LT1738 - Slew Rate Controlled Ultralow Noise DC/DC Controller

Features

  • Greatly Reduced Conducted and Radiated EMI
  • Low Switching Harmonic Content
  • Independent Control of Output Switch Voltage and Current Slew Rates
  • Greatly Reduced Need for External Filters
  • Single N-Channel MOSFET Driver
  • 20kHz to 250kHz Oscillator Frequency
  • Easily Synchronized to External Clock
  • Regulates Positive and Negative Voltages
  • Easier Layout Than with Conventional Switchers
Designed for Automotive and Transportation Applications
AEC-Q100 generic family data available for specific packages


Typical Application

LT1738 Typical Application
LT1738 Typical Application

Description

The LT1738 is a switching regulator controller designed to lower conducted and radiated electromagnetic interference (EMI). Ultralow noise and EMI are achieved by controlling the voltage and current slew rates of an exter-nal N-channel MOSFET switch. Current and voltage slew rates can be independently set to optimize harmonic content of the switching waveforms vs efficiency. The LT1738 can reduce high frequency harmonic power by as much as 40dB with only minor losses in efficiency.

The LT1738 utilizes a current mode architecture optimized for single switch topologies such as boost, flyback and Cuk. The IC includes gate drive and all necessary oscillator, control and protection circuitry. Unique error amp circuitry can regulate both positive and negative voltages. The internal oscillator may be synchronized to an external clock for more accurate placement of switching harmonics.

Protection features include gate drive lockout for low VIN, soft-start, output current limit, short-circuit current limit-ing, gate drive overvoltage clamp and input supply undervoltage lockout.

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
LT1738EG#PBF SSOP-20 G E 05-08-1640 (G20) Yes
LT1738EG#TRPBF SSOP-20 G E 05-08-1640 (G20) Yes
LT1738IG#PBF SSOP-20 G I 05-08-1640 (G20) Yes
LT1738IG#TRPBF SSOP-20 G I 05-08-1640 (G20) Yes


LT1738 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
LT1738EG#PBF SSOP-20 E $4.85 $4.10 Yes
LT1738EG#TRPBF SSOP-20 E $4.20 Yes
LT1738IG#PBF SSOP-20 I $5.50 $4.65 Yes
LT1738IG#TRPBF SSOP-20 I $4.75 Yes
Buy NowRequest Samples
* 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
DC514A LT1738EG | Ulta Low Noise Boost Regulator, Vin = 5V + / - 5%, Vout = 12V @ 1A Contact Factory
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Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

Please contact your local sales representative for more information regarding reliability reports and AEC-Q100 data or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT1738IG#PBF SSOP-20 I $5.50 $4.65 Yes
LT1738IG#TRPBF SSOP-20 I $4.75 Yes
Buy NowRequest Samples
* 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.

Applications

  • Power Supplies for Noise Sensitive Communication Equipment
  • EMI Compliant Offline Power Supplies
  • Precision Instrumentation Systems
  • Isolated Supplies for Industrial Automation
  • Medical Instruments
  • Data Acquisition Systems

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:
LT1738

Technical Support