开关稳压器 Hi Current SD DC/DC Cnvtr
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 uniqueWhen 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.”
型号/品牌 | 代替类型 | 替代型号对比 |
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LM3253TME/NOPB TI 德州仪器 | 当前型号 | 当前型号 |
LM3253TMX/NOPB 德州仪器 | 完全替代 | LM3253TME/NOPB和LM3253TMX/NOPB的区别 |