LTC3728_15 Datasheet, PDF (6/36 Pages) Linear Technology – Dual, 550kHz, 2-Phase Synchronous Step-Down Switching Regulator

LTC3728
TYPICAL PERFORMANCE CHARACTERISTICS
Maximum Current Sense Threshold
vs V_RUN/SS (Soft-Start)
80
V_SENSE(CM) = 1.6V
60
40
20
0
01
2
3
4
5
6
V_RUN/SS (V)
3728 G10
Maximum Current Sense Threshold
vs Sense Common Mode Voltage
80
76
72
68
64
60
0
1
2
3
4
5
COMMON MODE VOLTAGE (V)
3728 G11
Current Sense Threshold
vs I_TH Voltage
90
80
70
60
50
40
30
20
10
0
–10
–20
–30
0
0.5
1
1.5
2
2.5
V_ITH (V)
3728 G12
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
6
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
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
3728fg