Datasheet

LTC4425
16
4425fa
For more information www.linear.com/LTC4425
Typical applicaTions
USB
C1
10µF
0805
R1
100k
µC
V
BUS
D0
D1
D2
NTC
CHRG
CLPROG PROG GND
BAT
GATE
LDO3V3
V
OUT
C/X
SW
LTC4088
L1
3.3µH
M1
+
LI-Ion
R4
2k
R3
2.94k
C2
0.1µF
0603
R5
8.2Ω
R2
100k
L1: COILCRAFT LPS4018-332MLC
M1: SILICONIX Si2333
R2: VISHAY-DALE NTHS0603N011-N1003F
C1, C3: MURATA GRM21BR61A106KE19
C2: MURATA GRM188R71C104KA01
CSC: CAP-XX HS203F
INSTANT-ON
C
SC
0.55F
HS203F
V
OUTV
IN
PFI
SEL
EN
PFO
PFI_RET
V
MID
V
IN
FB
PROG
GND
R6
2k
µC
R8
1.2M
R7
1.5M
LTC4425
4425 TA05
C3
10µF
0805
5V
V
IN
LOAD
High Current USB Charging with Power Path Control
3.3V Peak-Power/Back-up Supply
C
SC
0.55F
HS203F
V
OUTV
IN
PFI
SEL
EN
PFO
PFI_RET
V
MID
V
IN
FB
PROG
GND
2k
µC
1.2M
1.5M
LTC4425
4425 TA05a
SW1
PV
IN
V
IN
RUN/SS
R
T
SW2
PV
OUT
V
OUT
FB
LTC3533
10µF
5V
V
IN
≈5V
340k 6.49k
100µF
47pF
V
OUT
3.3V
1.5A
200k
0.1µF
107k
330pF
4.7pF
2.2µH
33.2k 200k
PGND
SGND
ONOFF
BURST
V
C
2.2µF
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