LM2678 Datasheet | Texas Instruments

Features - 1 Efficiency Up to 92% - Simple and Easy to Design Using Off-the-Shelf External ponents - 120-mΩ DMOS Output Switch - 3.3-V, 5-V, and 12-V Fixed Output and Adjustable (1.2 V to 37 V) Versions - 50-μA Standby Current When Switched OFF - ±2% Maximum Output Tolerance Over Full Line and Load Conditions - Wide Input Voltage Range: 8 V to 40 V - 260-k Hz Fixed Frequency Internal Oscillator - - 40 to 125°C Operating Junction Temperature Range - Create a Custom Design Using the LM2678 With the WEBENCH® Power Designer 2 Applications - Simple-to-Design, High Efficiency (>90%) Step Down Switching Regulators - Efficient System Preregulator for Linear Voltage Regulators - Battery Chargers 3 Description The LM2678 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 5-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 plete design using a minimum number of external ponents. A high fixed frequency oscillator (260 k Hz) allows the use of physically smaller sized ponents. A family of standard inductors for use with the LM2678 are available from several manufacturers to greatly simplify the design process. The LM2678 series also has built-in thermal shutdown, current limiting, and an ON/OFF control input that can power down the regulator to a low 50μA quiescent current standby condition. The output voltage is ensured to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) TO-263 (7) 10.10 mm × 8.89 mm TO-220 (7) 14.986 mm × 10.16 mm VSON (14) 6.00 mm × 5.00 mm (1) For all available packages, see the orderable...