MAX77271
Multimode PA Step-Down Converter with Linear Bypass Mode
General Description
The MAX77271 step-down converter is optimized for powering the power amplifier (PA) in multistandard handsets such as LTE, WCDMA, TD-SCDMA, GSM, and EDGE.
The device integrates a high-efficiency PWM stepdown converter for medium- and low-power transmission with an 85mΩ (typ) low dropout (LDO) bypass
regulator, in parallel with the step-down converter, enabling highpower transmission.
The IC uses an analog input driven by an external DAC to control the output voltage linearly for continuous PA power adjustment.
The bypass LDO powers the PA directly from the battery during high-power transmission or in case...