LTC3862 Datasheet, PDF (36/40 Pages) Linear Technology – Multi-Phase Current Mode Step-Up DC/DC Controller

LTC3862
TYPICAL APPLICATIONS
A 12V Input, 24V/5A Output 2-Phase Boost Converter Application Circuit
45.3k
10nF
1nF
26.7k
100pF
6.98k
130k
V_OUT
D_MAX
SLOPE
3V8
SENSE1⁺
BLANK
PHASEMODE SENSE1^–
FREQ
RUN
SS
LTC3862 ^VIN
ITH
FB
SGND
INTV_CC
GATE1
PGND
CLKOUT
SYNC
PLLFLTR
GATE2
SENSE2^–
SENSE2⁺
V_IN
5V TO 24V
L1
4.2μH
CDEP145-4R2
1nF
10Ω
10nF
15k
100k
1μF
4.7μF
22μF 25V
22μF 25V
22μF 25V
10Ω
10nF
L2
4.2μH
CDEP145-4R2
D1
MBRD835L
Q1
Si7386DP
0.007Ω
1W
100μF
35V
100μF _{10μF 50V}
35V
0.007Ω
1W
Q2
Si7386DP
D2
MBRD835L
10μF 50V
10μF 50V
10μF 50V
V_OUT
24V
5A (MAX)
3862 TA02a
RUN
5V/DIV
I_L1
5A/DIV
I_L2
5A/DIV
V_OUT
20V/DIV
V_IN = 12V
V_OUT = 24V
I_LOAD = 5A
Start-Up
1ms/DIV
36
3862 TA02b
Load Step
I_LOAD
5A/DIV
I_L1
5A/DIV
I_L2
5A/DIV
V_OUT
500mV/DIV
V_IN = 12V
V_OUT = 24V
I_LOAD = 2A TO 5A
500μs/DIV
Efficiency
100
V_IN = 12V
V_OUT = 24V
95
EFFICIENCY
90
POWER LOSS
85
10000
1000
80
75
100
1000
LOAD CURRENT (mA)
100
10000
3862 TA02d
3862 TA02c
3862fb