LTM4644EY#PBF - Quad 4A DC/DC μModule Regulator | Analog Devices
MPN: LTM4644EY#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $38.72 | $38.72 |
| 10 | $35.5 | $355.00 |
| 100 | $32 | $3,200.00 |
| 500 | $29.5 | $14,750.00 |
| 1,000 | $27 | $27,000.00 |
LTM4644EY#PBF Overview
A DC/DC converter is an electronic circuit that converts a source of direct current (DC) from one voltage level to another. The LTM4644EY#PBF is a step-down (buck) converter, which reduces a higher input voltage to a lower output voltage with high efficiency. As a μModule, it encapsulates the entire power train in a single package, offering a complete power management solution that minimizes external components and PCB area. This product belongs to the broader category of power management ICs, specifically switching voltage regulators, and is widely used in distributed power architectures.
Key features include four independent 4A outputs, each with its own SVIN pin for operation from input voltages as low as 2.375V, and a separate VIN pin for the power stage. The module supports output voltage tracking, remote sense, and parallel operation for higher current. It offers protection features such as overcurrent protection (OCP), overtemperature protection (OTP), and overvoltage protection (OVP). The operating temperature range is -40°C to 125°C, and the module is RoHS compliant.
Technically, the LTM4644EY#PBF uses a current-mode control architecture with internal compensation, ensuring stable operation across a wide range of output capacitors. The integrated inductors and power FETs are optimized for efficiency up to 95%, reducing power loss and thermal stress. The module's BGA package provides excellent thermal performance, with the exposed pad facilitating heat transfer to the PCB.
Typical applications include powering FPGAs, ASICs, DSPs, and memory in networking, telecommunications, industrial, and embedded systems. The quad-output configuration is particularly suited for multi-rail systems where multiple voltages are required, such as core, I/O, and auxiliary supplies. The ability to parallel outputs enables scaling to higher currents without redesign.
When designing with this module, ensure adequate input and output capacitance as recommended in the datasheet, and provide a low-impedance ground plane for thermal and electrical performance. The SVIN pins allow independent control of each channel, enabling flexible power sequencing.
Drop-in alternatives for LTM4644EY#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 LTM4644EY#PBF (same form factor and footprint) — differing in Package, Efficiency, Input Voltage Range, Output Type, Output Voltage Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTM4644IY#PBF
✅ Drop-In✓ In Stock
$20 / Unit
View Datasheet →LTM4644EY-1#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTM4644MPY#PBF
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$20 / Unit
View Datasheet →LTM4644IY-1#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
TPS65240DRCR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTM4644EY#PBF Maximum Ratings & Electrical Characteristics
| Output Type | Adjustable |
| Output Voltage Range | 0.6 V to 5.5 V |
| Maximum Output Current | 4 A per output (up to 16 A paralleled) |
| Input Voltage Range | 4 V to 14 V |
| Number of Outputs | 4 |
| Efficiency | Up to 95% |
| Operating Temperature | -40°C to 125°C |
| Package | BGA (μModule) |
| Mounting Type | Surface Mount |
| Features | OCP, OTP, OVP |
| Applications | ITE (Commercial) |
| RoHS Status | Compliant |
| MSL Level | 3 (168 Hours) |
| REACH | Unaffected |
LTM4644EY#PBF Pin Configuration
| Pin A1 | VIN — Power input for the top MOSFET |
| Pin A2 | SVIN1 — Signal input for channel 1 control circuitry |
| Pin A3 | SVIN2 — Signal input for channel 2 control circuitry |
| Pin A4 | SVIN3 — Signal input for channel 3 control circuitry |
| Pin A5 | SVIN4 — Signal input for channel 4 control circuitry |
| Pin B1 | VOUT1 — Output voltage for channel 1 |
| Pin B2 | VOUT2 — Output voltage for channel 2 |
| Pin B3 | VOUT3 — Output voltage for channel 3 |
| Pin B4 | VOUT4 — Output voltage for channel 4 |
| Pin B5 | GND — Ground |
| Pin C1 | RUN1 — Enable for channel 1 |
| Pin C2 | RUN2 — Enable for channel 2 |
| Pin C3 | RUN3 — Enable for channel 3 |
| Pin C4 | RUN4 — Enable for channel 4 |
| Pin C5 | PGOOD — Power good indicator |
Typical Applications
LTM4644EY#PBF is suitable for 6 applications: FPGA Power Supplies, Networking Equipment, Industrial Automation, Embedded Computing, Telecommunications, Data Center Servers.
FPGA Power Supplies
The LTM4644EY#PBF provides four independent 4A outputs, ideal for powering FPGA core, I/O, and auxiliary rails. Its wide input range (4V-14V) and high efficiency (up to 95%) reduce thermal stress, while the integrated inductors simplify layout. The module's parallel capability allows scaling to 16A for high-end FPGAs, and its OCP/OTP protections ensure reliable operation in demanding environments.
Recommended
Networking Equipment
In networking switches and routers, the LTM4644EY#PBF powers multiple voltage rails for processors, memory, and SerDes. Its quad outputs can supply 0.9V, 1.2V, 1.8V, and 3.3V simultaneously, meeting the requirements of modern networking ICs. The module's high efficiency reduces heat in densely packed chassis, and its compact BGA package saves PCB space. The separate SVIN pins allow operation from lower input voltages, enhancing flexibility in power distribution.
Recommended
Industrial Automation
The LTM4644EY#PBF is suitable for industrial automation systems that require multiple regulated voltages from a 12V or 24V bus. Its input range of 4V to 14V covers common industrial supplies, and the module's -40°C to 125°C operating range ensures reliability in harsh environments. The integrated protection features (OCP, OTP, OVP) safeguard against faults, while the high efficiency minimizes heat dissipation in sealed enclosures. The module's small footprint allows for compact control boards.
Recommended
Embedded Computing
For embedded systems, the LTM4644EY#PBF provides a complete power solution for processors, memory, and peripherals. Its quad outputs can be configured to match the voltage requirements of SoCs and FPGAs, while the module's high efficiency extends battery life in portable applications. The integrated inductors reduce EMI and simplify compliance testing. The module's small size is ideal for space-constrained designs, and its parallel capability allows for future scalability.
Recommended
Telecommunications
In telecom infrastructure, the LTM4644EY#PBF powers base stations, switches, and routers. Its wide input range (4V-14V) accommodates various intermediate bus voltages, and the quad outputs can supply multiple rails for ASICs and FPGAs. The module's high efficiency reduces cooling requirements, and its robust protection features ensure continuous operation. The compact BGA package enables high-density board designs, and the module's reliability is backed by Analog Devices' quality standards.
Recommended
Data Center Servers
The LTM4644EY#PBF is used in data center servers to power CPUs, memory, and storage controllers. Its quad outputs can provide core, I/O, and auxiliary voltages with high efficiency, reducing energy consumption and heat. The module's parallel capability allows scaling to 16A for high-performance processors. The integrated inductors and power FETs minimize external components, simplifying design and improving reliability. The module's wide input range supports various power architectures.
Recommended
Recommended Products Summary
Engineering reference data for LTM4644EY#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTM4644IY#PBF | LTM4644EY-1#PBF | LTM4644MPY#PBF | LTM4644IY-1#PBF | TPS65240DRCR |
|---|---|---|---|---|---|---|
| Package | BGA (μModule) | BGA (μModule) | BGA (μModule) | BGA (μModule) | BGA (μModule) | BGA (μModule) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
Key Differentiators
- Quad-output design with 4A per channel (vs TPS65240DRCR)
- Integrated inductors and power FETs (vs Discrete solutions)
- High efficiency up to 95% (vs LTM4644IY#PBF)
Design Notes
Place the LTM4644EY#PBF on a PCB with a solid ground plane to ensure good thermal performance. The BGA package has an exposed pad that should be soldered to a thermal via array to dissipate heat. Follow the layout guidelines in the datasheet, including proper input and output capacitor placement close to the module pins.
The LTM4644EY#PBF can dissipate significant power at high output currents. Ensure adequate copper area and airflow to keep the junction temperature within the -40°C to 125°C range. Use thermal vias under the module to transfer heat to the opposite side of the PCB. For high ambient temperatures, consider derating the output current.
Do not exceed the absolute maximum input voltage of 14V on the VIN pin. The SVIN pins can operate from 2.375V, but the power stage requires the full input voltage. Ensure proper decoupling with low-ESR ceramic capacitors. Also, verify the output voltage setting resistors are correctly calculated for the desired output voltage.
Compliance Information
RoHS3 compliant and REACH unaffected per PartGenie data. Not AEC-Q100 qualified as it is not an automotive part.
