BQ24650 Datasheet, PDF (4/33 Pages) Texas Instruments – Synchronous Switch-Mode Battery Charge Controller for Solar Power With Maximum Power Point Tracking

bq24650
SLUSA75 – JULY 2010
www.ti.com
ELECTRICAL CHARACTERISTICS
5.0V ≤ V_VCC ≤ 28V, –40°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 UNITS
OPERATING CONDITIONS
V_{VCC_OP}
VCC input voltage operating range
QUIESCENT CURRENTS
5
28
V
Total battery discharge current (sum of
currents into VCC, BTST, PH, SRP, SRN,
VFB), VFB ≤ 2.1V
VCC < VBAT, VCC > V_UVLO (SLEEP)
I_BAT
Battery discharge current (sum of currents ^{VCC > VBAT, VCC > V}UVLO^{, CE = LOW}
into BTST, PH, SRP, SRN, VFB), VFB ≤
2.1V
VCC > VBAT, VCC > V_VCCLOWV,
CE = HIGH, Charge done
15 µA
5 µA
5 µA
VCC > VBAT, VCC > V_UVLO, CE = LOW
I_AC
Adapter supply current (sum of current into
VCC pin)
VCC > VBAT, VCC > V_VCCLOWV,
CE = HIGH, charge done
VCC > VBAT, VCC > V_VCCLOWV,
CE = HIGH, Charging, Qg_total = 10nC [1]
0.7
1 mA
2
3 mA
25
mA
CHARGE VOLTAGE REGULATION
V_REG
Feedback regulation voltage
Charge voltage regulation accuracy
I_VFB
Leakage current into VFB pin
CURRENT REGULATION – FAST CHARGE
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_{IREG_CHG}
SRP-SRN current sense voltage range
Charge current regulation accuracy
CURRENT REGULATION – PRE-CHARGE
V_{IREG_CHG} = V_SRP – V_SRN
V_{IREG_CHG} = 40 mV
–3%
40
mV
3%
V_PRECHG
Precharge current sense voltage range
Precharge current regulation accuracy
CHARGE TERMINATION
V_{IREG_PRCHG} = V_SRP – V_SRN
V_{IREG_PRECH} = 4 mV
–25%
4
mV
25%
V_TERMCHG
Termination current sense voltage range
Termination current accuracy
Deglitch time for termination (both edges)
V_ITERM = V_SRP – V_SRN
V_ITERM = 4 mV
–25%
4
mV
25%
100
ms
t_QUAL
Termination qualification time
I_QUAL
Termination qualification current
INPUT VOLTAGE REGULATION
V_BAT > V_RECH and I_CHG < I_TERM
Discharge current once termination is detected
250
ms
2
mA
V_MPPSET
MPPSET regulation voltage
Input voltage regulation accuracy
–0.6%
1.2
V
0.6%
I_MPPSET
Leakage current into MPPSET pin
V_{MPPSET_CD}
MPPSET shorted to disable charge
V_{MPPSET_CE}
MPPSET released to enable charge
INPUT UNDER-VOLTAGE LOCK-OUT COMPARATOR (UVLO)
V_MPPSET = 7 V, T_A = 0 – 85°C
1 µA
75 mV
175
mV
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
4
V
mV
V_{VCC LOWV_fall}
Falling threshold, disable charge
Measure on VCC
V_{VCC LOWV_rise}
Rising threshold, resume charge
SLEEP COMPARATOR (REVERSE DISCHARGING PROTECTION)
4.1
V
4.35
V
V_{SLEEP _FALL}
V_{SLEEP_HYS}
SLEEP falling threshold
SLEEP hysteresis
SLEEP rising shutdown deglitch
V_VCC – V_SRN to enter SLEEP
VCC falling below SRN
40
100
150 mV
500
mV
100
ms
SLEEP falling powerup deglitch
VCC rising above SRN, Delay to exit SLEEP
mode
30
ms
4
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