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  2. Power Management
  3. Switching Regulators
  4. Step-Down (Buck) Regulators
  5. Multiple Output Buck Regulators
  6. LT3692A


Overview

Features and Benefits

  • Wide Input Range:
    • Operation from 3V to 36V
    • OVLO Protects Circuit Through 60V Transients
  • Independent Supply, Shutdown, Soft-Start, UVLO, Programmable Current Limit and Programmable Power Good for Each 3.5A Regulator
  • Die Temperature Monitor
  • Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 2.25MHz with Synchronized Clock Output
  • Independent Synchronized Switching Frequencies Optimize Component Size
  • Antiphase Switching
  • Outputs Can Be Paralleled
  • Flexible Output Voltage Tracking
  • Low Dropout: 95% Maximum Duty Cycle
  • 5mm × 5mm QFN Package
  • FMEA Compliant 38-Pin Exposed Pad TSSOP Package

Product Details

The LT3692A is a dual current mode PWM step-down DC/DC converter with two internal 3.8A switches. Independent input voltage, shutdown, feedback, soft-start, UVLO current limit and comparator pins for each channel simplify complex power supply tracking and sequencing requirements.

To optimize efficiency and component size, both converters have a programmable maximum current limit and are synchronized to either a common external clock input, or a resistor settable fixed 250kHz to 2.25MHz internal oscillator. A frequency divider is provided for channel 1 to further optimize component size. At all frequencies, a 180° phase relationship between channels is maintained, reducing voltage ripple and component size. A clock output is available for synchronizing multiple regulators.

Minimum input to output voltage ratios are improved by allowing the switch to stay on through multiple clock cycles only switching off when the boost capacitor needs recharging. Independent channel operation can be programmed using the SHDN pin. Disabling both converters reduces the total quiescent current to <10μA.

The LT3692A is an improved version of the LT3692 with reduced minimum on-time.

Min On-Time Features Package
LT3692 180ns - 5 × 5 QFN-32
LT3692A 140ns Programmable Shutdown UVLO TSSOP-38E, 5 × 5 QFN-32

Applications

  • Automotive Supplies
  • Distributed Supply Regulation

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, 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.

LTspice

Models for the following parts are available in LTspice:

LT3692
LT3692A

Product Recommendations

LT3692A Companion Parts

Recommended Related Parts

Recommended Suggested Oscillator

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LT3692AEFE#PBF Material Declaration Reliability Data 38-Lead TSSOP w/ EP
LT3692AEFE#TRPBF Material Declaration Reliability Data 38-Lead TSSOP w/ EP
LT3692AEUH#PBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
LT3692AEUH#TRPBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
LT3692AHFE#PBF Material Declaration Reliability Data 38-Lead TSSOP w/ EP
LT3692AHFE#TRPBF Material Declaration Reliability Data 38-Lead TSSOP w/ EP
LT3692AHUH#PBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
LT3692AHUH#TRPBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
LT3692AIFE#PBF Material Declaration Reliability Data 38-Lead TSSOP w/ EP
LT3692AIFE#TRPBF Material Declaration Reliability Data 38-Lead TSSOP w/ EP
LT3692AIUH#PBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
LT3692AIUH#TRPBF Material Declaration Reliability Data 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
Wafer Fabrication Data R530 Reliability Data

PCN-PDN Information

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Sample & Buy


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Price Table Help

 

Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.