LTM4644IY#PBF: Compact four-output power module suitable for high-density applications

LTM4644IY#PBF is an integrated DC/DC power module, which incorporates key components such as a controller, MOSFET, and inductor. It can independently output 4 adjustable voltages, with each channel capable of supporting a maximum current of 4A (peak 5A). Multiple channels can be connected in parallel to achieve a higher output current (up to 16A).

Features

Quad Output Step-Down µModule® Regulator with 4Aper Output

Wide Input Voltage Range: 4V to 14V

2.375V to 14V with External Bias

0.6V to 5.5V Output Voltage

4A DC, 5A Peak Output Current Each Channel

Up to 5.5W Power Dissipation (TA = 60°C, 200 LFM,No Heat Sink)

±1.5% Total Output Voltage Regulation

Current Mode Control, Fast Transient Response

Parallelable for Higher Output Current

Output Voltage Tracking

Internal Temperature Sensing Diode Output

External Frequency Synchronization

Overvoltage, Current and Temperature Protection

9mm × 15mm × 5.01mm BGA Package

ABSOLUTE MAXIMUM RATINGS

VIN, SVIN (Per Channel).............................. –0.3V to 15V

VOUT (Per Channel) (Note 3) ............–0.3V to SVIN or 6V

RUN (Per Channel)..................................... –0.3V to 15V

INTVCC (Per Channel) ............................... –0.3V to 3.6V

PGOOD, MODE, TRACK/SS,

FB (Per Channel)...................................–0.3V to INTVCC

CLKOUT (Note 3), CLKIN.......................–0.3V to INTVCC

Internal Operating Temperature Range (Note 2, 5)

E and I-Grade..................................... –40°C to 125°C

MP-Grade .......................................... –55°C to 125°C

Storage Temperature Range .................. –65°C to 150°C

Peak Solder Reflow Body Temperature ................. 245°C

Application

1. Multirail Point-of-Load Regulation

Modern electronic systems often require multiple independent voltage rails to power processors, memory, interfaces, analog front-ends, and other subsystems. The LTM4644IY#PBF offers a compact and efficient solution for point-of-load (PoL) regulation, delivering power directly at the load to minimize losses and optimize performance.

Key Advantages:

✅ Four Independent Outputs: Each of the four channels can be independently configured from 0.6V to 5.5V, covering a wide range of supply requirements

✅ Channel Parallelization: Channels can be combined to deliver up to 16A for high-current rails

✅ Board Space Saving: Integrated inductor, MOSFETs, and controller reduce PCB complexity and footprint

✅ Clock Synchronization & Phase Interleaving: Enables interleaved switching for reduced input ripple and improved thermal distribution

✅ Fast Transient Response: Current-mode architecture ensures rapid regulation during load changes

Typical Use Cases:

Multi-rail power supplies on server motherboards or high-performance embedded platforms

Point-of-load modules in telecom systems like routers and base stations

Industrial embedded systems requiring precise voltage management for core logic, analog interfaces, and peripheral devices

2. Powering FPGAs, DSPs, and ASICs

FPGAs, DSPs, and ASICs are central to many modern systems, and their power supply requirements are often complex:

Multiple voltage levels (e.g., Core, I/O, PLL)

High output currents (especially for core rails)

Tight regulation and fast transient response

Sequencing and tracking between rails

The LTM4644IY#PBF is purpose-built to meet these demands:

✅ Supports Tracking and Sequencing: TRACK/SS pins allow precise start-up control, essential for FPGA initialization

✅ High Output Accuracy: ±1.5% regulation ensures stable operation of sensitive devices

✅ Dynamic Load Response: Ideal for processors with rapidly changing current demands

✅ Broad Compatibility: Suitable for major chip platforms like Intel, Xilinx, and Texas Instruments

✅ Optimized Thermal Performance: Compact BGA package with excellent heat dissipation, enabling close placement to high-power chips

Real-World Applications:

Core / I/O / Auxiliary rails of a Xilinx or Intel FPGA powered by separate LTM4644 channels

High-performance DSPs used in image processing or radar systems

ASICs in communications infrastructure requiring strict voltage control

Centralized power delivery for multi-core AI edge computing modules

Technical advantages

1.Simplified design: No need for external MOSFETs and inductors. Only a small amount of input/output capacitors are required to complete the power supply solution deployment.

2.Fast response: The current mode control structure has excellent transient response capability.

3.Flexible expansion: Multiple modules can be connected in parallel or synchronized to achieve high power output or coordinated operation of multiple power supplies.

Conclusion

For power applications that require high reliability, compact layout and flexible output, the LTM4644IY#PBF is an extremely attractive solution. Its high integration not only significantly simplifies the design process, but also effectively improves system efficiency and stability, and is applicable to various fields ranging from industrial equipment to high-end communication systems.