LT8642-1

Name: LT8642-1
Brand: Analog Devices
Price: 4.00 USD
Availability: InStock

RECOMMENDED FOR NEW DESIGNS

18V, 10A Synchronous Step-Down Silent Switcher

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $4.00

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Overview

Silent Switcher^® Architecture
- Ultralow EMI Emissions
- 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 I_Q Regulating 12V_IN to 1.2V_OUT
- Output Ripple: <10mV_P-P
Fast Minimum Switch On-Time: 20ns
Low Dropout Under All Conditions: 50mV at 1A
Forced Continuous Mode
Adjustable and Synchronizable: 200kHz to 3MHz
Output Soft-Start and Power Good
Small 20-Lead 3mm × 4mm LQFN Package

Part Models: 2
1ku List Price: Starting From $4.00

Documentation

Data Sheet 1

LT8642-1: 18V, 10A Synchronous Step-Down Silent Switcher Data Sheet (Rev.0) 02/08/2022

User Guide 1

DC3162A - Demo Manual (Rev.0) 07/28/2022

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
LT8642EV-1#PBF	20-Lead (3mm × 4mm × 0.95mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8642EV-1#TRPBF	20-Lead (3mm × 4mm × 0.95mm)	Material Declaration Reliability Report 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 1

LT8642-1 - Step-Down (Buck) Regulators

Models for the following parts are available in LTspice:

LT8642-1
LT8642S

LTpowerCAD

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.

Evaluation Kits

LT8642-1 | 18V, 10A Synchronous Step-Down Silent Switcher

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Product Details

Demonstration circuit 3162A is a 18V, 10A synchronous step-down Silent Switcher^® with spread spectrum frequency modulation featuring the LT8642-1. The demo board is designed for 1.2V output from a 2.8V to 18V input. The LT8642-1 is a compact, low emission, high efficiency, and high speed synchronous monolithic stepdown switching regulator. Special Silent Switcher architecture minimizes EMI emissions. Selectable spread spectrum mode can further improve EMI performance. Fast minimum on-time of 20ns enables high V_IN to low V_OUT conversion at high frequency.

The LT8642-1 switching frequency can be programmed either via a resistor or external clock over a 200kHz to 3MHz range. The default frequency of demo circuit 3162A is 2MHz. The LT8642-1 SYNC/MODE pin on the demo board is grounded (JP1 at BURST position) by default for low ripple Burst Mode^® operation. Spread spectrum mode and forced continuous mode can be selected respectively by moving JP1 shunt. To synchronize to an external clock, move JP1 to FCM/SYNC and apply the external clock to the SYNC terminal.

The LT8642-1 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 3162A. The LT8642-1 is assembled in a 3mm × 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.