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bq24753ARHDT Datasheet(PDF) 8 Page - Texas Instruments

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Part # bq24753ARHDT
Description  Host-Controlled Li-Ion and Li-Polymer Battery Charger with Low Iq and System Power Selector
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

bq24753ARHDT Datasheet(HTML) 8 Page - Texas Instruments

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bq24753A
SLUS920 – JULY 2009....................................................................................................................................................................................................... www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
7 V
≤ VPVCC ≤ 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
BAT SHORT (UNDERVOLTAGE) COMPARATOR
VBAT_SHORT_FALL
VBAT falling threshold to begin C/8
VBAT falling
2.75
2.9
3.05
V/cell
charge
VBAT_SHORT_HYS
BATSHORT hysteresis
VBAT rising
230
250
270
mV/cell
Deglitch time of VBAT rising to resume
VBAT > VBAT_SHORT+VBAT_SHORT_HYS
1.5
full charge
s
Deglitch time of VBAT falling to begin
VBAT < VBAT_SHORT
1.5
C/8 charge
BATSHORT EXIT delay to turn on
BATFET and turn off ACFET when
600
ms
LEARN=HIGH
BATSHORT ENTRY delay to turn off
BATFET and turn on ACFET when
10
µs
LEARN=HIGH
CHARGE OVERCURRENT COMPARATOR
VOC
Charge overcurrent rising threshold
As percentage of IREG_CHG
145%
OCP Floor
Minimum overcurrent current limit
Measure at (SRP-SRN)
50
mV
CHARGE UNDERCURRENT COMPARATOR (SYNCHRONOUS TO NON-SYNCHRONOUS TRANSITION)
VISYNSET_FALL
Charge undercurrent falling threshold
Changing from synchronous to non-synchronous
9.75
13
16.25
mV
VISYNSET_HYS
Charge undercurrent rising hysteresis
8
mV
Charge undercurrent, falling-current
20
deglitch
VIREG_DPM < VISYNSET
µs
Charge undercurrent, rising-current
640
deglitch
INPUT OVERPOWER COMPARATOR (ACOP)
ACOC Gain for initial ACOC current
Begins 700 ms after ACDET, VACSET=1V
%
VACOC
limit (Percentage of programmed
Input current limited to this threshold for fault
250
265
283
VIREG_DPM
VIREG_DPM)
protection
Maximum ACOC input current limit
Internally limited ceiling,
VACOC_CEILING
100
mV
(VACP–VACN)max
VACOC_MAX = (VACP–VACN)max
ACOP Latch Blankout Time with ACOC
Begins 700 ms after ACDET
2
active
(does not allow ACOP latch-off, and no ACOP
ms
(begins 700 ms after ACDET)
source current)
ACOP pin latch-off threshold voltage
VACOP
(See ACOP in Terminal Functions
1.95
2
2.05
V
table)
Current source on when in ACOC limit. Function of
Gain for ACOP Source Current when in
KACOP
voltage across power FET
18
µA / V
ACOC
IACOP_SOURCE = KACOP ×(VPVCC -VACP)
ACOP Sink Current when not in ACOC
IACOP_SINK
ACOP Latch is reset by going below
Current sink on when not in ACOC
5
µA
ACDET or UVLO
VACN-SHORT
ACN Short protection threshold latching
ACN < 2.4 V, ACDET > 2.4 V
2.4
V
INPUT OVERVOLTAGE COMPARATOR (ACOV)
AC Overvoltage rising threshold on
VACOV
OVPSET
Measured on OVPSET
3.007
3.1
3.193
V
(See OVPSET in Table 1)
AC Overvoltage rising deglitch
1.3
VACOV_HYS
ms
AC Overvoltage falling deglitch
1.3
THERMAL SHUTDOWN COMPARATOR
TSHUT
Thermal shutdown rising temperature
Temperature Increasing
155
°C
TSHUT_HYS
Thermal shutdown hysteresis, falling
20
°C
BATTERY SWITCH (BATDRV) DRIVER
RDS(off)_BAT
BATFET Turn-off resistance
VACN > 5 V
160
RDS(on)_BAT
BATFET Turn-on resistance
VACN > 5 V
3
k
VBATDRV_REG = VACN – VBATDRV when
VBATDRV_REG
BATFET drive voltage
6.5
V
VACN > 5 V and BATFET is on
8
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Copyright © 2009, Texas Instruments Incorporated
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