LT3692 - Monolithic Dual Tracking 3.5A Step-Down Switching Regulator
Features
- Wide Input Range:
– Operation from 3V to 36V
– OVLO Protects Circuit Through 60V Transients - Independent Supply, Shutdown, Soft-Start, 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
- Enhanced Short-Circuit Protection
- Low Dropout: 95% Maximum Duty Cycle
- 5mm × 5mm QFN Package
AEC-Q100 data available for specific packages
Typical Application
Description
The LT3692 is a dual current mode PWM step-down DC/DC converter with two internal 3.8A switches. Independent input voltage, shutdown, feedback, soft-start, 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 to <10μA.
| Min On-Time | Features | Package | |
| LT3692 | 180ns | - | 5x5 QFN-32 |
| LT3692A | 140ns | Programmable Shutdown UVLO | TSSOP-38E, 5x5 QFN-32 |
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 |
|---|---|---|---|---|---|
| LT3692EUH#PBF | 5x5 QFN-32 | UH | E | 05-08-1693 | Yes |
| LT3692EUH#TRPBF | 5x5 QFN-32 | UH | E | 05-08-1693 | Yes |
| LT3692IUH#PBF | 5x5 QFN-32 | UH | I | 05-08-1693 | Yes |
| LT3692IUH#TRPBF | 5x5 QFN-32 | UH | I | 05-08-1693 | Yes |
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 | |
|---|---|---|---|---|---|---|
| LT3692EUH#PBF | 5x5 QFN-32 | E | $6.07 | $4.25 | Yes | |
| LT3692EUH#TRPBF | 5x5 QFN-32 | E | $4.31 | Yes | ||
| LT3692IUH#PBF | 5x5 QFN-32 | I | $6.71 | $4.70 | Yes | |
| LT3692IUH#TRPBF | 5x5 QFN-32 | I | $4.76 | Yes | ||
| Buy Now • Request Samples | ||||||
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.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 | |
|---|---|---|---|---|---|---|
| LT3692IUH#PBF | 5x5 QFN-32 | I | $6.71 | $4.70 | Yes | |
| LT3692IUH#TRPBF | 5x5 QFN-32 | I | $4.76 | Yes | ||
| Buy Now • Request Samples | ||||||
Applications
- Automotive Supplies
- Distributed Supply Regulation
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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
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:
LT3692
LT3692A
LTpowerCAD
The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD
Design tools for the following parts are available in LTpowerCAD:
LT3692A
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
