LTC3872-1_15 Datasheet, PDF (18/20 Pages) Linear Technology – No RSENSE Current Mode Boost DC/DC Controller

LTC3872-1
typical applications
High Efficiency 5V Input, 48V Output Boost Converter
RUN/SS
5V/DIV
I_L
5A/DIV
V_OUT
20V/DIV
1M
2.2nF ^63.4k
1%
V_IN
0.33µF
I_TH RUN/SS V_IN
IPRG
LTC3872-1
GND
SW
12.1k
1%
V_FB
475k
1%
NGATE
L1
10µH
V_IN
C_IN ^5V
10µF
M1
D1
C_OUT1
2.2µF
×3
C_OUT2 ⁺
68µF
V_OUT
48V
0.5A
C_OUT1: NIPPON CHEMI-CON KTS101B225M43N
D1: DIODES INC. PDS760
L1: SUMIDA CDEP147NP-100
M1: VISHAY Si7850DP
38721 TA05a
Soft-Start
Load Step
I_LOAD
200mA/DIV
I_L
2A/DIV
40ms/DIV
38721 TA05b
V_OUT
500mV/DIV
AC-COUPLED
500µs/DIV
38721 TA05c
18
100
90
80
70
60
50
40
30
20
1
Efficiency
10
100
LOAD (mA)
1000
38721 TA05d
For more information www.linear.com/LTC3872-1
38721f