LT8640A

Name: LT8640A
Brand: Analog Devices
Price: 3.39 USD
Availability: InStock

RECOMMENDED FOR NEW DESIGNS

42V, 5A/8A Peak Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

Data Sheet (Rev. A) Product Selection Table

Part Models: 8
1ku List Price: Starting From $3.39

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Overview

Silent Switcher^® Architecture
- Ultralow EMI Emissions
- Spread Spectrum Frequency Modulation
High Efficiency at High Frequency
- Up to 96% Efficiency at 1MHz, 12V_IN to 5V_OUT
- Up to 95% Efficiency at 2MHz, 12V_IN to 5V_OUT
Wide Input Voltage Range: 3.4V to 42V
5A Maximum Continuous, 8A Peak Transient Output
Ultralow Quiescent Current Burst Mode^® Operation
- 2.5μA IQ Regulating 12V_IN to 3.3V_OUT
- Output Ripple < 10mV_P-P

Fast Minimum Switch On-Time: 30ns
Low Dropout Under All Conditions: 100mV at 1A
Available in Fixed 3.3V Output
Forced Continuous Mode
Safely Tolerates High Reverse Current
Adjustable and Synchronizable: 200kHz to 3MHz
Peak Current Mode Operation
Output Soft-Start and Tracking
Small 18-Lead 3mm × 4mm Side Solderable QFN with Improved Solder Joint Reliability
AEC-Q100 Qualified for Automotive Applications

Part Models: 8
1ku List Price: Starting From $3.39

Documentation

Informational 1

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
LT8640AJUDCM#PBF	20(18)-Lead Plastic Side Wettable QFN (3mm × 4mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8640AJUDCM#TRPBF	20(18)-Lead Plastic Side Wettable QFN (3mm × 4mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8640AJUDCM#WPBF	20(18)-Lead Plastic Side Wettable QFN (3mm × 4mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8640AJUDCM#WTRPBF	20(18)-Lead Plastic Side Wettable QFN (3mm × 4mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8640AJUDCM-3.3#PBF	20(18)-Lead Plastic Side Wettable QFN (3mm × 4mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8640AJUDCM-3.3#TRPBF	20(18)-Lead Plastic Side Wettable QFN (3mm × 4mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8640AJUDCM-3.3#WPBF	20(18)-Lead Plastic Side Wettable QFN (3mm × 4mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT8640AJUDCM-3.3#WTRPBF	20(18)-Lead Plastic Side Wettable QFN (3mm × 4mm)	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

Models for the following parts are available in LTspice:

LT8640
LT8640-1
LT8640A
LT8640S-2
LT8640SA

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

LT8640
LT8640S
LT8640SA

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

LT8640A | 42V, 5A (8A Peak) Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

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Product Details

Demonstration circuit 3099A is a 42V, 5A synchronous step-down Silent Switcher^® with spread spectrum frequency modulation featuring the LT8640A. The demo board is designed for 5V output from a 5.7V to 42V input. Meanwhile the LT8640A can operate down to 3.4V inputs. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8640A is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic stepdown switching regulator. The integrated power switches and inclusion of all necessary circuitry reduce the components count and solution size. Special Silent Switcher architecture minimizes EMI emissions. Selectable spread spectrum mode can further improve EMI performance. Ultralow 2.5μA quiescent current in Burst Mode^® operation achieves high efficiency at very light loads. Fast minimum on-time of 30ns enables high V_IN to low V_OUT conversion at high frequency.

The LT8640A switching frequency can be programmed either via oscillator resistor or external clock over a 200kHz to 3MHz range. The default frequency of demo circuit 3099A is 2MHz. The LT8640A 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 LT8640A 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 3099A. The LT8640A is assembled in a 3mm × 4mm plastic QFN package with exposed pad 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 and Peak Output Current.

Resources

DC3099A - Schematic
7/28/2022

DC3099A - Design Files
7/28/2022

DC3099A - Demo Manual (Rev.0)
7/28/2022

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LT8640A

Overview

Documentation

Data Sheet 1

User Guide 1

Application Note 1