The LM2676SX-ADJ/NOPB 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 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 (260kHz) allows the use of physically smaller sized components. A family of standard inductors for use with the LM2676SX-ADJ/NOPB are available from several manufacturers to greatly simplify the design process.
The LM2676SX-ADJ/NOPB 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.
Feature
Efficiency Up to 94%
Simple and Easy to Design With (Using Off-the- Shelf External Components)
150-mΩ DMOS Output Switch
3.3-V, 5-V, 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
Description
The LM2676 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 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 (260kHz) 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.
(Picture: Diagram)
Catalogue
FPGA / CPLD
Memory
MOS 
MCU 
DSP
OCEP
Secondary 
Other 
