Overview
Features and Benefits
- Wide VIN Range: 4.5V to 38V
- Line Feedforward Compensation
- Low Minimum On-Time: tON(MIN) < 30ns
- Powerful On-board MOSFET Drivers
- Leading Edge Modulation Voltage Mode Control
- ±0.75%, 0.6V Reference Voltage Accuracy Over Temperature
- VOUT Range: 0.6V to 0.8VIN
- Programmable, Cycle-by-Cycle Peak Current Limit
- Sense Resistor or RDS(ON) Current Sensing
- Programmable Soft-Start
- Synchronizable Fixed Frequency from 250kHz to 1MHz
- Selectable Pulse-Skipping or Forced Continuous Modes of Operation
- Low Shutdown Current: 14μA Typical
- Thermally Enhanced 16-Lead MSOP and 3mm × 3mm QFN Packages
Product Details
The LTC3775 is a high efficiency synchronous step-down switching DC/DC controller that drives an all N-channel power MOSFET stage from a 4.5V to 38V input supply voltage. A patented line feedforward compensation circuit and a high bandwidth error amplifier provide very fast line and load transient response.
High step-down ratios are made possible by a low 30ns minimum on-time, allowing extremely low duty cycles. MOSFET RDS(ON) current sensing maximizes efficiency. Alternatively, a sense resistor can be used for higher current limit accuracy. Continuous monitoring of the voltages across the top and bottom MOSFETs allows cycle-by-cycle control of the inductor current, configurable by external resistors.
The soft-start function controls the duty cycle during start-up, providing a smooth output voltage ramp up. The operating frequency is user programmable from 250kHz to 1MHz and can be synchronized to an external clock.
Applications
- Automotive Systems
- Telecom and Industrial Power Supplies
- Point of Load Applications
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 (2)
Documentation & Resources
-
R526 Reliability Data3/26/2018PDF365 K
-
DC1290A - Demo Manual1/15/2010PDF890K
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:
LTC3775
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 |
|---|---|---|---|---|
| LTC3775EMSE#PBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
| LTC3775EMSE#TRPBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
| LTC3775EUD#PBF | Material Declaration | Reliability Data | 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) | |
| LTC3775EUD#TRPBF | Material Declaration | Reliability Data | 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) | |
| LTC3775IMSE#PBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
| LTC3775IMSE#TRPBF | Material Declaration | Reliability Data | 16-Lead MSOP w/ EP | |
| LTC3775IUD#PBF | Material Declaration | Reliability Data | 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) | |
| LTC3775IUD#TRPBF | Material Declaration | Reliability Data | 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) | |
| Wafer Fabrication Data | R526 Reliability Data |
PCN-PDN Information
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Support & Discussions
LTC3775 Discussions
Sample & Buy
Ordering FAQs
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Buy Now Pricing
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List Pricing
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Lead Times
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Sampling
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
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.