LT3684 - 36V, 2A, 2.8MHz Step-Down Switching Regulator
Features
- 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
Typical Application
Description
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.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
MS-10, DFN-10
Order Info
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- 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 | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
|---|---|---|---|---|---|---|
| LT3684EDD#PBF | DFN | 10 | E | $4.21 | $2.95 | View |
| LT3684EDD#TRPBF | DFN | 10 | E | $3.01 | View | |
| LT3684EMSE#PBF | MSOP | 10 | E | $4.36 | $3.05 | View |
| LT3684EMSE#TRPBF | MSOP | 10 | E | $3.11 | View | |
| LT3684IDD#PBF | DFN | 10 | I | $5.06 | $3.54 | View |
| LT3684IDD#TRPBF | DFN | 10 | I | $3.60 | View | |
| LT3684IMSE#PBF | MSOP | 10 | I | $5.20 | $3.64 | View |
| LT3684IMSE#TRPBF | MSOP | 10 | I | $3.70 | View | |
| 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.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1188A | LT3684EMSE Demo Board | $150.00 | |
| Buy Now | |||
Applications
- Automotive Battery Regulation
- Power for Portable Products
- Distributed Supply Regulation
- Industrial Supplies
- Wall Transformer Regulation
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Simulate
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Related models available in LTspice IV
LT3684
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.
