Datasheet LT8609S (Analog Devices) - 6
| Manufacturer | Analog Devices |
| Description | 42V, 2A/3A Peak Synchronous Step-Down Regulator with 2.5µA Quiescent Current |
| Pages / Page | 24 / 6 — TYPICAL PERFORMANCE CHARACTERISTICS. Minimum Load to Full Frequency. … |
| Revision | D |
| File Format / Size | PDF / 2.1 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Minimum Load to Full Frequency. Burst Frequency vs Load Current. (SYNC Float to 1.9V)
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LT8609S
TYPICAL PERFORMANCE CHARACTERISTICS Minimum Load to Full Frequency Burst Frequency vs Load Current (SYNC Float to 1.9V) Frequency Foldback
2500 100 2500 L = 2.2µH VOUT = 5V VIN = 12V VOUT = 3.3V 90 fSW = 700kHz VOUT = 3.3V 2000 VIN = 12V SYNC = FLOAT SYNC = 0V SYNC = 0V 80 2000 RT = 18.2k 70 1500 60 1500 50 1000 40 1000 FREQUENCY (kHz) FREQUENCY (kHz) LOAD CURRENT (mA) 30 500 20 500 10 0 0 0 0 200 400 600 0 10 20 30 40 50 0 0.2 0.4 0.6 0.8 1 LOAD CURRENT (mA) INPUT VOLTAGE (V) FB VOLTAGE (V) 8609S G18 8609S G19 8609S G20
Soft-Start Tracking Soft-Start Current vs Temperature VIN UVLO
1.0 2.5 3.5 V 0.9 2.4 SS = 0.1V 3 0.8 2.3 0.7 2.2 2.5 0.6 2.1 2 TAGE (V) 0.5 2.0 T CURRENT (µA) UVLO (V) 0.4 AR 1.9 1.5 FB VOL V IN 0.3 T ST 1.8 1 0.2 SOF 1.7 0.5 0.1 1.6 0 1.5 0 0 0.1 0.2 0.4 0.5 0.6 0.7 0.8 1.0 1.1 1.2 –50 –30 –10 10 30 50 70 90 110 130 150 –55 –25 5 35 65 95 125 155 SS VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 8609S G21 8609S G22 8609S G23
Switching Waveforms Switching Waveforms Switching Waveforms
IL IL IL 500mA/DIV 200mA/DIV 500mA/DIV VSW VSW VSW 5V/DIV 5V/DIV 10V/DIV 8609S G24 8609S G25 8609S G26 200ns/DIV 2µs/DIV 200ns/DIV 12VIN TO 5VOUT AT 1A 12VIN TO 5VOUT AT 25mA 36VIN TO 5VOUT AT 1A SYNC = 0 (Burst Mode OPERATION) Rev. D 6 For more information www.analog.com 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 Minimum Load to Full Frequency Burst Frequency vs Load Current (SYNC Float to 1.9V) Frequency Foldback
2500 100 2500 L = 2.2µH VOUT = 5V VIN = 12V VOUT = 3.3V 90 fSW = 700kHz VOUT = 3.3V 2000 VIN = 12V SYNC = FLOAT SYNC = 0V SYNC = 0V 80 2000 RT = 18.2k 70 1500 60 1500 50 1000 40 1000 FREQUENCY (kHz) FREQUENCY (kHz) LOAD CURRENT (mA) 30 500 20 500 10 0 0 0 0 200 400 600 0 10 20 30 40 50 0 0.2 0.4 0.6 0.8 1 LOAD CURRENT (mA) INPUT VOLTAGE (V) FB VOLTAGE (V) 8609S G18 8609S G19 8609S G20
Soft-Start Tracking Soft-Start Current vs Temperature VIN UVLO
1.0 2.5 3.5 V 0.9 2.4 SS = 0.1V 3 0.8 2.3 0.7 2.2 2.5 0.6 2.1 2 TAGE (V) 0.5 2.0 T CURRENT (µA) UVLO (V) 0.4 AR 1.9 1.5 FB VOL V IN 0.3 T ST 1.8 1 0.2 SOF 1.7 0.5 0.1 1.6 0 1.5 0 0 0.1 0.2 0.4 0.5 0.6 0.7 0.8 1.0 1.1 1.2 –50 –30 –10 10 30 50 70 90 110 130 150 –55 –25 5 35 65 95 125 155 SS VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 8609S G21 8609S G22 8609S G23
Switching Waveforms Switching Waveforms Switching Waveforms
IL IL IL 500mA/DIV 200mA/DIV 500mA/DIV VSW VSW VSW 5V/DIV 5V/DIV 10V/DIV 8609S G24 8609S G25 8609S G26 200ns/DIV 2µs/DIV 200ns/DIV 12VIN TO 5VOUT AT 1A 12VIN TO 5VOUT AT 25mA 36VIN TO 5VOUT AT 1A SYNC = 0 (Burst Mode OPERATION) Rev. D 6 For more information www.analog.com 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
