LTM4640

RECOMMENDED FOR NEW DESIGNS

20V_IN, 20A Step-Down DC-to-DC μModule Regulator

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $13.75

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Overview

Complete Solution in <1cm2 (Single-Sided PCB) or 0.5cm2 (Dual-Sided PCB)
Wide Input Voltage Range: 3.1V to 20V
0.6V to 3.3V Output Voltage
Up to 20A DC output current
±1.5% Maximum Total DC Output Voltage Error
Differential Remote Sensing Amplifier
Fast Transient Response
External Frequency Synchronization

Multiphase Parallel Current Sharing with upnto 4 × LTM4640s
Power Good Indicator
Overvoltage and Overtemperature Protection
49-Pin, 6.25mm × 6.25mm × 5.07mm, BGA package
Pin compatible with LTM4626, LTM4638, and LTM4657

The LTM4640 is a complete 20A step-down switching mode power μModule® (micromodule) regulator in a tiny 6.25mm × 6.25mm × 5.07mm BGA package. The package includes the switching controller, the power MOSFETs, an inductor, and the supporting components. Operating over an input voltage range of 3.1V to 20V, the LTM4640 supports an output voltage range of 0.6V to 3.3V, set by a single external resistor. Its high-efficiency design delivers up to 20A continuous output current. Only bulk input and output capacitors are needed.

The LTM4640 supports selectable discontinuousconduction mode (DCM) operation and output voltage tracking for supply rail sequencing. Its high switching frequency and controlled on-time valley current mode architecture enable a very fast transient response to line and load changes without sacrificing stability. Fault protection features include overvoltage and overtemperature protection.

The LTM4640 is available with a RoHS-compliant terminal finish.

APPLICATIONS

Telecom, Datacom, Networking, and Industrial Equipment
Medical Diagnostic Equipment
Data Storage Rack Units and Cards
Test and Debug Systems

Part Models: 2
1ku List Price: Starting From $13.75

Documentation

Data Sheet 1

LTM4640: 20V_IN, 20A Step-Down DC-to-DC μModule Regulator Data Sheet (Rev.0) 12/19/2024

User Guide 1

DC3107A User Guide: LTM4640 | 20V_IN, 20A Step-Down μModule Regulator (Rev.0) 12/19/2024

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
LTM4640EY#PBF	49-Ball Chip Scale Package Ball Grid Array [CSP_BGA]	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTM4640IY#PBF	49-Ball Chip Scale Package Ball Grid Array [CSP_BGA]	Material Declaration Reliablity Data 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

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

LTM4640

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

LTM4640 |20VIN, 20A Step-Down μModule Regulator

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Features and Benefits

Current Mode Control, Fast Transient Response
External Frequency Synchronization
Differential Remote Sensing

Product Details

The DC3107A evaluation board features the LTM®4640 μModule® (micromodule) regulator, a high performance, and high-efficiency step-down regulator. The LTM4640 is a complete DC-to-DC point-of-load (POL) regulator in a thermally enhanced 6.25mm × 6.25mm × 5.17mm BGA package. The LTM4640 has an operating input voltage range of 3.1V to 20V and provides an output current of up to 20A. The output voltage is programmable from 0.6V to 3.3V and can be remotely sensed. The stacked inductor design improves thermal dissipation and significantly reduces the package area. Output voltage tracking is available through the TRACK/ SS pin for supply rail sequencing. External clock synchronization is available through the SYNC/MODE pin. For high efficiency at low load currents, select discontinuous-conduction mode (DCM) operation using the MODE jumper (JP7) in less noise-sensitive applications. Refer to the LTM4640 data sheet and read this user guide before working on or modifying the DC3107A evaluation board.

Resources

DC3107A User Guide: LTM4640 | 20V_IN, 20A Step-Down μModule Regulator (Rev.0)
12/19/2024

DC3107A - Schematic
1/10/2025

DC3107A - Design Files
1/10/2025

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