BQ24740_07 Datasheet, PDF (3/32 Pages) Texas Instruments – Host-controlled Multi-chemistry Battery Charger with Low Input Power Detect

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bq24740
SLUS736 – DECEMBER 2006
ADAPTER+
ADAPTER-
C16 C17
10 mF 10 mF
C18
10 mF
C1
10 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
EXTPWR
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
R5
10 kW
C4
1 mF
GPIO
C6 C7
10 mF 10 mF
SYSTEM
ACN
ACP
PVCC
ACDET
AGND
HIDRV
bq24740 PH
EXTPWR
BTST
SRSET
REGN
ACSET
VREF
LODRV
PGND
C8
1 mF
Q4
FDS6680A
C9
D1 BAT54 ^{0.1 mF}
C10
1 mF
L1
8.2 mH
C11
10 mF
C13
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-
IADSLP
DPMDET
LPMD
CELLS
CHGEN
VDAC
VADJ
SRP
SRN
BAT
LPREF
ISYNSET
R6
33 kW
VREF
R7
200 kW
R8
24.9 kW
C15
0.1 mF
ADC
C5 100 pF
IADAPT
PowerPad
R9 1.8 MW
(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 2. Typical System Schematic, Voltage and Current Programmed by Resistor
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