Maxim Integrated MAX748ACWE

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 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/MAX763A also feature cycle-by-cycle current limiting, overcurrent limiting, undervoltage lockout, and programmable soft-start protection.

Features
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-10-3.3V Converters
Cellular Phones
Portable Instruments
Hand-Held Computers
Computer Peripherals