Datasheet

LT3757/LT3757A
28
3757afe
For more information www.linear.com/LT3757
Typical applicaTions
3.3V Input, 5V/10A Output Boost Converter
Boost Preregulator for Automotive Stop-Start/Idle
Efficiency vs Output Current
Transient V
IN
and V
OUT
Waveforms
SENSE
LT3757
V
IN
V
IN
3.3V
C
IN
22µF
6.3V
×2
V
OUT
5V
10A
0.004Ω
1W
M1
41.2k
300kHz
GATE
FBX
GND
INTV
CC
SHDN/UVLO
SYNC
RT
SS
V
C
49.9k
34k
0.1µF
6.8k
22nF 2.2nF
22Ω
L1
0.5µH
D1
3757 TA02a
34k
1%
15.8k
1%
C
OUT1
150µF
6.3V
×4
C
OUT2
22µF
6.3V
X5R
×4
+
C
VCC
4.7µF
10V
X5R
C
IN
: TAIYO YUDEN JMK325BJ226MM
C
OUT1
: PANASONIC EEFUEOJ151R
C
OUT2
: TAIYO YUDEN JMK325BJ226MM
D1: MBRB2515L
L1: VISHAY SILICONIX IHLP-5050FD-01
M1: VISHAY SILICONIX SI4448DY
OUTPUT CURRENT (A)
EFFICIENCY (%)
3757 TA02b
0.001
20
30
40
50
60
70
80
90
100
0.01
0.1 1 10
SENSE
LT3757A
V
IN
V
IN
3V TO 36V
10µF
50V
X5R
×2
V
OUT
9V
MIN
2A
41.2k
300kHz
GATE
FBX
GND
INTV
CC
SHDN/UVLO
SYNC
RT
SS
V
C
1M
698k
0.1µF
10k
10nF 4.7µF
L1
3.3µH
D1
3757 TA03a
M1
75k
8mΩ
16.2k
C1
10µF
50V
×4
+
10µF
50V
X5R
L1: COILTRONIX DR127-3R3
M1: VISHAY SILICONIX Si7848BDP
D1: VISHAY SILICONIX 50SQ04FN
C1: KEMET T495X106K050A
10ms/DIV
V
OUT
5V/DIV
V
IN
5V/DIV
0V
3757 TA03b
OUTPUT POWER = 10W
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