REG1117

Description

The REG1117 is a family of easy-to-use three-terminal voltage regulators. The family includes a variety of fixed and adjustable-voltage versions, two currents (800mA and 1A) and two package types (SOT-223 and DDPAK). Output voltage of the adjustable versions is set with two external resistors. The REG1117 low dropout voltage allows its use with as little as 1V input-output voltage differential.
Laser trimming assures excellent output voltage accuracy without adjustment. An NPN output stage allows output stage drive to contribute to the load current for maximum
efficiency.

Features:

• Fixed and Adjustable versions
• 2.85V model for SCSI-2 active Termination
• Output Current:
  REG1117: 800mA max
  REG1117A: 1A max
• Output Tolerance:  1% max
• Dropout Voltage:
  REG1117: 1.2V max at IO = 800mA
  REG1117A: 1.3V max at IO = 1A
• Internal Current limit
• Thermal overload Protection
• SOT-223 and DDPAK Surface-mount packages

Applications:

• SCSI-2 Active Termination
• Hand-Held Data collection devices
• High Efficiency Linear Regulators
• Battery-Powered Instrumentation
• Battery Management Circuits for Notebook and PALMTOP PCs
• Core Voltage Supply: FPGA, PLD, DSP, CPU

Pinout Connection

Download Datasheet REG1117

LM2576

Description

The LM2576 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 3A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation and a fixed frequency oscillator.

The LM2576 series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially reduces the size of the heat sink, and in some cases no heat sink is required. A standard series of inductors optimized for use with the LM2576 are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies. Other features include a specified ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50μA (typical) standby current. The output switch includes cycle-by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions.

Blok Diagram

Download Datasheet LM2576