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BQ24740 Datasheet(PDF) 4 Page - Texas Instruments

Part No. BQ24740
Description  Host-controlled Multi-chemistry Battery Charger with Low Input Power Detect
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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BQ24740 Datasheet(HTML) 4 Page - Texas Instruments

 
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VREF
RAC
0.010 W
RSR
0.010 W
(1) Pull-uprailcouldbeeitherVREForothersystemrail
.
(2) SRSET/ACSET couldcomefromeitherDACorresistordividers .
Q1 (ACFET)
SI4435
Q3(BATFET)
SI4435
Controlledby
HOST
P
P
ACN
ACP
ACDET
EXTPWR
SRSET
ACSET
VREF
DAC
CELLS
CHGEN
VDAC
VADJ
DAC
ADC
IADAPT
HOST
PVCC
HIDRV
PH
BTST
REGN
LODRV
PGND
SRP
SRN
P
PACK+
PACK-
SYSTEM
ADAPTER +
ADAPTER -
/EXTPWR
AGND
bq24740
10 F
m
C1
432 kW
1%
66.5kW
1%
R1
R2
10kW
R3
1 F
m
C4
C2
C3
100 pF
C5
1 F
m
C8
Q4
FDS6680A
Q5
FDS6680A
0.1 F
m
C9
L1
8.2 H
m
D1
BAT54
1 F
m
C10
C14
0.1 F
m
C13
0.1 F
m
C12
10 F
m
C7
10 F
m
BAT
IADSLP
ISYNSET
R6
33 kW
DPMDET
R4
10 kW
LPMD
VREF
LPREF
R7
200 kW
R8
24.9 kW
R9
1.8 MW
C11
10 F
m
Q2 (ACFET)
SI4435
Controlledby
HOST
10 F
m
C6
C15
0.1 F
m
0.1 F
m
R5
10 kW
C19
10 F
m
C18
10 F
m
C17
10 F
m
0.1 F
m
PowerPad
PACKAGE THERMAL DATA
bq24740
SLUS736 – DECEMBER 2006
VIN = 20 V, VBAT = 3-cell Li-Ion, ICHARGE = 3 A, IADAPTER_LIMIT = 4 A
Figure 3. Typical System Schematic: Sensing Battery Discharge Current, When Adapter Removed. (Set
IADSLP at logic high)
ORDERING INFORMATION
Part number
Package
Ordering Number
Quantity
(Tape and Reel)
bq24740RHDR
3000
bq24740
28-PIN 5 x 5 mm QFN
bq24740RHDT
250
PACKAGE
θ
JA
TA = 70°C POWER RATING
DERATING FACTOR ABOVE TA = 25°C
QFN – RHD(1)(2)
39
°C/W
2.36 W
0.028 W/
°C
(1)
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
Web site at www.ti.com.
(2)
This data is based on using the JEDEC High-K board and the exposed die pad is connected to a Cu pad on the board. This is
connected to the ground plane by a 2x3 via matrix.
4
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