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LM3243-用于 2G/3G/4G PA 的 LM3243 高电流降压转换器产品简介
LM3243-转换器（集成开关）-DC/DC开关稳压器-电源管理
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TI产品 - LM3243介绍

LM3243 - 用于 2G/3G/4G PA 的 LM3243 高电流降压转换器产品简介

LM3243是TI德州仪器公司的一款转换器（集成开关）产品，LM3243是用于 2G/3G/4G PA 的 LM3243 高电流降压转换器产品简介，本站介绍了LM3243的封装应用图解、特点和优点、功能等，并给出了与LM3243相关的TI元器件型号供参考。

LM3243 - 用于 2G/3G/4G PA 的 LM3243 高电流降压转换器产品简介 - 转换器（集成开关） - DC/DC开关稳压器 - 德州仪器

产品特性
  • Input Voltage Range: 2.7 V to 5.5 V
  • High-Efficiency PFM and PWM Modes With Internal Synchronous Rectification
  • Analog Bypass Function with Low Dropout Resistance (45 mΩ Typical)
  • Dynamically Adjustable Output Voltage: 0.4 V to 3.6 V (Typical) in PFM and PWM Modes
  • Maximum Load Current: 2.5 A in PWM Mode
  • PWM Switching Frequency: 2.7 MHz (Average)
  • Modulated Switching Frequency to Aid Rx Band Compliance
  • Operates From a Single Li-ion Cell (2.7 V to 5.5 V)
  • Current and Thermal Overload Protection
  • ACB Reduces Inductor Requirements and Size
  • Minimum Total Solution Size by Using Small Footprint and Case Size Inductor and Capacitors
产品应用
  • Cellular Phones
  • Hand-Held Radios
  • RF PC Cards
  • Battery-Powered RF Devices
产品说明

The LM3243 is a DC-DC converter optimized for powering multi-mode 2G, 3G, and 4G RF power amplifiers (PAs) from a single Lithium-Ion cell. The LM3243 steps down an input voltage from 2.7 V to 5.5 V to a dynamically adjustable output voltage of 0.4 V to 3.6 V. The output voltage is set through a VCON analog input that adjusts the output voltage to ensure efficient operation at all power levels of the RF PA.

The LM3243 operates in constant frequency PWM mode producing a small and predictable amount of output voltage ripple. This enables best ECTEL power requirements in GMSK and EDGE spectral compliance, with the minimal amount of filtering and excess headroom. When operating in PFM mode, the LM3243 enables the lowest DG09 current consumption and therefore maximizes system efficiency.

The LM3243 has a unique Active Current assist and analog Bypass (ACB) feature to minimize inductor size without any loss of output regulation for the entire battery voltage and RF output power range, until dropout. ACB provides a parallel current path, when needed, to limit the maximum inductor current to 1.4 A (typical) while still driving a 2.5-A load. The ACB also enables operation with minimal dropout voltage. When considering using the LM3243 in a system design, see the Layout section of this data sheet.

产品器件信息
PART NUMBERPACKAGEBODY SIZE (MAX)
LM3243DSBGA (16)2.049 mm × 2.049 mm
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