LM2674MX-ADJ/NOPB

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1. Describe

The LM2674MX-ADJ/NOPB series of regulators are monolithic integrated circuits built on the LMDMOS process. These regulators provide all the active features of a step-down (buck) switching regulator capable of driving 500mA 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 adjustable output versions. These regulators require a minimal number of external components, are simple to use, and include patented internal frequency compensation and fixed frequency oscillators. The LM2674MX-ADJ/NOPB family operates at a switching frequency of 260 kHz, thus allowing the use of smaller filter components than are required for low frequency switching regulators. Due to its very high efficiency (>90%), the copper traces on the printed circuit board are the only heat sinks needed. A standard family of inductors for use with the LM2674 is available from a number of different manufacturers. This feature greatly simplifies the design of switch-mode power supplies using these advanced ICs. Also included in the datasheet are diode and capacitor selection guides designed to Operates in switch mode power supplies.

2. Feature

    1. Efficiency up to 96%

    2. Available in 8-pin SOIC, PDIP and 16-pin WSON packages

    3. Simple and easy to use design

    4. Only 5 external components required

    5. Use off-the-shelf standard inductors

    6. 3V, 5V, 12V and adjustable output versions

    7. Adjustable version output voltage range: 1.21 V to 37 V

    8. Maximum output voltage tolerance at line and load conditions is ±1.5%

    9. Guaranteed 500mA output load current

  10. 0.25-Ω DMOS output switch

  11. Wide input voltage range: 8 V to 40 V

  12. 260kHz fixed frequency internal oscillator

  13. TTL shutdown capability, low power standby mode

  14. Thermal shutdown and current limit protection

3. Application

    1. Simple high efficiency (>90%) step-down (Buck) regulator

    2. High Efficiency Preregulators for Linear Regulators

    3. Positive and negative converter

4. Pin configuration

5. Pin Description