LTM4644IY#PBF - Quad 4A DC/DC μModule Regulator | Analog Devices
MPN: LTM4644IY#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 |
LTM4644IY#PBF Overview
A μModule regulator is a complete power management solution in a single package, combining the controller, power stage, inductors, and compensation into a compact module. This integration reduces design complexity, improves reliability, and accelerates time-to-market compared to discrete solutions. The LTM4644IY#PBF belongs to the DC-DC converter family, specifically a step-down (buck) regulator, which is essential in power management ICs for converting higher input voltages to lower, regulated output voltages.
Key features include four independent 4A outputs, each adjustable from 0.6V to 5.5V, with the ability to parallel outputs for higher current. The module offers high efficiency, typically above 90%, and includes output voltage tracking, remote sense, and a precision reference. It operates over the -40°C to 125°C internal temperature range, with the I-grade version (IY) guaranteed for -40°C to 125°C, while the E-grade (EY) is specified for 0°C to 125°C.
Technically, the LTM4644IY#PBF uses a current-mode control architecture with internal compensation, providing fast transient response and stable operation with ceramic output capacitors. The module supports frequency synchronization from 400kHz to 2.4MHz, allowing optimization for efficiency or size. Its BGA package offers excellent thermal performance, with a thermal resistance of 12°C/W, enabling high power density without external heatsinks in many applications.
Typical applications include powering FPGAs, ASICs, processors, and memory in networking, telecommunications, industrial, and data center equipment. The quad outputs are ideal for multi-rail systems requiring sequenced power-up, and the high current capability supports core and I/O voltages. The module's wide input range and adjustable outputs make it versatile for various point-of-load (PoL) designs.
When designing with the LTM4644IY#PBF, ensure adequate input and output capacitance as recommended in the datasheet, and consider thermal management for high-current operation. The module's integrated inductors and compensation simplify layout, but proper PCB design with sufficient copper area for heat spreading is critical for optimal performance.
Drop-in alternatives for LTM4644IY#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 LTM4644IY#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:
LTM4644IY
✅ Drop-In📋 Reference alternative (not in catalog)
LTM4644EY#PBF
✅ Drop-In✓ In Stock
$27 / Unit
View Datasheet →LTM4644IY-1#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTM4644A
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTM4644MPY#PBF
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$20 / Unit
View Datasheet →LTM4644IY#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 2.4 MHz (synchronizable) |
| Efficiency | Up to 95% (typical) |
| Operating Temperature Range | -40°C to 125°C (internal) |
| Package | 77-pin BGA (15mm x 15mm x 5.01mm) |
| Mounting Type | Surface Mount |
| Thermal Resistance (θJA) | 12°C/W |
| RoHS Status | Compliant |
| REACH Status | Compliant |
| MSL Level | 3 (168 hours) |
LTM4644IY#PBF Pin Configuration
| Pin A1 | VIN1 — Input supply for channel 1 |
| Pin A2 | VOUT1 — Output of channel 1 |
| Pin A3 | GND — Ground |
| Pin B1 | VIN2 — Input supply for channel 2 |
| Pin B2 | VOUT2 — Output of channel 2 |
| Pin B3 | GND — Ground |
| Pin C1 | VIN3 — Input supply for channel 3 |
| Pin C2 | VOUT3 — Output of channel 3 |
| Pin C3 | GND — Ground |
| Pin D1 | VIN4 — Input supply for channel 4 |
| Pin D2 | VOUT4 — Output of channel 4 |
| Pin D3 | GND — Ground |
Typical Applications
LTM4644IY#PBF is suitable for 6 applications: FPGA Power Supply, Networking Equipment, Data Center Servers, Industrial Automation, Telecommunications, Test and Measurement.
FPGA Power Supply
The LTM4644IY#PBF provides four independent 4A outputs, ideal for powering FPGA core, I/O, and auxiliary rails. Its wide input range (4V-14V) and adjustable outputs (0.6V-5.5V) match FPGA requirements, while high efficiency reduces thermal stress. The integrated inductors simplify layout, and the module's small BGA package saves board space. With output sequencing and tracking, it ensures proper power-up for FPGAs, enhancing system reliability.
Recommended
Networking Equipment
In networking switches and routers, the LTM4644IY#PBF powers multiple rails for ASICs, PHYs, and memory. Its quad outputs can supply 1.0V core, 1.8V I/O, 2.5V auxiliary, and 3.3V logic, all from a 12V bus. The module's high efficiency and low profile (5.01mm) fit dense line cards. Frequency synchronization reduces EMI, and the -40°C to 125°C range suits telecom environments. The integrated solution accelerates design and improves MTBF.
Recommended
Data Center Servers
The LTM4644IY#PBF is ideal for server power distribution, powering CPU, memory, and storage controllers. Its 4A per output can be paralleled for up to 16A for high-current cores. The module's high efficiency reduces cooling requirements, and its integrated design minimizes board space, enabling high-density server blades. With remote sense and precise regulation, it maintains voltage accuracy under dynamic loads, ensuring reliable operation in 24/7 environments.
Recommended
Industrial Automation
In industrial control systems, the LTM4644IY#PBF provides robust power for PLCs, motor drives, and sensors. Its wide input range (4V-14V) accommodates 12V or 24V industrial buses, and the -40°C to 125°C temperature range ensures operation in harsh environments. The module's high efficiency and thermal performance reduce heat sink requirements, while its integrated inductors and capacitors improve reliability against vibration. Output sequencing supports safe power-up of multi-rail systems.
Recommended
Telecommunications
The LTM4644IY#PBF is well-suited for telecom base stations and switches, powering DSPs, FPGAs, and line cards. Its quad outputs can generate multiple voltages from a 12V or 48V (via intermediate bus) supply. The module's high efficiency reduces power loss, and its small footprint allows for compact designs. Frequency synchronization minimizes interference with communication signals. The industrial temperature grade ensures reliable operation in outdoor or uncontrolled environments.
Recommended
Test and Measurement
In test equipment, the LTM4644IY#PBF provides clean, regulated power for precision analog and digital circuits. Its low output noise and high PSRR ensure accurate measurements. The quad outputs can power multiple test channels, and the module's adjustable outputs allow flexible voltage settings. The integrated design reduces EMI, which is critical in sensitive measurement environments. The wide temperature range supports benchtop and field instruments.
Recommended
Recommended Products Summary
Engineering reference data for LTM4644IY#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTM4644IY | LTM4644EY#PBF | LTM4644IY-1#PBF | LTM4644A | LTM4644MPY#PBF |
|---|---|---|---|---|---|---|
| Package | 77-pin BGA | 77-pin BGA | 77-pin BGA | 77-pin BGA | 77-pin BGA | 77-pin BGA |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Output Current per Channel | 4A | 4A | 4A | 4A | 4A | 4A |
| Input Voltage Range | 4V to 14V | 4V to 14V | 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 | 0.6V to 5.5V | 0.6V to 5.5V |
| Operating Temperature Range | -40°C to 125°C | -40°C to 125°C | 0°C to 125°C | -40°C to 125°C | -40°C to 125°C | -55°C to 125°C |
| RoHS Compliant | Yes | No (tin-lead) | Yes | Yes | Yes | Yes |
| Efficiency (Typical) | Up to 95% | Up to 95% | Up to 95% | Up to 95% | Up to 96% | Up to 95% |
Key Differentiators
- Industrial temperature grade (vs LTM4644EY#PBF)
- Lead-free (RoHS) finish (vs LTM4644IY)
- Higher efficiency than standard version (vs LTM4644IY)
Design Notes
The LTM4644IY#PBF has a θJA of 12°C/W. For high-current operation, ensure adequate PCB copper area and thermal vias to dissipate heat. For example, at 12V input, 1.0V output, and 16A total, power dissipation is approximately 12W, causing a 144°C temperature rise. Use a 4-layer PCB with thermal relief and consider airflow for ambient temperatures above 50°C.
Place input and output capacitors close to the module pins to minimize parasitic inductance. Use low-ESR ceramic capacitors (e.g., 22µF for input, 100µF for output) as recommended in the datasheet. Ensure the BGA pads have proper solder mask and stencil design for reliable soldering. Follow the layout guidelines in the datasheet for optimal performance.
Do not exceed the absolute maximum input voltage of 16V. Ensure the output voltage is set correctly using external resistors, and avoid floating the RUN/SS pins. For paralleling outputs, follow the current sharing guidelines to prevent imbalance. Also, verify the thermal derating curve to avoid exceeding the maximum junction temperature of 125°C.
Compliance Information
RoHS compliant per #PBF suffix. REACH compliant per Analog Devices. Not AEC-Q100 qualified.
