LTC1702A - Dual 550kHz Synchronous 2-Phase Switching Regulator Controller

Features

  • Pin Compatible with the LTC1702 with Improved Current Limit Control
  • Two Sides Run Out-of-Phase to Minimize CIN
  • No External Current Sense Resistors
  • Excellent Output Regulation: 1% Total Output Accuracy
  • Two Independent Controllers in One Package
  • All N-Channel External MOSFET Architecture
  • 550kHz Switching Frequency Minimizes External Component Size
  • 1A to 25A Output Current per Channel
  • High Efficiency over Wide Load Current Range
  • Less Than 100µA Shutdown Current
  • Small 24-Pin Narrow SSOP Package
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LTC1702A Typical Application

Description

The LTC1702A is a dual switching regulator controller optimized for high efficiency with low input voltages. It includes two complete, on-chip,independent switching regulator controllers each designed to drive a pair of external N-channel MOSFETs in a voltage mode feedback,synchronous buck configuration. The LTC1702A uses a constant-frequency, true PWM design switching at 550kHz, minimizing external component size and cost and maximizing load transient performance. The synchronous buck architecture automatically shifts to discontinuous and then to Burst Mode® operation as the output load decreases, ensuring maximum efficiency over a wide range of load currents.

The LTC1702A features an onboard reference trimmed to 0.5% and can provide better than 1% regulation at the converter outputs. Open-drain logic outputs indicate whether either output has risen to within 5% of the final output voltage and an optional latching FAULT mode protects the load if the output rises 15% above the intended voltage. Each channel can be enabled independently; with both channels disabled, the LTC1702A shuts down and supply current drops below 100µA.

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
LTC1702ACGN#PBF SSOP-24 GN C 05-08-1641 (GN24) Yes
LTC1702ACGN#TRPBF SSOP-24 GN C 05-08-1641 (GN24) Yes
LTC1702AIGN#PBF SSOP-24 GN I 05-08-1641 (GN24) Yes
LTC1702AIGN#TRPBF SSOP-24 GN I 05-08-1641 (GN24) Yes


LTC1702A 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
LTC1702ACGN#PBF SSOP-24 C $5.62 $4.75 Yes
LTC1702ACGN#TRPBF SSOP-24 C $4.85 Yes
LTC1702AIGN#PBF SSOP-24 I $6.33 $5.35 Yes
LTC1702AIGN#TRPBF SSOP-24 I $5.45 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
DC275A LTC1702ACGN | Dual Output Buck Regulators, Vin = 5.0V, Fswitch = 550kHz, Vout1 = jmpr sel @ 15A, Vout2 = 3.3V @ 15A Contact Factory
DC473A LTC1702ACGN | High Efficiency Dual Output Power Supply, 3V~7Vin, 1.8Vout @ 5A and 2.5Vout @ 5A $150.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports 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
LTC1702AIGN#PBF SSOP-24 I $6.33 $5.35 Yes
LTC1702AIGN#TRPBF SSOP-24 I $5.45 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

  • Microprocessor, DSP Core and I/O Supplies
  • Multiple Logic Supply Generator
  • Distributed Power Applications
  • High Efficiency Power Conversion

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

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:
LTC1702
LTC1702A

Technical Support