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LT1307 - Single Cell Micropower 600kHz PWM DC/DC Converters

Features

  • Uses Small Ceramic Capacitors
  • 50µA Quiescent Current (LT1307)
  • 1mA Quiescent Current (LT1307B)
  • Operates with VIN as Low as 1V
  • 600kHz Fixed Frequency Operation
  • Starts into Full Load
  • Low Shutdown Current: 3µA
  • Low-Battery Detector
  • 3.3V at 75mA from a Single Cell
  • Automatic Burst Mode® Operation at Light Load (LT1307)
  • Continuous Switching at Light Load (LT1307B)
  • Low VCESAT Switch: 295mV at 500mA

Typical Application

LT1307 Typical Application
LT1307 Typical Application

Description

The LT1307/LT1307B are micropower, fixed frequency DC/DC converters that operate from an input voltage as low as 1V. First in the industry to achieve true current mode PWM performance from a single cell supply, the LT1307 features automatic shifting to power saving Burst Mode operation at light loads. High efficiency is maintained over a broad 100uA to 100mA load range. The LT1307B does not shift into Burst Mode operation at light loads, eliminating low frequency output ripple at the expense of light load efficiency. The devices contain a low-battery detector with a 200mV reference and shut down to less than 5µA. No load quiescent current of the LT1307 is 50µA and the internal NPN power switch handles a 500mA current with a voltage drop of just 295mV.

Unlike competitive devices, large electrolytic capacitors are not required with the LT1307/LT1307B in single cell applications. The high frequency (600kHz) switching allows the use of tiny surface mount multilayer ceramic (MLC) capacitors along with small surface mount inductors. The devices work with just 10µF of output capacitance and require only 1µF of input bypassing.

The LT1307/LT1307B are available in 8-lead MSOP, PDIP and SO packages.

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
LT1307BCMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LT1307BCMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LT1307BCS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1307BCS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1307BIS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1307BIS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1307CMS8#PBF MS-8 MS8 C 05-08-1660 Yes
LT1307CMS8#TRPBF MS-8 MS8 C 05-08-1660 Yes
LT1307CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LT1307CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1307CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1307IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LT1307IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LT1307 Package Drawing
LT1307 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
LT1307BCMS8#PBF MS-8 C $3.15 $2.40 Yes
LT1307BCMS8#TRPBF MS-8 C $2.46 Yes
LT1307BCS8#PBF SO-8 C $2.75 $2.05 Yes
LT1307BCS8#TRPBF SO-8 C $2.11 Yes
LT1307BIS8#PBF SO-8 I $3.50 $2.60 Yes
LT1307BIS8#TRPBF SO-8 I $2.66 Yes
LT1307CMS8#PBF MS-8 C $3.15 $2.40 Yes
LT1307CMS8#TRPBF MS-8 C $2.46 Yes
LT1307CN8#PBF N-8 C $2.75 $2.05 Yes
LT1307CS8#PBF SO-8 C $2.75 $2.05 Yes
LT1307CS8#TRPBF SO-8 C $2.11 Yes
LT1307IS8#PBF SO-8 I $3.50 $2.60 Yes
LT1307IS8#TRPBF SO-8 I $2.66 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
DC097A-A LT1307CS8 | Micropower DC/DC Converter, 1 Cell to 3V @ 60mA $100.00
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Click here to view our complete list of demo boards

Applications

  • Pagers
  • Cordless Telephones
  • GPS Receivers
  • Battery Backup
  • Portable Electronic Equipment
  • Glucose Meters
  • Diagnostic Medical Instrumentation

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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:
LT1307
LT1307b

Technical Support