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LTC3543 Datasheet, PDF (5/16 Pages) Linear Technology – 600mA Synchronous Step Down Buck Regulator with PLL, Soft-Start and Spread Spectrum
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LTC3543
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted.
Startup from Shutdown
RUN
5V/DIV
VOUT
1V/DIV
INDUCTOR
CURRENT
200mA/DIV
VIN = 3.6V
VOUT = 1.5V
ILOAD = 300mA
200µs/DIV
Pulse Skip Operation
VOUT
AC COUPLED
50mV/DIV
SW
5V/DIV
IL
100mA/DIV
3543 G19
VIN = 3.6V
VOUT = 1.5V
ILOAD = 3mA
VMODE = 3.6V
10µs/DIV
Burst Mode Operation
VOUT
AC COUPLED
50mV/DIV
SW
5V/DIV
IL
100mA/DIV
3543 G20
VIN = 3.6V
VOUT = 1.5V
ILOAD = 3mA
VMODE = 0V
10µs/DIV
3543 G21
Load Step
VOUT
AC COUPLED
100mV/DIV
IL
200mA/DIV
ILOAD
200mA/DIV
VIN = 3.6V
20µs/DIV
VOUT = 1.5V
ILOAD = 3mA TO 200mA
VMODE = 0V
Load Step
VOUT
AC COUPLED
200mV/DIV
IL
200mA/DIV
ILOAD
200mA/DIV
3543 G22
VIN = 3.6V
20µs/DIV
VOUT = 1.5V
ILOAD = 3mA TO 200mA
VMODE = 3.6V
Load Step
VOUT
AC COUPLED
100mV/DIV
IL
200mA/DIV
ILOAD
200mA/DIV
3543 G24
VIN = 3.6V
10µs/DIV
VOUT = 1.5V
ILOAD = 100mA TO 600mA
VMODE = 3.6V
3543 G23
Spread Spectrum Load Step
PLL Operation
VOUT
AC COUPLED
100mV/DIV
IL
200mA/DIV
VC1
200mV/DIV
ILOAD
200mA/DIV
VIN = 3.6V
10µs/DIV
VOUT = 1.5V
ILOAD = 100mA TO 200mA
VMODE = 0.6V
3543 G25
C1 = 4µF
100µs/DIV
3MHz TO 1MHz STEP
PLL Operation at 3MHz
VMODE
2V/DIV
SW
2V/DIV
3543 G26
100ns/DIV
3543 G27
3543f
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