Datasheet LT8620 (Analog Devices) - 6
| Hersteller | Analog Devices |
| Beschreibung | 65V, 2A Synchronous Step-Down Regulator with 2.5μA Quiescent Current |
| Seiten / Seite | 26 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| Dateiformat / Größe | PDF / 599 Kb |
| Dokumentensprache | Englisch |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Minimum Load to Full Frequency. Burst Frequency
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LT8620
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Minimum Load to Full Frequency Burst Frequency (SYNC DC High) Frequency Foldback
800 100 800 VIN = 12V VOUT = 5V VOUT = 3.3V VOUT = 5V 700 fSW = 700kHz 700 VIN = 12V VSYNC = 0V 80 600 600 RT = 60.4k 500 60 500 400 400 300 40 300 LOAD CURRENT (mA) 200 200 SWITCHING FREQUENCY (kHz) 20 SWITCHING FREQUENCY (kHz) 100 100 0 0 0 0 50 100 150 200 5 15 25 35 45 55 65 0 0.2 0.4 0.6 0.8 1 LOAD CURRENT (mA) INPUT VOLTAGE (V) FB VOLTAGE (V) 8620 G19 8620 G20 8620 G21
Soft-Start Tracking Soft-Start Current PG High Thresholds
1.2 2.2 12.0 VSS = 0.5V 11.5 1.0 (%) REF 11.0 2.1 0.8 10.5 FB RISING 10.0 0.6 2.0 9.5 9.0 FB FALLING FB VOLTAGE (V) 0.4 8.5 SS PIN CURRENT (µA) 1.9 0.2 8.0 PG THRESHOLD OFFSET FROM V 7.5 0 7.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.8 –50 –25 0 25 50 75 100 125 150 TR/SS VOLTAGE (V) –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) TEMPERATURE (°C) 8620 G22 8620 G23 8620 G24
RT Programmed Switching PG Low Thresholds Frequency VIN UVLO
–7.0 250 3.6 –7.5 225 (%) 3.4 REF –8.0 200 3.2 –8.5 175 –9.0 FB RISING 150 3.0 –9.5 125 2.8 –10.0 FB FALLING 100 2.6 –10.5 INPUT VOLTAGE (V) RT PIN RESISTOR (kΩ) 75 2.4 –11.0 50 2.2 PG THRESHOLD OFFSET FROM V –11.5 25 –12.0 0 2.0 –50 –25 0 25 50 75 100 125 150 0.2 0.6 1 1.4 1.8 2.2 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) SWITCHING FREQUENCY (MHz) TEMPERATURE (°C) 8620 G25 8620 G26 8620 G27 8620fa 6 For more information www.linear.com/LT8620 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Minimum Load to Full Frequency Burst Frequency (SYNC DC High) Frequency Foldback
800 100 800 VIN = 12V VOUT = 5V VOUT = 3.3V VOUT = 5V 700 fSW = 700kHz 700 VIN = 12V VSYNC = 0V 80 600 600 RT = 60.4k 500 60 500 400 400 300 40 300 LOAD CURRENT (mA) 200 200 SWITCHING FREQUENCY (kHz) 20 SWITCHING FREQUENCY (kHz) 100 100 0 0 0 0 50 100 150 200 5 15 25 35 45 55 65 0 0.2 0.4 0.6 0.8 1 LOAD CURRENT (mA) INPUT VOLTAGE (V) FB VOLTAGE (V) 8620 G19 8620 G20 8620 G21
Soft-Start Tracking Soft-Start Current PG High Thresholds
1.2 2.2 12.0 VSS = 0.5V 11.5 1.0 (%) REF 11.0 2.1 0.8 10.5 FB RISING 10.0 0.6 2.0 9.5 9.0 FB FALLING FB VOLTAGE (V) 0.4 8.5 SS PIN CURRENT (µA) 1.9 0.2 8.0 PG THRESHOLD OFFSET FROM V 7.5 0 7.0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.8 –50 –25 0 25 50 75 100 125 150 TR/SS VOLTAGE (V) –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) TEMPERATURE (°C) 8620 G22 8620 G23 8620 G24
RT Programmed Switching PG Low Thresholds Frequency VIN UVLO
–7.0 250 3.6 –7.5 225 (%) 3.4 REF –8.0 200 3.2 –8.5 175 –9.0 FB RISING 150 3.0 –9.5 125 2.8 –10.0 FB FALLING 100 2.6 –10.5 INPUT VOLTAGE (V) RT PIN RESISTOR (kΩ) 75 2.4 –11.0 50 2.2 PG THRESHOLD OFFSET FROM V –11.5 25 –12.0 0 2.0 –50 –25 0 25 50 75 100 125 150 0.2 0.6 1 1.4 1.8 2.2 –55 –25 5 35 65 95 125 155 TEMPERATURE (°C) SWITCHING FREQUENCY (MHz) TEMPERATURE (°C) 8620 G25 8620 G26 8620 G27 8620fa 6 For more information www.linear.com/LT8620 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts