Datasheet

LTC3708
5
3708fb
TYPICAL PERFORMANCE CHARACTERISTICS
Soft-Start Power Loss vs Input Voltage
Power Loss vs Load Current Frequency vs Input Voltage Frequency vs Load Current
On-Time vs I
ON
Current On-Time vs Temperature
Current Sense Threshold
vs I
TH
Voltage
V
OUT1
2V/DIV
V
OUT2
2V/DIV
RUN/SS
5V/DIV
I
L1
5A/DIV
50ms/DIV
3708 G05
INPUT VOLTAGE (V)
5
0
POWER LOSS (W)
1
2
3
4
5
6
10 15 20 25
3708 G06
V
OUT
= 2.5V
I
OUT
= 15A
V
OUT
= 1.8V
LOAD (mA)
10
2.0
2.5
3.5
10000
3707 G07
1.5
1.0
100 1000 100000
0.5
0
3.0
POWER LOSS (W)
V
IN
= 5V
V
OUT
= 2.5V
V
OUT
= 1.8V
INPUT VOLTAGE (V)
5
FREQUENCY (kHz)
200
220
25
3708 G08
180
160
10
15
20
260
240
I
OUT
= 15A
I
OUT
= 0A
EXTERNAL SYNCHRONIZATION (ANY I
OUT
)
LOAD CURRENT (A)
0
FREQUENCY (kHz)
100
150
3708 G09
50
0
5
10
15
250
200
FORCED CONTINUOUS MODE
EXTERNAL
SYNCHRONIZATION
DISCONTINUOUS MODE
I
ON
CURRENT (μA)
1
10
ON-TIME (ns)
100
1000
10000
10 100 1000
3708 G10
TEMPERATURE (°C)
–50
0
ON-TIME (ns)
50
100
150
200
050
100
150
3708 G11
250
300
–25 25
75
125
I
ON
= 30μA
I
ON
= 60μA
I
TH
VOLTAGE (V)
0
CURRENT SENSE THRESHOLD (mV)
100
200
300
2
3708 G12
0
–100
50
150
250
V
RNG
= 2V
1.4V
1V
0.7V
–50
–150
–200
0.5
1
1.5
2.5
0.5V