LTC3708_15 Datasheet, PDF (5/32 Pages) Linear Technology – Fast 2-Phase, No RSENSE Buck Controller with Output Tracking

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3708
Soft-Start
V_OUT1
2V/DIV
V_OUT2
2V/DIV
RUN/SS
5V/DIV
I_L1
5A/DIV
Power Loss vs Input Voltage
6
I_OUT = 15A
5
V_OUT = 2.5V
4
3
V_OUT = 1.8V
2
50ms/DIV
Power Loss vs Load Current
3.5
V_IN = 5V
3.0
V_OUT = 2.5V
2.5
V_OUT = 1.8V
2.0
1.5
1.0
0.5
0
10
100
1000 10000 100000
LOAD (mA)
3707 G07
On-Time vs I_ON Current
10000
1000
100
10
1
10
100
I_ON CURRENT (μA)
1000
3708 G10
3708 G05
1
0
5
Frequency vs Input Voltage
260
240
I_OUT = 15A
10
15
20
INPUT VOLTAGE (V)
25
3708 G06
Frequency vs Load Current
250
200
220
EXTERNAL SYNCHRONIZATION (ANY I_OUT)
200
I_OUT = 0A
180
160
5
10
15
20
INPUT VOLTAGE (V)
25
3708 G08
On-Time vs Temperature
300
I_ON = 30μA
250
200
150
I_ON = 60μA
100
50
0
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3708 G11
150
100
FORCED CONTINUOUS MODE
50
EXTERNAL
SYNCHRONIZATION
DISCONTINUOUS MODE
0
0
5
10
15
LOAD CURRENT (A)
3708 G09
Current Sense Threshold
vs I_TH Voltage
300
V_RNG =
2V
250
1.4V
200
1V
150
0.7V
100
50
0.5V
0
–50
–100
–150
–200
0
0.5
1
1.5
I_TH VOLTAGE (V)
2
2.5
3708 G12
3708fb
5