Datasheet

LT3507A
24
3507af
TYPICAL APPLICATIONS
3.3V, 5V and 12V from a 24V Input with Ratiometric Tracking
5V, 3.3V, 2.5V and 1.8V with Coincident Tracking
V
IN1
BOOST1 UVLO
OVLO
BOOST3
SW3
FB3
V
C3
BIAS
DRIVE
FB4
PGOOD1
PGOOD2
PGOOD3
PGOOD1
PGOOD2
PGOOD3
SW1
FB1
V
C1
TRK/SS1
TRK/SS2
TRK/SS3
BOOST2
0.1µF
10µF
50V
22µF
D1
16.2k
1000pF
1.5nF
34.8k
L1 3.3µH
V
OUT1
3.3V
2A
V
IN
21V TO 27V
V
OUT2
5V
1.2A
L2 6.8µH
L3 10µH
BAT54
V
IN2
V
IN3
V
INSW
100k
49.9k
4.53k
OVLO = 29V
UVLO = 16V
100k
4.32k
V
OUT1
11k
41.2k
BAT54
BAT54
18.2k
SW2
FB2
V
C2
RT/SYNC TRK/SS4
GND
LT3507A
RUN1
RUN2
RUN3
0.1µF
0.1µF
22µF
10µF
D2
D3
24.3k
26.7k
SHDN
470nF
470pF
53.6k
68.1kNC
V
OUT1
D1: ON SEMI MBRS230LT3
D2, D3: ON SEMI MBRA130LT3
L1: COILCRAFT DO1813H-332ML
L2: COILCRAFT DO1813H-682ML
L3: COILCRAFT DO1813H-103ML
10k
3507A TA02
54.9k
f
SW
= 800kHz
10.2k
100k 100k
V
OUT3
12V
1A
140k
V
OUT1
V
IN1
BOOST1 UVLO
OVLO
BOOST2
SW2
FB2
V
C2
BIAS
DRIVE
FB4
PGOOD1
PGOOD2
PGOOD3
PGOOD1
PGOOD2
PGOOD3
SW1
FB1
V
C1
TRK/SS1
BOOST3
0.22µF
22µF
100µF
D1
18.7k
680pF
18.7k
4.7µH
V
OUT1
1.8V
2.7A
V
IN
6V TO 36V
V
OUT3
5V
1.8A
15µH
10µH
V
IN2
V
IN3
V
INSW
49.9k
18.2k
100k
V
OUT1
15k
SW3
FB3
V
C3
RT/SYNC TRK/SS4
GND
LT3507A
RUN1
RUN2
RUN3
0.22µF
0.22µF
22µF
22µF
D2
D3
24.3k
16.2k
SHDN
680pF
0.01µF
1000pF
53.6k
L1: COILCRAFT XAL4030-472
L2: COILCRAFT XAL4040-103
L3: COILCRAFT XAL4040-153
D1: DIODES, INC. B340A
D2, D3: DIODES, INC. B240A
Q1: ON SEMICONDUCTOR NSS30101LT1G
11k
11.5k
24.3k
3507A TA03
105k
f
SW
= 450kHz
10.2k
2.2nF
2.2µF
100k 100k
V
OUT2
3.3V
1.5A
V
OUT4
2.5V
0.3A
34.3k
TRK/SS3
TRK/SS2 TRK/SS2
V
OUT2
V
OUT2
15k
18.7k
35.7k
11.5k
TRK/SS2
Q1