Datasheet

bq24765
SLUS999 –NOVEMBER 2009 www.ti.com
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 Measure on DCINA pin 3.5 4 4.5
V
threshold
V
DCIN_UVLO_HYS
DCINA undervoltage hysteresis, 260
mV
falling
INPUT CURRENT COMPARATOR
AC low power mode comparator On ICREF
V
ICCOMP_OFFSET
–8 8 mV
offset voltage
THERMAL SHUTDOWN COMPARATOR
Thermal shutdown threshold with
T
SHUT
Temperature rising 155
rising temperature
°C
T
SHUT_HYS
Thermal shutdown hysteresis, Temperature falling 20
falling
PWM HIGH SIDE POWER MOSFET
V
BOOT
– V
PHASE
= 5.5 V, Drain current = 4 A, T
J
=
27 32
25°C
High side power MOSFET drain to
R
DSON_HI
mΩ
source on resistance
V
BOOT
– V
PHASE
= 5.5 V, Drain current = 4 A, T
J
= 0
27 46
to 125°C
Bootstrap refresh comparator V
BOOT
– V
PHASE
when low side refresh pulse is
V
BOOT_REFRESH
4 V
threshold voltage requested
I
BOOT_LEAK
BOOT leakage current High Side is on; Charge enabled 200 μA
PWM LOW SIDE POWER MOSFET
V
VDDP
= 6 V, Drain Current = 4A, T
J
= 25°C 38 45
Low side power MOSFET drain to
R
DS_LO_ON
mΩ
source on resistance
V
VDDP
= 6 V, Drain Current = 4A, T
J
= 0 to 125°C 38 66
PWM DRIVERS TIMING
Dead time when switching between High-Side
Minimum driver dead time MOSFET and Low-Side MOSFET. Adaptive 25 ns
protective dead-time could be more.
PWM OSCILLATOR
F
SW
PWM switching frequency 540 700 840 kHz
V
RAMP_OFFSET
PWM ramp offset 200 mV
V
RAMP_HEIGHT
PWM ramp height As percentage of DCINA 6.67 %DCINA
QUIESCENT CURRENT
Total off-state battery current from
CSOP, CSON, VFB, DCINA, V
VFB
= 16.8 V, V
ACIN
< 0.6 V,
I
OFF_STATE
7 10 μA
DCINP, BOOT, PHASE, etc., V
DCINA
> 5 V, ≤ T
J
= 0°C to 85°C
Adapter removed
V
VFB
= 16.8 V, 0.6V < V
ACIN
< 2.4 V,
I
BAT_ON
Battery on-state quiescent current 1 mA
V
DCINA
> 5 V
Internal battery load current,during Charge is disabled: V
VFB
= 16.8 V,
I
BAT_LOAD_CD
charge disabled, adapter V
ACIN
> 2.4 V, V
DCINA
> 5 V 0.5 1 mA
connected
Internal battery load current during
CE = high, V
VFB
= 16.8 V,
I
BAT_LOAD_CE
charge enabled, charging. CSOP, 6 10 12 mA
V
ACIN
> 2.4 V, V
DCINA
> 5 V
CSON, VFB, BOOT, PHASE
Adapter quiescent current, charge
I
AC
CE = low, V
DCINA
= 20 V 0.5 1 mA
disabled
Adapter switching quiescent Charge enabled, V
DCINA
= 20 V, converter switching
I
AC_SWITCH
25 mA
current
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 Delay from when adapter is detected and CE is high
2 ms
Power-up to when the charger is allowed to turn on
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