LTC7803-3.3

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. 0) Product Selection Table

Part Models: 4
1ku List Price: Starting From $2.18

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Overview

Low Operating I_Q: 12μA (14V V_IN to 3.3V V_OUT)
Wide Input Voltage Range: 4.5V to 40V
Fixed 3.3V Regulated Output Voltage
Spread Spectrum Operation
R_SENSE or DCR Current Sensing
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 I_Q: 1.2μA
Thermally Enhanced 16-Lead 3mm × 3mm QFN Package
AEC-Q100 Qualified for Automotive Applications

The LTC7803-3.3 is a high performance 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 LTC7803‑3.3 operates from a wide 4.5V to 40V input supply range and regulates the output to a fixed 3.3V voltage using an internal feedback resistor divider.

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 LTC7803-3.3 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

Part Models: 4
1ku List Price: Starting From $2.18

Documentation

Data Sheet 1

LTC7803-3.3: 40V Low I_Q, 3MHz Synchronous Step-Down Controller with Spread Spectrum Data Sheet (Rev.0) 09/14/2021

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
LTC7803JUD-3.3#WPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7803JUD-3.3#WTRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7803RUD-3.3#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7803RUD-3.3#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC7803

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

LTC7803

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.

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