Datasheet LT8612 (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | 42V, 6A Synchronous Step-Down Regulator with 3μA Quiescent Current |
| Pages / Page | 22 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Frequency Foldback. Soft-Start … |
| File Format / Size | PDF / 365 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Frequency Foldback. Soft-Start Tracking. Soft-Start Current. RT Programmed Switching
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LT8612
TYPICAL PERFORMANCE CHARACTERISTICS Frequency Foldback Soft-Start Tracking Soft-Start Current
800 1.2 2.4 VOUT = 3.3V VSS = 0.5V 700 VIN = 12V 2.3 VSYNC = 0V 1.0 600 RT = 60.4k 2.2 0.8 500 2.1 400 0.6 2.0 300 FB VOLTAGE (V) 1.9 0.4 SS PIN CURRENT (µA) 200 1.8 SWITCHING FREQUENCY (kHz) 0.2 100 1.7 0 0 1.6 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 –50 –25 5 35 65 95 125 155 FB VOLTAGE (V) TR/SS VOLTAGE (V) TEMPERATURE (°C) 8612 G19 8612 G20 8612 G21
RT Programmed Switching PG High Thresholds PG Low Thresholds Frequency
12.0 –7.0 250 11.5 –7.5 225 (%) (%) REF 11.0 REF –8.0 200 10.5 FB RISING –8.5 175 10.0 –9.0 150 FB FALLING FB RISING 9.5 –9.5 125 9.0 –10.0 FB FALLING 100 8.5 –10.5 RT PIN RESISTOR (kΩ) 75 8.0 –11.0 50 PG THRESHOLD OFFSET FROM V 7.5 PG THRESHOLD OFFSET FROM V –11.5 25 7.0 –12.0 0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 0.2 0.6 1 1.4 1.8 2.2 TEMPERATURE (°C) TEMPERATURE (°C) SWITCHING FREQUENCY (MHz) 8612 G22 8612 G23 8612 G24
VIN UVLO Switching Waveforms Switching Waveforms
3.6 3.4 IL I 1A/DIV 3.2 L 0.5A/DIV 3.0 VSW VSW 2.8 5V/DIV 5V/DIV 2.6 8612 G26 INPUT VOLTAGE (V) 5µs/DIV 1µs/DIV 8612 G27 2.4 12VIN TO 5VOUT AT 20mA; FRONT PAGE APP 12VIN TO 5VOUT AT 2A VSYNC = 0V 2.2 FRONT PAGE APP 2.0–55 –25 5 35 65 95 125 155 TEMPERATURE (°C) 8612 G25 8612fa 6 For more information www.linear.com/LT8612 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Frequency Foldback Soft-Start Tracking Soft-Start Current
800 1.2 2.4 VOUT = 3.3V VSS = 0.5V 700 VIN = 12V 2.3 VSYNC = 0V 1.0 600 RT = 60.4k 2.2 0.8 500 2.1 400 0.6 2.0 300 FB VOLTAGE (V) 1.9 0.4 SS PIN CURRENT (µA) 200 1.8 SWITCHING FREQUENCY (kHz) 0.2 100 1.7 0 0 1.6 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 –50 –25 5 35 65 95 125 155 FB VOLTAGE (V) TR/SS VOLTAGE (V) TEMPERATURE (°C) 8612 G19 8612 G20 8612 G21
RT Programmed Switching PG High Thresholds PG Low Thresholds Frequency
12.0 –7.0 250 11.5 –7.5 225 (%) (%) REF 11.0 REF –8.0 200 10.5 FB RISING –8.5 175 10.0 –9.0 150 FB FALLING FB RISING 9.5 –9.5 125 9.0 –10.0 FB FALLING 100 8.5 –10.5 RT PIN RESISTOR (kΩ) 75 8.0 –11.0 50 PG THRESHOLD OFFSET FROM V 7.5 PG THRESHOLD OFFSET FROM V –11.5 25 7.0 –12.0 0 –55 –25 5 35 65 95 125 155 –55 –25 5 35 65 95 125 155 0.2 0.6 1 1.4 1.8 2.2 TEMPERATURE (°C) TEMPERATURE (°C) SWITCHING FREQUENCY (MHz) 8612 G22 8612 G23 8612 G24
VIN UVLO Switching Waveforms Switching Waveforms
3.6 3.4 IL I 1A/DIV 3.2 L 0.5A/DIV 3.0 VSW VSW 2.8 5V/DIV 5V/DIV 2.6 8612 G26 INPUT VOLTAGE (V) 5µs/DIV 1µs/DIV 8612 G27 2.4 12VIN TO 5VOUT AT 20mA; FRONT PAGE APP 12VIN TO 5VOUT AT 2A VSYNC = 0V 2.2 FRONT PAGE APP 2.0–55 –25 5 35 65 95 125 155 TEMPERATURE (°C) 8612 G25 8612fa 6 For more information www.linear.com/LT8612 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
