LT3757/LT3757A
31
3757afd
Typical applicaTions
5.5V to 36V Input, 12V/2A Output SEPIC Converter
Efficiency vs Output Current Load Step Waveforms
Start-Up Waveforms Frequency Foldback Waveforms When Output Short-Circuits
SENSE
LT3757A
V
IN
V
IN
5.5V TO 36V
C
IN1
4.7µF
50V
×2
C
DC
4.7µF
50V, X5R, ×2
4.7µF
10V
X5R
V
OUT
12V
2A
0.01Ω
1W
M1
41.2k
300kHz
GATE
FBX
GND
INTV
CC
SHDN/UVLO
SYNC
RT
SS
C
IN2
4.7µF
50V
×2
105k
46.4k
0.1µF
6.8nF
10k
L1A
L1B
I
L1B
D1
C
IN1
, C
DC
: TAIYO YUDEN UMK316BJ475KL
C
IN2
: KEMET T495X475K050AS
C
OUT1
: KEMET T495X476K020AS
C
OUT2
: TAIYO YUDEN TMK432BJ106MM
D1: ON SEMI MBRS360T3G
L1A, L1B: COILTRONICS DRQ127-4R7 (*COUPLED INDUCTORS)
M1: VISHAY SILICONIX Si7460DP
3757 TA06a
105k
1%
15.8k
1%
C
OUT1
47µF
20V
×4
C
OUT2
10µF
25V
X5R
+
V
SW
I
L1A
V
C
+
2ms/DIV
V
OUT
5V/DIV
I
L1A
+ I
L1B
5A/DIV
3757 TA06d
V
IN
= 12V
50µs/DIV
V
OUT
10V/DIV
V
SW
20V/DIV
I
L1A
+ I
L1B
5A/DIV
3757 TA06e
V
IN
= 12V
OUTPUT CURRENT (A)
0.001
20
EFFICIENCY (%)
30
40
50
60
70
80
90
100
0.01
0.1 1
3757 TA06b
10
V
IN
= 16V
V
IN
= 8V
500µs/DIV
V
OUT
2V/DIV
AC-COUPLED
I
OUT
2A/DIV
0A
2A
3757 TA06c
V
IN
= 12V
LT3757/LT3757A
32
3757afd
Typical applicaTions
5V to 12V Input, ±12V/0.4A Output SEPIC Converter
Nonisolated Inverting SLIC Supply
SENSE
LT3757
V
IN
V
IN
5V TO 12V
C
IN1
1µF
16V, X5R
C
IN2
47µF
16V
C
DC1
4.7µF
16V, X5R
C
DC2
4.7µF
16V
X5R
C
OUT2
4.7µF
16V, X5R
×3
V
OUT1
12V
0.4A
V
OUT2
–12V
0.4A
C
OUT2
4.7µF
16V, X5R
×3
C
VCC
4.7µF
10V
X5R
0.02Ω
M1
30.9k
400kHz
D1, D2: MBRS140T3
T1: COILTRONICS VP1-0076 (*PRIMARY = 4 WINDINGS IN PARALLEL)
M1: SILICONIX/VISHAY Si4840BDY
GATE
FBX
GND
INTV
CC
SHDN/UVLO
SYNC
RT
SS
+
105k
46.4k
0.1µF 100pF
22k
6.8nF
T1
1,2,3,4
D1
GND
1.05k
1%
158Ω
1%
D2
5
6
3757 TA07
V
C
SENSE
LT3757
V
IN
V
IN
5V TO 16V
C
IN
22µF
25V, X5R
×2
C2
10µF
50V
X5R
D1
DFLS160
C
VCC
4.7µF
10V, X5R
C3
22µF
25V
X5R
C4
22µF
25V
X5R
C
OUT
3.3µF
100V
GND
C5
22µF
25V
X5R
V
OUT1
–24V
200mA
V
OUT1
–72V
200mA
0.012Ω
0.5W
M1
Si7850DP
63.4k
200kHz
GATE
FBX
GND
INTV
CC
SHDN/UVLO
SYNC
RT
SS
R2
105k
R1
46.4k
0.1µF
100pF
15.8k
464k
9.1k
10nF
T1
1,2,3
4
D2
DFLS160
5
D3
DFLS160
6
VP5-0155 (PRIMARY = 3 WINDINGS IN PARALLEL)
3757 TA08
V
C
LT3757/LT3757A
33
3757afd
package DescripTion
3.00 ±0.10
(4 SIDES)
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2).
CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
0.40 ± 0.10
BOTTOM VIEW—EXPOSED PAD
1.65 ± 0.10
(2 SIDES)
0.75 ±0.05
R = 0.125
TYP
2.38 ±0.10
(2 SIDES)
15
106
PIN 1
TOP MARK
(SEE NOTE 6)
0.200 REF
0.00 – 0.05
(DD) DFN REV C 0310
0.25 ± 0.05
2.38 ±0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
1.65 ±0.05
(2 SIDES)2.15 ±0.05
0.50
BSC
0.70 ±0.05
3.55 ±0.05
PACKAGE
OUTLINE
0.25 ± 0.05
0.50 BSC
DD Package
10-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1699 Rev C)
PIN 1 NOTCH
R = 0.20 OR
0.35 × 45°
CHAMFER

LT3757EDD#PBF

Mfr. #:
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Boost, Fly, SEPIC & Inv Cntr
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union