LTM4640

RECOMMENDED FOR NEW DESIGNS

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

Analog Devices LTM4640 Product Info

10 February 2026 7

Features

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

Part details & applications

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

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