TI LM2678S-5.0/NOPB

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 ON - resistance 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 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 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.

• Efficiency Up to 92%
• Simple and Easy to Design Using Off - the - Shelf External Components
• 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 - kHz Fixed Frequency Internal Oscillator
• • 40 to 125 °C Operating Junction Temperature Range
• Create a Custom Design Using the LM2678 With the WEBENCH Power Designer

• Simple - to - Design, High Efficiency (>90%) Step - Down Switching Regulators
• Efficient System Preregulator for Linear Voltage Regulators
• Battery Chargers