Datasheet

bq24707
bq24707A
SLUSA78B –JULY 2010– REVISED MARCH 2011 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
4.5 V ≤ V
(VCC)
≤ 24 V, 0°C ≤ T
J
≤ 125°C, typical values are at T
A
= 25°C, with respect to GND (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
CHARGE UNDER-CURRENT COMPARATOR (CHG_UCP)
V
UCP_FALL
Charge under current falling threshold V
SRP
falling towards V
SRN
1 5 9 mV
LIGHT LOAD COMPARATOR (LIGHT_LOAD)
V
LL_FALL
Light load falling threshold Measure voltage drop across current sensing resistor 1.25 mV
V
LL_RISE_HYST
Light load rising hysteresis Measure voltage drop across current sensing resistor 1.25 mV
BATTERY LOWV COMPARATOR (BAT_LOWV)
V
BATLV_FALL
Battery LOWV falling threshold V
SRN
falling 2.4 2.5 2.6 V
V
BATLV_RHYST
Battery LOWV rising hysteresis V
SRN
rising 200 mV
I
BATLV
Battery LOWV charge current limit 10mΩ current sensing resistor 0.5 A
THERMAL SHUTDOWN COMPARATOR (TSHUT)
T
SHUT
Thermal shutdown rising temperature Temperature rising 155 °C
T
SHUT_HYS
Thermal shutdown hysteresis, falling Temperature falling 20 °C
ILIM COMPARATOR
V
ILIM_FALL
ILIM as CE falling threshold V
ILIM
falling 60 75 90 mV
V
ILIM_RISE
ILIM as CE rising threshold V
ILIM
rising 90 105 120 mV
LOGIC INPUT (SDA, SCL)
V
IN_ LO
Input low threshold 0.8 V
V
IN_ HI
Input high threshold 2.1 V
I
IN_ LEAK
Input bias current V = 7 V –1 1 μA
LOGIC OUTPUT OPEN DRAIN (ACOK, SDA, IFAULT, CMPOUT)
V
OUT_ LO
Output saturation voltage 5 mA drain current 500 mV
I
OUT_ LEAK
Leakage current V = 7 V –1 1 μA
ANALOG INPUT (ACDET, ILIM)
I
IN_ LEAK
Input bias current V = 7 V –1 1 μA
ANALOG INPUT (CMPIN has 50kΩ series resistor and 2000kΩ pull down resistor)
I
IN_LEAK
Input bias current V = 7 V 1 3.5 7 μA
PWM OSCILLATOR
F
SW
PWM switching frequency ChargeOption() bit [9] = 0 (default) 600 750 900 kHz
F
SW+
PWM increase frequency ChargeOption() bit [10:9] = 11 665 885 1100 kHz
F
SW–
PWM decrease frequency ChargeOption() bit [10:9] = 01 465 615 765 kHz
PWM HIGH SIDE DRIVER (HIDRV)
R
DS_HI_ON
High side driver (HSD) turn-on resistance V
BTST
– V
PH
= 5.5 V, I = 10mA 12 20 Ω
R
DS_HI_OFF
High side driver turn-off resistance V
BTST
– V
PH
= 5.5 V, I = 10mA 0.65 1.3 Ω
V
BTST_REFRESH
Bootstrap refresh comparator threshold voltage V
BTST
– V
PH
when low side refresh pulse is requested 3.85 4.3 4.7 V
PWM LOW SIDE DRIVER (LODRV)
R
DS_LO_ON
Low side driver (LSD) turn-on resistance V
REGN
= 6 V, I = 10 mA 15 25 Ω
R
DS_LO_OFF
Low side driver turn-off resistance V
REGN
= 6 V, I = 10 mA 0.9 1.4 Ω
PWM DRIVER TIMING
t
LOW_HIGH
Driver dead time from low side to high side 20 ns
t
HIGH_LOW
Driver dead time from high side to low side 20 ns
INTERNAL SOFT START
I
STEP
Soft start step size In CCM mode, 10mΩ current sense resistor 64 mA
t
STEP
Soft start step time In CCM mode, 10mΩ current sense resistor 240 μs
INDEPENDENT COMPARATOR
(2)
V
IC_REF1
Comparator reference ChargeOption() bit [4] = 0, rising edge (default) 0.585 0.6 0.615 V
V
IC_REF2
Comparator reference ChargeOption() bit [4] = 1, rising edge 2.375 2.4 2.425 V
R
S
Series resistor 50 kΩ
R
DOWN
Pull down resistor 2000 kΩ
(2) User can adjust threshold via SMBus ChargeOption() REG0x12.
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