LTC3861-1 Datasheet, PDF (34/36 Pages) Linear Technology – Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing

LTC3861-1
Typical Applications
Dual-Output Converter: Triple Phase + Single Phase with DrMOS,
Synchronized to an External 500kHz Clock
SS1
V_IN
7V TO 14V
3.3nF _280Ω
V_CC
5V
3.48k
C_IN1 0.1µF
180µF
1µF
3.3nF
20k
150pF
30.1k
V_OUT1
FB1
COMP1
VSNSP
VSNSN
100pF
V_IN
V_CC
100k
RUN1
V_CC
C_IN2
22µF × 2
16V ^10k
RUN1
ILIM1
SGND
ISNS1P
53.6k
1Ω
2.2µF
16V
2.2µF
16V
V_CC
CLKIN
500kHz EXTERNAL
SYNC INPUT
VSNSOUT
COMP2
FB2
LTC3861-1
ISNS1N
ISNS2N
ISNS2P
SGND
ILIM2
RUN2
V_CC V_IN
SS1
34k
RUN1
V_CC
C_IN3
22µF × 2
16V ^10k
1Ω
2.2µF
16V
2.2µF
16V
0.22µF
BOOT
PHASE
V_IN ^FDMF6707B
DISB
VSWH
PWM
VDRV
PGND
VCIN SMOD CGND
10k
0.22µF
BOOT
PHASE
V_IN ^FDMF6707B
DISB
VSWH
PWM
VDRV
PGND
VCIN SMOD CGND
10k
V_CC
5V
10k ^100pF
280Ω 2.1k
3.3nF
4.99k
1µF
V_OUT2
1.5nF
V_IN
V_CC
SS1
V_IN
RUN1
V_CC
C_IN4
22µF × 2
16V ^10k
FB1
COMP1
VSNSP
VSNSN
VSNSOUT
COMP2
FB2
LTC3861-1
RUN1
ILIM1
SGND
53.6k
1Ω
2.2µF
16V
2.2µF
16V
ISNS1P
ISNS1N
ISNS2N
ISNS2P
SGND
ILIM2
RUN2
V_IN
53.6k
RUN2
C_IN5
22µF × 2
16V ^10k
0.1µF ^{34k 100k V}CC
V_CC
1Ω
2.2µF
16V
2.2µF
16V
0.22µF
BOOT
PHASE
V_IN ^FDMF6707B
DISB
VSWH
PWM
VDRV
PGND
VCIN SMOD CGND
10k
0.22µF
BOOT
PHASE
V_IN ^FDMF6707B
DISB
VSWH
PWM
VDRV
PGND
VCIN SMOD CGND
10k
C_OUT2, C_OUT4 : SANYO 2R5TPE330M9
C_OUT1, C_OUT3 : MURATA GRM32ER60J107ME20
L1, L2, L3, L4 : WÜRTH ELEKTRONIK 744355147
38611 TA05
L1
0.47µH
2.87k
0.22µF
0.22µF
2.87k
L2
0.47µH
L3
0.47µH
2.87k
0.22µF
0.22µF
2.87k
L4
0.47µH
V_OUT1
1V/ 75A
C_OUT1
100µF × 6
6.3V
C_OUT2
330µF
×6
2.5V
V_OUT2
1.8V/ 25A
C_OUT3
100µF × 2
6.3V
C_OUT4
330µF
×3
2.5V
38611f
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