Power Management Switching Regulator LCD/CCD/OLED Bias
Power Management Switching Regulator Step-Up (Boost) Regulators Internal Power Switch Boost

LT1946 - 1.2MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start

Features

  • 1.5A, 36V Internal Switch
  • 1.2MHz Switching Frequency
  • Integrated Soft-Start Function
  • Output Voltage Up to 34V
  • Low VCESAT Switch: 300mV at 1.5A (Typ)
  • 8V at 430mA from a 3.3V Input
  • Small 8-Lead MSOP Package

Typical Application

LT1946 Typical Application
LT1946 Typical Application

Description

The LT1946 is a fixed frequency step-up DC/DC converter containing an internal 1.5A, 36V switch. Capable of generating 8V at 430mA from a 3.3V input, the LT1946 is ideal for large TFT-LCD panel power supplies. The LT1946 switches at 1.2MHz, allowing the use of tiny, low profile inductors and low value ceramic capacitors. Loop compensation can be either internal or external, giving the user flexibility in setting loop compensation and allowing optimized transient response with low ESR ceramic output capacitors. Soft-start is controlled with an external capacitor, which determines the input current ramp rate during start-up.

The 8-lead MSOP package and high switching frequency ensure a low profile overall solution less than 1.2mm high.

  Switching Frequency
LT1946 1.2MHz
LT1946A 2.7MHz

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
LT1946EMS8#PBF MS-8 MS8 E 05-08-1660 Yes
LT1946EMS8#TRPBF MS-8 MS8 E 05-08-1660 Yes
LT1946EMS8E#PBF MS-8 MS8 E 05-08-1660 Yes
LT1946EMS8E#TRPBF MS-8 MS8 E 05-08-1660 Yes


LT1946 Package Drawing
LT1946 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
LT1946EMS8#PBF MS-8 E $2.08 $1.75 Yes
LT1946EMS8#TRPBF MS-8 E $1.81 Yes
LT1946EMS8E#PBF MS-8 E $2.14 $1.80 Yes
LT1946EMS8E#TRPBF MS-8 E $1.86 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.

Part Number Description Price Documentation
DC459A LT1946EMS8 LT1946AEMS8E | 12Vout Boost Converter, +5Vin, +12Vout/400mA and Triple Output TFT LCD Bias Supply, 3.3Vin, Vout=+23V/5mA, +8V/350mA, -8V/10mA Contact Factory
Buy Now
Click here to view our complete list of demo boards

Applications

  • TFT-LCD Bias Supplies
  • GPS Receivers
  • DSL Modems
  • Local Power Supplies

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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:
LT1946
LT1946A

Technical Support