BQ24705 Datasheet, PDF (3/30 Pages) Texas Instruments – Host-Controlled Multi-Chemistry Battery Charger With Low Input Power Detect

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bq24705
SLUS779 – DECEMBER 2007
ADAPTER+
ADAPTER-
R5
4W
C1
1 mF
P
P
Q1 (ACFET) Q2 (ACFET)
SI4435
SI4435
Controlled by
HOST
C2
R1
0.1 mF
432 kW
1%
R_AC
0.010 W
C3
0.1 mF
ACGOOD
R2
66.5 kW
1%
VREF
R3
10 kW
HOST
R11
66.5 kW
R4
10 kW
R9
42 kW
R10
100 kW
R12 100 kW
C4
1 mF
GPIO
C6 C7
10 mF 10 mF
SYSTEM
ACN
ACP
PVCC
ACDET
AGND
HIDRV
bq24705 PH
ACGOOD
BTST
SRSET
REGN
ACSET
VREF
LODRV
PGND
C8
0.1 mF
Q4
FDS6680A
C9
D1 BAT54 ^{0.1 mF}
C10
1 mF
L1
4.7 mH
C11
10 mF
C^C1¹3³
Q5 ^{0.1 mF}
FDS6680A
P
R SR
0.010 W
C14
0.1 mF
Q3(BATFET)
SI4435
Controlled by
HOST
C12
10 mF
PACK+
PACK-
DPMDET
LPMD
CELLS
CHGEN
SRP
SRN
BAT
ISYNSET
R6
68 kW
C15
0.1 mF
ADC
C5 100 pF
VADJ
IADAPT
PowerPad
(1) Pull-up rail could be either VREF or other system rail .
(2) SRSET/ACSET could come from either DAC or resistor dividers.
A. V_IN = 20 V, V_BAT = 3-cell Li-Ion, I_CHARGE = 3 A, I_{ADAPTER_LIMIT} = 4 A
Figure 3. Typical System Schematic, Voltage and Current Programmed by Resistor
Part Number
bq24705
ORDERING INFORMATION
Package
24-PIN 4 x 4 mm QFN
Ordering Number
(Tape and Reel)
bq24705RGER
bq24705RGET
Quantity
3000
250
PACKAGE THERMAL DATA
PACKAGE
QFN – RGE⁽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.
Copyright © 2007, Texas Instruments Incorporated
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