BQ24740_14 Datasheet, PDF (4/33 Pages) Texas Instruments – Host-Controlled Multi-Chemistry Battery Charger

bq24740
SLUS736C – DECEMBER 2006 – REVISED MARCH 2009............................................................................................................................................... www.ti.com
ADAPTER+
ADAPTER-
R10
2Ω
C1
2.2 µF
P
Q1 (ACFET)
SI4435
P
Q 2 (ACFET )
SI 4435
Controlled by
HOST
R1
432 kΩ
1%
C2
0.1 µF
R AC
0 .010 Ω
C3
0.1 µF
/EXTPWR
R2
66.5 kΩ
1%
VREF
R3
10 kΩ
DAC
HOST
R4
R5
C4
10 k Ω 10 k Ω
1 µF
DAC
ADC
C5
100 pF
D2
BAT54C
C6
C7
10 µF _{10 µF}
ACN
ACP
ACDET
AGND
bq 24740
EXTPWR
SRSET
ACSET
VREF
IADSLP
DPMDET
LPMD
CELLS
CHGEN
VDAC
VADJ
IADAPT
PVCC
C8
0.1 µF
Q3 (BATFET)
SI4435
Controlled by
HOST
HIDRV
PH
C9
BTST
D 1 BAT 54 ^{0.1 µF}
REGN
C10
1 µF
LODRV
PGND
Q4
FDS 6680 A
L1
8.2 µH
C 11
10 µF
P
R _SR
0 .010 Ω
C 13
0 .1 µF
Q5
FDS6680A
C 14
0.1 µF
SRP
SRN
BAT
LPREF
ISYNSET
PowerPad
R6
24 kΩ
VREF
R7
200 kΩ
R8
24.9 kΩ
C 15
0 .1 µF
C 12
10 µF
R9
1.8 MΩ
( 1 ) Pull- up rail could be either VREF or other system rail .
( 2 ) SRSET / ACSET could come from either DAC or resistor dividers.
V_IN = 20 V, V_BAT = 3-cell Li-Ion, I_CHARGE = 3 A, I_{ADAPTER_LIMIT} = 4 A
Figure 3. Typical System Schematic: Sensing Battery Discharge Current,
When Adapter Removed. (Set IADSLP at logic high)
SYSTEM
PACK+
PACK-
Part number
bq24740
ORDERING INFORMATION
Package
28-PIN 5 x 5 mm QFN
Ordering Number
(Tape and Reel)
bq24740RHDR
bq24740RHDT
Quantity
3000
250
PACKAGE THERMAL DATA
PACKAGE
QFN – RHD⁽¹⁾⁽²⁾
θ_JA
39°C/W
T_A = 70°C POWER RATING
2.36 W
DERATING FACTOR ABOVE T_A = 25°C
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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