LT3686
PRODUCTION37V/1.2A Step-Down Regulator in 3mm × 3mm DFN
- Part Models
- 6
- 1ku List Price
- Starting From $3.82
Overview
- 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
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
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 |
|---|---|---|---|
| LT3686EDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT3686EDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT3686HDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT3686HDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT3686IDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT3686IDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
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| Circuit Monitors 1 | ||
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| Hot Swap Controllers 1 | ||
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| Switching Regulators & Controllers 1 | ||
| LTC3880 | RECOMMENDED FOR NEW DESIGNS | Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management |
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
LT3686EDD Demo Board | 5V ≤ VIN ≤ 37V (55V Transients), VOUT = 3.3V @ 1.2A
Resources
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