Datasheet

LT3844
21
3844fb
TYPICAL APPLICATIONS
All Ceramic Capacitor Application, 24V to 3.3V at 5A, f
SW
= 250kHz
V
IN
SHDN
C
SS
BURST_EN
V
FB
V
C
SYNC
f
SET
BOOST
TG
SW
V
CC
PGND
SENSE
+
SENSE
–
SGND
LT3844
3844 TA02
R5
63.4k
V
OUT
3.3V
5A
C2
680pF
C3
100pF
C
IN
22μF
s3
R4
10k
C1
2200pF
C5
0.22μF
C4
2.2μF
L1
6.8μH
C
OUT
100μF
s2
R
SENSE
0.01Ω
R1
3.32k
R2
5.62k
R3
1M
D1
D2
IN4148
M1
V
IN
24V
L1 = VISHAY, IHLP5050FD-01
M1 = VISHAY, SI7852DP
D1 = DIODES INC, PDS760
C
OUT
= TDK, C4532X5R0J107K
C
IN
= TDK, C4532X7R2A225K
(VOLTAGE
TRANSIENTS
UP TO 60V)
4
1
3
2
5
6
7
8
16
15
14
13
12
11
10
9
8V to 20V to 8V, 25W SEPIC Application
V
IN
SHDN
C
SS
BURST_EN
V
FB
V
C
SYNC
f
SET
BOOST
TG
SW
V
CC
PGND
SENSE
+
SENSE
–
SGND
LT3844
3844 TA03
R3
49.9k
V
OUT
8V
25W
C2
100pF
C3
680pF
C
IN2
1μF
25V
C
IN1
22μF
25V
s3
C1
3300pF
C5
22mF
25V
s3
C4
1μF
25V
R1
10k
R2
54.9k
R4
1M
R
SENSE
0.01Ω
R5
40.2k
D2
R6
10Ω
R7
10Ω
M1
V
IN
12V
L1 = COILTRONICS, VERSAPAC VP5-0083
C
IN
, C5, C
OUT2
= TDK, C4532X7R1E226M
D2 = ONSEMI, MBRD660
C
OUT
= SANYO OS-CON, 16SVP330M
C
IN
= VISHAY, Si7852DP
56pF
C
OUT2
22μF
25V
C
OUT1
330μF
16V
•
•
L1
L1
4
1
3
2
5
6
7
8
16
15
14
13
12
11
10
9
+