Overview
Features and Benefits
- Wide Input Voltage Range: 3.2V to 36V
(40V Transient) - Three Outputs: 2A, 1A, 1A
- 100% Duty Cycle Operation
- Resistor-Programmed Constant Frequency
- Short-Circuit Robust
- Wide SYNC Range: 350kHz to 2.2MHz
- Anti-Phase Switching Reduces Ripple
- Feedback Voltage: 800mV
- Independent Run/Soft-Start Pins
- Shutdown with UVLO
- Internal Compensation
- Thermal Shutdown
- Tiny 28-Lead (4mm × 5mm) Thermally Enhanced QFN Package
- 24-Lead Exposed Pad TSSOP
Product Details
The LT3514 consists of three buck regulators (2A, 1A, 1A output current). The device has a wide operating input range of 3.2V to 36V. An on-chip boost regulator allows each channel to operate up to 100% duty cycle. The LT3514 is designed to minimize external component count and results in a simple and small application circuit.
The LT3514 operates robustly in fault conditions. Cycleby- cycle peak current limit and catch diode current limit sensing protect the IC during overload conditions. Thermal shutdown protects the power switches at elevated temperatures. Soft-start helps control the peak inductor current during startup.
The LT3514 also features output voltage tracking and sequencing, programmable frequency, programmable undervoltage lockout, and a power good pin to indicate when all outputs are in regulation.
The LT3514 has one fewer channel (CH2) than the LT3504, and has one channel (CH3) that outputs 2A instead of 1A. The LT3514 in QFN is pin compatible with the LT3504. The LT3504 provides four 1A outputs.
Applications
- Automotive Battery Regulation
- Industrial Control Supplies
- Wall Transformer Regulation
- Distributed Supply Regulation
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 (1)
Documentation & Resources
-
R530 Reliability Data3/26/2018
-
DC1980A - Demo Manual8/14/2013
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.
Models for the following parts are available in LTspice:
LT3514
Product Recommendations
LT3514 Companion Parts
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 |
|---|---|---|---|---|
| LT3514EFE#PBF | Material Declaration | Reliability Data | 24-Lead TSSOP w/ EP | |
| LT3514EFE#TRPBF | Material Declaration | Reliability Data | 24-Lead TSSOP w/ EP | |
| LT3514EUFD#PBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| LT3514EUFD#TRPBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| LT3514IFE#PBF | Material Declaration | Reliability Data | 24-Lead TSSOP w/ EP | |
| LT3514IFE#TRPBF | Material Declaration | Reliability Data | 24-Lead TSSOP w/ EP | |
| LT3514IUFD#PBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| LT3514IUFD#TRPBF | Material Declaration | Reliability Data | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| Wafer Fabrication Data | R530 Reliability Data |
PCN-PDN Information
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Support & Discussions
Sample & Buy
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Evaluation Boards
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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.