LT1317 - Micropower, 600kHz PWM DC/DC Converters


  • 100µA Quiescent Current
  • Operates with VIN as Low as 1.5V
  • 600kHz Fixed Frequency Operation
  • Starts into Full Load
  • Low-Battery Detector Active in Shutdown
  • Automatic Burst Mode Operation at Light Load (LT1317)
  • Continuous Switching at Light Loads (LT1317B)
  • Low VCESAT Switch: 300mV at 500mA
  • Pin for Pin Compatible with the LT1307/LT1307B

Typical Application

LT1317 Typical Application
LT1317 Typical Application


The LT1317/LT1317B are micropower, fixed frequency step-up DC/DC converters that operate over a wide input voltage range of 1.5V to 12V. The LT1317 features automatic shifting to power saving Burst Mode’ operation at light loads. High efficiency is maintained over a broad 300µA to 200mA load range. Peak switch current during Burst Mode operation is kept below 250mA for most operating conditions which results in low output ripple voltage, even at high input voltages. The LT1317B does not shift into Burst Mode operation at light loads, eliminating low frequency output ripple at the expense of light load efficiency.The LT1317/LT1317B contain an internal low-battery detector with a 200mV reference that stays alive when the device goes into shutdown.No-load quiescent current of the LT1317 is 100µA and shuts down to 30µA. The internal NPN power switch handles a 500mA current with a voltage drop of just 300mV.The LT1317/LT1317B are available in MS8 and SO-8 packages.


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
LT1317BCMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LT1317BCMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LT1317BCS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1317BCS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1317BIS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1317BIS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1317CMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LT1317CMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LT1317CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1317CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1317IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1317IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes

LT1317 Package Drawing
LT1317 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
LT1317BCMS8#PBF MS-8 C $2.75 $2.45 Yes
LT1317BCMS8#TRPBF MS-8 C $2.51 Yes
LT1317BCS8#PBF SO-8 C $2.45 $2.25 Yes
LT1317BCS8#TRPBF SO-8 C $2.31 Yes
LT1317BIS8#PBF SO-8 I $3.30 $2.80 Yes
LT1317BIS8#TRPBF SO-8 I $2.86 Yes
LT1317CMS8#PBF MS-8 C $2.75 $2.45 Yes
LT1317CMS8#TRPBF MS-8 C $2.51 Yes
LT1317CS8#PBF SO-8 C $2.45 $2.25 Yes
LT1317CS8#TRPBF SO-8 C $2.31 Yes
LT1317IS8#PBF SO-8 I $3.10 $2.80 Yes
LT1317IS8#TRPBF SO-8 I $2.86 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
DC194A-A LT1317CMS8 | MICROPOWER DC/DC CONVERTER, BURST MODE, 2 CELL to 3.3/5.0V @ 300/180mA $100.00
DC194A-B LT1317BCMS8 | MICROPOWER DC/DC CONVERTER, FIXED FREQ., 2 CELL to 3.3/5.0V @ 300/180mA $100.00
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