LT3514
PRODUCTIONTriple Step-Down Switching Regulator with 100% Duty Cycle Operation
- Part Models
- 9
- 1ku List Price
- Starting From $5.31
Overview
- 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
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
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 |
|---|---|---|---|
| LT3514EFE#PBF | 24-Lead TSSOP w/ EP | ||
| LT3514EFE#TRPBF | 24-Lead TSSOP w/ EP | ||
| LT3514EUFD#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LT3514EUFD#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LT3514HFE#PBF | 24-Lead TSSOP w/ EP | ||
| LT3514IFE#PBF | 24-Lead TSSOP w/ EP | ||
| LT3514IFE#TRPBF | 24-Lead TSSOP w/ EP | ||
| LT3514IUFD#PBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LT3514IUFD#TRPBF | 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
May 18, 2026 - 26_0072 Epoxy Change for Select TSSOP Products |
||
| LT3514EFE#PBF | PRODUCTION | |
| LT3514EFE#TRPBF | PRODUCTION | |
| LT3514HFE#PBF | PRODUCTION | |
| LT3514IFE#PBF | PRODUCTION | |
| LT3514IFE#TRPBF | PRODUCTION | |
|
Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only) |
||
| LT3514EFE#PBF | PRODUCTION | |
| LT3514EFE#TRPBF | PRODUCTION | |
| LT3514EUFD#PBF | PRODUCTION | |
| LT3514EUFD#TRPBF | PRODUCTION | |
| LT3514HFE#PBF | PRODUCTION | |
| LT3514IFE#PBF | PRODUCTION | |
| LT3514IFE#TRPBF | PRODUCTION | |
| LT3514IUFD#PBF | PRODUCTION | |
| LT3514IUFD#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LT3514EFE#PBF | PRODUCTION | |
| LT3514EFE#TRPBF | PRODUCTION | |
| LT3514HFE#PBF | PRODUCTION | |
| LT3514IFE#PBF | PRODUCTION | |
| LT3514IFE#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
| Parts | Product Life Cycle | Description |
|---|---|---|
| Hot Swap Controllers 1 | ||
| LT4363 | RECOMMENDED FOR NEW DESIGNS | High Voltage Surge Stopper with Current Limit |
| Power System Management (PSM) & Sequencers 1 | ||
| LTC2977 | RECOMMENDED FOR NEW DESIGNS | 8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LT3514
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
LT3514 Demo Board | 5.4V to 36VIN, Triple Output; VOUT1 = 5V @ 1A, VOUT2 = 3.3V @ 2A, VOUT3 = 1.8V @ 1A