BQ24640 Datasheet, PDF (5/25 Pages) Texas Instruments – High-Efficiency Synchronous Switch-Mode Super Capacitor Charger

bq24640
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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
Charge voltage regulation accuracy
I_VFB
Leakage current into VFB pin
CURRENT REGULATION
T_J = 0°C to 85°C
T_J = –40°C to 125°C
VFB = 2.1 V
–0.5%
–0.7%
2.1
V
0.5%
0.7%
100 nA
V_ISET1
V_{IREG_CHG}
ISET voltage range
SRP-SRN current sense voltage
range
V_{IREG_CHG} = V_SRP – V_SRN
2V
100 mV
K_ISET1
Charge current set factor (amps of
charge current per volt on ISET pin)
RSENSE = 10 mΩ
5
A/V
V_{IREG_CHG} = 40 mV
Charge current regulation accuracy ^{VIREG_CHG = 20 mV}
V_{IREG_CHG} = 5 mV
V_{IREG_CHG} = 1.5 mV
I_ISET
Leakage current into ISET pin
V_ISET1 = 2 V
INPUT UNDER-VOLTAGE LOCK-OUT COMPARATOR (UVLO)
-3%
-5%
–25%
–50%
3%
5%
25%
50%
100 nA
V_UVLO
AC under-voltage rising threshold
V_{UVLO_HYS}
AC under-voltage hysteresis, falling
VCC LOWV COMPARATOR
Measure on VCC
3.65 3.85
350
4V
mV
V_{LOWV_FALL}
Falling threshold, disable charge Measure on VCC
V_{LOWV_RISE}
Rising threshold, resume charge
SLEEP COMPARATOR (REVERSE DISCHARGING PROTECTION)
4.1
V
4.35 4.5 V
V_{SLEEP _FALL}
SLEEP falling threshold
SLEEP hysteresis
V_VCC – V_SRN to enter SLEEP
40 100 150 mV
500
mV
SLEEP rising delay
VCC falling below SRN, Delay to pull up PG
1
µs
V_{SLEEP_HYS}
SLEEP falling delay
SLEEP rising shutdown deglitch
VCC rising above SRN, Delay to pull down
PG
VCC falling below SRN, Delay to enter
SLEEP mode
30
ms
100
ms
SLEEP falling powerup deglitch
VCC rising above SRN, Delay to exit SLEEP
mode
30
ms
OUT OVER-VOLTAGE COMPARATOR
V_{OV_RISE}
Over-voltage rising threshold
V_{OV_FALL}
Over-voltage falling threshold
INPUT OVER-VOLTAGE COMPARATOR (ACOV)
As percentage of V_VFB
As percentage of V_VFB
104%
102%
V_ACOV
V_{ACOV_HYS}
AC over-voltage rising threshold
AC over-voltage falling hysteresis
AC over-voltage rising deglitch
Measured on VCC
Delay to disable charge
31
32
33 V
1
V
1
ms
AC over-voltage falling deglitch
Delay to resume charge
1
ms
THERMAL SHUTDOWN COMPARATOR
T_SHUT
Thermal shutdown rising
temperature
Temperature Increasing
145
°C
T_{SHUT_HYS}
Thermal shutdown hysteresis
Thermal shutdown rising deglitch
Temperature Increasing
15
°C
100
µs
Thermal shutdown falling deglitch Temperature Decreasing
10
ms
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