LTC3872-1_15 Datasheet, PDF (17/20 Pages) Linear Technology – No RSENSE Current Mode Boost DC/DC Controller

typical applications
High Efficiency 5V Input, 12V Output Boost Converter
2.2nF
11k
100pF
11.8k
1%
4.7M
1nF
I_TH RUN/SS V_IN
IPRG
LTC3872-1
GND
SW
V_FB
NGATE
107k
1%
L1
3.3µH
V_IN
C_IN ^5V
10µF
M1
SBM835L
C_OUT1
22µF
×2
C_OUT2
68µF
I_LOAD
500mA/DIV
STEP FROM
100mA TO 600mA
I_L
5A/DIV
V_OUT
12V
2A
V_OUT
500mV/DIV
AC-COUPLED
C_OUT1: TAIYO YUDEN TMK325B7226MM
L1: TOKO D124C 892NAS-3R3M
M1: IRF3717
38721 TA03a
LTC3872-1
500µs/DIV
38721 TA03b
100
90
80
70
60
50
40
30
20
10
0
1
High Efficiency 5V Input, 24V Output Boost Converter
4.7M
1nF
52.3k
100pF
12.1k
1%
0.068µF
I_TH RUN/SS V_IN
IPRG
LTC3872-1
GND
SW
V_FB
NGATE
232k
1%
L1
8.2µH
V_IN
C_IN ^5V
10µF
M1
UPS840
C_OUT1
10µF
×2
C_OUT2
68µF
V_OUT
24V
1A
C_OUT1: TAIYO YUDEN UMK325BJ106MM-T
L1: WURTH WE-HCF 8.2µH 7443550820
M1: VISHAY Si4174DY
38721 TA04a
Efficiency
Load Step
I_LOAD
500mA/DIV
STEP FROM
100mA TO 600mA
I_L
5A/DIV
10
100
LOAD (mA)
1000
38721 TA04b
V_OUT
500mV/DIV
AC-COUPLED
500µs/DIV
For more information www.linear.com/LTC3872-1
38721 TA04c
38721f
17