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BQ24753RHDT Datasheet(PDF) 2 Page - Texas Instruments

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Part # BQ24753RHDT
Description  Host-Controlled Multi-Chemistry 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

BQ24753RHDT Datasheet(HTML) 2 Page - Texas Instruments

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DESCRIPTION (CONTINUED)
VREF
RAC
0.010 Ω
RSR
0.010 Ω
Q2 (ACFET)
SI4435
Q3(BATFET)
SI4435
P
P
ACN
ACP
ACDET
SRSET
ACSET
VREF
CELLS
VDAC
VADJ
ADC
IADAPT
HOST
PVCC
HIDRV
PH
BTST
REGN
LODRV
PGND
SRP
SRN
P
PACK+
PACK-
SYSTEM
ADAPTER +
ADAPTER -
/ACGOOD
AGND
bq24753
2.2 µF
C1
432 kΩ
1%
66.5 kΩ
1%
R1
R2
10 kΩ
R5
1 µF
C4
100 pF
C5
0.1 µF
C8
Q4
FDS6680A
Q5
FDS6680A
0.1 µF
C9
L1
8.2 µH
D1
BAT54
1 µF
C10
BAT
OVPSET
422 kΩ
1%
R3
71 kΩ
1%
R4
LEARN
ACOP
Q1 (ACFET)
SI4435
10 µF
C6
C15
0.1 µF
C16
0.47 µF
0.1 µF
C2
C3
2 Ω
R10
0.1 µF
PowerPad
10 µF
C7
10 µF
C12
C14
0.1 µF
C13
0.1 µF
C11
10 µF
GPIO
DAC
DAC
CHGEN
ACGOOD
ACDRV
BATDRV
bq24753
SLUS885A – DECEMBER 2008 – REVISED DECEMBER 2008........................................................................................................................................ www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
The bq24753 controls external switches to prevent battery discharge back to the input, connect the adapter to
the system, and to connect the battery to the system using 6-V gate drives for better system efficiency. For
maximum system safety, inrush-power limiting provides instantaneous response to high input voltage multiplied
by current. This AC Overpower protection (ACOP) feature limits the input-switch power to the programmed level
on the ACOP pin, and latches off if the high-power condition persists to prevent overheating.
The bq24753 features Dynamic Power Management (DPM) and input power limiting. These features reduce
battery charge current when the input power limit is reached to avoid overloading the AC adapter when supplying
the load and the battery charger simultaneously. A highly-accurate current-sense amplifier enables precise
measurement of input current from the AC adapter to monitor the overall system power.
(1) Pull-up rail could be either VREF or other system rail.
(2) SRSET/ACSET could come from either DAC or resistor dividers.
VIN = 20 V, VBAT = 3-cell Li-Ion, Icharge = 3 A, Iadapter_limit = 3.5 A
Figure 1. Typical System Schematic, Voltage and Current Programmed by DAC
2
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s) :bq24753


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