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BQ24751 Datasheet(PDF) 2 Page - Texas Instruments

Part No. BQ24751
Description  Host-controlled Multi-chemistry Battery Charger with System Power Selector, AC Over-Power Protection, and Programmable OVP
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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BQ24751 Datasheet(HTML) 2 Page - Texas Instruments

 
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DESCRIPTION (CONTINUED)
VREF
RAC
RSR
(1) Pull-uprailcouldbeeitherVREForothersystemrail .
(2) SRSET/ACSET couldcomefromeitherDACorresistordividers .
Q2 (ACFET)
SI4435
Q3(BATFET)
SI4435
P
P
ACN
ACP
ACDRV
ACDET
ACGOOD
SRSET
ACSET
VREF
DAC
CELLS
CHGEN
VDAC
VADJ
DAC
ADC
IADAPT
HOST
PVCC
BATDRV
HIDRV
PH
BTST
REGN
LODRV
PGND
SRP
SRN
P
PACK+
PACK-
SYSTEM
ADAPTER+
ADAPTER-
ACGOOD
AGND
bq24751
R1
R2
66.5
kW
10kW
R4
C4
100pH
C5
C8
Q4
FDS6680A
Q5
FDS6680A
C9
L1
D1
BAT54
1 F
m
C10
C4
BAT
OVPSET
LEARN
ACOP
Q1 (ACFET)
SI4435
R3422kW
C3
C2
0.1 F
m
0.1 F
m
0.010 W
1 F
m
C6
10 F
m
C7
10 F
m
0.010 W
C12
10 F
m
0.1 F
m
C13
0.1 F
m
C11
10 F
m
0.1 F
m
C15
0.1 F
m
C16
0.47 F
m
1 F
m
432k
1%
W
8.2 H
m
PowerPad
C19
10 F
m
C18
10 F
m
C17
10 F
m
R571kW
R6100kW
bq24751
SLUS734 – DECEMBER 2006
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 bq24751 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 Over-Power 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 bq24751 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.
TYPICAL APPLICATION
VIN = 20 V, VBAT = 3-cell Li-Ion, Icharge = 3 A, Iadapter_limit = 4 A
Figure 1. Typical System Schematic, Voltage and Current Programmed by DAC
2
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