LT3508
TYPICAL APPLICATIONS
3.3V and 5V Dual Output Step-Down Converter with Output Sequencing
V
IN
ON OFF
5.7V TO 36V
C1
4.7ꢀF
V
V
IN2
SHDN
D2
D1
IN1
OUT2
5V
1.4A
BOOST1
BOOST2
SW2
C2
0.22ꢀF
C3
0.22ꢀF
L2 10ꢀH
L1 6.8ꢀH
OUT1
3.3V
1.4A
SW1
D3
D4
LT3508
R1
35.7k
R2
56.2k
FB1
FB2
V
V
C2
C1
R3
R5
R4
10.7k
R6
43k
C5
10ꢀF
TRACK/SS1
TRACK/SS2
PG1
PG2
11.5k
51k
R7
100k
C6
150pF
C4
22ꢀF
GND R /SYNC
T
C7
100pF
R8
52.3k
C8
1nF
POWER
GOOD
f
= 700kHz
C1 TO C5: X5R OR X7R
D1, D2: MMSD4148
SW
3508 TA03
D3: DIODES INC. B140
D4: DIODES INC. B240A
1MHz, Wide Input Range 5V and 1.8V Outputs
V
IN
OUT1
5.7V TO 36V
C1
4.7ꢀF
V
IN1
V
IN2
D2
ON OFF
C2
SHDN
D1
BOOST1
BOOST2
SW2
L2
C3
L1 6.8ꢀH
3.3ꢀH
OUT1
5V
0.9A
0.1ꢀF
0.1ꢀF
OUT2
1.8V
1A
SW1
D3
D4
LT3508
R1
56.2k
R2
18.7k
FB1
FB2
V
V
C2
C1
R3
R5
R4
15.0k
R6
47k
C5
47ꢀF
TRACK/SS1
TRACK/SS2
PG1
PG2
10.7k
39k
R7
100k
C6
100pF
C4
10ꢀF
GND R /SYNC
T
C7
330pF
R8
33.2k
C8
1nF
C9
3.3nF
POWER
GOOD
f
= 1MHz
C1 TO C5: X5R OR X7R
D1, D2: MMSD4148
SW
3508 TA04
D3: DIODES INC. B240A
D4: DIODES INC. B120
3508fb
20
Linear [ Linear ]
