BQ24740_07 Datasheet, PDF (4/32 Pages) Texas Instruments – Host-controlled Multi-chemistry Battery Charger with Low Input Power Detect

bq24740
SLUS736 – DECEMBER 2006
www.ti.com
C17 C18
10 mF 10 mF
C19
10 mF
ADAPTER +
ADAPTER -
C1
10 mF
R1
P
P
Q1 (ACFET) Q2 (ACFET)
SI4435
SI4435
Controlled by
HOST
C2
432 kW
0.1 mF
1%
RAC
0.010 W
C3
0.1 mF
ACN
ACP
C6
10 mF
C7
10 mF
PVCC
C8 1 mF
/EXTPWR
66.5 kW
R2 _1%
VREF
R3 10 kW
ACDET
AGND
HIDRV
bq24740 ^PH
EXTPWR
BTST
DAC
SRSET
ACSET
VREF
HOST
C4 1 mF
R4 10 kW R5 10 kW
IADSLP
DPMDET
LPMD
CELLS
CHGEN
DAC
VDAC
VADJ
ADC
IADAPT
C5 100 pF
R9
(1) Pull-up rail could be either VREF or other system rail
(2) SRSET/ACSET could come from either DAC or resisto.r dividers
1.8 MW
.
REGN
LODRV
PGND
SRP
SRN
BAT
LPREF
ISYNSET
PowerPad
Q4
FDS6680A
L1
C9
D1 BAT54 ^{0.1 mF}
8.2 mH
C10 1 mF
C11
10 mF
C13
0.1 mF
Q5
FDS6680A
P
RSR
0.010 W
C14
0.1 mF
R6
33 kW
VREF
R7
200 kW
R8
24.9 kW
C15
0.1 mF
SYSTEM
Q3(BATFET)
SI4435
Controlled by
HOST
C12
10 mF
PACK+
PACK-
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)
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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