LTC3548A Datasheet, PDF (4/20 Pages) Linear Technology – Dual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator

LTC3548A
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise specified.
Burst Mode Operation
SW
5V/DIV
V_OUT
50mV/DIV
Pulse-Skipping Mode
SW
5V/DIV
V_OUT
10mV/DIV
I_L
200mA/DIV
V_IN = 3.6V
2μs/DIV
V_OUT = 1.8V
I_LOAD = 50mA
FIGURE 3 CIRCUIT
3548A G01
I_L
100mA/DIV
V_IN = 3.6V
1μs/DIV
V_OUT = 1.8V
I_LOAD = 50mA
FIGURE 3 CIRCUIT
3548A G02
Load Step
V_OUT1
200mV/DIV
V_OUT2
100mV/DIV
I_L
500mA/DIV
I_LOAD
500mA/DIV
Soft-Start
V_IN
2V/DIV
V_OUT1
1V/DIV
I_L
500mA/DIV
V_IN = 3.6V
20μs/DIV
V_OUT = 1.8V
I_LOAD = 50mA TO 600mA
FIGURE 3 CIRCUIT
Efficiency vs Input Voltage
100
100mA
90
800mA
80
10mA
1mA
70
60
50
40
30
20
10 V_OUT = 1.8V
CIRCUIT OF FIGURE 3
0
2
3
4
5
6
INPUT VOLTAGE (V)
3548A G05
4
3548A G03
V_IN = 3.6V
1ms/DIV
V_OUT = 1.8V
I_LOAD = 500mA
FIGURE 4 CIRCUIT
3548A G04
Oscillator Frequency
vs Temperature
2.5
V_IN = 3.6V
2.4
2.3
2.2
2.1
2.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3548A G06
Oscillator Frequency
vs Supply Voltage
10
8
6
4
2
0
–2
–4
–6
–8
–10
2
3
4
5
SUPPLY VOLTAGE (V)
6
3548A G07
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