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AS1339 - 650mA RF Step-Down DC-DC

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.

Features

  • ! ! ! ! ! ! Fixed Switching Frequency: 2MHz PA Step-Down Converter Low Dropout Voltage Low Output-Voltage Ripple Dynamic Output Voltage Control (0.8V to 3.75V) 30µs Settling Time for 0.8V to 3.4V Output Voltage Change 650mA Output Drive Capability Two 10mA Low-Noise LDOs Low Shutdown Current Supply Voltage Range: 2.7V to 5.5V Thermal Shutdown 16-pin WLP (2x2mm) package ! ! ! ! ! ! 3.

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Datasheet preview – AS1339

Datasheet Details

Part number AS1339
Manufacturer austriamicrosystems AG
File Size 3.98 MB
Description 650mA RF Step-Down DC-DC
Datasheet download datasheet AS1339 Datasheet
Additional preview pages of the AS1339 datasheet.

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Full PDF Text Transcription

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www.DataSheet4U.com 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 maintain low ripple voltage.
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