LTC3861-1 Datasheet, PDF (7/36 Pages) Linear Technology – Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing

Typical Performance Characteristics
128-Cycle Overcurrent Counter
(Single Phase Using FDMF6707B
DrMOS)
PWM
2V/DIV
TRACK/SS
200mV/DIV
V_OUT
500mV/DIV
I_L
20A/DIV
V_IN = 12V
V_OUT = 1.8V
50µs/DIV
38611 G19
f_SW = 500kHz EXTERNAL CLOCK
Oscillator Frequency vs R_FREQ
2.5
2.3
2.1
1.9
1.7
1.5
1.3
1.1
0.9
0.7
0.5
0.3
0.1
0
20 40 60 80 100 120
R_FREQ (kΩ)
38611 G20
LTC3861-1
Overcurrent Threshold
vs Temperature
40
I_LIM = 1.2V
35
30
25
20
15
I_LIM = 800mV
10
5
–50
0
50
100
150
TEMPERATURE (°C)
38611 G21
I_LIM Pin Current vs Temperature
20.6
20.4
20.2
20.0
19.8
19.6
19.4
19.2
–50
0
50
100
TEMPERATURE (°C)
150
38611 G22
FREQ Pin Current vs Temperature
20.6
20.4
20.2
20.0
19.8
19.6
19.4
19.2
19.0
–50
0
50
100
TEMPERATURE (°C)
150
38611 G23
600kHz Preset Frequency
vs Temperature
620
615
610
605
600
595
590
585
580
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
38611 G24
400kHz Preset Frequency
vs Temperature
395
390
385
380
375
370
365
–50
0
50
100
TEMPERATURE (°C)
150
38611 G25
Quiescent Current vs Temperature
24
V_IN = 6V
22
V_CC = 5V
RUN1 = RUN2 = 5V
20
18
16
14
12
10
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
38611 G26
Shutdown Quiescent Current
vs Temperature
34
V_IN = 6V
V_CC = 5V
33
32
31
30
29
28
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
38611 G27
38611f
7