Datasheet LT3685 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 36V, 2A, 2.4MHz Step-Down Switching Regulator |
| Pages / Page | 24 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. … |
| File Format / Size | PDF / 282 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Feedback Voltage. Switching Frequency
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LT3685
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Feedback Voltage Switching Frequency Frequency Foldback
840 1.20 1200 R R T = 29.4k T = 29.4k 1.15 1000 820 1.10 800 1.05 TAGE (mV) 800 1.00 600 0.95 FREQUENCY (MHz) 400 FEEDBACK VOL 780 0.90 SWITCHING FREQUENCY (kHz) 200 0.85 760 0.80 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 0 100 200 300 400 500 600 700 800 900 TEMPERATURE (°C) TEMPERATURE (°C) FB PIN VOLTAGE (mV) 3685 G09 3685 G10 3685 G11
Minimum Switch On-Time Soft-Start RUN/SS Pin Current
140 4.0 12 3.5 120 10 3.0 100 8 2.5 80 2.0 6 60 1.5 4 40 1.0 SWITCH CURRENT LIMIT (A) RUN/SS PIN CURRENT (μA) MINIMUM SWITCH ON TIME (ns) 2 20 0.5 0 0 0 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 2 2.5 3 3.5 0 5 10 15 20 25 30 35 TEMPERATURE (˚C) RUN/SS PIN VOLTAGE (V) RUN/SS PIN VOLTAGE (V) 3685 G13 3685 G12 3685 G14
Boost Diode Error Amp Output Current
1.4 50 40 1.2 30 1.0 (V) 20 f 0.8 10 0 0.6 –10 BOOST DIODE V PIN CURRENT (μA) 0.4 CV –20 –30 0.2 –40 0 –50 0 0.5 1.0 1.5 2.0 –200 –100 0 100 200 BOOST DIODE CURRENT (A) FB PIN ERROR VOLTAGE (V) 3685 G15 3685 G16 3685fb 5
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Feedback Voltage Switching Frequency Frequency Foldback
840 1.20 1200 R R T = 29.4k T = 29.4k 1.15 1000 820 1.10 800 1.05 TAGE (mV) 800 1.00 600 0.95 FREQUENCY (MHz) 400 FEEDBACK VOL 780 0.90 SWITCHING FREQUENCY (kHz) 200 0.85 760 0.80 0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 0 100 200 300 400 500 600 700 800 900 TEMPERATURE (°C) TEMPERATURE (°C) FB PIN VOLTAGE (mV) 3685 G09 3685 G10 3685 G11
Minimum Switch On-Time Soft-Start RUN/SS Pin Current
140 4.0 12 3.5 120 10 3.0 100 8 2.5 80 2.0 6 60 1.5 4 40 1.0 SWITCH CURRENT LIMIT (A) RUN/SS PIN CURRENT (μA) MINIMUM SWITCH ON TIME (ns) 2 20 0.5 0 0 0 –50 –25 0 25 50 75 100 125 150 0 0.5 1 1.5 2 2.5 3 3.5 0 5 10 15 20 25 30 35 TEMPERATURE (˚C) RUN/SS PIN VOLTAGE (V) RUN/SS PIN VOLTAGE (V) 3685 G13 3685 G12 3685 G14
Boost Diode Error Amp Output Current
1.4 50 40 1.2 30 1.0 (V) 20 f 0.8 10 0 0.6 –10 BOOST DIODE V PIN CURRENT (μA) 0.4 CV –20 –30 0.2 –40 0 –50 0 0.5 1.0 1.5 2.0 –200 –100 0 100 200 BOOST DIODE CURRENT (A) FB PIN ERROR VOLTAGE (V) 3685 G15 3685 G16 3685fb 5
