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MAX763ACSA Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX763ACSA Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 12 page __________________General Description The MAX748A/MAX763A are 3.3V-output CMOS, step- down switching regulators. The MAX748A accepts inputs from 3.3V to 16V and delivers up to 500mA. The MAX763A accepts inputs between 3.3V and 11V and delivers up to 500mA. Typical efficiencies are 85% to 90%. Quiescent supply current is 1.4mA (MAX763A), and only 0.2µA in shutdown. Pulse-width-modulation (PWM) current-mode control pro- vides precise output regulation and excellent transient responses. Output voltage accuracy is guaranteed to be ±5% over line, load, and temperature variations. Fixed-frequency switching allows easy filtering of output ripple and noise, as well as the use of small external components. A 22µH inductor works in most applica- tions, so no magnetics design is necessary. The MAX748A/MAX763A also feature cycle-by-cycle cur- rent limiting, overcurrent limiting, undervoltage lockout, and programmable soft-start protection. The MAX748A is available in 8-pin DIP and 16-pin wide SO packages; the MAX763A comes in 8-pin DIP and SO packages. ___________________________Applications 5V-to-3.3V Converters Cellular Phones Portable Instruments Hand-Held Computers Computer Peripherals ________________________________Features o Up to 500mA Load Currents o Guaranteed 159kHz to 219.5kHz Current-Mode PWM o 85% to 90% Efficiencies o 1.7mA Quiescent Current (MAX748A) 1.4mA Quiescent Current (MAX763A) o 0.2µA Shutdown Supply Current o 22µH Preselected Inductor Value; No Component Design Required o Overcurrent, Soft-Start, and Undervoltage Lockout Protection o Cycle-by-Cycle Current Limiting o 8-Pin DIP/SO Packages (MAX763A) _________________Ordering Information PART TEMP. RANGE PIN-PACKAGE MAX748ACPA 0°C to +70°C 8 Plastic DIP MAX748ACWE 0°C to +70°C 16 Wide SO MAX748AC/D 0°C to +70°C Dice* MAX748AEPA -40°C to +85°C 8 Plastic DIP MAX748AEWE -40°C to +85°C 16 Wide SO MAX748AMJA -55°C to +125°C 8 CERDIP 3.3V, Step-Down, Current-Mode PWM DC-DC Converters _______________________________________________________________________ Maxim Integrated Products 1 Call toll free 1-800-998-8800 for free samples or literature. 19-0190; Rev 0; 9/93 Ordering Information continued on last page. * Contact factory for dice specifications. ____________________Pin Configurations MAX748A INPUT 3.3V TO 16V V+ LX OUT CC GND SS REF SHDN ON/OFF 22 µH OUTPUT 3.3V 100 µF ____________Typical Operating Circuit TOP VIEW 1 2 3 4 8 7 6 5 V+ LX GND OUT CC SS REF MAX748A MAX763A DIP SHDN Pin Configurations continued on last page. |
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