LM2676S-ADJ

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1. Description

The LM2676S-ADJ series of regulators are monolithic integrated circuits which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 3-A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ONresistance DMOS power switch. The series consists of fixed output voltages of 3.3-V, 5-V, and 12-V and an adjustable output version. The SIMPLE SWITCHER® concept provides for a complete design using a minimum number of external components. A high fixed frequency oscillator (260 kHz) allows the use of physically smaller sized components. A family of standard inductors for use with the LM2676 are available from several manufacturers to greatly simplify the design process. The LM2676 series also has built-in thermal shutdown, current limiting and an ON/OFF control input that can power down the regulator to a low 50‑µA quiescent current standby condition. The output voltage is ensured to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance. The new product, LMR33630, offers reduced BOM cost, higher efficiency, and an 85% reduction in solution size among many other features. See the Device Comparison Table to compare specs. Start a WEBENCH Design with LMR33630.

2. Features

    1. New product available: LMR33630 36-V, 3-A, 400-kHz synchronous converter

    2. Efficiency up to 94%

    3. Simple and easy to design with (using off-the-shelf external components)

    4. 150-mΩ DMOS output switch

    5. 3.3-V, 5-V, 12-V Fixed output and adjustable (1.2 V to 37 V) versions

    6. 50-µA Standby current when switched OFF

    7. ±2% Maximum output tolerance over full line and load conditions

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

    9. 260-KHz Fixed frequency internal oscillator

  10. –40 to 125°C Operating junction temperature range

3. Applications

    1. Communication module

    2. Electricity meter

    3. Calling button operating panel

    4. Motor drives

4. Pin Configuration 

5. Pin Functions