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LTM8073 Datasheet(PDF) 13 Page - Linear Technology |
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LTM8073 Datasheet(HTML) 13 Page - Linear Technology |
13 / 26 page LTM8073 13 8073fa For more information www.linear.com/LTM8073 applicaTions inForMaTion For most applications, the design process is straight- forward, summarized as follows: 1. Look at Table 1 and find the row that has the desired input range and output voltage. 2. Apply the recommended CIN, COUT, RFB and RT values. 3. Apply the CFF (from AUX to FB) capacitor as required. 4. Connect BIAS as indicated. While these component combinations have been tested for proper operation, it is incumbent upon the user to verify proper operation over the intended system’s line, load and environmental conditions. Bear in mind that the maximum output current is limited by junction temperature, the relationship between the input and output voltage mag- nitude and polarity and other factors. Please refer to the graphs in the Typical Performance Characteristics section for guidance. The maximum frequency (and attendant RT value) at which the LTM8073 should be allowed to switch is given in Table 1 in the Maximum fSW column, while the recom- mended frequency (and RT value) for optimal efficiency over the given input condition is given in the fSW column. There are additional conditions that must be satisfied if the synchronization function is used. Please refer to the Synchronization section for details. Table 1. Recommended Component Values and Configuration (TA = 25°C) VIN (Note 1) VOUT RFB CIN (Note 2) COUT CFF BIAS fSW RT MAX fSW MIN RT 3.4V to 60V 0.8V Open 1µF 100V 1206 X7R 2× 100µF 4V 0805 X5R 47pF 5V 450kHz 95.3k 475kHz 90.9k 3.4V to 60V 1V 1M 1µF 100V 1206 X7R 2× 100µF 4V 0805 X5R 47pF 5V 450kHz 95.3k 550kHz 76.8k 3.4V to 60V 1.2V 499k 1µF 100V 1206 X7R 2× 100µF 4V 0805 X5R 47pF 5V 500kHz 84.5k 650kHz 63.4k 3.4V to 60V 1.5V 287k 1µF 100V 1206 X7R 100µF 4V 0805 X5R 27pF 5V 500kHz 84.5k 750kHz 54.9k 3.4V to 60V 1.8V 200k 1µF 100V 1206 X7R 100µF 4V 0805 X5R 10pF 5V 500kHz 84.5k 900kHz 45.6k 3.4V to 60V 2V 169k 1µF 100V 1206 X7R 100µF 4V 0805 X5R 5V 600kHz 64.8k 950kHz 42.2k 4V to 60V 2.5V 118k 1µF 100V 1206 X7R 100µF 4V 0805 X5R 5V 800kHz 51.1k 1.2MHz 32.4K 5V to 60V 3.3V 80.6k 1µF 100V 1206 X7R 100µF 4V 0805 X5R 5V 850kHz 47.5k 1.5MHz 24.3k 7V to 60V 5V 47.5k 1µF 100V 1206 X7R 100µF 6.3V 1206 X5R 5V 1.2MHz 32.4k 2.2MHz 16.9k 11V to 60V 8V 28k 1µF 100V 1206 X7R 47µF 16V 1210 X7R 5V 1.4MHz 26.7k 3MHZ 10k 16V to 60V 12V 17.8k 1µF 100V 1206 X7R 22µF 25V 1210 X5R 5V 1.4MHz 26.7k 3MHZ 10k 19.5V to 60V 15V 14.3k 1µF 100V 1206 X7R 22µF 25V 1210 X5R 5V 1.4MHz 26.7k 3MHZ 10k 3.4V to 56V –3.3V 80.6k 1µF 100V 1206 X7R 100µF 4V 0805 X5R LTM8073 GND 850kHz 47.5k 1.5MHz 24.3k 3.4V to 55V –5V 47.5k 1µF 100V 1206 X7R 100µF 6.3V 1206 X5R LTM8073 GND 1.2MHz 32.4k 2.2MHz 16.9k 3.4V to 52V –8V 28k 1µF 100V 1206 X7R 47µF 16V 1210 X7R LTM8073 GND 1.4MHz 26.7k 3MHZ 10k 3.4V to 48V –12V 17.8k 1µF 100V 1206 X7R 22µF 25V 1210 X5R LTM8073 GND 1.4MHz 26.7k 3MHZ 10k 3.4V to 45V –15V 14.3k 1µF 100V 1206 X7R 22µF 25V 1210 X5R LTM8073 GND 1.4MHz 26.7k 3MHZ 10k Note 1: The LTM8073 may be capable of lower input voltages but may skip switching cycles. Note 2: An input bulk capacitor is required. |
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