What Are the Key Technical Specifications of the LTM4644IY#PBF

The LTM4644IY#PBF delivers four independent outputs, each supplying up to 4A continuous current. It accepts input voltages from 4V to 14V and provides adjustable outputs from 0.6V to 5.5V. The compact 77-lead BGA package measures only 15mm x 9mm x 5.01mm, saving valuable board space. Key features include overvoltage, overcurrent, and temperature protection, as well as the ability to parallel outputs for higher current needs.

These specifications help engineers optimize power density, improve thermal management, and simplify PCB layout in demanding applications.

Key Takeaways

• The LTM4644IY#PBF provides four independent outputs, each delivering up to 4A continuous current with adjustable voltages from 0.6V to 5.5V.

• It supports a wide input voltage range from 4V to 14V, making it suitable for many power systems and applications.

• The compact 77-lead BGA package saves board space and improves thermal management for reliable operation in tight designs.

• Built-in protections like overcurrent, overvoltage, and overtemperature keep the module and system safe under stress.

• Channels can be paralleled to deliver up to 16A total, supporting high-current needs while maintaining high efficiency up to 94%.

LTM4644IY#PBF Specifications

Voltage Range

The LTM4644IY#PBF supports a wide input voltage range from 4V to 14V. This flexibility allows engineers to use the module in systems powered by standard 5V, 9V, or 12V rails. Each output channel can be adjusted from 0.6V to 5.5V. This range covers most digital and analog circuits, making the module suitable for a variety of applications.

Output Current

Each of the four channels delivers up to 4A of continuous output current. The module can handle short bursts up to 5A per channel. For higher current needs, users can connect multiple outputs in parallel, reaching up to 16A total. This feature helps designers meet demanding power requirements without adding extra modules.

The LTM4644IY#PBF stands out among similar power modules for its high output current per channel and multi-channel design.

Efficiency

The LTM4644IY#PBF achieves high efficiency across a wide load range. Its integrated design reduces power loss and heat generation. High efficiency helps maintain stable operation and extends the lifespan of system components. This performance is especially important in compact or high-density designs where thermal management is critical.

Package

The module comes in a compact 77-lead BGA package. Its dimensions are 15mm x 9mm x 5.01mm. This small footprint saves valuable board space and simplifies layout. The BGA package also improves thermal performance by allowing efficient heat transfer to the PCB.

Protection Features

The LTM4644IY#PBF includes several built-in protection features to ensure safe and reliable operation:

• Overcurrent protection (OCP) prevents damage from sudden load changes.

• Overtemperature protection (OTP) keeps the device safe during thermal stress.

• Overvoltage protection (OVP) guards against voltage spikes.

These features help protect both the module and the system it powers.

The parallel output capability allows the LTM4644IY#PBF to deliver up to 16A by combining channels. This function supports high-current applications while maintaining efficiency and a compact size. The module integrates all necessary components, making it ideal for powering FPGAs, DSPs, and ASICs in demanding environments.

Configuration

Channel Setup

Engineers can configure each channel of the LTM4644IY#PBF independently. The module provides four output channels, which can operate separately or in parallel. When higher current is needed, designers can connect two or more channels together. This parallel configuration allows the system to deliver up to 16A, supporting demanding loads such as FPGAs or ASICs. Each channel includes dedicated output and sense pins, making setup flexible for different power rail requirements.

Tip: Use remote sense pins (SEN1 to SEN4) to improve voltage accuracy at the load, especially when long PCB traces are present.

Output Adjustment

Each output channel offers adjustable voltage settings. Engineers can set the output voltage for each channel between 0.6V and 5.5V. This adjustment uses the output pins (VOUT1 to VOUT4) and sense pins for remote sensing. The wide adjustment range supports a variety of digital and analog circuits. For precise voltage configuration, consult the official datasheet for recommended resistor values and setup instructions.

PCB Layout

Proper PCB layout ensures optimal performance and reliability. Designers should follow these best practices:

• Place components carefully to optimize signal integrity and thermal paths.

• Route traces thoughtfully to support efficient current flow and reduce noise.

• Use large copper areas under the module and thermal vias to manage heat.

• Provide stable input voltage and strong ground connections.

• Use remote sensing to compensate for voltage drops in traces.

• Consider airflow and thermal management, especially in compact designs.

• Synchronize switching frequency with the SYNC pin to reduce EMI if needed.

Note: Always refer to the datasheet for detailed layout guidelines and application circuit diagrams.

By following these configuration steps and layout tips, engineers can maximize the performance and reliability of their power system.

Applications

Typical Uses

The LTM4644IY#PBF serves a wide range of industries and devices. Its compact size and high efficiency make it a strong choice for modern electronics. The table below shows common application scenarios and their benefits:

The module’s versatility helps engineers address power needs in both consumer and industrial products.

Multi-Rail Systems

Many advanced systems require several voltage rails to power different components. The LTM4644IY#PBF provides four independent output channels, each delivering up to 4A. This design supports simultaneous power delivery to processors, memory, and other critical parts. High efficiency, up to 94%, reduces heat and energy loss. Channel paralleling allows engineers to combine outputs for higher current, supporting demanding loads. The module’s precise voltage regulation and advanced current mode control ensure stable operation, even when loads change quickly. Power sequencing and fault protection features add reliability, making the module a trusted choice in data centers, telecom, and industrial automation.

Space-Constrained Designs

Space often limits design choices in portable and compact devices. The LTM4644IY#PBF addresses this challenge with its small 15 mm x 9 mm BGA package and low profile. Four outputs in one module reduce the need for multiple converters, saving board space. Surface mount capability and integrated components simplify assembly and layout. The module operates reliably from -40°C to 125°C, making it suitable for aerospace, defense, and automotive environments. Its compact footprint and robust performance help engineers create smaller, lighter, and more efficient products.

Performance

LTM4644IY#PBF Features

The LTM4644IY#PBF stands out in the power module market with its combination of efficiency, flexibility, and robust design. Engineers benefit from features that support demanding applications and simplify system integration. The table below highlights key features that differentiate this module:

The module’s advanced current mode control ensures fast response to load changes, which is critical for sensitive electronics.

Thermal Management

Thermal performance remains a top priority in high-density power designs. The LTM4644IY#PBF uses an integrated µModule package that spreads heat efficiently and prevents hotspots. This design keeps the module cool, even under heavy loads. Engineers can further improve thermal management by using short, wide traces for high-current paths and placing capacitors close to the module. In real-world telecom systems, this approach has reduced facility cooling costs by up to 15%. The compact package also helps maintain stable temperatures in tight spaces, supporting long-term reliability.

Scalability

System designers often need flexible solutions for multi-rail or high-current applications. The LTM4644IY#PBF offers four independent step-down regulators in one compact package. Each channel delivers up to 4A, and users can parallel channels to achieve 8A or more for a single rail. This scalability supports a wide range of applications, from FPGAs to high-current processors. The integrated design includes all key components, which simplifies layout and reduces development time. The module’s RoHS-compliant packaging also meets global environmental standards.

Engineers can quickly adapt the module for new projects, saving time and reducing risk.

The LTM4644IY#PBF offers engineers a quad output regulator with 4A per channel, wide input and output voltage ranges, and high efficiency up to 94%. Key features include a compact BGA-77 package, integrated inductors, precise voltage regulation, and robust protection.

These advantages simplify design, save board space, and ensure reliable power delivery in data centers, telecom, and industrial systems.

Next steps for designers:

1. Review the datasheet for detailed application circuits.

2. Connect VIN, VOUT, and GND pins as recommended.

3. Verify part authenticity before integration.

FAQ

What is the maximum output current if channels are paralleled?

When all four channels connect in parallel, the LTM4644IY#PBF can deliver up to 16A continuous output. This setup supports high-current loads like FPGAs or ASICs.

Does the LTM4644IY#PBF require external components?

The module integrates most key components, including inductors and MOSFETs. Designers only need to add input/output capacitors and a few resistors for voltage setting.

How does the module protect against faults?

The LTM4644IY#PBF features overcurrent, overvoltage, and overtemperature protection. These functions help prevent damage to both the module and the system.

Can engineers synchronize the switching frequency?

Yes. The SYNC pin allows synchronization with an external clock. This feature helps reduce EMI and supports multi-module designs.

Is the LTM4644IY#PBF suitable for automotive or industrial use?

The module operates from -40°C to 125°C, making it ideal for harsh environments.

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