DCINP, BOOT, PHASE, etc.,
Adapter removed
V_VFB = 16.8 V, V_ACIN < 0.6 V,
V_DCINA > 5 V, ≤ T_J = 0°C to 85°C
7
10
μA
I_{BAT_ON}
I_{BAT_LOAD_CD}
Battery on-state quiescent current
Internal battery load current,during
charge disabled, adapter
connected
V_VFB = 16.8 V, 0.6V < V_ACIN < 2.4 V,
V_DCINA > 5 V
Charge is disabled: V_VFB = 16.8 V,
V_ACIN > 2.4 V, V_DCINA > 5 V
1
mA
0.5
1
mA
I_{BAT_LOAD_CE}
Internal battery load current during
charge enabled, charging. CSOP,
CSON, VFB, BOOT, PHASE
CE = high, V_VFB = 16.8 V,
V_ACIN > 2.4 V, V_DCINA > 5 V
6
10
12
mA
I_AC
Adapter quiescent current, charge
disabled
CE = low, V_DCINA = 20 V
0.5
1
mA
I_{AC_SWITCH}
Adapter switching quiescent
current
Charge enabled, V_DCINA = 20 V, converter switching
25
mA
INTERNAL SOFT START (8 Steps to Regulation Current ICHG)
Soft start steps
8
step
Soft start step time
1.6
ms
CHARGER SECTION POWER-UP SEQUENCING
Charge-Enable Delay after
Power-up
Delay from when adapter is detected and CE is high
to when the charger is allowed to turn on
2
ms
8
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