LTM4644MPY#PBF - Quad 4A DC/DC μModule Regulator | Analog Devices
MPN: LTM4644MPY#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $30.94 | $30.94 |
| 10 | $28.5 | $285.00 |
| 100 | $25 | $2,500.00 |
| 500 | $22 | $11,000.00 |
| 1,000 | $20 | $20,000.00 |
LTM4644MPY#PBF Overview
A μModule regulator is a complete power management solution in a single package, combining the controller, MOSFETs, inductors, and compensation circuitry. This integration reduces design complexity, improves reliability, and accelerates time-to-market. The LTM4644 belongs to the family of DC/DC converters, specifically non-isolated point-of-load (PoL) modules, which are essential in modern electronic systems for efficient voltage conversion.
Key features include four 4A outputs that can be paralleled for higher current, a wide input voltage range of 4V to 14V, and an adjustable output range of 0.6V to 5.5V. The module offers high efficiency, typically above 90%, and includes output voltage tracking, remote sense, and overcurrent protection. The MP grade ensures operation over the full -55°C to 125°C internal temperature range, making it suitable for harsh environments.
Technically, the LTM4644 uses a current-mode control architecture with internal compensation, providing stable operation with ceramic output capacitors. The module supports frequency synchronization from 400kHz to 1.8MHz, allowing optimization for efficiency or size. Its BGA package with 77 terminals ensures excellent thermal performance, with a junction-to-case thermal resistance of 6.5°C/W.
Typical applications include high-performance computing, networking equipment, industrial systems, and aerospace/defense electronics. The wide temperature range and high reliability make it ideal for mission-critical applications. For instance, in FPGA and ASIC power supplies, the LTM4644 can provide multiple low-voltage rails with tight regulation.
When designing with this module, ensure adequate input and output capacitance as specified in the datasheet. The MP grade is recommended for applications requiring extended temperature operation, while the E grade is suitable for commercial use. Proper thermal management, including a thermal pad connection to the PCB, is essential for maximizing performance.
Drop-in alternatives for LTM4644MPY#PBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LTM4644MPY#PBF (same form factor and footprint) — differing in Efficiency, Package, Features, Operating Temperature Range, Switching Frequency.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTM4644EY#PBF
✅ Drop-In✓ In Stock
$27 / Unit
View Datasheet →LTM4644IY#PBF
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$20 / Unit
View Datasheet →LTM4644HY#PBF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTM4644MPY#PBF
✅ Drop-In✓ In Stock
$20 / Unit
View Datasheet →LTM4644-1MPY#PBF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTM4644MPY#PBF
✅ Drop-In✓ In Stock
$20 / Unit
View Datasheet →LTM4644MPY#PBF Maximum Ratings & Electrical Characteristics
| Output Type | Adjustable |
| Number of Outputs | 4 |
| Output Voltage Range | 0.6 V to 5.5 V |
| Output Current per Channel | 4 A |
| Maximum Total Output Current | 16 A (parallel) |
| Input Voltage Range | 4 V to 14 V |
| Switching Frequency | 400 kHz to 1.8 MHz |
| Efficiency | >90% typical |
| Operating Temperature Range | -55°C to 125°C (internal) |
| Package | BGA (16mm × 16mm × 5.01mm) |
| Number of Terminals | 77 |
| Mounting Type | Surface Mount |
| Thermal Resistance (Junction-to-Case) | 6.5°C/W |
| Control Architecture | Current-mode |
| Features | Output voltage tracking, remote sense, overcurrent protection |
LTM4644MPY#PBF Pin Configuration
| Pin A1 | VIN1 — Input supply for channel 1 |
| Pin A2 | VIN2 — Input supply for channel 2 |
| Pin A3 | VIN3 — Input supply for channel 3 |
| Pin A4 | VIN4 — Input supply for channel 4 |
| Pin B1 | VOUT1 — Output of channel 1 |
| Pin B2 | VOUT2 — Output of channel 2 |
| Pin B3 | VOUT3 — Output of channel 3 |
| Pin B4 | VOUT4 — Output of channel 4 |
| Pin C1 | GND — Ground |
| Pin C2 | GND — Ground |
| Pin C3 | GND — Ground |
| Pin C4 | GND — Ground |
Typical Applications
LTM4644MPY#PBF is suitable for 6 applications: FPGA and ASIC Power Supplies, Networking Equipment, Industrial Automation, Aerospace and Defense, High-Performance Computing, Medical Electronics.
FPGA and ASIC Power Supplies
The LTM4644MPY#PBF provides multiple low-voltage, high-current rails required by FPGAs and ASICs. Its four 4A outputs can be paralleled to deliver up to 16A for core voltages, while independent outputs power I/O and auxiliary rails. The module's wide input range (4V-14V) and adjustable output (0.6V-5.5V) accommodate various logic levels. Its high efficiency (>90%) reduces thermal stress, and the integrated inductors simplify layout. The MP grade's -55°C to 125°C range ensures reliable operation in harsh environments, making it ideal for aerospace and defense systems.
Recommended
Networking Equipment
In networking equipment, the LTM4644MPY#PBF powers high-performance processors, SerDes, and memory. Its four outputs can supply separate rails for core, I/O, and auxiliary voltages, reducing the number of discrete regulators. The module's current-mode control and internal compensation ensure stable operation with ceramic capacitors, minimizing output ripple. The wide input range supports 12V intermediate bus architectures. The MP grade's extended temperature range is beneficial for outdoor and industrial networking gear. The compact BGA package saves board space, enabling dense designs.
Recommended
Industrial Automation
The LTM4644MPY#PBF is well-suited for industrial automation systems that require reliable, efficient power delivery. Its wide input voltage range (4V-14V) accommodates various industrial supply rails, while the adjustable outputs (0.6V-5.5V) power microcontrollers, sensors, and communication interfaces. The module's high efficiency reduces heat generation, and its integrated design enhances reliability in vibration-prone environments. The MP grade's -55°C to 125°C operating range ensures performance in extreme temperatures. The module's remote sense feature maintains accurate output voltage despite load transients.
Recommended
Aerospace and Defense
The LTM4644MPY#PBF is designed for aerospace and defense applications requiring high reliability and wide temperature operation. Its MP grade guarantees -55°C to 125°C internal temperature range, meeting stringent military specifications. The module's integrated design reduces component count and improves resistance to shock and vibration. The four outputs can be configured to power FPGAs, processors, and sensors in avionics and satellite systems. The module's high efficiency minimizes power loss, critical for space-based systems. Analog Devices provides screening and qualification data for space applications.
Recommended
High-Performance Computing
In high-performance computing, the LTM4644MPY#PBF delivers multiple low-voltage, high-current rails for CPUs, GPUs, and memory. Its four 4A outputs can be paralleled to provide up to 16A for core voltages, while independent outputs power I/O and auxiliary rails. The module's high efficiency (>90%) reduces cooling requirements, and its compact BGA package saves board space. The wide input range (4V-14V) supports various power architectures. The MP grade's extended temperature range ensures reliable operation in data centers and edge computing environments.
Recommended
Medical Electronics
The LTM4644MPY#PBF is suitable for medical electronics that demand high reliability and precise voltage regulation. Its four outputs can power multiple rails in imaging systems, patient monitors, and diagnostic equipment. The module's low output ripple and high PSRR ensure clean power for sensitive analog circuits. The wide input range (4V-14V) accommodates various battery and adapter voltages. The MP grade's -55°C to 125°C range ensures operation in sterilization and transport conditions. The integrated design simplifies compliance with medical safety standards.
Recommended
Recommended Products Summary
Engineering reference data for LTM4644MPY#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTM4644EY#PBF | LTM4644IY#PBF | LTM4644HY#PBF |
|---|---|---|---|---|
| Package | BGA (16mm × 16mm × 5.01mm) | BGA (16mm × 16mm × 5.01mm) | BGA (16mm × 16mm × 5.01mm) | BGA (16mm × 16mm × 5.01mm) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Output Current per Channel | 4A | 4A | 4A | 4A |
| Input Voltage Range | 4V to 14V | 4V to 14V | 4V to 14V | 4V to 14V |
| Output Voltage Range | 0.6V to 5.5V | 0.6V to 5.5V | 0.6V to 5.5V | 0.6V to 5.5V |
| Operating Temperature Range | -55°C to 125°C | -40°C to 125°C | -40°C to 125°C | -40°C to 125°C |
| Switching Frequency | 400kHz to 1.8MHz | 400kHz to 1.8MHz | 400kHz to 1.8MHz | 400kHz to 1.8MHz |
| Efficiency | >90% typical | >90% typical | >90% typical | >90% typical |
Key Differentiators
- Extended temperature range (-55°C to 125°C) (vs LTM4644EY#PBF)
- Integrated inductors and MOSFETs (vs Discrete DC/DC solutions)
- Configurable output array up to 16A (vs LTM4644-1MPY#PBF)
Design Notes
The LTM4644MPY#PBF has a junction-to-case thermal resistance of 6.5°C/W. For high-current applications, ensure adequate PCB thermal management. Use multiple vias under the BGA package to conduct heat to inner and bottom layers. A thermal pad connection to a large copper plane is essential. For example, at 16A output with 5V drop, power dissipation is 80W, requiring a heatsink or forced airflow. Refer to the datasheet's thermal derating curves.
Place input and output capacitors close to the module's pins to minimize parasitic inductance. Use low-ESR ceramic capacitors, e.g., 22µF for input and 100µF for output per channel. The datasheet recommends specific capacitor values for stable operation. Ensure the PCB layout provides a low-impedance ground plane. For paralleling outputs, connect the outputs together with short, wide traces to balance current sharing.
Do not exceed the absolute maximum input voltage of 16V. Ensure the output voltage is set correctly using external resistors. The MP grade is required for -55°C operation; using E grade in such environments may cause failure. When paralleling outputs, all channels must have the same output voltage setting. Also, avoid operating at high input-output differentials without proper thermal management, as efficiency drops and power dissipation increases.
Compliance Information
RoHS compliant per Analog Devices. Not AEC-Q100 qualified. Lead-free (PBF suffix).
