LT3684
PRODUCTION36V, 2A, 2.8MHz Step-Down Switching Regulator
- Part Models
- 8
- 1ku List Price
- Starting From $4.48
Overview
- Wide Input Range: 3.6V to 34V Operating, 36V Maximum
- 2A Maximum Output Current
- Adjustable Switching Frequency: 300kHz to 2.8MHz
- Low Shutdown Current: IQ < 1µA
- Integrated Boost Diode
- Power Good Flag
- Saturating Switch Design: 0.18Ω On-Resistance
- 1.265V Feedback Reference Voltage
- Output Voltage: 1.265V to 20V
- Soft-Start Capability
- Small 10-Pin Thermally Enhanced MSOP and (3mm × 3mm) DFN Packages
The LT3684 is an adjustable frequency (300kHz to 2.8MHz) monolithic buck switching regulator that accepts input voltages up to 34V (36V maximum). A high efficiency 0.18Ω switch is included on the die along with a boost Schottky diode and the necessary oscillator, control and logic circuitry. Current mode topology is used for fast transient response and good loop stability. The LT3684’s high operating frequency allows the use of small, low cost inductors and ceramic capacitors resulting in low output ripple while keeping total solution size to a minimum. The low current shutdown mode reduces input supply current to less than 1µA while a resistor and capacitor on the RUN/SS pin provide a controlled output voltage ramp (soft-start). A power good flag signals when VOUT reaches 90% of the programmed output voltage. The LT3684 is available in 10-Pin MSOP and 3mm × 3mm DFN packages with Exposed Pads for low thermal resistance.
Applications
- Automotive Battery Regulation
- Power for Portable Products
- Distributed Supply Regulation
- Industrial Supplies
- Wall Transformer 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 |
|---|---|---|---|
| LT3684EDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT3684EDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT3684EMSE#PBF | 10-Lead MSOP w/ EP | ||
| LT3684EMSE#TRPBF | 10-Lead MSOP w/ EP | ||
| LT3684IDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT3684IDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LT3684IMSE#PBF | 10-Lead MSOP w/ EP | ||
| LT3684IMSE#TRPBF | 10-Lead MSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 11, 2022 - 22_0244 Epoxy Change from Henkel 8290 to 8290A for MSOP Package |
||
| LT3684EMSE#PBF | PRODUCTION | |
| LT3684EMSE#TRPBF | PRODUCTION | |
| LT3684IMSE#PBF | PRODUCTION | |
| LT3684IMSE#TRPBF | PRODUCTION | |
|
Jul 12, 2022 - 22_0157 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages [With Modification in BOM] |
||
| LT3684EMSE#PBF | PRODUCTION | |
| LT3684EMSE#TRPBF | PRODUCTION | |
| LT3684IMSE#PBF | PRODUCTION | |
| LT3684IMSE#TRPBF | PRODUCTION | |
|
Jun 21, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices |
||
| LT3684EMSE#PBF | PRODUCTION | |
| LT3684EMSE#TRPBF | PRODUCTION | |
| LT3684IMSE#PBF | PRODUCTION | |
| LT3684IMSE#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LT3684EMSE#PBF | PRODUCTION | |
| LT3684EMSE#TRPBF | PRODUCTION | |
| LT3684IMSE#PBF | PRODUCTION | |
| LT3684IMSE#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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|---|---|---|
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| Hot Swap Controllers 1 | ||
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| Power System Management (PSM) & Sequencers 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:
- LT3684
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
LT3684EMSE Demo Board | 4.5V ≤ VIN ≤ 34V, VOUT = 3.3V @ 2A