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BQ24750_07 Datasheet, PDF (8/38 Pages) Texas Instruments – Host-controlled Multi-chemistry Battery Charger with Integrated System Power Selector and AC Over-Power Protection
bq24750
SLUS735 – DECEMBER 2006
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
7.0 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
PVCC / BAT COMPARATOR (REVERSE DISCHARGING PROTECTION)
VPVCC-BAT_OP
Differential Voltage from PVCC to
BAT
–20
24
V
VPVCC-BAT_FALL PVCC to BAT falling threshold
VPVCC– VBAT to turn off ACFET
VPVCC-BAT__HYS PVCC to BAT hysteresis
PVCC to BAT Rising Deglitch
VPVCC– VBAT > VPVCC-BAT_RISE
PVCC to BAT Falling Deglitch
VPVCC– VBAT < VPVCC-BAT_FALL
INPUT UNDERVOLTAGE LOCK-OUT COMPARATOR (UVLO)
140 185
50
10
6
240 mV
mV
µs
µs
VUVLO
AC Under-voltage rising threshold
VUVLO_HYS
AC Under-voltage hysteresis, falling
ACN / BAT COMPARATOR
Measured on PVCC
3.5 4
260
4.5
V
mV
VACN-BAT_FALL
VACN-BAT_HYS
ACN to BAT falling threshold
ACN to BAT hysteresis
ACN to BAT rising deglitch
ACN to BAT falling deglitch
BAT OVERVOLTAGE COMPARATOR
VACN– VBAT to turn on BATDRV
VACN– VBAT > VACN-BAT_RISE
VACN– VBAT < VACN-BAT_FALL
175 285
50
20
6
340 mV
mV
µs
µs
VOV_RISE
Overvoltage rising threshold
VOV_FALL
Overvoltage falling threshold
CHARGE OVERCURRENT COMPARATOR
As percentage of VBAT_REG
As percentage of VBAT_REG
104
%
102
VOC
Charge over-current falling threshold As percentage of IREG_CHG
Minimum Current Limit (SRP-SRN)
145
%
50
mV
CHARGE UNDERCURRENT COMPARATOR (SYNCHRONOUS TO NON-SYNCHRONOUS TRANSITION)
VISYNSET_FALL
Charge undercurrent falling threshold Changing from synchronous to
non-sysnchronous
9.75 13 16.25 mV
VISYNSET_HYS
Charge undercurrent rising hysteresis
Charge undercurrent, falling-current
deglitch
Charge undercurrent, rising-current
deglitch
VIREG_DPM < VISYNSET
8
mV
20
µs
640
INPUT OVER-POWER COMPARATOR (ACOP)
VACOC
ACOC Gain for initial ACOC current Begins 700 ms after ACDET
limit limit (Percentage of programmed Input current limited to this threshold for
VIREG_DPM)
fault protection
150
%
VIREG_DPM
VACOC_CEILING
Maximum ACOC input current limit
(VACP–VACN)max
Internally limited ceiling
VACOC_MAX = (VACP–VACN)max
100
mV
ACOP Latch Blankout Time with
ACOC active
(begins 500 ms after ACDET)
Begins 700 ms after ACDET
(does not allow ACOP latch-off, and no
ACOP source current)
2
ms
VACOP
ACOP pin latch-off threshold voltage
(See ACOP in Terminal Functions
table)
1.95 2 2.05
V
KACOP
IACOP_SINK
Gain for ACOP Source Current when
in ACOC
ACOP Sink Current when not in
ACOC
ACOP Latch is reset by going below
ACDET or UVLO
Current source on when in ACOC limit.
Function of voltage across power FET
IACOP_SOURCE = KACOP× (VPVCC -VACP)
Current sink on when not in ACOC
18
µA / V
5
µA
8
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