LTC3728 Datasheet, PDF (6/32 Pages) Linear Technology – Dual, 550kHz, 2-Phase Synchronous Step-Down Switching Regulator

LTC3728
TYPICAL PERFOR A CE CHARACTERISTICS
Load Regulation
0.0
–0.1
FCB = 0V
V_IN = 15V
–0.2
–0.3
–0.4
0
1
2
3
4
5
LOAD CURRENT (A)
3728 G13
Maximum Current Sense
Threshold vs Temperature
80
78
76
74
72
70
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3728 G17
Soft-Start Up (Figure 13)
V_ITH vs V_RUN/SS
2.5
V_OSENSE = 0.7V
2.0
1.5
1.0
0.5
0
0
1
2
3
4
V_RUN/SS (V)
56
3728 G14
Dropout Voltage vs Output Current
(Figure 14)
4
V_OUT = 5V
3
2
R_SENSE = 0.015Ω
1
R_SENSE = 0.010Ω
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT CURRENT (A)
3728 G18
Load Step (Figure 13)
SENSE Pins Total Source Current
100
50
0
–50
–100
0
2
4
6
V_SENSE COMMON MODE VOLTAGE (V)
3728 G15
RUN/SS Current vs Temperature
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3728 G25
Load Step (Figure 13)
V_OUT
5V/DIV
V_RUN/SS
5V/DIV
I_L
2A/DIV
V_OUT
200mV/DIV
I_L
2A/DIV
V_OUT
200mV/DIV
I_L
2A/DIV
V_IN = 15V
V_OUT = 5V
5ms/DIV
3728 G19
V_IN = 15V
20µs/DIV
V_OUT = 5V
V_PLLFLTR = 0V
LOAD STEP = 0A TO 3A
Burst Mode OPERATION
3728 G20
V_IN = 15V
20µs/DIV
V_OUT = 5V
V_PLLFLTR = 0V
LOAD STEP = 0A TO 3A
CONTINUOUS MODE
3728 G21
3728fb
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