Datenblatt-Suchmaschine für elektronische Bauteile |
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SD3118-2R2 Datenblatt(PDF) 11 Page - Skyworks Solutions Inc. |
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SD3118-2R2 Datenblatt(HTML) 11 Page - Skyworks Solutions Inc. |
11 / 22 page 11 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201999B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • March 20, 2013 AAT1171 600mA Voltage-Scaling Step-Down Converter for RF Power Amplifiers with Bypass Switch DATA SHEET Functional Description The AAT1171 is a 600mA 2MHz peak current mode syn- chronous step-down (buck) converter designed to oper- ate from a single-cell lithium-ion battery with a 2.7V to 4.2V input range. The output voltage is dynamically programmed by the DAC input voltage. To maximize converter efficiency over all load conditions, the converter automatically transitions to a variable fre- quency light load (LL) mode when the load is less than 100mA. When combined with the very low quiescent current, the LL mode maintains a high efficiency over the complete load range. For noise sensitive applications, the converter can be forced into a fixed frequency PWM mode. Provisions are also made for synchronization of the converter to an external system clock. The synchronous buck converter power output devices are sized at 230mΩ for a 600mA full load output current. In addition to the converter output, an additional low resistance bypass MOSFET (85mΩ) can be connected between the battery input and the converter output (VIN to VOUT), bypassing the converter and output inductor to improve headroom and extend the WCDMA PA full power range. This reduces the battery voltage necessary for a WCDMA RF power amplifier to meet linearity require- ments, thus extending operating time. In dual mode systems, the bypass mode may also be used when the WCDMA RF power amplifier is in GSM mode. Bypass mode is activated by setting the bypass input high or by forcing the baseband DAC output voltage to 1.3V. The AAT1171 requires only three external components for operation (CIN, COUT, LX). The high 2MHz switching frequency reduces the inductor size required to 2.2μH for the AAT1171-1/AAT1171-4 and 4.7μH for the AAT1171-5. This reduces the DC resistance and improves the converter efficiency while minimizing the inductor Functional Block Diagram Logic DH DL Comp Error Amp VOUT VCC VIN LX AGND PGND DAC EN BYPASS MODE/SYNC MODE/SYNC Interface |
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Ähnliche Beschreibung - SD3118-2R2 |
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