LT3494 - Micropower Low Noise Boost Converters with Output Disconnect

Features

  • Low Quiescent Current
      65µA in Active Mode
      1µA in Shutdown Mode
  • Switching Frequency is Non-Audible Over Entire Load Range
  • Integrated Power NPN:
      350mA Current Limit (LT3494A)
      180mA Current Limit (LT3494)
  • Integrated Schottky Diode
  • Integrated Output Disconnect
  • Integrated Output Dimming
  • Wide Input Range: 2.3V to 16V
  • Wide Output Range: Up to 40V
  • Tiny 8-Lead 3mm x 2mm DFN Package

Typical Application

LT3494 Typical Application
LT3494 Typical Application
LT3494 Typical Application

Description

The LT3494/LT3494A are low noise boost converters with integrated power switch, Schottky diode and output disconnect circuitry. The parts use a novel* control technique resulting in low output voltage ripple as well as high efficiency over a wide load current range. This technique guarantees that the switching frequency stays above the audio band for the entire load range. The parts feature a high performance NPN power switch with a 350mA and 180mA current limit for the LT3494A and LT3494 respectively. The quiescent current is a low 65µA, which is further reduced to less than 1µA in shutdown. The internal disconnect circuitry allows the output voltage to be isolated from the input during shutdown. An auxiliary reference input (CTRL pin) overrides the internal 1.225V feedback reference with any lower value allowing full control of the output voltage during operation. The LT3494/LT3494A are available in a tiny 8-lead 3mm x 2mm DFN package.

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
LT3494AEDDB#PBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LT3494AEDDB#TRMPBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LT3494AEDDB#TRPBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LT3494EDDB#PBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LT3494EDDB#TRMPBF 3x2 DFN-8 DDB E 05-08-1702 Yes
LT3494EDDB#TRPBF 3x2 DFN-8 DDB E 05-08-1702 Yes


LT3494 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
LT3494AEDDB#PBF 3x2 DFN-8 E $2.07 Yes
LT3494AEDDB#TRMPBF 3x2 DFN-8 E $2.07 $1.50 Yes
LT3494AEDDB#TRPBF 3x2 DFN-8 E $2.07 $1.45 Yes
LT3494EDDB#PBF 3x2 DFN-8 E $2.07 Yes
LT3494EDDB#TRMPBF 3x2 DFN-8 E $2.07 $1.50 Yes
LT3494EDDB#TRPBF 3x2 DFN-8 E $2.07 $1.45 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
DC1024A-A LT3494EDDB Demo Board | 3V-4.2Vin, 15Vout @ 32mA $75.00
DC1024A-B LT3494AEDDB Demo Board | 3V-4.2Vin, 15Vout @ 44mA $75.00
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Click here to view our complete list of demo boards

Applications

  • OLED Power
  • Low Noise Power
  • MP3 Players

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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

To launch a ready to run LTspice demonstration circuit for this part:

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice:
LT3494
LT3494A

Technical Support