LM3253 - 用于 2G/3G/4G 功率放大器的高电流降压 DC/DC 转换器

LM3253是TI德州仪器公司的一款转换器（集成开关）产品，LM3253是用于 2G/3G/4G 功率放大器的高电流降压 DC/DC 转换器，本站介绍了LM3253的封装应用图解、特点和优点、功能等，并给出了与LM3253相关的TI元器件型号供参考。

LM3253 - 用于 2G/3G/4G 功率放大器的高电流降压 DC/DC 转换器 - 转换器（集成开关） - DC/DC开关稳压器 - 德州仪器

产品描述

The LM3253 is a DC-DC converter optimized for powering multi-mode 2G/3G/4G RF power amplifiers (PAs) from a single Lithium-Ion cell. The LM3253 steps down an input voltage from 2.7V to 5.5V to a dynamically adjustable output voltage of 0.4V to 3.6V. 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 LM3253 is optimized for USB datacard applications.

The LM3253 operates in constant frequency Pulse Width Modulation (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 Pulse Frequency Modulation (PFM) mode, the LM3253 enables the lowest DG09 current consumption and therefore maximizes system efficiency.

The LM3253 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 1.84A (typ.) while still driving a 3A load. The ACB also enables operation with minimal dropout voltage. The LM3253 is available in a small 2 mm x 2 mm chip-scale 16-bump DSBGA package.

When considering the use of the LM3253 in a system design, contact the Texas Instruments Sales or Field Application engineer for a copy of the "LM3253: DC-DC Converter for 3G/4G RF PAs PCB Layout Considerations.”

产品特性

High-Efficiency PFM and PWM Modes with Internal Synchronous Rectification
Analog Bypass Function with Low Dropout Resistance (45 mΩ typ.)
Dynamically Adjustable Output Voltage, 0.4V to 3.6V (typ.), in PFM and PWM modes
3A Maximum Load Current in PWM Mode
2.7MHz (average) PWM Switching Frequency
Modulated Switching Frequency to Aid Rx Band Compliance
Operates From a Single Li-ion Cell (2.7V to 5.5V)
ACB Reduces Inductor Requirements and Size
Minimum Total Solution Size by Using Small Footprint and Case Size Inductor and Capacitors
16-bump Thin DSBGA Package
Current and Thermal Overload Protection

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