LM3208TLX

Special Purpose Regulators Overview

The LM3208TLX is a miniature, adjustable step-down DC-DC converter designed for RF power amplifier applications. It operates from a single Lithium-Ion cell with an input voltage range of 3.25V to 5.5V and delivers up to 650mA maximum load current. The device utilizes internal synchronous rectification to achieve high efficiency, typically 96% at 3.6V input and 400mA load. It features a fixed 2 MHz PWM switching frequency, which minimizes RF interference and allows the use of tiny surface-mount components. Only three external components are required: one inductor and two ceramic capacitors.

Special Purpose Regulators Feature Summary

• Adjustable output voltage capability optimized for RF power amplifiers
• Internal synchronous rectification ensures high conversion efficiency
• Fixed 2 MHz switching frequency reduces electromagnetic interference
• Integrated current and thermal overload protection mechanisms

Special Purpose Regulators Applications

• RF power amplifier biasing
• Portable devices powered by single Li-Ion cells
• Low dropout voltage requirements in mobile phones

Special Purpose Regulators Procurement Notes

Verify the specific suffix TLX indicates tape and reel packaging when ordering. Confirm the manufacturer origin as National Semiconductor or Texas Instruments, noting that TI acquired NSC. Ensure the component matches the 8-pin micro SMD package specification. Cross-reference the datasheet version to confirm compatibility with current supply chain standards.

Special Purpose Regulators Selection Notes

Select this component when an adjustable output voltage is required for RF PA applications rather than the fixed 3.09V variant found in the LM3206. Consider the 2 MHz switching frequency for minimizing external component size and RF noise. Evaluate the 650mA current limit against peak load demands. Verify input voltage ranges align with single-cell lithium-ion battery discharge curves.

Special Purpose Regulators Part Context

The LM3208 belongs to the LM320x family of miniature step-down converters. Unlike the LM3206 which provides a fixed 3.09V output, the LM3208 offers adjustable output settings. Both share similar package types and switching frequencies but differ in output configuration. This series targets portable electronics requiring efficient power management from single-cell sources.

Special Purpose Regulators Replacement Considerations

LM3208TL/NOPB and LM3208TLX/NOPB are direct equivalents with lead-free specifications. Check for updated datasheets from Texas Instruments following the acquisition of National Semiconductor.