LTC3860_15 Datasheet, PDF (5/36 Pages) Linear Technology – Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Current Sharing

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3860
Load Step Transient Response
(Single Phase)
I_LOAD
10A/DIV
I_L
10A/DIV
V_OUT
50mV/DIV
V_IN = 12V
50μs/DIV
V_OUT = 1.2V
I_LOAD STEP = 10A
COMP VALUES:
3860 G01
R2A = 6.8kΩ, C1A = 470pF, C2A = 100pF
Load Step Transient Response
(2-Phase)
I_LOAD
10A/DIV
I_L1
5A/DIV
I_L2
5A/DIV
V_OUT
50mV/DIV
V_IN = 12V
50μs/DIV
V_OUT = 1.8V
I_LOAD STEP = 10A
3860 G02
Load Step Transient Response
(2-Phase)
I_LOAD
10A/DIV
I_L1
5A/DIV
I_L2
5A/DIV
V_OUT
50mV/DIV
V_IN = 12V
50μs/DIV
V_OUT = 1.2V
I_LOAD STEP = 10A
3860 G03
Load Step Transient Response
(2-Phase with 50% Inductor
Mismatch)
V_OUT(AC)
100mV/DIV
I_LOAD
20A/DIV
I_L1 = 320nH
10A/DIV
I_L2 = 220nH
10A/DIV
V_IN = 12V
50μs/DIV
V_OUT = 1.2V
I_LOAD = 0A TO 25A
3860 G04
Efficiency and Power Loss
vs Load Current
100
7
V_IN = 6V
90 _{VOUT = 1.2V}
6
80
70
5
60
4
50
40
3
30
2
20
1
10
0
0.001
0.01 0.1
1
0
10 100
LOAD CURRENT (A)
3860 G05
Efficiency and Power Loss
vs Supply Voltage
90
6.0
V_OUT = 1.2V
88
I_OUT = 15A ^5.5
86
5.0
84
4.5
82
4.0
80
3.5
78
3.0
76
2.5
74
2.0
72
1.5
70
1.0
6 7 8 9 10 11 12 13 14
SUPPLY VOLTAGE (V)
3860 G06
3860fc
5