Datasheet Summary
19-0777; Rev 0; 4/07
600mA PWM Step-Down Converters in 2mm x 2mm WLP for WCDMA PA Power
General Description
The MAX8805Y/MAX8805Z high-frequency step-down converters are optimized for dynamically powering the power amplifier (PA) in WCDMA or NCDMA handsets. The devices integrate a high-efficiency PWM step-down converter for medium- and low-power transmission, and a 60mΩ typical bypass FET to power the PA directly from the battery during high-power transmission. Dual 200mA low-noise, high-PSRR low-dropout regulators (LDOs) for PA biasing are also integrated. Two switching frequency options are available- 2MHz (MAX8805Y) and 4MHz (MAX8805Z)- allowing optimization for smallest solution size or...