LT1308A and B - Single Cell High Current Micropower 600kHz Boost DC/DC Converter

Features

  • 5V at 1A from a Single Li-Ion Cell
  • 5V at 800mA in SEPIC Mode from Four NiCd Cells
  • Fixed Frequency Operation: 600kHz
  • Boost Converter Outputs up to 34V
  • Starts into Heavy Loads
  • Automatic Burst Mode Operation at Light Load (LT1308A)
  • Continuous Switching at Light Loads (LT1308B)
  • Low VCESAT Switch: 300mV at 2A
  • Pin-for-Pin Upgrade Compatible with LT1308
  • Lower Quiescent Current in Shutdown: 1µA (Max)
  • Improved Accuracy Low-Battery Detector Reference: 200mV ±2%
  • Available in 8-Lead SO and 14-Lead TSSOP Packages

Typical Application

LT1308A Typical Application
LT1308A Typical Application

Description

The LT1308A/LT1308B are micropower, fixed frequency step-up DC/DC converters that operate over a 1V to 10V input voltage range. They are improved versions of the LT1308 and are recommended for use in new designs. The LT1308A features automatic shifting to power saving Burst Mode operation at light loads and consumes just 140µA at no load. The LT1308B features continuous switching at light loads and operates at a quiescent current of 2.5mA. Both devices consume less than 1µA in shutdown.

Low-battery detector accuracy is significantly tighter than the LT1308. The 200mV reference is specified at ±2% at room and ±3% over temperature. The shutdown pin enables the device when it is tied to a 1V or higher source and does need to be tied to VIN as on the LT1308. An internal VCC clamp results in improved transient response and the switch voltage rating has been increased to 36V, enabling higher output voltage applications.

The LT1308A/LT1308B are available in the 8-lead SO and the 14-lead TSSOP packages.

  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
LT1308ACS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1308ACS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1308AIS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1308AIS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1308BCS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1308BCS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1308BIS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1308BIS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LT1308A Package Drawing
LT1308A 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
LT1308ACS8#PBF SO-8 C $3.95 $3.25 Yes
LT1308ACS8#TRPBF SO-8 C $3.31 Yes
LT1308AIS8#PBF SO-8 I $4.55 $3.75 Yes
LT1308AIS8#TRPBF SO-8 I $3.81 Yes
LT1308BCS8#PBF SO-8 C $3.95 $3.25 Yes
LT1308BCS8#TRPBF SO-8 C $3.31 Yes
LT1308BIS8#PBF SO-8 I $4.55 $3.75 Yes
LT1308BIS8#TRPBF SO-8 I $3.81 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
DC207A-B CUSTOM LT1308ACS8 Demo Board $100.00
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Click here to view our complete list of demo boards

Applications

  • GSM/CDMA Phones
  • Digital Cameras
  • LCD Bias Supplies
  • Answer-Back Pagers
  • GPS Receivers
  • Battery Backup Supplies
  • Handheld Computers

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:
LT1308A
LT1308B

Technical Support