LTC7803

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. B) Product Selection Table

Part Models: 32
1ku List Price: Starting From $2.51

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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
Output Voltage Up to 40V
Spread Spectrum Operation
R_SENSE 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 I_Q: 1.2μA
Thermally Enhanced 16-Pin 3mm × 3mm QFN and MSOP Packages
AEC-Q100 Qualified for Automotive Applications

Part Models: 32
1ku List Price: Starting From $2.51

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
LTC7803EMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803EMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803EMSE#WPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803EMSE#WTRPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803EUD#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803EUD#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803EUD#WPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803EUD#WTRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803HMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803HMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803HMSE#WPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803HMSE#WTRPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803HUD#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803HUD#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803HUD#WPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803HUD#WTRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803IMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803IMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803IMSE#WPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803IMSE#WTRPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803IUD#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803IUD#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803IUD#WPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803IUD#WTRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803JMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803JMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803JMSE#WPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803JMSE#WTRPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803JUD#PBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803JUD#TRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803JUD#WPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7803JUD#WTRPBF	16-Lead QFN (3mm x 3mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC7803EMSE#PBF	PRODUCTION
LTC7803EMSE#TRPBF	PRODUCTION
LTC7803EMSE#WPBF	PRODUCTION
LTC7803EMSE#WTRPBF	PRODUCTION
LTC7803HMSE#PBF	PRODUCTION
LTC7803HMSE#TRPBF	PRODUCTION
LTC7803HMSE#WPBF	PRODUCTION
LTC7803HMSE#WTRPBF	PRODUCTION
LTC7803IMSE#PBF	PRODUCTION
LTC7803IMSE#TRPBF	PRODUCTION
LTC7803IMSE#WPBF	PRODUCTION
LTC7803IMSE#WTRPBF	PRODUCTION
LTC7803JMSE#PBF	PRODUCTION
LTC7803JMSE#TRPBF	PRODUCTION
LTC7803JMSE#WPBF	PRODUCTION
LTC7803JMSE#WTRPBF	PRODUCTION
Aug 23, 2021 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0132_Form Material_Report Delta Qualification Matrix
LTC7803EMSE#PBF	PRODUCTION
LTC7803EMSE#TRPBF	PRODUCTION
LTC7803EMSE#WPBF	PRODUCTION
LTC7803EMSE#WTRPBF	PRODUCTION
LTC7803HMSE#PBF	PRODUCTION
LTC7803HMSE#TRPBF	PRODUCTION
LTC7803HMSE#WPBF	PRODUCTION
LTC7803HMSE#WTRPBF	PRODUCTION
LTC7803IMSE#PBF	PRODUCTION
LTC7803IMSE#TRPBF	PRODUCTION
LTC7803IMSE#WPBF	PRODUCTION
LTC7803IMSE#WTRPBF	PRODUCTION
LTC7803JMSE#PBF	PRODUCTION
LTC7803JMSE#TRPBF	PRODUCTION
LTC7803JMSE#WPBF	PRODUCTION
LTC7803JMSE#WTRPBF	PRODUCTION
Jun 21, 2022 - 22_0050 UTAC Thai Limited (UTL) as Alternate Assembly Site for MSOP Packages / Devices
		PCN22_0050_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC7803JMSE#WPBF	PRODUCTION
LTC7803JMSE#WTRPBF	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Protection Switches & Controllers 2
LTC4238	Obsolete	High Voltage High Current Hot Swap Controller
LTC4381	RECOMMENDED FOR NEW DESIGNS	Low Quiescent Current eFuse with Surge Protection

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC7803

LTpowerCAD 2

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.

LTpowerCAD^® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

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

Buy Now View Details

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 R_SENSE or inductor DCR current sensing (optional).

Product Details

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 EXTV_CC. The third possibility is connecting an external voltage source to EXTV_CC 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.