Datasheet

LT3508
20
3508fd
3.3V and 5V Dual Output Step-Down Converter with Output Sequencing
TYPICAL APPLICATIONS
1MHz, 3.3V and 1.8V Outputs with Sequencing
V
IN
3.9V TO 16V
BOOST2
LT3508
V
IN2
V
IN1
SHDN
GND
3508 TA02
RT/SYNC
C7
150pF
C5
10µF
C4
47µF
C1
4.7µF
C2
0.1µF
C3
0.1µF
ON OFF
R6
39k
C6
330pF
R5
47k
R4
11.5k
R8
33.2k
f
SW
= 1MHz
R1
18.7k
R7
100k
R2
35.7k
R3
15.0k
L2 4.7µH
L1 3.3µH
D1
D2
D3 D4
POWER
GOOD
OUT2
3.3V
1.4A
OUT1
1.8V
1.4A
OUT2
C8
1nF
BOOST1
SW2
SW1
FB2FB1
V
C2
PG1
V
C1
TRACK/SS1
PG2TRACK/SS2
C1 TO C5: X5R OR X7R
D1, D2: MMSD4148
D3: DIODES INC. B140
D4: DIODES INC. B240A
V
IN
5.7V TO 36V
BOOST2
LT3508
V
IN2
V
IN1
SHDN
GND
3508 TA03
RT/SYNC
C7
100pF
C5
10µF
C4
22µF
C1
4.7µF
C2
0.22µF
C3
0.22µF
ON OFF
R6
43k
C6
150pF
R5
51k
R4
10.7k
R8
52.3k
f
SW
= 700kHz
R1
35.7k
R7
100k
R2
56.2k
R3
11.5k
L2 10µH
L1 6.8µH
D1
D2
D3 D4
POWER
GOOD
OUT2
5V
1.4A
OUT1
3.3V
1.4A
C8
1nF
BOOST1
SW2
SW1
FB2FB1
V
C2
PG1
V
C1
TRACK/SS1
PG2TRACK/SS2
C1 TO C5: X5R OR X7R
D1, D2: MMSD4148
D3: DIODES INC. B140
D4: DIODES INC. B240A