LTC1174 - High Efficiency Step-Down and Inverting DC/DC Converter

Features

  • High Efficiency: Up to 94%
  • Peak Inductor Current Independent of Inductor Value
  • Short-Circuit Protection
  • Optimized for 5V to –5V Applications
  • Wide VIN Range: 4V to 18.5V
  • Low Dropout Operation
  • Low-Battery Detector
  • Pin Selectable Current Limit
  • Internal 0.9Ω Power Switch: VIN = 9V
  • Only Four External Components Required
  • 130µA Standby Current
  • Active Low Micropower Shutdown

Typical Application

LTC1174 Typical Application
LTC1174 Typical Application

Description

The LTC®1174 is a simple current mode DC/DC converter ideally suited for 9V to 5V, 5V to 3.3V or 5V to –5V operation. With an internal 0.9Ω switch (at a supply voltage of 9V), the LTC1174 requires only four external components to construct a complete high efficiency DC/DC converter.

Under a no load condition the LTC1174 draws only 130μA. In shutdown, it draws a mere 1μA making this converter ideal for current sensitive applications. In dropout, the internal P-channel MOSFET switch is turned on continuously allowing the user to maximize the life of the battery source.

The maximum inductor current of the LTC1174 family is pin selectable to either 340mA or 600mA, optimizing efficiency for a wide range of applications. Operation up to 200kHz permits the use of small surface mount inductors and capacitors.

For applications requiring higher output current or ultrahigh efficiency, see the LTC1148 data sheet.

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
LTC1174CN8-3.3#PBF N-8 N C 05-08-1510 (N8) Yes
LTC1174CN8-5#PBF N-8 N C 05-08-1510 (N8) Yes
LTC1174CN8#PBF N-8 N C 05-08-1510 (N8) Yes
LTC1174CS8-3.3#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1174CS8-3.3#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1174CS8-5#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1174CS8-5#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1174CS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1174CS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1174HVCN8-3.3#PBF N-8 N C 05-08-1510 (N8) Yes
LTC1174HVCN8-5#PBF N-8 N C 05-08-1510 (N8) Yes
LTC1174HVCN8#PBF N-8 N C 05-08-1510 (N8) Yes
LTC1174HVCS8-3.3#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1174HVCS8-3.3#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1174HVCS8-5#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1174HVCS8-5#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1174HVCS8#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1174HVCS8#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LTC1174HVIS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1174HVIS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1174IN8#PBF N-8 N I 05-08-1510 (N8) Yes
LTC1174IS8#PBF SO-8 S8 I 05-08-1610 (S8) Yes
LTC1174IS8#TRPBF SO-8 S8 I 05-08-1610 (S8) Yes


LTC1174 Package Drawing
LTC1174 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
LTC1174CN8-3.3#PBF N-8 C $4.35 $3.50 Yes
LTC1174CN8-5#PBF N-8 C $4.35 $3.50 Yes
LTC1174CN8#PBF N-8 C $4.35 $3.50 Yes
LTC1174CS8-3.3#PBF SO-8 C $4.60 $3.70 Yes
LTC1174CS8-3.3#TRPBF SO-8 C $3.76 Yes
LTC1174CS8-5#PBF SO-8 C $4.60 $3.70 Yes
LTC1174CS8-5#TRPBF SO-8 C $3.76 Yes
LTC1174CS8#PBF SO-8 C $4.60 $3.70 Yes
LTC1174CS8#TRPBF SO-8 C $3.76 Yes
LTC1174HVCN8-3.3#PBF N-8 C $5.00 $4.00 Yes
LTC1174HVCN8-5#PBF N-8 C $5.00 $4.00 Yes
LTC1174HVCN8#PBF N-8 C $5.00 $4.00 Yes
LTC1174HVCS8-3.3#PBF SO-8 C $5.25 $4.15 Yes
LTC1174HVCS8-3.3#TRPBF SO-8 C $4.21 Yes
LTC1174HVCS8-5#PBF SO-8 C $5.25 $4.15 Yes
LTC1174HVCS8-5#TRPBF SO-8 C $4.21 Yes
LTC1174HVCS8#PBF SO-8 C $5.25 $4.15 Yes
LTC1174HVCS8#TRPBF SO-8 C $4.21 Yes
LTC1174HVIS8#PBF SO-8 I $5.80 $4.80 Yes
LTC1174HVIS8#TRPBF SO-8 I $4.86 Yes
LTC1174IN8#PBF N-8 I $5.00 $3.95 Yes
LTC1174IS8#PBF SO-8 I $5.25 $4.15 Yes
LTC1174IS8#TRPBF SO-8 I $4.21 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
DC059A-A LTC1174HV-5 | HIGH EFFICIENCY STEP-DOWN DC-DC CONVERTER 5V, @ 380mA $75.00
DC059A-B LTC1174HV-3.3 | HIGH EFFICIENCY STEP-DOWN DC-DC CONVERTER 3.3V, @ 400mA $75.00
DC059A-C LTC1174HVCS8 | HIGH EFFICIENCY STEP-DOWN DC-DC CONVERTER 3.3V, @ 375mA ADJUSTABLE $75.00
Buy Now
Click here to view our complete list of demo boards

Applications

  • Distributed Power Systems
  • Step-Down Converters
  • Inverting Converters
  • Memory Backup Supply
  • Portable Instruments
  • Battery-Powered Equipment

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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:
LTC1174
LTC1174-3.3
LTC1174-5
LTC1174HV
LTC1174HV-3.3
LTC1174HV-5

Technical Support