LTC7803
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LTC7803

40V Low IQ, 3MHz Synchronous Step-Down Controller with Spread Spectrum

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LTspice LTC7803 - Step-Down (Buck) Regulators Download 3.62 KB
Part Models 32
1ku List Price Starting From $2.18
Features
  • Low Operating IQ: 12µA (14V VIN to 3.3V VOUT)
  • Wide Input Voltage Range: 4.5V to 40V
  • Output Voltage Up to 40V
  • Spread Spectrum Operation
  • RSENSE or DCR Current Sensing
  • PassThru™/100% Duty Cycle Capable
  • Programmable Fixed Frequency (100kHz to 3MHz)
  • Phase-Lockable Frequency (100kHz to 3MHz)
  • Selectable Continuous, Pulse-Skipping, or Low Ripple Burst Mode® Operation at Light Loads
  • Low Shutdown IQ: 1.2μA
  • Thermally Enhanced 16-Pin 3mm × 3mm QFN and MSOP Packages
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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The LTC7803 is a high performance, 100% Duty Cycle Capable, synchronous step-down DC/DC switching regulator controller that drives an all N-channel power MOSFET stage. Synchronous rectification increases efficiency, reduces power losses and eases thermal requirements. A constant frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7803 operates from a wide 4.5V to 40V input supply range.

The very low no-load quiescent current extends operating runtime in battery powered systems. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at light loads.

The LTC7803 additionally features spread spectrum operation which significantly reduces the peak radiated and conducted noise on both the input and output supplies, making it easier to comply with electromagnetic interference (EMI) standards. 

APPLICATIONS

  • Automotive and Transportation
  • Industrial
  • Military/Avionics
  • Telecommunications
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file View Data Sheet (Rev.B)
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LTspice LTC7803 - Step-Down (Buck) Regulators Download 3.62 KB
Part Models 32
1ku List Price Starting From $2.18
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LTC7803

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UPDATED 05/05/2020
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LTC7803: 40V Low IQ, 3MHz Synchronous Step-Down Controller with Spread Spectrum Data Sheet (Rev.B)

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LTC7803: スペクトラム拡散機能を備えた40V、低IQ、3MHz同期整流式降圧コントローラ データシート (Rev.0)

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User Guide

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DC2834A - Demo Manual (Rev.0) redirect icon

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UPDATED 04/01/2020
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LTC7803或先进电源便捷设计之路 redirect icon

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先進的な電源の設計を容易にするLTC7803 redirect icon

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Documentation

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
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LTC7803HMSE#PBF 16-Lead MSOP w/ EP external-link
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LTC7803IMSE#PBF 16-Lead MSOP w/ EP external-link
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LTC7803IMSE#TRPBF 16-Lead MSOP w/ EP external-link
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LTC7803IMSE#WPBF 16-Lead MSOP w/ EP external-link
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LTC7803IMSE#WTRPBF 16-Lead MSOP w/ EP external-link
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LTC7803IUD#PBF 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) external-link
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LTC7803IUD#WPBF 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) external-link
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LTC7803IUD#WTRPBF 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) external-link
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LTC7803JMSE#PBF 16-Lead MSOP w/ EP external-link
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LTC7803JUD#PBF 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) external-link
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LTC7803JUD#TRPBF 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) external-link
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LTC7803JUD#WPBF 16-Lead QFN (3mm x 3mm x 0.75mm w/ EP) external-link
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Evaluation Kits 1

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DC2834A

LTC7803EMSE Demo Board | High Frequency, Low IQ Synchronous Step-Down Controller

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DC2834A

LTC7803EMSE Demo Board | High Frequency, Low IQ Synchronous Step-Down Controller

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DC2834A
LTC7803EMSE Demo Board | High Frequency, Low IQ Synchronous Step-Down Controller

Features and Benefits

  • Wide input voltage range: from 5V to 38V
  • High load current, up to 20A
  • Extremely low quiescent current: 15μA in sleep mode and as low as 1μA at shutdown
  • Ability to select spread spectrum or fixed frequency
  • Selectable pulse-skipping, forced continuous operation or low ripple Burst Mode® operation at light loads
  • Synchronization with external clock
  • The DC2834A supports RSENSE or inductor DCR current sensing (optional).
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Product Detail

Demonstration circuit DC2834A is a DC/DC synchronous step-down converter featuring the LTC7803 (MSE package), a spread spectrum or constant frequency current mode synchronous step-down controller. The DC2834A generates a 3.3V of output voltage.

The 500kHz constant switching frequency operation results in a small and efficient circuit.

The converter provides high output voltage accuracy (typically ±2%) over wide load range with no minimum load requirement.

The DC2834A supports two ways of biasing the controller: directly from the input voltage or output rail through EXTVCC. The third possibility is connecting an external voltage source to EXTVCC terminal.

The DC2834A supports extremely wide switching frequency range from 100kHz to 3MHz. The spread spectrum operation reduces the peak radiated and conducted noise to simplify compliance with electromagnetic interference (EMI) standards.

The DC2834A has a small circuit footprint, is a high performance and high density solution for telecom, automotive and Power over Ethernet applications.

Resources

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DC2834A - Schematic Download

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DC2834A - Demo Manual (Rev.0) Download

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DC2834A - Design File Download

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Evaluation Kits1

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DC2834A

LTC7803EMSE Demo Board | High Frequency, Low IQ Synchronous Step-Down Controller

Tools & Simulations 2

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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LTC7803 - Step-Down (Buck) Regulators Download

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