LTC3543 Datasheet, PDF (4/16 Pages) Linear Technology – 600mA Synchronous Step Down Buck Regulator with PLL, Soft-Start and Spread Spectrum

LTC3543
TYPICAL PERFOR A CE CHARACTERISTICS T_A = 25°C unless otherwise noted.
Switching Frequency
vs Input Voltage (V_IN)
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
2.5
3.0 3.5 4.0 4.5
INPUT VOLTAGE (V)
5.0 5.5
3543 G10
Feedback Voltage (V_FB)
vs Input Voltage (V_IN)
612
610
608
606
604
602
600
598
596
594
592
590
588
2.5
3.0 3.5 4.0 4.5
INPUT VOLTAGE (V)
5.0 5.5
3543 G13
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
4
Switching Frequency
vs Temperature
2.40 _{VIN = 3.6V}
2.35
2.30
2.25
2.20
2.15
2.10
2.05
2.00
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
3543 G11
Feedback Voltage (V_FB) vs
Temperature
612
610
V_IN = 3.6V
608
606
604
602
600
598
596
594
592
590
588
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
3543 G14
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
Output Voltage vs Load Current
1.56
1.54
1.52
1.50
1.48
1.46
0
V_IN = 2.7V
V_IN = 3.6V
V_IN = 4.2V
200 400 600 800
OUTPUT VOLTAGE (V)
1000
3543 G12
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
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
3543f