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MAX771MJA Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX771MJA Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 20 page frequencies (up to 300kHz), allowing the use of tiny external components. As with traditional PFM converters, the power transistor is not turned on until the voltage comparator senses that the output is out of regulation. However, unlike tra- ditional PFM converters, the MAX770–MAX773 switch using the combination of a peak current limit and a pair of one-shots that set the maximum on-time (16µs) and minimum off-time (2.3µs); there is no oscillator. Once off, the minimum off-time one-shot holds the switch off for 2.3µs. After this minimum time, the switch either 1) stays off if the output is in regulation, or 2) turns on again if the output is out of regulation. The control circuitry allows the ICs to operate in contin- uous-conduction mode (CCM) while maintaining high efficiency with heavy loads. When the power switch is 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers 10 ______________________________________________________________________________________ MAX770 VIN = 3V REF SHDN FB AGND GND N 7 EXT CS C2 0.1 µF C1 100 µF L1 22 µH D1 1N5817 MTP3055EL RSENSE 75m Ω C4 300 µF C3 0.1 µF 5 4 3 6 1 8 2 V+ VOUT = 5V @ 1A Figure 2a. 5V Preset Output, Bootstrapped Figure 2b. 12V Preset Output, Bootstrapped Figure 2c. 12V Output, Non-Bootstrapped Figure 2d. 9V Output, Bootstrapped MAX770 MAX771 MAX772 VIN = 5V REF SHDN AGND GND N 7 EXT CS FB L1 22 µH D1 1N5817 R1 18k C4 200 µF C3 0.1 µF 5 4 6 1 8 3 2 V+ C1 68 µF VOUT = 12V @ 0.5A R2 127k RSENSE 100m Ω C2 0.1 µF VOUT VREF R2 = (R1) ( -1 ) VREF = 1.5V MAX770 MAX771 MAX772 REF SHDN AGND GND N 7 EXT CS FB C1 47 µF L1 20 µH D1 1N5817 R1 28k C4 100 µF C3 0.1 µF 5 4 6 1 8 3 2 V+ VOUT = 9V R2 140k RSENSE C2 0.1 µF VOUT VREF R2 = (R1) ( -1 ) VREF = 1.5V Si9410DY VIN = 4V MAX771 VIN = 5V REF SHDN FB AGND GND N 7 EXT CS C2 0.1 µF C1 68 µF L1 22 µH D1 1N5817 Si9410DY RSENSE 100m Ω C4 200 µF C3 0.1 µF 5 4 3 6 1 8 2 V+ VOUT = 12V @ 0.5A |
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