LM2675MX-ADJ/NOPB

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1. Description

The LM2675MX-ADJ/NOPB series of regulators are monolithic integrated DC-DC converter circuits built with a LMDMOS process. These regulators provide all the active functions for a step-down (buck) switching regulator, capable of driving a 1-A 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 and a fixed frequency oscillator. The LM2675MX-ADJ/NOPB series operates at a switching frequency of 260 kHz, thus allowing smaller-sized filter components than what would be needed 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 needed.

2. Features

    1. Efficiency up to 96%

    2. Available in 8-Pin SOIC, PDIP, and 16-Pin WSON Package

    3. Requires only 5 External Components

    4. 3.3-V, 5-V, 12-V, and Adjustable Output Versions

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

    6. ±1.5% Maximum Output Voltage Tolerance Over Line and Load Conditions

    7. Ensured 1-A Output Load Current

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

    9. 260-kHz Fixed Frequency Internal Oscillator

  10. TTL Shutdown Capability, Low-Power Standby Mode

  11. Thermal Shutdown and Current Limit Protection

3. Applications

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

    2. Efficient Preregulator for Linear Regulators

    3. Positive-to-Negative Converter