BQ24650 Datasheet, PDF (6/33 Pages) Texas Instruments – Synchronous Switch-Mode Battery Charge Controller for Solar Power With Maximum Power Point Tracking

bq24650
SLUSA75 – JULY 2010
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ELECTRICAL CHARACTERISTICS (continued)
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
REGN REGULATOR
V_{REGN_REG}
REGN regulator voltage
I_{REGN_LIM}
REGN current limit
BATTERY DETECTION
V_VCC > 10 V, MPPSET > 175 mV
V_REGN = 0 V, V_VCC > V_UVLO, MPPSET < 75 mV
5.7
6.0
6.3
V
40
mA
t_WAKE
I_WAKE
t_DISCHARGE
I_DISCHARGE
I_FAULT
I_QUAL
t_QUAL
V_WAKE
Wake timer
Wake current
Discharge timer
Discharge current
Fault current after a timeout fault
Termination qualification current
Termination qualification time
Wake threshold (with respect to V_REG)
Max time charge is enabled
R_SENSE = 10 mΩ
Max time discharge current is applied
Voltage on VFB to detect battery absent during
wake
500
ms
50
125
200 mA
1
sec
6
mA
2
mA
2
mA
250
ms
50
mV
V_DISCH
Discharge threshold
Voltage on VFB to detect battery absent during
discharge
1.55
V
PWM HIGH SIDE DRIVER (HIDRV)
R_{DS_HI_ON}
R_{DS_HI_OFF}
V_{BTST_REFRESH}
High side driver (HSD) turn-on resistance
High side driver turn-off resistance
Bootstrap refresh comparator threshold
Voltage
VBTST – VPH = 5.5 V
VBTST – VPH when low side refresh pulse is
requested
3.3
6Ω
1
1.4 Ω
4.0
4.2
V
PWM LOW SIDE DRIVER (LODRV)
R_{DS_LO_ON}
Low side driver (LSD) turn-on resistance
R_{DS_LO_OFF}
Low side driver turn-off resistance
PWM DRIVERS TIMING
4.1
7Ω
1
1.4 Ω
Driver dead-time
Dead time when switching between LSD and
HSD, No load at LSD and HSD
30
ns
PWM OSCILLATOR
V_{RAMP_HEIGHT}
PWM ramp height
PWM switching frequency
As percentage of VCC
7%
510
600
690 kHz
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 power-up
Delay from MPPSET > 175 mV to charger is
allowed to turn on
1.5
s
LOGIC IO PIN CHARACTERISTICS (STAT1, STAT2, TERM_EN)
V_{OUT_LOW}
STAT1, STAT2 output low saturation
voltage
Sink current = 5 mA
0.5
V
I_{OUT_HI}
V_{IN_LOW}
V_{IN_HI}
I_{IN_BIAS}
Leakage current
TERM_EN input low threshold voltage
TERM_EN input high threshold voltage
TERM_EN bias current
V = 32 V
V_{TERM_EN} = 0.5 V
1.2 µA
0.4
V
1.6
V
60 µA
6
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