LTC3543_15 Datasheet, PDF (5/20 Pages) Linear Technology – 600mA Synchronous Step Down Buck Regulator with PLL, Soft-Start and Spread Spectrum

LTC3543
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
Switch Leakage (I_SW)
vs Temperature
800 _{VIN = 5.5V}
700 ^{RUN = 0V}
600
500
SYNCHRONOUS SWITCH
400
300
200
MAIN SWITCH
100
0
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
3543 G15
Dynamic Supply Current
vs Input Voltage (V_IN)
400 _{ILOAD = 0A}
V_OUT = 1.5V
300
PULSE SKIP MODE
200
100
Burst Mode OPERATION
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
3543 G16
Dynamic Supply Current
vs Temperature
400
350
300
250
200
150
100
50
0
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
3543 G17
Switch Leakage (I_SW)
vs Input Voltage (V_IN)
1000 _{RUN = 0V}
900
800
700
600
MAIN SWITCH
500
400 ^{SYNCHRONOUS SWITCH}
300
200
100
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
3543 G18
Start-Up from Shutdown
RUN
5V/DIV
V_OUT
1V/DIV
INDUCTOR
CURRENT
200mA/DIV
V_IN = 3.6V
V_OUT = 1.5V
I_LOAD = 300mA
200μs/DIV
3543 G19
Pulse Skip Operation
V_OUT
AC COUPLED
50mV/DIV
SW
5V/DIV
I_L
100mA/DIV
V_IN = 3.6V
V_OUT = 1.5V
I_LOAD = 3mA
V_MODE = 3.6V
10μs/DIV
3543 G20
Burst Mode Operation
V_OUT
AC COUPLED
50mV/DIV
SW
5V/DIV
I_L
100mA/DIV
V_IN = 3.6V
V_OUT = 1.5V
I_LOAD = 3mA
V_MODE = 0V
10μs/DIV
3543 G21
3543fa
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