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LT3686: 37V/1.2A Step-Down Regulator in 3mm × 3mm DFN Data Sheet5/31/2011PDF514K
Overview
Features and Benefits
- Wide Input Range:
- Operation from 3.6V to 37V
- Overvoltage Lockout Protects Circuit Through 55V Transients
- Low Minimum On-Time:
- Converts 16VIN to 3.3VOUT at 2MHz
- 1.2A Output Current
- Adjustable Frequency: 300kHz to 2.5MHz
- Constant Switching Frequency at Light Loads
- Tracking and Soft-Start
- Precision UVLO
- Short-Circuit Robust
- IQ in Shutdown <1μA
- Internally Compensated
- 10-Lead 3mm × 3mm DFN Package
Product Details
The LT3686 is a current mode PWM step-down DC/DC converter with an internal 1.2A power switch, packaged in 10-lead 3mm × 3mm DFN. The wide input range of 3.6V to 37V makes the LT3686 suitable for regulating power from a wide variety of sources, including 24V industrial supplies and automotive batteries. Its high maximum frequency allows the use of tiny inductors and capacitors, resulting in a very small solution. Operating frequency above the AM band avoids interfering with radio reception, making the LT3686 particularly suitable for automotive applications.
Cycle-by-cycle current limit and DA current sense provide protection against fault conditions. Soft-start and frequency foldback eliminate input current surge during start-up. An optional internal regulated active load at the output via the BD pin keeps the LT3686 at full switching frequency at light loads, resulting in low, predictable output ripple above the audio and AM bands. Internal compensation and an internal boost diode reduce external component count.
| Overvoltage Protections | Features | |
| LT3686 | 55V | - |
| LT3686A | 60V | External Synchronization |
Applications
- Automotive Systems
- Battery-Powered Equipment
- Wall Transformer Regulation
- Distributed Supply Regulation
Product Categories
Product Lifecycle
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)
Documentation & Resources
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R530 Reliability Data3/26/2018PDF20 K
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DC1323A - Demo Manual3/12/2010PDF553K
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 Simulations
Models for the following parts are available in LTspice:
LT3686
LT3686A
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 |
|---|---|---|---|---|
| LT3686EDD#PBF | Material Declaration | Reliability Data | 10-Lead DFN (3mm x 3mm w/ EP) | |
| LT3686EDD#TRPBF | Material Declaration | Reliability Data | 10-Lead DFN (3mm x 3mm w/ EP) | |
| LT3686HDD#PBF | Material Declaration | Reliability Data | 10-Lead DFN (3mm x 3mm w/ EP) | |
| LT3686HDD#TRPBF | Material Declaration | Reliability Data | 10-Lead DFN (3mm x 3mm w/ EP) | |
| LT3686IDD#PBF | Material Declaration | Reliability Data | 10-Lead DFN (3mm x 3mm w/ EP) | |
| LT3686IDD#TRPBF | Material Declaration | Reliability Data | 10-Lead DFN (3mm x 3mm w/ EP) | |
| Wafer Fabrication Data | R530 Reliability Data |
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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.