LT8642S

RECOMMENDED FOR NEW DESIGNS

18V, 10A Synchronous Step-Down Silent Switcher 2

Data Sheet (Rev. A) Product Selection Table

Part Models: 4
1ku List Price: Starting From $4.89

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Part Details

Silent Switcher^®2 Architecture
- Ultralow EMI Emissions On Any PCB
- Eliminates PCB Layout Sensitivity
- Internal Bypass Capacitors Reduce Radiated EMI
- Optional Spread Spectrum Modulation
High Efficiency at High Frequency
- Up to 96% Efficiency at 1MHz, 12V_IN to 3.3V_OUT
- Up to 95% Efficiency at 2MHz, 12V_IN to 3.3V_OUT
Wide Input Voltage Range: 2.8V to 18V

10A Output Current
External Compensation: Fast Transient Response and Current Sharing
Low Quiescent Current Burst Mode^® Operation
- 240µA IQ Regulating 12V_IN to 1.2V_OUT
- Output Ripple < 10mV_P-P
Fast Minimum Switch On-Time: 25ns
Low Dropout Under All Conditions: 50mV at 1A
Forced Continuous Mode
Adjustable and Synchronizable: 200kHz to 3MHz
Output Soft-Start and Power Good
Small 24-Lead 4mm × 4mm LQFN Package

Part Models: 4
1ku List Price: Starting From $4.89

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
LT8642SEV#PBF	24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8642SEV#TRPBF	24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8642SIV#PBF	24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT8642SIV#TRPBF	24-Lead LQFN (4mm x 4mm x 0.94mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 11, 2019 - 19_0067 Notification of Wafer Fab Location Change for 0.35 BCD Process
		PCN19_0067_Form Material_Report Delta Qualification Matrix Qualification Results Summary Detailed Parts List Other
LT8642SEV#PBF	PRODUCTION
LT8642SIV#PBF	PRODUCTION

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

Software Resources

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Tools & Simulations

LTspice 1

LT8642S - Step-Down (Buck) Regulators

Models for the following parts are available in LTspice:

LT8642-1
LT8642S

LTpowerCAD 1

LT8642S Project - DC2560A 3-18Vin to 1.2V/10A, 2MHz

Design tools for the following parts are available in LTpowerCAD:

LT8642S

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

18V, 10A Synchronous Step-Down Silent Switcher 2

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Product Details

Demonstration circuit 2560A is a 18V, 10A synchronous step-down Silent Switcher^®2 with spread spectrum frequency modulation featuring the LT8642S. The demo board is designed for 1.2V output from a 2.8V to 18V input. The LT8642S is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. The integrated bypass capacitors optimize all the fast current loops and make it easier to minimize EMI/EMC emissions by reducing layout sensitivity. Selectable spread spectrum mode can further improve EMI/EMC performance. Fast minimum on-time of 20ns enables high V_IN to low V_OUT conversion at high frequency.

The LT8642S switching frequency can be programmed either via a resistor or external clock over a 200kHz to 3MHz range. The default frequency of demo circuit 2560A is 2MHz. The SYNC pin on the demo board is grounded (JP1 at BURST position) by default for low ripple Burst Mode^® operation. To synchronize to an external clock, move JP1 to SYNC and apply the external clock to the SYNC terminal. Spread spectrum mode and forced continuous mode can be selected respectively by moving JP1 shunt.

The demo board has an EMI filter installed. This EMI filter can be included by applying the input voltage at the VIN_ EMI terminal.

The LT8642S data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this demo manual for demo circuit 2560A. The LT8643S is assembled in a 4mm × 4mm LQFN package with exposed pads for low thermal resistance. The layout recommendations for low EMI operation and maximum thermal performance are available in the data sheet section Low EMI PCB Layout and Thermal Considerations.

Resources

DC2560A - Demo Manual (Rev.A)
7/17/2018

DC2560A - Schematic
7/2/2018

DC2560A - Design Files
7/2/2018

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LT8642S

Part Details

Documentation

Data Sheet 1

User Guide 1

Technical Articles 1

LT Journal 1

Solutions Bulletin & Brochure 1

Book & eBook 1

Analog Dialogue 2

Webcast 1