BQ24751B Datasheet, PDF (3/38 Pages) Texas Instruments – Host-Controlled Multi-Chemistry Battery Charger with Low Iq and System Power Selector

Not Recommended For New Designs
bq24751B
www.ti.com .......................................................................................................................................................... SLUS835A – JULY 2008 – REVISED MARCH 2009
ADAPTER +
ADAPTER -
/ACGOOD
R10
2Ω
C1
2.2 µF
P
Q1 (ACFET)
SI4435
P
Q2 (ACFET)
SI4435
C2
0.1 µF
RAC
0.010 Ω
C3
0.1 µF
R1
432 kΩ
1%
R2
66.5 kΩ
1%
VREF
R5
10 kΩ
R3
422 kΩ
1%
VREF
R8
100 kΩ
R9
66.5 kΩ
HOST
R4
71 kΩ
1%
VREF
R7
100 kΩ
R11
43 kΩ
C4
0.1 µF
GPIO
VREF
REGN
ADC
C5
100 pF
ACN
PVCC
ACP
/ACDRV
ACDET
/BATDRV
AGND
HIDRV
bq24751B ^PH
/ACGOOD
BTST
OVPSET
REGN
SRSET
ACSET
VREF
LEARN
CELLS
/CHGEN
VDAC
VADJ
IADAPT
LODRV
PGND
SRP
SRN
BAT
ACOP
PowerPad
C6 C7
10 µF 10 µF
SYSTEM
C8
0.1 µF
Q4
FDS6680A
L1
8.2 µH
P
RSR
0.010 Ω
D1
C9
BAT54 0.1 µF
C10
1 µF
C11
10 µF
C13
Q5 ^{0.1 µF}
FDS6680A
C14
0.1 µF
Q3(BATFET)
SI4435
C12
10 µF
PACK+
PACK-
C16
0.47 µF
C15
0.1 µF
(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 2. Typical System Schematic, Voltage and Current Programmed by Resistor
PART NUMBER
bq24751B
ORDERING INFORMATION
PACKAGE
28-PIN 5 x 5 mm QFN
ORDERING NUMBER
(Tape and Reel)
bq24751BRHDR
bq24751BRHDT
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 = 70°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 © 2008–2009, Texas Instruments Incorporated
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