LT3514
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LT3514

Triple Step-Down Switching Regulator with 100% Duty Cycle Operation

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Info: : PRODUCTION tooltip
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Part Details
Part Models 9
1ku List Price Starting From $4.19
Features
  • 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
Additional Details
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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
Part Models 9
1ku List Price Starting From $4.19

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

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

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Filter by Model

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Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

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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

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC1980A

LT3514 Demo Board | 5.4V to 36VIN, Triple Output; VOUT1 = 5V @ 1A, VOUT2 = 3.3V @ 2A, VOUT3 = 1.8V @ 1A

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DC1980A

LT3514 Demo Board | 5.4V to 36VIN, Triple Output; VOUT1 = 5V @ 1A, VOUT2 = 3.3V @ 2A, VOUT3 = 1.8V @ 1A

LT3514 Demo Board | 5.4V to 36VIN, Triple Output; VOUT1 = 5V @ 1A, VOUT2 = 3.3V @ 2A, VOUT3 = 1.8V @ 1A

Product Detail

Demonstration circuit 1980A is a triple current mode PWM step-down DC/DC converter featuring the LT3514. The demo circuit is designed for 5V, 3.3V and 1.8V outputs from a 5.4V to 36V input. The current capability of 5V and 1.8V outputs is 1A and the 3.3V output is capable of 2A output. Individual soft-start and current limit for each output as well as frequency synchronous function simplify the complex design of triple-output power converters.

Tools & Simulations

Tools & Simulations 1

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.

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