Power Management Switching Regulator Step-Down (Buck) Regulators Internal Power Switch Buck

For New Designs

LT1949 - 600kHz, 1A Switch PWM DC/DC Converter

LT1949-1 - 1.1MHz, 1A Switch PWM DC/DC Converter

Features

  • OBSOLETE PRODUCT:Data Sheet For Reference Only. Contact Linear Technology for Potential Replacement.
  • 1A, 0.5 Ohms, 30V Internal Switch
  • 1.1MHz Fixed Frequency Operation
  • Operates with VIN as Low as 1.5V
  • Low-Battery Detector Stays Active in Shutdown
  • Low VCESAT Switch: 410mV at 800mA
  • Pin-for-Pin Compatible with the LT1317B
  • Uses Ceramic Capacitors
  • Small 8-Lead MSOP Package

Typical Application

LT1949-1 Typical Application
LT1949-1 Typical Application

Description

The LT1949-1 is a fixed frequency step-up DC/DC converter with a 1A, 0.5 Ohms internal switch. Capable of generating 10V at 175mA from a 3.3V input, the LT1949-1 is ideal for generating bias voltages for large screen LCD panels. Constant frequency 1.1MHz operation results in a low noise output that is easy to filter and the 30V switch rating allows output voltage up to 28V using a single inductor. The high switching frequency allows the use of ceramic output capacitors. An external compensation pin gives the user flexibility in optimizing loop compensation, allowing small, low ESR ceramic capacitors to be used at the output. The 8-lead MSOP package ensures a low profile overall solution. The LT1949-1 includes a low-battery detector that stays alive when the device goes into shutdown. Quiescent current in shutdown is 50µA, while operating current is 8mA.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

LT1949-1 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • LCD Bias Supplies
  • GPS Receivers
  • Battery Backup
  • Portable Electronic Equipment
  • Diagnostic Medical Instrumentation

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice:
LT1949
LT1949-1

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