Power Management Switching Regulator SEPIC Regulators
Power Management Switching Regulator Step-Up (Boost) Regulators Internal Power Switch Boost

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

Features

  • 1.1A, 0.5Ω, 30V Internal Switch
  • Operates with VIN as Low as 1.5V
  • 600kHz Fixed Frequency Operation
  • Low-Battery Detector Active in Shutdown
  • Low VCESAT Switch: 410mV at 800mA
  • Pin-for-Pin Compatible with the LT1317B
  • Small 8-Lead MSOP Package and SO Packages

Typical Application

LT1949 Typical Application
LT1949 Typical Application

Description

The LT1949 is a fixed frequency step-up DC/DC converter with a 1A, 0.5Ω internal switch. Capable of generating 10V at 175mA from a 3.3V input, the LT1949 is ideal for generating bias voltages for large screen LCD panels. Constant frequency 600kHz 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. 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 and SO packages ensure a low profile overall solution.

The LT1949 includes a low-battery detector that stays alive when the device goes into shutdown. Quiescent current in shutdown is 25µA, while operating current is 4.5mA.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

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

Part Number Package Code Temp Package
Drawing		 RoHS
LT1949EMS8#PBF MS-8 MS8 E 05-08-1660 Yes
LT1949EMS8#TRPBF MS-8 MS8 E 05-08-1660 Yes
LT1949ES8#PBF SO-8 S8 E 05-08-1610 (S8) Yes
LT1949ES8#TRPBF SO-8 S8 E 05-08-1610 (S8) Yes
LT1949IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1949IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LT1949 Package Drawing
LT1949 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

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LT1949EMS8#PBF MS-8 E $2.66 $2.25 Yes
LT1949EMS8#TRPBF MS-8 E $2.31 Yes
LT1949ES8#PBF SO-8 E $2.60 $2.20 Yes
LT1949ES8#TRPBF SO-8 E $2.26 Yes
LT1949IS8#PBF SO-8 I $2.95 $2.50 Yes
LT1949IS8#TRPBF SO-8 I $2.56 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

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

Technical Support