Datasheet

bq24650
SLUSA75 –JULY 2010 www.ti.com
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 V
VCC
> 10 V, MPPSET > 175 mV 5.7 6.0 6.3 V
I
REGN_LIM
REGN current limit V
REGN
= 0 V, V
VCC
> V
UVLO
, MPPSET < 75 mV 40 mA
BATTERY DETECTION
t
WAKE
Wake timer Max time charge is enabled 500 ms
I
WAKE
Wake current R
SENSE
= 10 mΩ 50 125 200 mA
t
DISCHARGE
Discharge timer Max time discharge current is applied 1 sec
I
DISCHARGE
Discharge current 6 mA
I
FAULT
Fault current after a timeout fault 2 mA
I
QUAL
Termination qualification current 2 mA
t
QUAL
Termination qualification time 250 ms
Voltage on VFB to detect battery absent during
V
WAKE
Wake threshold (with respect to V
REG
) 50 mV
wake
Voltage on VFB to detect battery absent during
V
DISCH
Discharge threshold 1.55 V
discharge
PWM HIGH SIDE DRIVER (HIDRV)
R
DS_HI_ON
High side driver (HSD) turn-on resistance VBTST – VPH = 5.5 V 3.3 6 Ω
R
DS_HI_OFF
High side driver turn-off resistance 1 1.4 Ω
Bootstrap refresh comparator threshold VBTST – VPH when low side refresh pulse is
V
BTST_REFRESH
4.0 4.2 V
Voltage requested
PWM LOW SIDE DRIVER (LODRV)
R
DS_LO_ON
Low side driver (LSD) turn-on resistance 4.1 7 Ω
R
DS_LO_OFF
Low side driver turn-off resistance 1 1.4 Ω
PWM DRIVERS TIMING
Dead time when switching between LSD and
Driver dead-time 30 ns
HSD, No load at LSD and HSD
PWM OSCILLATOR
V
RAMP_HEIGHT
PWM ramp height As percentage of VCC 7%
PWM switching frequency 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
Delay from MPPSET > 175 mV to charger is
Charge-enable delay after power-up 1.5 s
allowed to turn on
LOGIC IO PIN CHARACTERISTICS (STAT1, STAT2, TERM_EN)
STAT1, STAT2 output low saturation
V
OUT_LOW
Sink current = 5 mA 0.5 V
voltage
I
OUT_HI
Leakage current V = 32 V 1.2 µA
V
IN_LOW
TERM_EN input low threshold voltage 0.4 V
V
IN_HI
TERM_EN input high threshold voltage 1.6 V
I
IN_BIAS
TERM_EN bias current V
TERM_EN
= 0.5 V 60 µA
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