LTM4639

RECOMMENDED FOR NEW DESIGNS

Low V_IN 20A DC/DC μModule (Power Module) Step-Down Regulator

Part Models: 3
1ku List Price: Starting From $22.90

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Overview

Complete 20A Switch Mode Power Supply
2.375V to 7V Input Voltage Range (V_IN < 4.5V, Need C_PWR Bias)
0.6V to 5.5V Output Voltage Range
±1.5% Maximum Total DC Output Voltage Error (–40°C to 125°C)
Differential Remote Sense Amplifier for Precision Regulation (V_OUT ≤ 3.3V)
Current Mode Control/Fast Transient Response
Parallel Multiphase Current Sharing (Up to 80A)
Frequency Synchronization
Selectable Pulse-Skipping or Burst Mode^® Operation
Soft-Start/Voltage Tracking
Up to 88% Efficiency (3.3V_IN, 1.5V_OUT)
Overcurrent Foldback Protection
Output Overvoltage Protection
Internal Temperature Monitor
Overtemperature Protection
15mm × 15mm × 4.92mm BGA Package

The LTM4639 is a complete 20A output high efficiency switch mode step-down DC/DC μModule (power module) regulator. Included in the package are the switching controller, power FETs, inductor and compensation components. Operating over an input voltage range from 2.375V to 7V, the LTM4639 supports an output voltage range of 0.6V to 5.5V, set by a single external resistor. Only a few input and output capacitors are needed.

Current mode operation allows precision current sharing of up to four LTM4639 regulators to obtain up to 80A output. High switching frequency and a current mode architecture enable a very fast transient response to line and load changes without sacrificing stability. The device supports frequency synchronization, multiphase/current sharing, Burst Mode operation and output voltage tracking for supply rail sequencing. A diode-connected PNP transistor is included for use as an internal temperature monitor. For up to 20V input operation, please see the LTM4637.

The LTM4639 is offered in a 15mm × 15mm × 4.92mm BGA package. The LTM4639 is RoHS compliant.

Applications

Telecom Servers and Networking Equipment
Industrial Equipment
Medical Systems
High Ambient Temperature Systems
3.3V Input Systems

Part Models: 3
1ku List Price: Starting From $22.90

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
LTM4639EY#PBF	133-Lead BGA (15mm x 15mm x 4.92mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTM4639IY	133-Lead BGA (15mm x 15mm x 4.92mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTM4639IY#PBF	133-Lead BGA (15mm x 15mm x 4.92mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jul 3, 2023 - 23_0094 LTM4637 and LTM4639 - FET and SUBSTRATE (BGA Package ONLY)
		PCN23_0094_Form Material_Report Qualification Results Summary
LTM4639EY#PBF	PRODUCTION
LTM4639IY	PRODUCTION
LTM4639IY#PBF	PRODUCTION
Jul 28, 2021 - 20_0245 Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)
		PCN20_0245_Form Material_Report Delta Qualification Matrix Other Qualification Results Summary
LTM4639EY#PBF	PRODUCTION
LTM4639IY	PRODUCTION
LTM4639IY#PBF	PRODUCTION
Jul 21, 2021 - 21_0159 Ink Mark to Laser Mark Conversion for µModule
		PCN21_0159_Form Material_Report Delta Qualification Matrix
LTM4639EY#PBF	PRODUCTION
LTM4639IY	PRODUCTION
LTM4639IY#PBF	PRODUCTION
Sep 28, 2020 - 20_0301 LTM4639- Notification of Qualification of New Mold Compound and Substrate Change
		PCN20_0301_Form Material_Report Qualification Results Summary
LTM4639EY#PBF	PRODUCTION
LTM4639IY	PRODUCTION
LTM4639IY#PBF	PRODUCTION
Feb 28, 2020 - 20_0123 Micro-Module, Test Site Transfer from Analog Devices Singapore to Analog Devices Penang, Malaysia
		PCN20_0123_Form Material_Report Test Correlation Report Other Qualification Results Summary
LTM4639EY#PBF	PRODUCTION
LTM4639IY	PRODUCTION
LTM4639IY#PBF	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Power System Management (PSM) & Sequencers 1
LTC2975	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Input Current and Energy Measurement

Tools & Simulations

LTspice 1

LTM4639/LT1935/LTC2997 Demo Circuit - High Efficiency 20A µModule Buck Regulator (2.4-7V to 1.2V @ 20A)

Models for the following parts are available in LTspice:

LTM4639

LTpowerCAD 1

LTM4639 Project - Low Vin, 20A Step-Down μModule Regulator (2.4-7V to 1.8V @ 20A)

Design tools for the following parts are available in LTpowerCAD:

LTM4639

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

LTM4639 Demo Board |μModule Buck, 2.375V ≤ VIN ≤ 7V, VOUT = 1.0V/1.2V/1.5V/1.8V @ 20A

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Product Details

Demonstration circuit 2166A features the LTM4639EY, a 20A high efficiency, switch mode step-down power μModule^® regulator. The input voltage range is from 2.375V to 7V. The output voltage range is 0.6V to 5.5V. Derating is necessary for certain V_IN, V_OUT, frequency and thermal conditions. The DC2166A offers the TRACK/SS pin allowing the user to program output tracking or soft-start period. The board operates in continuous conduction mode in heavy load conditions. For high efficiency at low load currents, the MODE jumper (JP3) selects pulse-skipping mode for noise sensitive applications or Burst Mode^® operation in less noise sensitive applications. There is an on board boost circuit using LT1935 to provide control power to LTM4639 when V_IN is less than 4.5V. LTM4639 has on board diode connected PNP transistors to monitor its internal temperature. A temperature sensor LTC2997 converts the internal temperature to an analog voltage output. The LTM4639 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit DC2166A.