LTC3862 Datasheet, PDF (37/40 Pages) Linear Technology – Multi-Phase Current Mode Step-Up DC/DC Controller

LTC3862
TYPICAL APPLICATIONS
A 4.5V to 5.5V Input, 12V/15A Output 4-Phase Boost Converter Application Circuit
45.3k
10nF
10nF
3.83k
330pF
18.7k
V_OUT
165k
D_MAX
SLOPE
3V8
SENSE1⁺
BLANK
PHASEMODE SENSE1^–
FREQ
RUN
SS
LTC3862 ^VIN
ITH
FB
SGND
INTV_CC
GATE1
PGND
GATE2
CLKOUT
SYNC
PLLFLTR
SENSE2^–
SENSE2⁺
V_IN
4.5V TO 5.5V
L1
2.7μH
CDEP145-2R7
1nF
10Ω
10nF
ON/OFF
CONTROL
D1
MBRB2515LT41
Q1
HAT2165H
0.005Ω
1W
220μF
16V
1μF
4.7μF
10nF
33μF 10V
33μF 10V
33μF 10V
10Ω
L2
2.7μH
CDEP145-2R7
220μF 15μF 25V
16V
0.005Ω
1W
Q3
HAT2165H
15μF 25V
15μF 25V
15μF 25V
D2
MBRB2515LT41
V_OUT
12V
15A
45.3k
330pF
10nF
10k
D_MAX
SLOPE
3V8
SENSE1⁺
BLANK
PHASEMODE SENSE1^–
FREQ
RUN
SS
LTC3862 ^VIN
ITH
FB
SGND
INTV_CC
GATE1
PGND
GATE2
CLKOUT
SYNC
PLLFLTR
SENSE2^–
SENSE2⁺
1nF
10nF
1μF
4.7μF
10nF
L1
2.7μH
CDEP145-2R7
D1
MBRB2515LT41
Q1
10Ω
HAT2165H
0.005Ω
1W
220μF
16V
33μF 10V
33μF 10V
33μF 10V
10Ω
L2
2.7μH
CDEP145-2R7
220μF 15μF 25V
16V
0.005Ω
1W
Q3
HAT2165H
15μF 25V
15μF 25V
15μF 25V
D2
MBRB2515LT41
3862 TA03a
Start-Up
V_IN
5V/DIV
I_L1 MASTER
5A/DIV
I_L2 MASTER
5A/DIV
I_L1 SLAVE
5A/DIV
I_L2 SLAVE
5A/DIV
V_OUT
10V/DIV
V_IN = 5V
V_OUT = 12V
R_LOAD = 10Ω
1ms/DIV
3862 TA03b
Load Step
I_LOAD
2.5A-5A
5A DIV
I_L1 MASTER
5A/DIV
I_L2 MASTER
5A/DIV
I_L1 SLAVE
5A/DIV
I_L2 SLAVE
5A/DIV
V_OUT
200mV/DIV
V_IN = 5V
V_OUT = 12V
250μs/DIV
3862 TA03c
Efficiency
100
V_IN = 5V
95 ^VOUT ^{= 12V}
100000
90
EFFICIENCY
85
10000
80
POWER LOSS
75
1000
70
65
60
100
1000
10000
LOAD CURRENT (mA)
100
100000
3862 TA03d
3862fb
37