Datasheet LT1913 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | 25V, 3.5A, 2.4MHz Step-Down Switching Regulator |
| Pages / Page | 24 / 5 — TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted. … |
| File Format / Size | PDF / 292 Kb |
| Document Language | English |
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted. Feedback Voltage. Switching Frequency
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LT1913
W U TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted. Feedback Voltage Switching Frequency Frequency Foldback
840 1.20 1200 RT = 34.0k RT = 34.0k 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) 1913 G12 1913 G13 1913 G14
Minimum Switch On-Time Soft-Start RUN/SS Pin Current
140 7 12 120 6 10 100 5 8 80 4 6 60 3 4 40 2 SWITCH CURRENT LIMIT (A) RUN/SS PIN CURRENT (μA) MINIMUM SWITCH ON TIME (ns) 2 20 1 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 TEMPERATURE (°C) RUN/SS PIN VOLTAGE (V) RUN/SS PIN VOLTAGE (V) 1913 G15 1913 G16 1913 G17
Boost Diode Error Amp Output Current Minimum Input Voltage
1.4 50 5.0 40 1.2 4.5 30 1.0 20 (V) F 4.0 10 0.8 TAGE (V) 0 3.5 0.6 –10 PIN CURRENT (μA) 3.0 BOOST DIODE V 0.4 C INPUT VOL V –20 V –30 OUT = 3.3V 2.5 T 0.2 A = 25°C –40 L = 4.7μH f = 600kHz 0 –50 2.0 0 0.5 1.0 1.5 2.0 –200 –100 0 100 200 1 10 100 1000 10000 BOOST DIODE CURRENT (A) FB PIN ERROR VOLTAGE (mV) LOAD CURRENT (mA) 1913 G18 1913 G19 1913 G20 1913f 5
W U TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted. Feedback Voltage Switching Frequency Frequency Foldback
840 1.20 1200 RT = 34.0k RT = 34.0k 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) 1913 G12 1913 G13 1913 G14
Minimum Switch On-Time Soft-Start RUN/SS Pin Current
140 7 12 120 6 10 100 5 8 80 4 6 60 3 4 40 2 SWITCH CURRENT LIMIT (A) RUN/SS PIN CURRENT (μA) MINIMUM SWITCH ON TIME (ns) 2 20 1 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 TEMPERATURE (°C) RUN/SS PIN VOLTAGE (V) RUN/SS PIN VOLTAGE (V) 1913 G15 1913 G16 1913 G17
Boost Diode Error Amp Output Current Minimum Input Voltage
1.4 50 5.0 40 1.2 4.5 30 1.0 20 (V) F 4.0 10 0.8 TAGE (V) 0 3.5 0.6 –10 PIN CURRENT (μA) 3.0 BOOST DIODE V 0.4 C INPUT VOL V –20 V –30 OUT = 3.3V 2.5 T 0.2 A = 25°C –40 L = 4.7μH f = 600kHz 0 –50 2.0 0 0.5 1.0 1.5 2.0 –200 –100 0 100 200 1 10 100 1000 10000 BOOST DIODE CURRENT (A) FB PIN ERROR VOLTAGE (mV) LOAD CURRENT (mA) 1913 G18 1913 G19 1913 G20 1913f 5
