LM2671MX-ADJ/NOPB

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1. Description

The LM2671MX-ADJ/NOPB series of regulators are monolithic integrated circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down (buck) switching regulator, capable of driving a 500-mA load current with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5 V, 12 V, and an adjustable output version. Requiring a minimum number of external components, these regulators are simple to use and include patented internal frequency compensation, fixed frequency oscillator, external shutdown, soft start, and frequency synchronization. The LM2671MX-ADJ/NOPB series operates at a switching frequency of 260 kHz, thus allowing smaller sized filter components than what is required with lower frequency switching regulators. Because of its very high efficiency (> 90%), the copper traces on the printed-circuit board are the only heat sinking required. A family of standard inductors for use with the LM2671MX-ADJ/NOPB are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies using these advanced ICs. Also included in the data sheet are selector guides for diodes and capacitors designed to work in switch-mode power supplies.

2. Features

    1. Efficiency up to 96%

    2. Available in 8-Pin SOIC, PDIP, and WSON Packages

    3. Simple and Easy to Design With

    4. Requires Only 5 External Components

    5. Uses Readily Available Standard Inductors

    6. 3.3-V, 5-V, 12-V, and Adjustable Output Versions

    7. Adjustable Version Output Voltage Range: 1.21 V to 37 V

    8. ±1.5% Maximum Output Voltage Tolerance Over Line and Load Conditions

    9. Ensured 500-mA Output Load Current

  10. 0.25-Ω DMOS Output Switch

  11. Wide Input Voltage Range: 8 V to 40 V

  12. 260-kHz Fixed Frequency Internal Oscillator

  13. TTL Shutdown Capability, Low Power Standby Mode

  14. Soft-Start and Frequency Synchronization

  15. Thermal Shutdown and Current-Limit Protection

3. Applications

    1. Simple High Efficiency (> 90%) Step-Down (Buck) Regulators

    2. Efficient Preregulator for Linear Regulators