LTC3727LX-1_15 Datasheet, PDF (6/28 Pages) Linear Technology – High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator

LTC3727LX-1
TYPICAL PERFOR A CE CHARACTERISTICS
SENSE Pins Total Source Current
100
50
0
–50
–100
–150
–200
–250
–300
–350
–400
0
5
10
15
V_SENSE COMMON MODE VOLTAGE (V)
3727LX1 G13
Soft-Start Up (Figure 12)
Dropout Voltage vs Output Current
(Figure 13)
1.4
V_OUT = 5V
1.2
1.0
R_SENSE = 0.015Ω
0.8
0.6
0.4
0.2
0
0
R_SENSE = 0.010Ω
1
2
3
4
5
OUTPUT CURRENT (A)
3727LX1 G14
Load Step (Figure 12)
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
3727LX1 G15
Load Step (Figure 12)
I_L
5A/DIV
V_OUT
5V/DIV
V_RUN/SS
5V/DIV
V_OUT
200mV/DIV
I_L
2A/DIV
V_OUT
200mV/DIV
I_L
2A/DIV
V_IN = 20V
V_OUT = 12V
50ms/DIV
3727LX1 G16
V_IN = 15V
50µs/DIV
V_OUT = 12V
LOAD STEP = 0A TO 3A
Burst Mode OPERATION
3727LX1 G17
V_IN = 15V
50µs/DIV
V_OUT = 12V
LOAD STEP = 0A TO 3A
CONTINUOUS MODE
3727LX1 G18
Input Source/Capacitor
Instantaneous Current (Figure 12)
Burst Mode Operation (Figure 12)
Constant Frequency (Burst Inhibit)
Operation (Figure 12)
I_IN
1A/DIV
V_SW1
20V/DIV
V_SW2
20V/DIV
V_IN = 15V
V_OUT1 = 12V
V_OUT2 = 5V
I_OUT1 = I_OUT2 = 2A
1µs/DIV
V_OUT
20mV/DIV
V_OUT
20mV/DIV
3727LX1 G19
I_L
0.5A/DIV
V_IN = 15V
V_OUT = 12V
V_FCB = OPEN
I_OUT = 20mA
50µs/DIV
3727LX1 G20
I_L
0.5A/DIV
V_IN = 15V
V_OUT = 12V
V_FCB = 7.5V
I_OUT = 20mA
5µs/DIV
3727LX1 G21
6
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