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LTM4644MPY#PBF

DC DC CONVERTER 4X0.6-5.5V

Part Number: LTM4644MPY#PBF

Manufacturer: Analog Devices Inc.

Category: Voltage Regulators - DC DC Switching Regulators

Package: 77-BBGA Module

Datasheet:: LTM4644MPY#PBF.pdf

Description: DC DC CONVERTER 4X0.6-5.5V

Select Quantity Stock: 5,609

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PRODUCT INFORMATION

Product Details

PRODUCT TECHNICAL REFERENCE

LTM4644MPY#PBF Quad 4A Output DC/DC Step-Down µModule Regulator

A comprehensive technical overview of the LTM4644MPY#PBF, a quad DC/DC step-down µModule regulator from Analog Devices featuring 4A continuous output current per channel, wide 4V to 14V input range, 0.6V to 5.5V adjustable output voltage, and up to 16A capability when outputs are paralleled. Covers device function, core features, electrical specifications, 77-lead BGA package, pin configuration, typical applications, and replacement selection guidance.

Analog Devices 77-BGA (15mm × 9mm) 4V to 14V

Device Classification Quad DC/DC Step-Down µModule Regulator

Part Number: LTM4644MPY#PBF

Mounting Type: Surface Mount

Operating Temperature Range: -55°C to +125°C

PRODUCT OVERVIEW

What Is the LTM4644MPY#PBF?

LTM4644MPY#PBF is a quad DC/DC step-down µModule (micromodule) regulator from Analog Devices, capable of delivering 4A continuous output current per channel. The device integrates switching controllers, power MOSFETs, inductors, and supporting components within a single package, simplifying the design and reducing the external component count.

The LTM4644MPY#PBF operates with an input voltage range of 4V to 14V, or 2.375V to 14V with an external bias supply. The output voltage is adjustable from 0.6V to 5.5V, making it suitable for a wide variety of point-of-load applications. The four channels can be paralleled to provide up to 16A of output current for a single rail, offering flexibility for high-current loads.

The device features current-mode control for fast transient response, output voltage tracking, external frequency synchronization, and comprehensive protection including overcurrent, overtemperature, and overvoltage protection. The MP grade variant is rated for operation from –55°C to +125°C, making it suitable for demanding military and high-reliability applications. The LTM4644MPY#PBF is offered in a 77-lead BGA package with a 15.00mm × 9.00mm footprint and is in active production.

Complete µModule Regulator Integrates switching controllers, power FETs, inductors, and support components in a single BGA package.

Quad 4A Outputs with Paralleling Capability Four independent 4A channels can be paralleled for up to 16A total output current.

MP-Grade Extended Temperature Range –55°C to 125°C operating junction temperature for military and high-reliability applications.

DEVICE HIGHLIGHTS

Key Features and Benefits of LTM4644MPY#PBF

Quad 4A Output with Paralleling Capability

Four independent 4A output channels can be paralleled in an array for up to 16A total output current, providing flexibility for high-current and multi-rail applications.

Wide Input & Output Range

Operates from 4V to 14V input (2.375V to 14V with external bias) and supports an adjustable output voltage from 0.6V to 5.5V.

Fully Integrated µModule Solution

Package includes switching controllers, power FETs, inductors, and support components, minimizing external component count and simplifying PCB layout.

High Efficiency & Fast Transient Response

Current-mode control delivers fast transient response with up to 5.5W power dissipation capability (TA = 60°C, 200 LFM, no heatsink).

Comprehensive Protection Features

Built-in overcurrent protection (OCP), overtemperature protection (OTP), and overvoltage protection (OVP) ensure robust operation in demanding environments.

MP-Grade Extended Temperature Range

MP-Grade version rated for –55°C to 125°C operating junction temperature, suitable for military, aerospace, and harsh-environment applications.

REFERENCE DATA

Technical Specifications for LTM4644MPY#PBF

Part Number	LTM4644MPY#PBF	Manufacturer	Analog Devices
Device Type	Quad DC/DC Step-Down µModule Regulator	Topology	Buck (Step-Down)
Number of Outputs	4	Output Current (Per Channel)	4A Continuous, 5A Peak
Total Output Current (Paralleled)	Up to 16A	Input Voltage Range	4V to 14V
Input Voltage Range (with External Bias)	2.375V to 14V	Output Voltage Range	0.6V to 5.5V
Output Voltage Accuracy	±1.5%	Switching Frequency	1MHz
Ripple Noise	5mVp-p	Power Dissipation	Up to 5.5W (TA = 60°C, 200 LFM, no heatsink)
Package / Case	77-BBGA Module	Supplier Device Package	77-BGA (15mm × 9mm)
Package Body Size	15.00mm × 9.00mm	Package Height	5.01mm
Mounting Type	Surface Mount	Pin Count	77
Operating Temperature (MP-Grade)	-55°C to +125°C	Moisture Sensitivity Level	MSL 3 - 168 hours
Protection Features	OCP, OTP, OVP	Control Features	Current Mode Control, Output Voltage Tracking, External Frequency Synchronization
RoHS	ROHS3 Compliant	REACH Status	REACH Unaffected
SVHC	No SVHC	Packaging	Tray
Tray Quantity	170 per Tray	Product Status	Active

Electrical values shown above are reference values. Test conditions, limits, and guaranteed performance should always be confirmed from the current official manufacturer datasheet before design or production use. MP-Grade specifications apply over the junction temperature range of –55°C to 125°C.

DESIGN REFERENCE

Circuit Considerations for LTM4644MPY#PBF

Output Configuration & Key Features

The LTM4644MPY#PBF offers flexible output configuration:

Independent Operation: Four independent outputs, each adjustable from 0.6V to 5.5V
Parallel Operation: Outputs can be paralleled in an array for up to 16A capability
Current-Mode Control: Fast transient response with internal compensation
Output Voltage Tracking: Supports tracking for sequencing requirements
External Frequency Synchronization: Synchronize switching frequency to an external clock
Internal Temperature Sensing Diode: Provides die temperature monitoring

PCB and Power-Supply Guidance

µModule regulator performance depends on layout and component selection:

Input and Output Capacitors: Only bulk input and output capacitors are needed; internal compensation eliminates the need for complex external networks
External Bias: For input voltages below 4V, an external bias supply (2.375V to 14V) can be used
Thermal Management: The BGA package is rated for up to 5.5W power dissipation at TA = 60°C with 200 LFM airflow; ensure adequate PCB copper area and thermal vias for heat dissipation
BGA Layout: Follow the recommended BGA footprint and solder pad design from the official datasheet to ensure reliable solder joint formation
PCB Layout: Keep high-current traces short and wide to minimize parasitic resistance and inductance
Verify the recommended PCB footprint from the official datasheet prior to production

77-LEAD BGA (15mm × 9mm)

Pin Configuration Reference for LTM4644MPY#PBF

LTM4644

BGA BOTTOM VIEW

Confirm package orientation and ball numbering against the official package drawing before PCB layout. The BGA package has 77 balls arranged in a 15.00mm × 9.00mm grid. This table lists all balls in alphanumeric order (A1 through G7). For complete details, refer to the official Analog Devices LTM4644 datasheet.

A1 VOUT1 Output Voltage Channel 1

A2 SVIN1 Sense Input Voltage Channel 1

A3 MODE1 Mode Select Channel 1

A4 RUN1 Enable Pin Channel 1 (Active High)

A5 COMP1 Compensation Pin Channel 1

A6 INTVCC1 Internal Regulator Output Channel 1

A7 GND Ground

B1 PGOOD2 Power Good Indicator Channel 2 (Open-Drain Output)

B2 PGOOD1 Power Good Indicator Channel 1 (Open-Drain Output)

B3 INTVCC2 Internal Regulator Output Channel 2

B4 PGOOD3 Power Good Indicator Channel 3 (Open-Drain Output)

B5 TEMP Internal Temperature Sensor Diode Output

B6 INTVCC3 Internal Regulator Output Channel 3

B7 PGOOD4 Power Good Indicator Channel 4 (Open-Drain Output)

C1 CLKOUT Clock Output (External Frequency Synchronization Output)

C2 FB1 Feedback Pin Channel 1 (Resistor Divider to Ground)

C3 TRACK/SS1 Tracking/Soft-Start Channel 1

C4 GND Ground

C5 CLKIN External Frequency Synchronization Input

C6 TRACK/SS2 Tracking/Soft-Start Channel 2

C7 FB2 Feedback Pin Channel 2 (Resistor Divider to Ground)

D1 RUN2 Enable Pin Channel 2 (Active High)

D2 SGND Signal Ground

D3 TRACK/SS3 Tracking/Soft-Start Channel 3

D4 FB3 Feedback Pin Channel 3 (Resistor Divider to Ground)

D5 TRACK/SS4 Tracking/Soft-Start Channel 4

D6 INTVCC4 Internal Regulator Output Channel 4

D7 RUN4 Enable Pin Channel 4 (Active High)

E1 MODE2 Mode Select Channel 2

E2 SVIN2 Sense Input Voltage Channel 2

E3 COMP2 Compensation Pin Channel 2

E4 RUN3 Enable Pin Channel 3 (Active High)

E5 FB4 Feedback Pin Channel 4 (Resistor Divider to Ground)

E6 MODE3 Mode Select Channel 3

E7 SVIN3 Sense Input Voltage Channel 3

F1 COMP3 Compensation Pin Channel 3

F2 COMP4 Compensation Pin Channel 4

F3 MODE4 Mode Select Channel 4

F4 SVIN4 Sense Input Voltage Channel 4

F5 VIN4 Input Power Channel 4 (4V to 14V)

F6 VIN1 Input Power Channel 1 (4V to 14V)

F7 GND Ground

G1 GND Ground

G2 GND Ground

G3 VIN3 Input Power Channel 3 (4V to 14V)

G4 VIN2 Input Power Channel 2 (4V to 14V)

G5 VOUT4 Output Voltage Channel 4 (0.6V to 5.5V)

G6 VOUT3 Output Voltage Channel 3 (0.6V to 5.5V)

G7 VOUT2 Output Voltage Channel 2 (0.6V to 5.5V)

APPLICATION AREAS

Typical Applications for LTM4644MPY#PBF

FPGA, DSP & ASIC Power

Ideal for multi-rail point-of-load regulation for FPGAs, DSPs, and ASICs requiring multiple voltage rails with high current capability.

High-Density Multi-Rail Systems

Four independent outputs in a compact package make this device suitable for space-constrained, high-density power distribution systems.

Military & Aerospace

MP-Grade extended temperature range (–55°C to 125°C) qualifies the device for military, aerospace, and high-reliability applications.

Industrial & Test Equipment

Robust protection features and wide operating temperature range suit industrial automation and test instrumentation.

Automotive Systems

Suitable for automotive infotainment, ADAS, and other systems requiring reliable power conversion under harsh conditions.

Point-of-Load Regulation

Provides local regulation for distributed power architectures, reducing voltage drops and improving transient response for sensitive loads.

REPLACEMENT GUIDANCE

Selecting an Alternative for LTM4644MPY#PBF

A replacement for the LTM4644MPY#PBF should not be selected solely by product category. The electrical characteristics, package, and pin configuration must be evaluated against the specific circuit requirements. The following alternatives are documented in the official Analog Devices product pages and datasheets.

Outputs: 4 channels, 4A each

Input voltage range: 4V–14V (2.375V–14V with external bias)

Output voltage range: 0.6V–5.5V

Package: 77-BGA (15mm × 9mm)

Temperature range: –55°C to 125°C (MP-Grade)

Paralleling: Up to 16A capability

Protection: OCP, OTP, OVP

Features: Current-mode control, tracking, synchronization

Family alternatives:

Part Number	Temperature Grade	Temperature Range	Packaging	Carrier Quantity
LTM4644MPY#PBF	MP-Grade	-55°C to 125°C	Tray	170
LTM4644IY#PBF	I-Grade	-40°C to 125°C	Tray	170
LTM4644EY#PBF	E-Grade	-40°C to 125°C	Tray	170
LTM4644MPY-1#PBF	MP-Grade	-55°C to 125°C	Tray	170

All alternative part numbers listed above are documented in the official Analog Devices product pages. The LTM4644MPY#PBF is the MP-Grade (–55°C to 125°C) version in 77-lead BGA package with tray packaging (170 units per tray). For I-Grade (–40°C to 125°C) applications, consider LTM4644IY#PBF. For E-Grade (–40°C to 125°C) applications, consider LTM4644EY#PBF. For the -1 variant with different internal feedback divider configuration, consider LTM4644MPY-1#PBF. Select based on temperature grade, package, and packaging requirements.

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MANUFACTURER INFORMATION

Analog Devices

The LTM4644 (LTM4644MPY#PBF) belongs to the LTM4644 family of quad DC/DC step-down µModule regulators from Analog Devices. The device integrates switching controllers, power FETs, inductors, and support components in a single BGA package, simplifying power supply design. The MP-Grade version is 100% tested and guaranteed over the –55°C to 125°C operating junction temperature range for demanding military, aerospace, and harsh-environment applications. The LTM4644 family is widely used in FPGA, DSP, and ASIC power applications, as well as high-density multi-rail systems.

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Technical Information Disclaimer

This technical guide is provided for product identification and preliminary reference only. Electrical limits, package dimensions, pin configuration, product status, and application suitability must be verified using current official manufacturer documentation before design, procurement, or production.

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LTM4644MPY#PBF Technical Information

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Specifications

Product Attribute: Attribute Value

Part Number: LTM4644MPY#PBF

Manufacturer: Analog Devices Inc.

Package: 77-BBGA Module

Series: -

Package/Case: 77-BBGA Module

Packaging: Tray

Product Status: Active

Function: ITE (Commercial)

Output Configuration: -

Topology: -

Output Type: -

Number of Outputs: 4

Voltage - Input (Min): 4V

Voltage - Input (Max): 14V

Voltage - Output (Min/Fixed): 0.6V~5.5V

Voltage - Output (Max): -

Current - Output: 4A, 4A, 4A, 4A

Frequency - Switching: -

Synchronous Rectifier: -

Operating Temperature: -55°C ~ 125°C

Grade: -

Qualification: -

Mounting Type: Surface Mount

Supplier Device Package: 77-BGA (15x9)

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Electronic component inventory and prices may change frequently. Displayed values are references, and final stock and pricing will be confirmed in the quotation.

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6. What is the return or replacement process for LTM4644MPY#PBF?

Contact our sales team within the agreed period if there are quantity differences, incorrect items or clear external defects. Products should remain unused and in their original packaging.

7. Can I request technical support for LTM4644MPY#PBF?

Yes. Contact our team for datasheets, package details, product specifications, alternative parts and sourcing assistance.

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LTM4644MPY#PBF Procurement and Technical Support

LTM4644MPY#PBF is manufactured by Analog Devices Inc.. This page provides purchasing information including manufacturer, category, package, datasheet, stock reference, price reference and product specifications.

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Part Number: LTM4644MPY#PBF

Manufacturer: Analog Devices Inc.

Package: 77-BBGA Module

Category: Voltage Regulators - DC DC Switching Regulators

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