LT3686A
PRODUCTION37V/1.2A Step-Down Regulator in 3mm × 3mm DFN and MSE
- Part Models
- 10
- 1ku List Price
- Starting From $3.82
Overview
- Wide Input Range:
- Operation from 3.6V to 37V
- Overvoltage Lockout Protects Circuit Through 60V 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
- Can Be Synchronized to External Clock
- Tracking and Soft-Start
- Precision UVLO
- Short-Circuit Robust
- IQ in Shutdown <1μA
- Internally Compensated
- Thermally Enhanced eMSOP and 3mm × 3mm DFN Packages
The LT3686A is a current mode PWM step-down DC/DC converter with an internal power switch. The wide input range of 3.6V to 37V makes the LT3686A 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 LT3686A particularly suitable for automotive applications.
Cycle-by-cycle current limit, thermal shutdown 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 LT3686A 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.
The LT3686A offers external synchronization capability, whereas the LT3686 does not.
| Overvoltage Protections | Features | |
| LT3686 | 55V | - |
| LT3686A | 60V | External Synchronization |
Applications
- Automotive Systems
- Battery-Powered Equipment
- Wall Transformer Regulation
- Distributed Supply Regulation
Documentation
Data Sheet 1
User Guide 1
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 Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT3686AEDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT3686AEDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT3686AEMSE#PBF | 12-Lead MSOP w/ EP | ||
| LT3686AEMSE#TRPBF | 12-Lead MSOP w/ EP | ||
| LT3686AHMSE#PBF | 12-Lead MSOP w/ EP | ||
| LT3686AHMSE#TRPBF | 12-Lead MSOP w/ EP | ||
| LT3686AIDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT3686AIDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT3686AIMSE#PBF | 12-Lead MSOP w/ EP | ||
| LT3686AIMSE#TRPBF | 12-Lead MSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only) |
||
| LT3686AEDD#PBF | PRODUCTION | |
| LT3686AEDD#TRPBF | PRODUCTION | |
| LT3686AEMSE#PBF | PRODUCTION | |
| LT3686AEMSE#TRPBF | PRODUCTION | |
| LT3686AHMSE#PBF | PRODUCTION | |
| LT3686AHMSE#TRPBF | PRODUCTION | |
| LT3686AIMSE#PBF | PRODUCTION | |
| LT3686AIMSE#TRPBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package |
||
| LT3686AEMSE#PBF | PRODUCTION | |
| LT3686AEMSE#TRPBF | PRODUCTION | |
| LT3686AHMSE#PBF | PRODUCTION | |
| LT3686AHMSE#TRPBF | PRODUCTION | |
| LT3686AIMSE#PBF | PRODUCTION | |
| LT3686AIMSE#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0129 Laser Mark Conversion for 12-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LT3686AEMSE#PBF | PRODUCTION | |
| LT3686AEMSE#TRPBF | PRODUCTION | |
| LT3686AHMSE#PBF | PRODUCTION | |
| LT3686AHMSE#TRPBF | PRODUCTION | |
| LT3686AIMSE#PBF | PRODUCTION | |
| LT3686AIMSE#TRPBF | PRODUCTION | |
|
Apr 18, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices |
||
| LT3686AIMSE#PBF | PRODUCTION | |
| LT3686AIMSE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
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|---|---|---|
| Circuit Monitors 1 | ||
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| Switching Regulators & Controllers 1 | ||
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Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3686
- LT3686A
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.
Evaluation Kits
LT3686AEDD Demo Board | 5V ≤ VIN ≤ 37V (55V Transients), VOUT = 3.3V @ 1.2A, SYNC Pin
Resources
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