LTC3458L - 1.7A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect

Features

  • High Efficiency: Up to 95%
  • Inrush Current Limiting and Output Disconnect
  • Programmable Output Voltages up to 6V
  • 1.5V to 6V Input Range
  • Programmable/Synchronizable Fixed Frequency Operation up to 1.5MHz
  • Programmable Automatic Burst Mode® Operation
  • Current Mode Control with Programmable Soft-Start Period and Peak Current Limit
  • 0.2 Ohm N-Channel and 0.3 Ohm P-Channel Switches
  • Ultralow Quiescent Currents: 12µA Sleep, <1µA in Shutdown
  • 12-Pin 4mm × 3mm Thermally Enhanced DFN Package

Typical Application

LTC3458L Typical Application
LTC3458L Typical Application

Description

The LTC3458L is a high efficiency, current mode, fixed frequency, step up DC/DC converter with true output disconnect and inrush current limiting. The LTC3458L is rated for up to 6V output and includes a 0.2 Ohm N-channel MOSFET switch and a 0.3 Ohm P-channel MOSFET synchronous rectifier. The LTC3458L is well suited for battery powered applications and includes programmable output voltage, switching frequency and loop compensation. The oscillator frequency can be set up to 1.5MHz or synchronized to an external clock.

Quiescent current is only 12µA during Burst Mode operation maximizing battery life in portable applications. The Burst Mode current threshold, peak current limit, and softstart are externally programmable. Other features include <1µA shutdown current, antiringing control, and thermal limit. The LTC3458L is available in a low profile (0.75mm), 4mm × 3mm 12-pin DFN package.

Protected by U.S. Patents including 5481178, 6304066, 6580258, 5511131, 6498466

  Vout Range Switch Current
LTC3458 2.0V to 7.5V 1.4A
LTC3458L 2.0V to 6.0V 1.7A

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
LTC3458LEDE#PBF 4x3 DFN-12 DE/UE E 05-08-1695 Yes
LTC3458LEDE#TRPBF 4x3 DFN-12 DE/UE E 05-08-1695 Yes


LTC3458L 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
LTC3458LEDE#PBF 4x3 DFN-12 E $3.93 $3.30 Yes
LTC3458LEDE#TRPBF 4x3 DFN-12 E $3.40 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
DC878A LTC3458LEDE Demo Board | 2V ≤ VIN ≤ 5V, Vout = 5V @ 300mA - 900mA $100.00
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Click here to view our complete list of demo boards

Applications

  • Point-of-Load Regulators
  • USB VBUS Power
  • Portable GPS
  • MP3 Players

Product Notifications

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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:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

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

Models for the following parts are available in LTspice:
LTC3458
LTC3458L

Technical Support