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AS1339
6 5 0 m A R F St e p - D o w n D C - D C f o r PA, w i t h t w o L D O s
D a ta s h e e t
1 General Description
The AS1339 is a high-frequency step-down converter optimized for dynamically powering the power amplifier (PA) in WCDMA or NCDMA handsets.
The device uses a 110mΩ typical bypass FET to power the PA directly from the battery during high-power transmission.
The IC integrates two 10mA low-noise, low-dropout
regulators (LDOs) for PA biasing.
With a switching frequency of 2MHz, the device allows optimization for smallest solution size or highest efficiency.
The AS1339 supports fast switching using small ceramic 10μF input and 4.
7µF output capacitors to main...