Datasheet

LTC3861
6
3861fa
For more information www.linear.com/LTC3861
Typical perFormance characTerisTics
Coincident Tracking (Single
Phase Using FDMF6707B DrMOS)
Ratiometric Tracking (Single
Phase Using FDMF6707B DrMOS)
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)
128-Cycle Overcurrent Counter
(Single Phase Using FDMF6707B
DrMOS)
Start-Up Response
(2-Phase Using LTC4449)
Start-Up Transient Response
(4-Phase Using TDA21220
DrMOS)
Soft-Start Start-Up Response
(2-Phase Using D12S1R845A
Power Block)
500µs/DIV
3861 G10
V
RUN
5V/DIV
V
OUT
1V/DIV
V
IN
= 12V
V
OUT
= 1.2V
R
LOAD
= 70mΩ
f
SW
= 300kHz
I
L1
10A/DIV
I
L2
10A/DIV
INTERNAL
SOFT-START
5ms/DIV
3861 G12
V
OUT
200mV/DIV
V
IN
= 12V
V
OUT
= 1.2V
0.1µF CAPACITOR ON TRACK/SS1
f
SW
= 400kHz
2ms/DIV
3861 G13
V
IN
= 12V
V
OUT
= 1.8V
f
SW
= 500kHz EXTERNAL CLOCK
3.3V TRACKING
SIGNAL
V
OUT
500mV/DIV
2ms/DIV
3861 G14
V
IN
= 12V
V
OUT
= 1.8V
f
SW
= 500kHz EXTERNAL CLOCK
3.3V TRACKING
SIGNAL
V
OUT
500mV/DIV
200µs/DIV
3861 G15
V
OUT
500mV/DIV
V
IN
= 12V
V
OUT
= 1.8V
f
SW
= 500kHz EXTERNAL CLOCK
PWM
2V/DIV
I
L
10A/DIV
5µs/DIV
3861 G16
V
OUT
500mV/DIV
V
IN
= 12V
V
OUT
= 1.8V
300mV PREBIASED OUTPUT
f
SW
= 500kHz EXTERNAL CLOCK
PWM
2V/DIV
I
L
10A/DIV
10ms/DIV
3861 G17
V
OUT
500mV/DIV
V
IN
= 12V
V
OUT
= 1.8V
f
SW
= 500kHz EXTERNAL CLOCK
PWM
2V/DIV
TRACK/SS
500mV/DIV
I
L
20A/DIV
50µs/DIV
3861 G18
V
OUT
500mV/DIV
V
IN
= 12V
V
OUT
= 1.8V
f
SW
= 500kHz EXTERNAL CLOCK
PWM
2V/DIV
TRACK/SS
200mV/DIV
I
L
20A/DIV
500µs/DIV
3861 G11
V
OUT
500mV/DIV
V
IN
= 12V
V
OUT
= 1V
R
LOAD
= 0.016Ω
f
SW
= 500kHz EXTERNAL CLOCK
I
LOAD
50A/DIV
RUN
5V/DIV
INTERNAL
SOFT-START