LMV248LQ RF/IF and RFID

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The LMV248LQ, part of Texas Instruments’ wide range of RF Power Controller ICs, is a highly efficient and accurate step-down DC/DC switching regulator. This sophisticated integrated circuit (IC) can act as a low-side switch, enabling both low-side and high-side switching operations. Designed for always-on, low-power mobile applications requiring ultra-low shutdown power, the LMV248LQ is suitable for applications such as RF switch and power management in cellular/mobile systems and base stations.

The LMV248LQ offers a wide input supply voltage range of 2.95V to 5.5V. It employs adaptive switching techniques to minimize the power consumption and the EMI inherent in switch-mode circuits. Built-in features such as thermal shutdown and Current Limit Sense frequency spread spectrum modulator maintain robust operation under all conditions. Support for both PWM and PFM (pulse-frequency modulation) control provides designers the flexibility needed to further optimize their work. In addition, the device includes an internal power-on-reset, which ensures proper power-up sequencing.

The goal of the LMV248LQ is to maintain high efficiency and accuracy at low current levels, while at the same time reducing switching noise. Key among the features enabling this are its Adaptive On-Time Control (AOTC) and integrated compensation loop. Together, these allow it to sense the load current accurately and response accordingly to it.

Additionally, the LMV248LQ incorporates a dual channel drive, which reduces switching transition time significantly. The main idea is to alternate between active/inactive output stages. This reduces shoot-through currents and hence reduces EMI. It also reduces energy loss and improves overall efficiency.

The LMV248LQ chip is also optimized for 24V systems, and it offers 2A peak current for output drive, making it ideal for systems prone to vibration or over-voltage conditions. It uses a low-side reference to control output voltage and can reach a switching frequency of 1.2MHz. LMV248LQ also has an advanced self-biasing and adaptive circuitry that allows it to deliver high accuracy and tight regulation over temperature.

Overall, the LMV248LQ is an ideal RF power controller ICs for applications such as digital power supplies for mobile equipment, automotive RF switch applications, multifunctional base station systems and low-side switching circuits. With its high efficiency, accuracy and robust operating capabilities, it provides an excellent choice for designers looking for an optimized low-power solution.

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