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LTC3861-1 Datasheet, PDF (6/36 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
Regulated VFB vs Supply Voltage
604
602
600
598
596
3
4
5
SUPPLY VOLTAGE (V)
6
38611 G10
Soft-Start Start-Up Response
(2-Phase Using D12S1R845A
Power Block)
Start-Up Response
(2-Phase Using LTC4449)
VRUN
5V/DIV
IL1
10A/DIV
IL2
10A/DIV
VOUT
1V/DIV
VIN = 12V
VOUT = 1.2V
INTERNAL
SOFT-START
500µs/DIV
RLOAD 50mΩ
38611 G11
Start-Up Response (3-Phase
Using FDMF6707B DrMOS)
IL1
10A/DIV
IL2
10A/DIV
IL3
10A/DIV
VOUT
500mV/DIV
VIN = 12V
VOUT = 1V
INTERNAL
SOFT-START
500µs/DIV
RLOAD = 30mΩ
fSW = 500kHz
38611 G12
Coincident Tracking (Single
Phase Using FDMF6707B DrMOS)
Ratiometric Tracking (Single
Phase Using FDMF6707B DrMOS)
3.3V TRACKING
SIGNAL
VOUT
500mV/DIV
3.3V TRACKING
SIGNAL
VOUT
500mV/DIV
VOUT
200mV/DIV
VIN = 12V
VOUT = 1.2V
5ms/DIV
38611 G13
0.1µF CAPACITOR ON TRACK/SS1
fSW = 400kHz
VIN = 12V
VOUT = 1.8V
2ms/DIV
38611 G14
fSW = 500kHz EXTERNAL CLOCK
VIN = 12V
VOUT = 1.8V
2ms/DIV
38611 G15
fSW = 500kHz EXTERNAL CLOCK
Start-Up Response Into a 300mV
Prebiased Output (Single Phase
Using FDMF6707B DrMOS)
Initial 7-Cycle Nonsynchronous
Start-Up (Single Phase Using
FDMF6707B DrMOS)
Start-Up Into a Short (Single
Phase Using FDMF6707B DrMOS)
IL
10A/DIV
PWM
2V/DIV
VOUT
500mV/DIV
IL
10A/DIV
PWM
2V/DIV
VOUT
500mV/DIV
PWM
2V/DIV
VOUT
500mV/DIV
TRACK/SS
500mV/DIV
IL
20A/DIV
VIN = 12V
VOUT = 1.8V
200µs/DIV
38611 G16
fSW = 500kHz EXTERNAL CLOCK
VIN = 12V
VOUT = 1.8V
5µs/DIV
38611 G17
300mV PREBIASED OUTPUT
fSW = 500kHz EXTERNAL CLOCK
VIN = 12V
VOUT = 1.8V
10ms/DIV
38611 G18
fSW = 500kHz EXTERNAL CLOCK
38611f
6
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