LTC3727-1 Linear Technology, LTC3727-1 Datasheet - Page 6

• Manufacturer Part Number: LTC3727-1
• Description: 2-Phase Synchronous Step-Down Switching Regulators
• Manufacturer: Linear Technology

LTC3727/LTC3727-1
TYPICAL PERFOR A CE CHARACTERISTICS
6
20V/DIV
20V/DIV
V
5A/DIV
5V/DIV
5V/DIV
1A/DIV
RUN/SS
–200
–400
–100
–150
–250
–300
–350
V
V
V
I
–50
100
SW1
SW2
OUT
OUT
50
I
IN
0
0
V
V
SENSE Pins Total Source Current
Soft-Start Up (Figure 13)
Input Source/Capacitor
Instantaneous Current (Figure 13)
V
V
V
I
OUT1
IN
OUT
IN
OUT1
OUT2
= 20V
= 15V
V
= 12V
= I
SENSE
= 12V
= 5V
OUT2
COMMON MODE VOLTAGE (V)
= 2A
5
50ms/DIV
1 s/DIV
10
W
3727 G13
3727 G16
3727 G19
U
15
200mV/DIV
20mV/DIV
0.5A/DIV
2A/DIV
1.4
V
1.2
1.0
0.8
0.6
0.4
0.2
V
I
I
OUT
OUT
OUT
OUT
0
0
Dropout Voltage vs Output Current
(Figure 13)
V
Load Step (Figure 13)
V
V
LOAD STEP = 0A TO 3A
Burst Mode OPERATION
Burst Mode Operation (Figure 13)
V
V
V
I
OUT
OUT
IN
OUT
IN
OUT
FCB
= 15V
= 15V
= 20mA
= 12V
= OPEN
= 5V
= 12V
1
OUTPUT CURRENT (A)
2
50 s/DIV
50 s/DIV
R
R
SENSE
SENSE
3
= 0.015
= 0.010
4
3727 G14
3727 G17
3727 G20
5
200mV/DIV
20mV/DIV
0.5A/DIV
2A/DIV
1.0
0.8
0.4
1.8
1.6
1.4
1.2
0.6
0.2
V
V
I
I
0
OUT
OUT
OUT
OUT
–50
RUN/SS Current vs Temperature
Load Step (Figure 13)
V
V
LOAD STEP = 0A TO 3A
CONTINUOUS MODE
Constant Frequency (Burst Inhibit)
Operation (Figure 13)
V
V
V
I
OUT
IN
OUT
IN
OUT
FCB
–25
= 15V
= 15V
= 20mA
= 7.5V
= 12V
= 12V
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0
TEMPERATURE ( C)
25
50 s/DIV
5 s/DIV
50
75
100
3727 G15
3727 G18
3727 G21
3727f
125