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

LTC3542
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise specified.
Start-Up from Shutdown
RUN
2V/DIV
V_OUT
1V/DIV
I_L
500mA/DIV
V_IN = 3.6V
400μs/DIV
V_OUT = 1.8V
I_LOAD = 500mA
FIGURE 3a CIRCUIT
Load Step
V_OUT
100mV/DIV
AC COUPLED
I_L
500mA/DIV
I_LOAD
500mA/DIV
3542 G04
V_IN = 3.6V
20μs/DIV
V_OUT = 1.8V
I_LOAD = 30mA TO 500mA
FIGURE 3a CIRCUIT
Load Step
V_OUT
100mV/DIV
AC COUPLED
I_L
500mA/DIV
I_LOAD
500mA/DIV
3542 G05
V_IN = 3.6V
20μs/DIV
V_OUT = 1.8V
I_LOAD = 0mA TO 500mA
FIGURE 3a CIRCUIT
3542 G06
Reference Voltage
vs Temperature
0.6150
0.6125
0.6100
0.6075
0.6050
0.6025
0.6000
0.5975
0.5950
0.5925
0.5900
0.5875
0.5850
0.5825
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3542 G07
Output Voltage vs Supply Voltage
0.5
0.4
V_OUT = 1.8V
I_OUT = 100mA
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
2 2.5 3 3.5 4 4.5 5 5.5 6
INPUT VOLTAGE (V)
3542 G10
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)
3542 G08
Output Voltage vs Load Current
2.0
V_IN = 3.6V
1.5 ^VOUT ^{= 1.8V}
Burst Mode
1.0
OPERATION
0.5
0
PULSE SKIP
–0.5
MODE
–1.0
–1.5
–2.0
1
10
100
LOAD CURRENT (mA)
1000
3542 G11
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
3542 G09
R_DS(ON) vs Input Voltage
0.9
0.8
0.7
0.6
MAIN SWITCH
0.5
0.4
0.3
SYNCHRONOUS
SWITCH
0.2
0.1
0
1
2
3
4
5
6
7
V_IN (V)
3542 G12
3542fa
4