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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LM3243 데이터시트(PDF) 1 Page - Texas Instruments |
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LM3243 데이터시트(HTML) 1 Page - Texas Instruments |
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1 / 32 page  LM3243 PVIN VDD SW FB VCON PGND SGND EN MODE VBATT VOUT ACB BP VCC_PA_2G BB or RFIC DAC GPO2 GPO1 BGND 1.5 µH 10 µF 1.0 µF PA 4.7 µF PA(s) VCC_PA_3G 10 µF Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3243 SNVS782C – OCTOBER 2010 – REVISED AUGUST 2015 LM3243 High-Current Step-Down Converter for 2G, 3G, and 4G RF Power Amplifiers 1 Features 3 Description The LM3243 is a DC-DC converter optimized for 1 • Input Voltage Range: 2.7 V to 5.5 V powering multi-mode 2G, 3G, and 4G RF power • High-Efficiency PFM and PWM Modes With amplifiers (PAs) from a single Lithium-Ion cell. The Internal Synchronous Rectification LM3243 steps down an input voltage from 2.7 V to • Analog Bypass Function with Low Dropout 5.5 V to a dynamically adjustable output voltage of 0.4 V to 3.6 V. The output voltage is set through a Resistance (45 m Ω Typical) VCON analog input that adjusts the output voltage to • Dynamically Adjustable Output Voltage: 0.4 V to ensure efficient operation at all power levels of the 3.6 V (Typical) in PFM and PWM Modes RF PA. • Maximum Load Current: 2.5 A in PWM Mode The LM3243 operates in constant frequency PWM • PWM Switching Frequency: 2.7 MHz (Average) mode producing a small and predictable amount of • Modulated Switching Frequency to Aid Rx Band output voltage ripple. This enables best ECTEL Compliance power requirements in GMSK and EDGE spectral compliance, with the minimal amount of filtering and • Operates From a Single Li-ion Cell excess headroom. When operating in PFM mode, the (2.7 V to 5.5 V) LM3243 enables the lowest DG09 current • Current and Thermal Overload Protection consumption and therefore maximizes system • ACB Reduces Inductor Requirements and Size efficiency. • Minimum Total Solution Size by Using Small The LM3243 has a unique Active Current assist and Footprint and Case Size Inductor and Capacitors analog Bypass (ACB) feature to minimize inductor size without any loss of output regulation for the 2 Applications entire battery voltage and RF output power range, until dropout. ACB provides a parallel current path, • Cellular Phones when needed, to limit the maximum inductor current • Hand-Held Radios to 1.4 A (typical) while still driving a 2.5-A load. The • RF PC Cards ACB also enables operation with minimal dropout voltage. When considering using the LM3243 in a • Battery-Powered RF Devices system design, see the Layout section of this data sheet. Device Information(1) PART NUMBER PACKAGE BODY SIZE (MAX) LM3243 DSBGA (16) 2.049 mm × 2.049 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Typical System Application Diagram 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. |
유사한 부품 번호 - LM3243_15 |
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유사한 설명 - LM3243_15 |
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