MAX730A

19-0165; Rev 2; 1/96 MAX730A/MAX738A/MAX744A 5V, Step-Down, Current-Mode PWM DC-DC Converters __________________General Description The MAX730A/MAX738A/MAX744A are 5V-output CMOS, step-down switching regulators. The MAX738A/ MAX744A accept inputs from 6V to 16V and deliver 750mA. The MAX744A guarantees 500mA load capability for inputs above 6V and has tighter oscillator frequency limits for low-noise (radio) applications. The MAX730A accepts inputs between 5.2V and 11V and delivers 450mA for inputs above 6V. Typical efficiencies are 85% to 96%. Quiescent supply current is 1.7mA and only 6µA 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. These regulators require only a single inductor value to work in most applications, so no inductor design is necessary. The MAX730A/MAX738A/MAX744A also feature cycleby-cycle current limiting, overcurrent limiting, undervoltage lockout, and programmable soft-start protection. ___________________________Applications Portable Instruments Cellular Phones and Radios Personal Communicators Distributed Power Systems Computer Peripherals __________Typical Operating Circuit ________________________________Features o 750mA Load Currents (MAX738A/MAX7...