Datasheet

bq24640
www.ti.com SLUSA44 –MARCH 2010
ELECTRICAL CHARACTERISTICS (continued)
5.0 V ≤ V(VCC) ≤28 V, 0°C < T < +125°C, typical values are at T
A
= 25°C, with respect to GND (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
CHARGE VOLTAGE REGULATION
V
FB
Feedback regulation voltage 2.1 V
T
J
= 0°C to 85°C –0.5% 0.5%
Charge voltage regulation accuracy
T
J
= –40°C to 125°C –0.7% 0.7%
I
VFB
Leakage current into VFB pin VFB = 2.1 V 100 nA
CURRENT REGULATION
V
ISET1
ISET voltage range 2 V
SRP-SRN current sense voltage
V
IREG_CHG
V
IREG_CHG
= V
SRP
– V
SRN
100 mV
range
Charge current set factor (amps of
K
ISET1
RSENSE = 10 mΩ 5 A/V
charge current per volt on ISET pin)
V
IREG_CHG
= 40 mV -3% 3%
V
IREG_CHG
= 20 mV -5% 5%
Charge current regulation accuracy
V
IREG_CHG
= 5 mV –25% 25%
V
IREG_CHG
= 1.5 mV –50% 50%
I
ISET
Leakage current into ISET pin V
ISET1
= 2 V 100 nA
INPUT UNDER-VOLTAGE LOCK-OUT COMPARATOR (UVLO)
V
UVLO
AC under-voltage rising threshold Measure on VCC 3.65 3.85 4 V
V
UVLO_HYS
AC under-voltage hysteresis, falling 350 mV
VCC LOWV COMPARATOR
V
LOWV_FALL
Falling threshold, disable charge Measure on VCC 4.1 V
V
LOWV_RISE
Rising threshold, resume charge 4.35 4.5 V
SLEEP COMPARATOR (REVERSE DISCHARGING PROTECTION)
V
SLEEP _FALL
SLEEP falling threshold V
VCC
– V
SRN
to enter SLEEP 40 100 150 mV
SLEEP hysteresis 500 mV
SLEEP rising delay VCC falling below SRN, Delay to pull up PG 1 µs
VCC rising above SRN, Delay to pull down
SLEEP falling delay 30 ms
PG
V
SLEEP_HYS
VCC falling below SRN, Delay to enter
SLEEP rising shutdown deglitch 100 ms
SLEEP mode
VCC rising above SRN, Delay to exit SLEEP
SLEEP falling powerup deglitch 30 ms
mode
OUT OVER-VOLTAGE COMPARATOR
V
OV_RISE
Over-voltage rising threshold As percentage of V
VFB
104%
V
OV_FALL
Over-voltage falling threshold As percentage of V
VFB
102%
INPUT OVER-VOLTAGE COMPARATOR (ACOV)
V
ACOV
AC over-voltage rising threshold Measured on VCC 31 32 33 V
V
ACOV_HYS
AC over-voltage falling hysteresis 1 V
AC over-voltage rising deglitch Delay to disable charge 1 ms
AC over-voltage falling deglitch Delay to resume charge 1 ms
THERMAL SHUTDOWN COMPARATOR
Thermal shutdown rising
T
SHUT
Temperature Increasing 145 °C
temperature
T
SHUT_HYS
Thermal shutdown hysteresis 15 °C
Thermal shutdown rising deglitch Temperature Increasing 100 µs
Thermal shutdown falling deglitch Temperature Decreasing 10 ms
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