Datasheet LT8640, LT8640-1 (Analog Devices) - 7
| Fabricante | Analog Devices |
| Descripción | 42V, 5A Synchronous Step-Down Silent Switcher with 2.5µA Quiescent Current |
| Páginas / Página | 30 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. Dropout Voltage. Switching … |
| Revisión | D |
| Formato / tamaño de archivo | PDF / 1.8 Mb |
| Idioma del documento | Inglés |
TYPICAL PERFORMANCE CHARACTERISTICS. Dropout Voltage. Switching Frequency. Burst Frequency. Minimum Load to Full Frequency
Línea de modelo para esta hoja de datos
- LT8640EUDC#PBF LT8640EUDC#TRPBF LT8640EUDC-1#PBF LT8640EUDC-1#TRPBF LT8640EUDCF#PBF LT8640EUDCF#TRPBF LT8640EUDCF-1#PBF LT8640EUDCF-1#TRPBF LT8640HUDC#PBF LT8640HUDC#TRPBF LT8640HUDC-1#PBF LT8640HUDC-1#TRPBF LT8640HUDCF#PBF LT8640HUDCF#TRPBF LT8640IUDC#PBF LT8640IUDC#TRPBF LT8640IUDC-1#PBF LT8640IUDC-1#TRPBF LT8640IUDCF#PBF LT8640IUDCF#TRPBF LT8640IUDCF-1#PBF LT8640IUDCF-1#TRPBF LT8640JUDCF#PBF LT8640JUDCF#TRPBF LT8640JUDCF#WPBF LT8640JUDCF#WTRPBF LT8640JUDCF-1#PBF LT8640JUDCF-1#TRPBF LT8640JUDCF-1#WPBF LT8640JUDCF-1#WTRPBF
Versión de texto del documento
LT8640/LT8640-1
TYPICAL PERFORMANCE CHARACTERISTICS Dropout Voltage Switching Frequency Burst Frequency
600 740 1200 R FRONT PAGE APPLICATION V T = 60.4k IN = 5V V V 730 IN = 12V 500 OUT SET TO REGULATE AT 5V 1000 V L = IHLP3232DZ-01, 1µH OUT = 5V 720 400 800 710 300 700 600 690 200 400 DROPOUT VOLTAGE (mV) 680 100 SWITCHING FREQUENCY (kHz) SWITCHING FREQUENCY (kHz) 200 670 0 660 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 –50 –25 0 25 50 75 100 125 150 0 100 200 300 400 LOAD CURRENT (A) TEMPERATURE (°C) LOAD CURRENT (mA) 8640 G19 8640 G20 8640 G21
Minimum Load to Full Frequency (Pulse-Skipping Mode) Frequency Foldback Soft-Start Tracking
100 800 1.2 FRONT PAGE APPLICATION VOUT = 3.3V VOUT = 5V 700 VIN = 12V fSW = 1MHz VSYNC = 0V 1.0 80 600 RT = 60.4k 0.8 500 60 400 0.6 40 300 FB VOLTAGE (V) 0.4 LOAD CURRENT (mA) 200 20 SWITCHING FREQUENCY (kHz) 0.2 100 0 0 0 5 10 15 20 25 30 35 40 45 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 INPUT VOLTAGE (V) FB VOLTAGE (V) TR/SS VOLTAGE (V) 8640 G22 8640 G23 8640 G24
Soft-Start Current PG High Thresholds PG Low Thresholds
2.2 10.0 –6.0 VSS = 0.5V 2.1 (%) 9.5 (%) –6.5 REF REF 2.0 9.0 –7.0 1.9 8.5 –7.5 FB RISING 1.8 8.0 FB RISING –8.0 1.7 7.5 FB FALLING –8.5 FB FALLING SS PIN CURRENT (µA) 1.6 7.0 –9.0 1.5 6.5 –9.5 PG THRESHOLD OFFSET FROM V PG THRESHOLD OFFSET FROM V 1.4 6.0 –10.0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8640 G25 8640 G26 8640 G27 Rev. D For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Dropout Voltage Switching Frequency Burst Frequency
600 740 1200 R FRONT PAGE APPLICATION V T = 60.4k IN = 5V V V 730 IN = 12V 500 OUT SET TO REGULATE AT 5V 1000 V L = IHLP3232DZ-01, 1µH OUT = 5V 720 400 800 710 300 700 600 690 200 400 DROPOUT VOLTAGE (mV) 680 100 SWITCHING FREQUENCY (kHz) SWITCHING FREQUENCY (kHz) 200 670 0 660 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 –50 –25 0 25 50 75 100 125 150 0 100 200 300 400 LOAD CURRENT (A) TEMPERATURE (°C) LOAD CURRENT (mA) 8640 G19 8640 G20 8640 G21
Minimum Load to Full Frequency (Pulse-Skipping Mode) Frequency Foldback Soft-Start Tracking
100 800 1.2 FRONT PAGE APPLICATION VOUT = 3.3V VOUT = 5V 700 VIN = 12V fSW = 1MHz VSYNC = 0V 1.0 80 600 RT = 60.4k 0.8 500 60 400 0.6 40 300 FB VOLTAGE (V) 0.4 LOAD CURRENT (mA) 200 20 SWITCHING FREQUENCY (kHz) 0.2 100 0 0 0 5 10 15 20 25 30 35 40 45 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 INPUT VOLTAGE (V) FB VOLTAGE (V) TR/SS VOLTAGE (V) 8640 G22 8640 G23 8640 G24
Soft-Start Current PG High Thresholds PG Low Thresholds
2.2 10.0 –6.0 VSS = 0.5V 2.1 (%) 9.5 (%) –6.5 REF REF 2.0 9.0 –7.0 1.9 8.5 –7.5 FB RISING 1.8 8.0 FB RISING –8.0 1.7 7.5 FB FALLING –8.5 FB FALLING SS PIN CURRENT (µA) 1.6 7.0 –9.0 1.5 6.5 –9.5 PG THRESHOLD OFFSET FROM V PG THRESHOLD OFFSET FROM V 1.4 6.0 –10.0 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 8640 G25 8640 G26 8640 G27 Rev. D For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts