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| LTC3861-1 Datasheet, PDF (5/36 Pages) Linear Technology – Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing | |||
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LTC3861-1
Typical Performance Characteristics
Load Step Transient Response
(Single Phase Using LTC4449)
Load Step Transient Response
(2-Phase Using LTC4449)
Load Step Transient Response
(2-Phase Using D12S1R845A
Power Block)
IL
10A/DIV
ILOAD
20A/DIV
IL1
10A/DIV
ILOAD
20A/DIV
VOUT
50mV/DIV
AC-COUPLED
VIN = 12V
VOUT = 1.2V
IL2
10A/DIV
VOUT
50mV/DIV
AC-COUPLED
20µs/DIV
38611 G01
ILOAD STEP = 3A TO 18A TO 3A
fSW = 300kHz
VIN = 12V
VOUT = 1.2V
VOUT
50mV/DIV
AC-COUPLED
40µs/DIV
38611 G02
ILOAD STEP = 0A TO 20A TO 0A
fSW = 300kHz
VIN = 12V
VOUT = 1.2V
50µs/DIV
38611 G03
ILOAD STEP = 4A TO 20A TO 4A
fSW = 400kHz
Load Step Transient Response
(3-Phase Using FDMF6707B
DrMOS)
Load Step Transient Response
(4-Phase Using TDA21220
DrMOS)
Line Step Transient Response
(2-Phase Using LTC4449)
IL1
10A/DIV
IL2
10A/DIV
IL3
10A/DIV
VOUT
100mV/DIV
AC-COUPLED
VIN = 12V
VOUT = 1.2V
ILOAD
40A/DIV
VOUT
50mV/DIV
AC-COUPLED
50µs/DIV
38611 G04
ILOAD STEP = 0A TO 30A TO 0A
fSW = 500kHz EXTERNAL CLOCK
VIN = 12V
VOUT = 1V
VIN
10V/DIV
IL1
10A/DIV
IL2
10A/DIV
VOUT
50mV/DIV
AC-COUPLED
40µs/DIV
38611 G05
ILOAD STEP = 40A TO 80A TO 40A
fSW = 500kHz EXTERNAL CLOCK
20µs/DIV
38611 G06
VIN = 7V TO 14V IN 20µs ILOAD = 20A
VOUT = 1.2V
fSW = 300kHz
Efficiency vs Load Current
100
95
90
85
80
75
70
65
60
VIN = 12V
VOUT = 1.2V
55
2-PHASE, LTC4449
50
fSW = 300kHz
0 10 20 30 40 50 60 70
LOAD CURRENT (A)
38611 G07
Efficiency vs Load Current
96
94
92
90
88
86
84
82
80
78
76
74
VIN = 12V, VOUT = 1V
4-PHASE TDA21220 DrMOS
72
fSW = 500kHz EXTERNAL CLOCK
70
0 10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (A)
38611 G08
Feedback Voltage VFB
vs Temperature
601.00
600.75
600.50
600.25
600.00
599.75
599.50
â50 â25
0 25 50 75 100 125 150
TEMPERATURE (°C)
38611 G09
38611f
5
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