Datasheet

LTC4425
16
4425f
LTC4425
V
IN
FB
PFI
SEL
EN
PFO
PFI_RET
V
OUT
V
MID
PROG
GND
C
SP1
1F
C
SP2
1F
µC
R8
1.2M
1.5M
11k
R6
2k
V
OUT
SW
I
SENSE
FB
I
LIM
V
IN
59k
28.7k
GND
2.2μF
LT3663
RUN
BOOST
OFFON
0.1µF
D1
22µF
5V INSTANT-ON
6.8µH
D1: DFLS240
CSP1, CSP2:
12V
4425 TA07
5V
HIGH-PEAK POWER,
OR BACKUP SUPPLY
12V Input to 5V Outputs with Input Voltage Monitoring
TYPICAL APPLICATIONS
C
SP1
1F
C
SP2
1F
3.3V
5V
V
OUTV
IN
V
OUT
(5V)
V
IN
SHDN
RT GND V
C
FB
SW
BOOST
PFI
SEL
EN
PFO
PFI_RET
V
MID
FB
PROG
GND
R6
2k
1.2M
2.1M
µC
R8
1.2M
R7
1.5M
LTC4425
LT3505
4425 TA06
12V
10µF
68pF
11.3k
61.1k
10µH
0.1µF
D1
D2
69.8k75k
70pF1µF
D1: 1N4148
D2: MBRM140
CSP1, CSP2: CAP-XX HS203F
HIGH PEAK-
POWER LOAD
12V to 5V/3.3V High Peak Power Supply