The MAX748A/MAX763AESA are 3.3V-output CMOS, step-down switching regulators. The MAX748A accepts inputs from 3.3V to 16V and delivers up to 500mA. The MAX763AESA 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 provides 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 applications, so no magnetics design is necessary. The MAX748A/MAX763AESA also feature cycle-by-cycle current 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 MAX763AESA comes in 8-pin DIP and SO packages.
Feature
- Up to 500mA Load Currents
- Guaranteed 159kHz to 219.5kHz Current-Mode PWM
- 85% to 90% Efficiencies
- 1.7mA Quiescent Current (MAX748A)
- 1.4mA Quiescent Current (MAX763A)
- 0.2μA Shutdown Supply Current
- 22μH Preselected Inductor Value; No Component Design Required
- Overcurrent, Soft-Start, and Undervoltage Lockout Protection
- Cycle-by-Cycle Current Limiting
- 8-Pin DIP/SO Packages (MAX763A)
Applications
- 5V to 3.3V Conversion
- Cell Phones
- Computer Peripherals
- Handheld Computers
- Portable Instrumentation
