Datasheet

LT3759
28
3759fc
For more information www.linear.com/3759
TYPICAL APPLICATIONS
2.5V to 36V Input, 12V/1A Output SEPIC Converter
(Automotive 12V Regulator)
Efficiency vs Output Current Load Step Response at V
IN
= 12V
Frequency Foldback Waveforms When Output Short-Circuits
SENSE
LT3759
V
IN
DRIVE
V
IN
2.5V TO 36V
C
IN
4.7µF
50V
×4
41.2k
200kHz
C
DC
4.7µF
50V, X5R, ×2
GATE
PGOOD
FBX
GND
INTV
CC
EN/UVLO
SYNC
RT
SS
VC
L1A
L1BI
L1B
I
L1A
105k
118k
0.1µF
7.5k
22nF
15.8k
1%
105k
1%
0.005Ω
0.5W
4.7µF
10V
X5R
V
OUT
12V
0.5A, 2.5V ≤ V
IN
≤ 8V
2A, 8V < V
IN
≤ 36V
C
OUT2
10µF
25V
X5R
3759 TA05a
C
OUT1
47µF
20V
×4
D1
M1
100k
+
V
SW
M1: VISHAY SILICONIX Si7460DP
L1A, L1B: COILTRONICS DRQ127-150
D1: VISHAY 6CWQ06FN
OUTPUT CURRENT (A)
0
EFFICIENCY (%)
90
95
100
1.5 2.5
3759 TA05b
85
0.5 1
2
80
75
V
IN
= 12V
V
OUT
500mV/DIV
(AC)
I
OUT
1A/DIV
3759 TA05c
500µs/DIV
1.6A
0.4A
V
OUT
10V/DIV
V
SW
20V/DIV
I
L1A + L1B
5A/DIV
3759 TA05d
20µs/DIV