Datasheet LTC7149 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | 60V, 4A Synchronous Step-Down Regulator for Inverting Outputs |
| Pages / Page | 26 / 6 — Switching Frequency/Period. Switching Frequency. vs RT. vs Temperature. … |
| File Format / Size | PDF / 482 Kb |
| Document Language | English |
Switching Frequency/Period. Switching Frequency. vs RT. vs Temperature. Start-Up Waveform. Discontinuous Conduction Mode
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LTC7149 TYPICAL PERFORMANCE CHARACTERISTICS
Switching Frequency/Period Switching Frequency vs RT vs Temperature Start-Up Waveform
3.0 3500 1010 VRUN 2.5 3000 1005 2V/DIV FREQUENCY 2500 IL 2.0 PERIOD (ns) 2A/DIV PERIOD 2000 1000 V – OUT 1.5 5V/DIV 1500 995 VPGOOD FREQUENCY (MHz) 1.0 FREQUENCY (kHz) 5V/DIV 1000 0.5 990 500 5ms/DIV 7149 G12 0 0 985 0 50 100 150 200 250 300 350 –55 –35 –15 5 25 45 65 85 105 125 RT RESISTOR (kΩ) TEMPERATURE (°C) 7149 G10 7149 G11
Discontinuous Conduction Mode Continuous Conduction Mode Run Rising Threshold Operation Operation vs Temperature
1.210 1.205 VSW VSW 10V/DIV 10V/DIV 1.200 1.195 I I L L 1A/DIV 1.190 1A/DIV RUN RISING THRESHOLD (V) 7149 G13 7149 G14 1.185 2µs/DIV 500ns/DIV 1.180–55 –35 –15 5 25 45 65 85 105 125 TEMPERATURE (°C) 7149 G15
Maximum Output Current vs Efficiency vs Load Current, Efficiency vs Load Current, Input Voltage VOUT – = –5V VOUT – = –12V Maximum Load Current vs. VIN –5VOUT OUT
4.0 100 100 3.6 95 3.2 95 90 2.8 90 2.4 85 (A) 2.0 85 80 I OUT 1.6 75 EFFICIENCY (%) EFFICIENCY (%) 1.2 80 VIN = 12V 70 VIN = 12V 0.8 VOUT = –3.3V VIN = 24V V 75 IN = 24V V 65 V 0.4 OUT = –5V VIN = 36V IN = 36V VOUT = –12V VIN = 48V VIN = 48V 0 70 60 0 10 20 30 40 50 60 0 0.5 1 1.5 2 2.5 3 3.5 4 0 0.5 1 1.5 2 2.5 3 3.5 4 VIN (V) I I OUT (A) OUT (A) 7149 G16 7149 G17 7149 G18 7149fa 6 For more information www.linear.com/LTC7149
Switching Frequency/Period Switching Frequency vs RT vs Temperature Start-Up Waveform
3.0 3500 1010 VRUN 2.5 3000 1005 2V/DIV FREQUENCY 2500 IL 2.0 PERIOD (ns) 2A/DIV PERIOD 2000 1000 V – OUT 1.5 5V/DIV 1500 995 VPGOOD FREQUENCY (MHz) 1.0 FREQUENCY (kHz) 5V/DIV 1000 0.5 990 500 5ms/DIV 7149 G12 0 0 985 0 50 100 150 200 250 300 350 –55 –35 –15 5 25 45 65 85 105 125 RT RESISTOR (kΩ) TEMPERATURE (°C) 7149 G10 7149 G11
Discontinuous Conduction Mode Continuous Conduction Mode Run Rising Threshold Operation Operation vs Temperature
1.210 1.205 VSW VSW 10V/DIV 10V/DIV 1.200 1.195 I I L L 1A/DIV 1.190 1A/DIV RUN RISING THRESHOLD (V) 7149 G13 7149 G14 1.185 2µs/DIV 500ns/DIV 1.180–55 –35 –15 5 25 45 65 85 105 125 TEMPERATURE (°C) 7149 G15
Maximum Output Current vs Efficiency vs Load Current, Efficiency vs Load Current, Input Voltage VOUT – = –5V VOUT – = –12V Maximum Load Current vs. VIN –5VOUT OUT
4.0 100 100 3.6 95 3.2 95 90 2.8 90 2.4 85 (A) 2.0 85 80 I OUT 1.6 75 EFFICIENCY (%) EFFICIENCY (%) 1.2 80 VIN = 12V 70 VIN = 12V 0.8 VOUT = –3.3V VIN = 24V V 75 IN = 24V V 65 V 0.4 OUT = –5V VIN = 36V IN = 36V VOUT = –12V VIN = 48V VIN = 48V 0 70 60 0 10 20 30 40 50 60 0 0.5 1 1.5 2 2.5 3 3.5 4 0 0.5 1 1.5 2 2.5 3 3.5 4 VIN (V) I I OUT (A) OUT (A) 7149 G16 7149 G17 7149 G18 7149fa 6 For more information www.linear.com/LTC7149
