MAX1820 Datasheet | Maxim Integrated

Features o Dynamically Adjustable Output from 0.4V to 3.4V (MAX1820) o Programmable Output from 1.25V to 5.5V (MAX1821) o SYNC to 13MHz External Clock (MAX1820X) o SYNC to 19.8MHz External Clock (MAX1820Y) o NO SYNC, Internal 1MHz Oscillator (MAX1820Z) o Low Quiescent Current 180µA (typ) in Skip Mode 0.1µA (typ) in Shutdown Mode o No External Schottky Diode Required o 600m A Guaranteed Output Current o 0% to 100% Duty-Cycle Operation o 150m V Dropout at 600m A Load (Including RDC of External Inductor) o µMAX or UCSP Packaging General Description The MAX1820/MAX1821 low-dropout, pulse-width-modulated (PWM) DC-DC buck regulators are optimized to provide power to the power amplifier (PA) in WCDMA cell phones; however, they may be applied in many other applications where high efficiency is a priority. The supply voltage range is from 2.6V to 5.5V, and the guaranteed output current is 600m A; 1MHz PWM switching allows for small external ponents, while skip mode reduces quiescent current to 180µA with light loads. The MAX1820 is dynamically controlled to provide varying output voltages from 0.4V to 3.4V. The circuit is designed such that the output voltage settles in <30µs for a full-scale change in voltage and current. The MAX1821 is set with external resistors to provide any fixed output voltage in the 1.25V to 5.5V range. The MAX1820/MAX1821 include a low on-resistance internal MOSFET switch and synchronous rectifier to maximize efficiency and minimize external ponent count; 100% duty-cycle operation allows for low dropout of only 150m V at 600m A load, including the external inductor resistance. The devices are offered in 10-pin µMAX and tiny 3 ✕ 4 chip-scale (UCSP™) packages. MAX1820/MAX1821 ________________________Applications WCDMA Cell Phone Power Amplifiers PDA, Palmtop, and Notebook puters Microprocessor Core Supplies Digital Cameras PCMCIA and Network Cards Hand-Held Instruments Typical Operating Circuits continued at end of data sheet. Ordering Information...