LTC3728 Linear Technology, LTC3728 Datasheet - Page 6

• Manufacturer Part Number: LTC3728
• Description: 2-Phase Synchronous Step-Down Switching Regulator
• Manufacturer: Linear Technology

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