LTC3809

PRODUCTION

No R_SENSE^™, Low EMI, Synchronous DC/DC Controller

Part Models: 4
1ku List Price: Starting From $3.02

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Part Details

No Current Sense Resistor Required
Selectable Spread Spectrum Frequency Modulation for Low Noise Operation
Constant Frequency Current Mode Operation for Excellent Line and Load Transient Response
True PLL for Frequency Locking or Adjustment (Frequency Range: 250kHz to 750kHz)
Wide V_IN Range: 2.75V to 9.8V
Wide V_OUT Range: 0.6V to V_IN
0.6V ±1.5% Reference
Low Dropout Operation: 100% Duty Cycle
Selectable Burst Mode^®/Pulse-Skipping/Forced Continuous Operation
Auxiliary Winding Regulation
Internal Soft-Start Circuitry
Output Overvoltage Protection
Micropower Shutdown: I_Q = 9µA
Tiny Thermally Enhanced Leadless (3mm × 3mm) DFN and 10-lead MSOP Packages

The LTC3809 is a synchronous step-down switching regulator controller that drives external complementary power MOSFETs using few external components. The constant frequency current mode architecture with MOSFET V_DS sensing eliminates the need for a current sense resistor and improves efficiency.

For noise sensitive applications, the LTC3809 can be externally synchronized from 250kHz to 750kHz. Burst Mode is inhibited during synchronization or when the SYNC/MODE pin is pulled low to reduce noise and RF interference. To further reduce EMI, the LTC3809 incorporates a novel spread spectrum frequency modulation technique.

Burst Mode operation provides high efficiency operation at light loads. 100% duty cycle provides low dropout operation, extending operating time in battery-powered systems.

The switching frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors.

The LTC3809 is available in the tiny footprint thermally enhanced DFN and 10-lead MSOP packages.


	Features	Package
LTC3809	PLL, Selectable Spread Spectrum, Power Good	3x3 DFN-10, MS-10E
LTC3809-1	Tracking	3x3 DFN-10, MS-10E
LTC3808	PLL, Selectable Spread Spectrum, Tracking, Power Good	4x3 DFN-14, SSOP-16

Applications

1- or 2-Cell Lithium-Ion Powered Devices
Portable Instruments
Distributed DC Power Systems

Part Models: 4
1ku List Price: Starting From $3.02

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
LTC3809EDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3809EDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3809EMSE#PBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3809EMSE#TRPBF	10-Lead MSOP w/ EP	Material Declaration Reliablity Data	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
LTC3809EMSE#PBF	PRODUCTION
LTC3809EMSE#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0130_Form Material_Report
LTC3809EMSE#PBF	PRODUCTION
LTC3809EMSE#TRPBF	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
Digital Power System Managers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Multiple Output Buck Regulators 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Silicon Oscillators 2
LTC6908		Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation

Tools & Simulations

LTspice 1

LTC3809 - Step-Down (Buck) Regulators

Models for the following parts are available in LTspice:

LTC3809
LTC3809-1

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.

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Part Details

Documentation

Data Sheet 1

Reliability Data 1

Design Note 1