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| LTC3728_15 Datasheet, PDF (7/36 Pages) Linear Technology – Dual, 550kHz, 2-Phase Synchronous Step-Down Switching Regulator | |||
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC3728
Soft-Start Up (Figure 13)
Load Step (Figure 13)
VOUT
5V/DIV
VRUN/SS
5V/DIV
IL
2A/DIV
VIN = 15V
VOUT = 5V
5ms/DIV
VOUT
200mV/DIV
IL
2A/DIV
3728 G19
VIN = 15V
20μs/DIV
VOUT = 5V
VPLLFLTR = 0V
LOAD STEP = 0A to 3A
Burst Mode OPERATION
Load Step (Figure 13)
VOUT
200mV/DIV
IL
2A/DIV
3728 G20
VIN = 15V
20μs/DIV
VOUT = 5V
VPLLFLTR = 0V
LOAD STEP = 0A to 3A
CONTINUOUS OPERATION
3728 G21
Input Source/Capacitor
Instantaneous Current (Figure 13)
Burst Mode Operation (Figure 13)
Constant-Frequency (Burst
Inhibit) Operation (Figure 13)
IIN
2A/DIV
VIN
200mV/DIV
VSW1
10V/DIV
VOUT
20mV/DIV
VOUT
20mV/DIV
VSW2
10V/DIV
VIN = 15V
1μs/DIV
VOUT = 5V
VPLLFLTR = 0V
IOUT = IOUT3.3A = 2A
IL
0.5A/DIV
3728 G22
VIN = 15V
VOUT = 5V
VPLLFLTR = 0V
VFCB = OPEN
IOUT = 20mA
10μs/DIV
3728 G23
IL
0.5A/DIV
VIN = 15V
VOUT = 5V
VPLLFLTR = 0V
VFCB = 5V
IOUT = 20mA
2μs/DIV
3728 G24
Current Sense Pin Input Current
vs Temperature
35
VOUT = 5V
33
31
29
27
25
â50 â25
0 25 50 75
TEMPERATURE (°C)
100 125
3728 G26
EXTVCC Switch Resistance
vs Temperature
10
8
6
4
2
0
â50 â25
0 25 50 75
TEMPERATURE (°C)
100 125
3728 G27
Oscillator Frequency
vs Temperature
700
600
VPLLFLTR = 5V
500
400
VPLLFLTR = 1.2V
300
VPLLFLTR = 0V
200
100
0
â50 â25
0 25 50 75
TEMPERATURE (°C)
100 125
3728 G28
3728fg
7
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