Datasheet

LTC3872
17
3872fc
For more information www.linear.com/LTC3872
High Efficiency 5V Input, 12V Output Boost Converter
High Efficiency 5V Input, 24V Output Boost Converter
Typical applicaTions
I
LOAD
500mA/DIV
STEP FROM
100mA TO 600mA
I
LOAD
5A/DIV
V
OUT
500µs/DIV
3872 TA03b
LOAD (mA)
1
0
EFFICIENCY (%)
20
30
40
50
60
70
10
100
3872 TA04b
80
90
100
10
1000
I
LOAD
500mA/DIV
STEP FROM
100mA TO 600mA
I
LOAD
5A/DIV
V
OUT
500µs/DIV
3872 TA04c
Efficiency Load Step
I
TH
IPRG
GND
V
FB
V
IN
SW
NGATE
LTC3872
SBM835L
3872 TA03a
RUN/SS
11k
4.7M
11.8k
1%
107k
1%
C
OUT1
: TAIYO YUDEN TMK325B7226MM
L1: TOKO D124C 892NAS-3R3M
M1: IRF3717
C
IN
10µF
C
OUT1
22µF
×2
2.2nF
100pF
1nF
C
OUT2
68µF
L1
3.3µH
M1
V
IN
5V
V
OUT
12V
2A
+
I
TH
IPRG
GND
V
FB
V
IN
SW
NGATE
LTC3872
UPS840
3872 TA04a
RUN/SS
52.3k
4.7M
12.1k
1%
232k
1%
C
OUT1
: TAIYO YUDEN UMK325BJ106MM-T
L1: WURTH WE-HCF 8.2µH 7443550820
M1: VISHAY Si4174DY
C
IN
10µF
C
OUT1
10µF
×2
1nF
0.068µF
C
OUT2
68µF
L1
8.2µH
M1
V
IN
5V
V
OUT
24V
1A
100pF
+