LT1308 - Single Cell High Current Micropower 600kHz Boost DC/DC Converter

Features

  • 5V at 1A from a Single Li-Ion Cell
  • 3.3V at 300mA from a Single NiCd Cell
  • Low Quiescent Current: 100µA
  • Operates with VIN as Low as 1V
  • Fixed Frequency Operation: 600kHz
  • Current Mode PWM Delivers Low Output Ripple
  • Guaranteed Start-Up into Full Load
  • Low Shutdown Current: 3µA
  • Low-Battery Comparator
  • Automatic Burst Mode’ Operation at Light Load
  • Low VCESAT Switch: 300mV at 2A

Typical Application

LT1308 Typical Application
LT1308 Typical Application

Description

The LT1308 is a micropower, fixed frequency boost DC/DC converter that operates from an input voltage as low as 1V. Capable of delivering 5V at load current of 1A from a single Li-Ion cell, the LT1308 also features power saving Burst Mode operation at light loads. High efficiency is maintained over a broad 1mA to 1A load range.

The device contains a low-battery detector with a 200mV reference and shuts down to less than 5µA quiescent current. No-load quiescent current is 100µA and the internal NPN power switch handles a 2A current with a voltage drop of just 300mV.

High frequency 600kHz switching allows the use of small, surface mount components. The LT1308µs current mode architecture provides fast response to load and line variations. The device is available in an 8-lead SO package.

  Features
LT1308 Not Recommended For New Designs
LT1308A Improved Transient Response, Burst Mode
LT1308B Improved Transient Response, Burst Mode Disabled

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
LT1308CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1308CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1308IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1308IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LT1308 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
LT1308CS8#PBF SO-8 C $4.25 $3.45 Yes
LT1308CS8#TRPBF SO-8 C $3.51 Yes
LT1308IS8#PBF SO-8 I $4.90 $3.95 Yes
LT1308IS8#TRPBF SO-8 I $4.01 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

  • GSM Terminals
  • Digital Cameras
  • Answer-Back Pagers
  • Cordless Telephones
  • DECT Phones
  • GPS Receivers
  • Battery Backup Supplies

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

Models for the following parts are available in LTspice IV:
LT1308A
LT1308B

Technical Support