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BQ24745 Datasheet(PDF) 8 Page - Texas Instruments

Part # BQ24745
Description  SMBus-Controlled Multi-Chemistry Battery
Download  39 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

BQ24745 Datasheet(HTML) 8 Page - Texas Instruments

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bq24745
SLUS761D
– DECEMBER 2007 – REVISED OCTOBER 2011
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
7 V
≤ VDCIN ≤ 24 V, 0°C < TJ < 125°C, typical values are at TA = 25°C, with respect to AGND (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
THERMAL SHUTDOWN COMPARATOR
TSHUT
Thermal shutdown rising temperature
Temperature Increasing
155
°C
TSHUT_HYS
Thermal shutdown hysteresis, falling
20
PWM HIGH SIDE DRIVER (UGATE)
RDS_HI_ON
High-side driver (HSD) turnon resistance
VBOOT – VPHASE = 5.5 V
6
RDS_HI_OFF
High-side driver turnoff resistance
VBOOT – VPHASE = 5.5 V
1
Bootstrap refresh comparator threshold
VBOOT – VPHASE when low-side refresh pulse
VBOOT_REFRESH
4
V
voltage
is requested
IBOOT_LEAK
BOOT leakage current when charge enabled
High side is on; charge enabled
200
μA
PWM LOW SIDE DRIVER (LGATE)
RDS_LO_ON
Low-side driver (LSD) turnon resistance
6
RDS_LO_OFF
Low-side driver turnoff resistance
1
PWM DRIVERS TIMING
Dead time when switching between LGATE
Driver dead time
30
ns
and UGATE , no load at LGATE and UGATE
PWM OSCILLATOR
FSW
PWM switching frequency
240
360
kHz
VRAMP_HEIGHT
PWM ramp height
As percentage of DCIN
6.67
%DCIN
QUIESCENT CURRENT
Total off-state battery current from CSOP,
VVFB = 16.8 V, VACIN < 0.6 V,
IOFF_STATE
7
10
μA
CSON, VFB, DCIN, BOOT, PHASE, etc
VDCIN > 5 V, 0°C ≤ TJ ≤ 85°C
VVFB = 16.8 V, 0.6V < VACIN < 2.4 V,
IBAT_ON
Battery on-state quiescent current
0.7
1
mA
VDCIN > 5 V
Charge is disabled: VVFB = 16.8 V,
IBAT_LOAD_CD
Internal battery load current, charge disabled
0.7
1
mA
VACIN > 2.4 V, VDCIN > 5 V
Charge is enabled: VVFB = 16.8 V,
IBAT_LOAD_CE
Internal battery load current, charge enabled
6
10
12
mA
VACIN > 2.4 V, VDCIN > 5 V
IAC
Adapter quiescent current
Charge disabled, VDCIN = 20 V
0.7
1
mA
Charge enabled, VDCIN = 20 V, converter
IAC_SWITCH
Adapter switching quiescent current
25
mA
running
INTERNAL SOFT START (8 Steps to Regulation Current ICHG)
Soft-start steps
8
step
Soft-start step time
1.5
ms
CHARGER SECTION POWER-UP SEQUENCING
Delay from when adapter is detected to when
Charge-enable delay after power up
1.5
ms
the charger is allowed to turn on
CHARGE UNDERCURRENT COMPARATOR (CYCLE-BY-CYCLE SYNCHRONOUS TO NON-SYNCHRONOUS)
Cycle-by-cycle, (CSOP-CSON) voltage,
Cycle-by-cycle synchronous to
VUCP
falling, LGATE turns off and latches off until
5
10
15
mV
non-synchronous transition threshold
next cycle
Blankout time after LGATE turns on
Blankout comparator after LGATE turns on
100
ns
LOGIC INPUT PIN CHARACTERISTICS (CE)(2) Pull-up CE with
≥2.2 kΩ resistor or directly to VREF.
VIN_LO
Input low-threshold voltage
0.8
V
VIN_HI
Input high-threshold voltage
2.1
VBIAS
Input bias current
V = 0 TO VVDDP
1
μA
OPEN-DRAIN LOGIC OUTPUT PIN CHARACTERISTICS (ACOK, ICOUT)
VOUT_LO
Output low saturation voltage
Sink current = 5 mA
0.5
V
VDDSMB INPUT SUPPLY FOR SMBus
VVDDSMB_RANGE
VDDSMB input voltage range
2.7
5.5
V
VVDDSMB_UVLO_
VDDSMB undervoltage lockout threshold
VVDDSMB rising
2.4
2.5
2.6
V
Threshold_Rising
voltage, rising
VVDDSMB_UVLO_
VDDSMB undervoltage lockout hysteresis
VVDDSMB falling
100
150
200
V
Hyst_Rising
voltage, falling
(2)
Pull up CE with
≥ 2-kΩ resistor, or connect directly to VREF.
8
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Copyright
© 2007–2011, Texas Instruments Incorporated
Product Folder Link(s) :bq24745


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