LTM4644IY#PBF - Quad 4A DC/DC μModule Regulator | Analog Devices
MPN: LTM4644IY#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $42.43 | $42.43 |
| 10 | $38.19 | $381.90 |
| 100 | $34.36 | $3,436.00 |
| 500 | $30.94 | $15,470.00 |
| 1,000 | $30.94 | $30,940.00 |
Drop-in alternatives for LTM4644IY#PBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTM4644IY-1#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTM4644EY#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTM4644A
✅ Drop-In📋 Reference alternative (not in catalog)
LTM4644IY
✅ Drop-In📋 Reference alternative (not in catalog)
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 | [DATA_NEEDED: switching frequency] |
| Efficiency | [DATA_NEEDED: efficiency] |
| Package | 77-pin BGA |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40°C to 125°C (internal) |
| RoHS Status | Compliant |
| Features | Output voltage tracking, overcurrent protection, overtemperature protection |
| Isolation | Non-Isolated |
| Topology | Step-Down (Buck) |
LTM4644IY#PBF Pin Configuration
| Pin A1 | VIN — Input supply voltage |
| Pin A2 | VOUT1 — Output 1 |
| Pin A3 | VOUT2 — Output 2 |
| Pin A4 | VOUT3 — Output 3 |
| Pin A5 | VOUT4 — Output 4 |
| Pin B1 | GND — Ground |
| Pin B2 | FB1 — Feedback 1 |
| Pin B3 | FB2 — Feedback 2 |
| Pin B4 | FB3 — Feedback 3 |
| Pin B5 | FB4 — Feedback 4 |
| Pin C1 | RUN1 — Enable 1 |
| Pin C2 | RUN2 — Enable 2 |
| Pin C3 | RUN3 — Enable 3 |
| Pin C4 | RUN4 — Enable 4 |
| Pin C5 | PGOOD — Power good indicator |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
LTM4644IY#PBF is suitable for 6 applications: FPGA Power Supplies, ASIC and Processor Power, Telecom and Networking Equipment, Industrial Systems, Medical Devices, Automotive Electronics.
FPGA Power Supplies
The LTM4644IY#PBF provides four 4A outputs with adjustable 0.6V to 5.5V, ideal for FPGA core, I/O, and auxiliary rails. Its integrated inductors and controllers reduce EMI and simplify layout, while paralleling outputs enables up to 16A for high-end FPGAs. The wide input range supports 12V intermediate bus architectures, and the compact BGA package fits dense PCB designs.
Recommended
ASIC and Processor Power
This module delivers high-current, low-voltage rails for ASICs and processors, with 4A per channel and up to 16A paralleled. The 0.6V to 5.5V output range covers core voltages, and the integrated design minimizes board space. Its high efficiency reduces thermal stress, and the -40°C to 125°C range suits industrial and automotive environments.
Recommended
Telecom and Networking Equipment
The LTM4644IY#PBF is suited for telecom and networking gear, providing multiple regulated outputs from a 12V bus. Its high efficiency and integrated inductors reduce heat and EMI, critical for dense line cards. The ability to parallel outputs supports high-current loads like switch ASICs, while the compact BGA package fits space-constrained designs.
Recommended
Industrial Systems
With a 4V to 14V input range and -40°C to 125°C operation, the LTM4644IY#PBF is ideal for industrial control, robotics, and automation. It provides reliable, low-noise power for sensors, MCUs, and FPGAs in harsh environments. The integrated design reduces component count and improves MTBF, while output tracking ensures proper sequencing in multi-rail systems.
Recommended
Medical Devices
The LTM4644IY#PBF is suitable for medical equipment requiring high reliability and compact power solutions. Its wide temperature range and integrated design ensure consistent performance in diagnostic and monitoring devices. The low EMI and high efficiency are beneficial for sensitive analog front-ends, and the module's small footprint aids in miniaturization.
Recommended
Automotive Electronics
The LTM4644IY#PBF operates over the automotive temperature range and can be used in infotainment, ADAS, and body control modules. Its 4V to 14V input covers car battery voltages, and the high efficiency reduces heat in enclosed spaces. The integrated inductors and controllers provide robust performance against vibration and thermal cycling.
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-1#PBF | LTM4644EY#PBF | LTM4644A | LTM4644IY | TPS65400 |
|---|---|---|---|---|---|---|
| Package | 77-pin BGA | 77-pin BGA | 77-pin BGA | 77-pin BGA | 77-pin BGA | VQFN-40 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Number of Outputs | 4 | 4 | 4 | 4 | 4 | 4 |
| Output Current per Channel | 4A | 4A | 4A | 4A | 4A | 3A |
| Input Voltage Range | 4V to 14V | 4V to 14V | 4V to 14V | 4V to 14V | 4V to 14V | 4.5V to 18V |
| 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 85°C | -40°C to 125°C | -40°C to 125°C | -40°C to 125°C |
| RoHS Compliant | Yes | Yes | Yes | Yes | No | Yes |
Key Differentiators
- Integrated inductors and controllers in a compact BGA (vs TPS65400)
- Industrial temperature grade (-40°C to 125°C) (vs LTM4644EY#PBF)
- Pin-to-pin compatibility with LTM4644A (vs LTM4644A)
Design Notes
The LTM4644IY#PBF in a 77-pin BGA package requires proper thermal management. Use a thermal relief pattern with multiple vias under the exposed pad to conduct heat to inner PCB layers. Ensure adequate copper area for heat spreading, especially when operating at high output currents. The datasheet provides thermal derating curves; verify junction temperature stays within limits.
Place input and output capacitors close to the module pins to minimize parasitic inductance. Use low-ESR ceramic capacitors, typically 10µF to 100µF per output, as recommended in the datasheet. For paralleled outputs, ensure symmetric layout to balance current sharing. Follow the layout guidelines in the datasheet for optimal performance.
Do not exceed the absolute maximum input voltage of 14V. Ensure the output voltage is set correctly using the feedback resistors, and avoid floating the RUN pins. For paralleled outputs, connect all feedback pins together and use a single resistor divider. Also, ensure proper sequencing if using multiple modules.
Compliance Information
RoHS compliant per PBF suffix and distributor data. AEC-Q100 not applicable for this power module.
