BQ24721 Datasheet, PDF (22/48 Pages) Texas Instruments – ADVANCED MULTI-CHEMISTRY AND MULTI-CELL SYNCHRONOUS SWITCH-MODE CHARGER AND SYSTEM POWER SELECTOR

bq24721
SLUS683 – NOVEMBER 2005
Typical bq24721 Narrow VDC (NVDC) Application (3 sense resistors)
www.ti.com
ADAPTER +
C1
10uF
ADAPTER -
PACK
THERMISTOR
SENSE
ACGOOD
EMBEDDED
CONTROLLER
HOST
SMBus
IRQ
A/D
Q1
SI4435
R1
0.010
R3
464k
1%
C7
0.1uF
PACK+
C6
1uF
D1
BAT54C
C8
0.1uF
C9
0.1uF
R4
VREF5
33.2k
1%
R5
C10
5.6k
1uF
1%
R13
118k
1%
VREF5
R6 R7 R8
10k 10k 10k
C11
0.1uF
bq24721
VCC
ACDRV
SYS
Q2
SI4435
SYSTEM
C2
10uF
ACN
ACP
BATDRV
PVCC
BYPASS
ACDET
VREF5
AGND
TS
HIDRV
PH
BTST
REGN
CHGEN
LODRV
PGND
SYNP
SYNN
SRP
SRN
BAT
EAO
EAI
FBO
SCL
SDA
ALARM
ISYNSET
C3
4x10uF
Q3
FDS6670A _L1
C12, 0.1uF
10uH
R2
0.010
Q5
SI4435
PACK+
D2
BAT54
C13, 1uF _C4
Q4
2x10uF
FDS6670A
C17
0.1uF
OPTIONAL
C14
0.1uF
C15
0.1uF
C5
2x10uF
C16
0.1uF
PACK-
C18
0.1uF
OPTIONAL
C20
R9
51pF 7.5k
C21
2000pF
C19
0.1uF
R10
20k
C22
130pF
R11
200k
R12
33k
IOUT
POWERPAD
SHORT POWERPAD TO
PGND AND AGND
Figure 55. bq24721 SBS-Like SMBus Host Control, NVDC (no system power selector)
With 3 Sense Resistors
22