Datasheet LT3684 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 36V, 2A, 2.8MHz Step-Down Switching Regulator |
| Pages / Page | 24 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted). … |
| File Format / Size | PDF / 426 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted). Feedback Voltage. Switching Frequency
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LT3684
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted) Feedback Voltage Switching Frequency Frequency Foldback
1.290 1.20 1200 RT = 45.3k RT = 45.3k 1.285 1.15 1000 1.280 1.10 800 1.275 1.05 1.270 1.00 600 1.265 0.95 FREQUENCY (MHz) 400 FEEDBACK VOLTAGE (V) 1.260 0.90 SWITCHING FREQUENCY (kHz) 200 1.255 0.85 1.250 0.80 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0 200 400 600 800 1000 1200 1400 TEMPERATURE (°C) TEMPERATURE (°C) FB PIN VOLTAGE (mV) 3684 G10 3684 G11 3684 G12
Minimum Switch On-Time Soft-Start RUN/SS Pin Current
140 4.0 12 120 3.5 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) 20 2 0.5 0 0 0 –50 –25 0 25 50 75 100 125 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) 3684 G13 3684 G14 3684 G15
Boost Diode Error Amp Output Current Minimum Input Voltage
1.6 100 4.5 1.4 80 4.0 1.2 60 (V) f 40 1.0 3.5 20 0.8 0 0.6 3.0 BOOST DIODE V PIN CURRENT (µA) –20 INPUT VOLTAGE (V) 0.4 V C –40 V 2.5 OUT = 3.3V T 0.2 A = 25°C –60 L = 4.7µH f = 800kHz 0 –80 2.0 0 0.5 1.0 1.5 2.0 1.065 1.165 1 .265 1.365 1.465 0.001 0.01 0.1 1 10 BOOST DIODE CURRENT (A) FB PIN VOLTAGE (V) LOAD CURRENT (A) 3684 G16 3684 G17 3684 G18 3684fa For more information www.linear.com/LT3684 5
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise noted) Feedback Voltage Switching Frequency Frequency Foldback
1.290 1.20 1200 RT = 45.3k RT = 45.3k 1.285 1.15 1000 1.280 1.10 800 1.275 1.05 1.270 1.00 600 1.265 0.95 FREQUENCY (MHz) 400 FEEDBACK VOLTAGE (V) 1.260 0.90 SWITCHING FREQUENCY (kHz) 200 1.255 0.85 1.250 0.80 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 0 200 400 600 800 1000 1200 1400 TEMPERATURE (°C) TEMPERATURE (°C) FB PIN VOLTAGE (mV) 3684 G10 3684 G11 3684 G12
Minimum Switch On-Time Soft-Start RUN/SS Pin Current
140 4.0 12 120 3.5 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) 20 2 0.5 0 0 0 –50 –25 0 25 50 75 100 125 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) 3684 G13 3684 G14 3684 G15
Boost Diode Error Amp Output Current Minimum Input Voltage
1.6 100 4.5 1.4 80 4.0 1.2 60 (V) f 40 1.0 3.5 20 0.8 0 0.6 3.0 BOOST DIODE V PIN CURRENT (µA) –20 INPUT VOLTAGE (V) 0.4 V C –40 V 2.5 OUT = 3.3V T 0.2 A = 25°C –60 L = 4.7µH f = 800kHz 0 –80 2.0 0 0.5 1.0 1.5 2.0 1.065 1.165 1 .265 1.365 1.465 0.001 0.01 0.1 1 10 BOOST DIODE CURRENT (A) FB PIN VOLTAGE (V) LOAD CURRENT (A) 3684 G16 3684 G17 3684 G18 3684fa For more information www.linear.com/LT3684 5
