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LTC3727 Datasheet(PDF) 6 Page - Linear Technology

Part No. LTC3727
Description  High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
Logo LINER - Linear Technology

LTC3727 Datasheet(HTML) 6 Page - Linear Technology

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LTC3727/LTC3727-1
3727f
Soft-Start Up (Figure 13)
IOUT
5A/DIV
VOUT
5V/DIV
VRUN/SS
5V/DIV
VIN = 20V
50ms/DIV
3727 G16
VOUT = 12V
Load Step (Figure 13)
VOUT
200mV/DIV
IOUT
2A/DIV
VIN = 15V
50
µs/DIV
3727 G17
VOUT = 12V
LOAD STEP = 0A TO 3A
Burst Mode OPERATION
Load Step (Figure 13)
VOUT
200mV/DIV
IOUT
2A/DIV
VIN = 15V
50
µs/DIV
3727 G18
VOUT = 12V
LOAD STEP = 0A TO 3A
CONTINUOUS MODE
Input Source/Capacitor
Instantaneous Current (Figure 13)
VSW1
20V/DIV
VIN = 15V
1
µs/DIV
3727 G19
VOUT1 = 12V
VOUT2 = 5V
IOUT1 = IOUT2 = 2A
Burst Mode Operation (Figure 13)
VOUT
20mV/DIV
IOUT
0.5A/DIV
VIN = 15V
50
µs/DIV
3727 G20
VOUT = 12V
VFCB = OPEN
IOUT = 20mA
Constant Frequency (Burst Inhibit)
Operation (Figure 13)
VOUT
20mV/DIV
IOUT
0.5A/DIV
VIN = 15V
5
µs/DIV
3727 G21
VOUT = 12V
VFCB = 7.5V
IOUT = 20mA
VSW2
20V/DIV
TYPICAL PERFOR A CE CHARACTERISTICS
IIN
1A/DIV
SENSE Pins Total Source Current
VSENSE COMMON MODE VOLTAGE (V)
0
–400
–300
–250
–200
–150
–100
–50
5
10
3727 G13
0
50
100
–350
15
Dropout Voltage vs Output Current
(Figure 13)
RUN/SS Current vs Temperature
OUTPUT CURRENT (A)
0
1.0
1.2
1.4
4
3727 G14
0.8
0.6
123
5
0.4
0.2
0
VOUT = 5V
RSENSE = 0.015Ω
RSENSE = 0.010Ω
TEMPERATURE (
°C)
–50
–25
0
0.2
0.6
0.8
1.0
75
100
50
1.8
3727 G15
0.4
0
25
125
1.2
1.4
1.6


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