LTC3869

RECOMMENDED FOR NEW DESIGNS

Dual, 2-Phase Synchronous Step-Down DC/DC Controllers

Data Sheet Product Selection Table

Part Models: 10
1ku List Price: Starting From $3.19

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Part Details

Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
Accurate Multiphase Current Matching
R_SENSE or DCR Current Sensing
±0.75% 0.6V Output Voltage Accuracy
Phase-Lockable Fixed Frequency 250kHz to 780kHz
High Efficiency: Up to 95%
Dual N-channel MOSFET Synchronous Drive
Wide V_IN Range: 4V to 38V (40V Max) Operation
Wide V_OUT Range: 0.6V to 12.5V Operation
Adjustable Soft-Start Current Ramping or Tracking
Foldback Output Current Limiting
Output Overvoltage Protection
Power Good Output Voltage Monitor
5V Low Dropout Regulator
Small 28-Lead QFN and Narrow SSOP Packages

Part Models: 10
1ku List Price: Starting From $3.19

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
LTC3869EUF#PBF	28-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3869EUF#TRPBF	28-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3869EUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3869EUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3869IGN-2#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3869IGN-2#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3869IUF#PBF	28-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3869IUF#TRPBF	28-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3869IUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3869IUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC3869EUF#PBF	PRODUCTION
LTC3869EUF#TRPBF	PRODUCTION
LTC3869EUFD#PBF	PRODUCTION
LTC3869EUFD#TRPBF	PRODUCTION
LTC3869IUF#PBF	PRODUCTION
LTC3869IUF#TRPBF	PRODUCTION
LTC3869IUFD#PBF	PRODUCTION
LTC3869IUFD#TRPBF	PRODUCTION
Dec 28, 2020 - 20_0245 Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)
		PCN20_0245_Form Material_Report Delta Qualification Matrix Other Qualification Results Summary
LTC3869EUF#PBF	PRODUCTION
LTC3869EUF#TRPBF	PRODUCTION
LTC3869EUFD#PBF	PRODUCTION
LTC3869EUFD#TRPBF	PRODUCTION
LTC3869IGN-2#PBF	PRODUCTION
LTC3869IGN-2#TRPBF	PRODUCTION
LTC3869IUF#PBF	PRODUCTION
LTC3869IUF#TRPBF	PRODUCTION
LTC3869IUFD#PBF	PRODUCTION
LTC3869IUFD#TRPBF	PRODUCTION
Aug 10, 2022 - 22_0177 Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL
		PCN22_0177_Form Material_Report Delta Qualification Matrix
LTC3869IGN-2#PBF	PRODUCTION
LTC3869IGN-2#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
Dual-Supply Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Multiple Output Buck Regulators 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Tools & Simulations

LTspice 5

Models for the following parts are available in LTspice:

LTC3869
LTC3869-2

LTpowerCAD 4

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

LTC3869IGN-2 Demo Board | VIN = 4.5V to 26V, VOUT1 = 3.3V @ 5A, VOUT2 = 2.5V @ 5A, with DCR Sense

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Product Details

Demonstration circuit 1798A is a Dual Output, Dual Phase 5A Synchronous Buck Converter featuring the LTC3869IGN-2. It provides 2.5V/5A and 3.3V/5A outputs. The input voltage range is 4.5V to 26V. DC1798A-A has an on-board sense resistor for current feedback, while the DC1798A-B is configured with a DCR sense circuit that allows the converter to use the inductors DCR as the sense element instead of the on-board sense resistors to save cost and board space and improves efficiency.

Resources

DC1798A - Schematic
3/28/2012

DC1798A- Design Files
7/15/2011

DC1798A - Demo Manual
7/15/2011

LTC3869EUFD Demo Board | VIN = 4.5V to 14V, VOUT1 = 1.5V @15A, VOUT2 = 1.2V @ 15A, with RSENSE

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Product Details

Demonstration circuit 1807A is a dual output, dual phase synchronous buck converter featuring the LTC3869EUFD. The input voltage range is 4.5V to 14V, output voltages and currents are 1.5V/15A and 1.2V/15A. Two versions of the board are available. DC1807A-A has an on-board sense resistor for current feedback, while the DC1807A-B is configured with a DCR sense circuit that allows the converter to use the inductors DCR as the sense element instead of the on-board sense resistors to save cost and board space and improves efficiency.