LTC3543_15 Datasheet, PDF (4/20 Pages) Linear Technology – 600mA Synchronous Step Down Buck Regulator with PLL, Soft-Start and Spread Spectrum

LTC3543
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
R_DS(ON) vs Input Voltage (V_IN)
500
450
400
350
MAIN SWITCH
300
250
SYNCHRONOUS SWITCH
200
150
100
50
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
3543 G07
Main Switch Resistance
vs Temperature
500
450
V_IN = 2.7V
400
V_IN = 3.6V
350
300
V_IN = 4.2V
250
200
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
3543 G08
Synchronous Switch Resistance
vs Temperature
500
450
400
V_IN = 2.7V
V_IN = 3.6V
350
300
V_IN = 4.2V
250
200
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
3543 G09
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
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
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
4
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
Feedback Voltage (V_FB)
vs Temperature
612
610 ^{VIN = 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
3543fa