LTC3542-1_15 Datasheet, PDF (4/16 Pages) Linear Technology – 500mA, 2.25MHz 2.8V Output Synchronous Step-Down DC/DC Converter

LTC3542-1
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise specified.
Burst Mode Operation
Pulse-Skip Mode Operation
Start-Up from Shutdown
SW
2V/DIV
V_OUT
50mV/DIV
AC COUPLED
I_L
100mA/DIV
V_IN = 3.6V
2μs/DIV
I_LOAD = 25mA
FIGURE 3a CIRCUIT
SW
2V/DIV
V_OUT
50mV/DIV
AC COUPLED
I_L
100mA/DIV
35421 G01
V_IN = 4.2V
I_LOAD = 0A
400ns/DIV
RUN
2V/DIV
V_OUT
1V/DIV
I_L
200mA/DIV
35421 G02
V_IN = 3.6V
400μs/DIV
I_LOAD = 0A
FIGURE 3a CIRCUIT
35421 G03
Start-Up from Shutdown
RUN
2V/DIV
V_OUT
1V/DIV
I_L
200mA/DIV
V_IN = 3.6V
400μs/DIV
I_LOAD = 500mA
FIGURE 3a CIRCUIT
Load Step
V_OUT
100mV/DIV
AC COUPLED
I_L
500mA/DIV
I_LOAD
500mA/DIV
35421 G04
V_IN = 3.6V
20μs/DIV
I_LOAD = 30mA TO 500mA
FIGURE 3a CIRCUIT
Load Step
V_OUT
100mV/DIV
AC COUPLED
I_L
500mA/DIV
I_LOAD
500mA/DIV
35421 G05
V_IN = 3.6V
20μs/DIV
I_LOAD = 0mA TO 500mA
FIGURE 3a CIRCUIT
35421 G06
Reference Voltage
vs Temperature
2.85
V_IN = 3.6V
PULSE-SKIP MODE
2.83 ^{NO LOAD}
2.81
2.79
2.77
2.75
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
LTC1520 G01
Oscillator Frequency
vs Temperature
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
–50 –30 –10 10 30 50 70 90 110
TEMPERATURE (°C)
35421 G08
Oscillator Frequency
vs Supply Voltage
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
2
3
4
5
SUPPLY VOLTAGE (V)
6
35421 G09
35421f
4