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Analog Devices Inc. LTM4644IY#PBF
- Part No.:
- LTM4644IY#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Converters
- Package:
- 77-BBGA Module
- Datasheet:
-
LTM4644IY#PBF.pdf
- Description:
- DC DC CONVERTER 4X0.6-5.5V
- Quantity:
- Payment:
- Shipping:
Inventory:2,069
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Product details
Overview
LTM4644IY#PBF from Analog Devices is a quad-output step-down µModule® regulator delivering 4A DC (5A peak) per channel, operating from 4V–14V input (or 2.375V–14V with external bias), supporting 0.6V–5.5V programmable output voltage per rail, and featuring current-mode control with ±1.5% total output regulation-designed for multirail point-of-load regulation in FPGA, ASIC, and DSP power systems.
For engineers reviewing the LTM4644IY#PBF datasheet, LTM4644IY#PBF pinout, LTM4644IY#PBF application, or LTM4644IY#PBF equivalent, key selection considerations include per-channel 4A continuous output capability, 9mm × 15mm BGA package with integrated inductors and MOSFETs, output voltage tracking/soft-start via TRACK/SS pins, external frequency synchronization (700kHz–1.3MHz), and parallel operation support up to 16A across four channels.
Technical Context
The LTM4644IY#PBF integrates four independent constant-frequency valley-current-mode buck regulators, each with internal 3.3V INTVCC generation, on-die temperature sensing diode (TEMP pin), and open-drain PGOOD monitoring with ±10% window detection. It uses internal compensation and supports both forced CCM (MODE = INTVCC) and DCM (MODE = SGND) operation.
Each channel features dedicated RUN, TRACK/SS, FB, COMP, SVIN, and MODE pins enabling individual enable/disable, soft-start ramping, output voltage programming (via external resistor network), current sharing in parallel configurations, and bias supply decoupling-enabling precise sequencing, dynamic load response under 40µs settling time, and thermal-aware system-level power management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 14V (or 2.375V to 14V with external bias)-supports wide industrial and telecom input rails without auxiliary supplies. |
| Output Voltage Range | 0.6V to 5.5V per channel-covers core, I/O, and auxiliary rails for FPGAs, ASICs, and processors. |
| Output Current | 4A continuous, 5A peak per channel-enables high-density POL delivery with minimal external components. |
| Regulation Accuracy | ±1.5% total over line/load/temperature-ensures stable voltage margins for advanced logic families. |
| Switching Frequency | 1MHz default, synchronizable from 700kHz to 1.3MHz-reduces EMI sensitivity and enables multi-phase interleaving. |
| Package Dimensions | 9mm × 15mm × 5.01mm BGA-integrates inductors, MOSFETs, controllers, and passives into a compact surface-mount module. |
| Thermal Performance | 5.5W max power dissipation at TA = 60°C, 200 LFM, no heatsink-validates thermal design for convection-cooled embedded systems. |
Pinout & Package
The LTM4644IY#PBF uses a 77-lead BGA package (9mm × 15mm × 5.01mm) with exposed thermal pad. Pin assignments follow standard µModule layout: VOUT, VIN, GND, and signal pins distributed across rows A–L and columns 1–7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT1–VOUT4 | Power output terminals | Four independent regulated outputs; each supports 4A DC load with low-impedance connection to local ceramic decoupling. |
| VIN1–VIN4 | High-side MOSFET drain inputs | Direct connection to input source; requires local 10µF ceramic decoupling per channel to suppress switching ripple. |
| PGOOD1–PGOOD4 | Open-drain power-good indicators | Assert low when FB voltage deviates >±10% from 0.6V reference-used for sequencing and fault reporting. |
| FB1–FB4 | Error amplifier inverting inputs | Internal 60.4kΩ top resistor (LTM4644 variant); external bottom resistor sets output voltage from 0.6V to 5.5V. |
| RUN1–RUN4 | Channel enable controls | Logic-high (>1.2V) enables regulation; <1.1V disables channel-supports independent power-rail sequencing. |
| TRACK/SS1–TRACK/SS4 | Soft-start and voltage tracking inputs | Internal 2.5µA pull-up enables RC soft-start; sub-0.6V voltage forces output tracking of external reference. |
| CLKIN / CLKOUT | Frequency sync interface | CLKIN accepts 700kHz–1.3MHz external clock; CLKOUT provides 180° phase-shifted output for polyphase cascading. |
| TEMP | On-die temperature diode anode | Provides VBE voltage proportional to die temperature-enables real-time thermal monitoring with external circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated µModule architecture | Combines controller, power MOSFETs, inductors, and support components in single BGA-eliminates layout-sensitive magnetics and reduces PCB area by >50% vs discrete solutions. |
| Per-channel output voltage tracking | Enables precise power-rail sequencing (e.g., core before I/O) using external voltage references applied to TRACK/SS pins-critical for FPGA and processor compliance. |
| Parallel-ready current-mode control | Supports accurate current sharing across 2+2, 3+1, or full 4-channel configurations via tied COMP/FB/VOUT-delivers up to 16A with reduced input/output ripple. |
| External frequency synchronization | Accepts 700kHz–1.3MHz clock on CLKIN to align switching edges across multiple modules-minimizes beat frequencies and simplifies EMI filtering. |
| Comprehensive protection suite | Includes overvoltage, overcurrent (foldback), overtemperature, and undervoltage lockout-ensures robust operation during transient faults without external supervision. |
Applications
| FPGA Core & I/O Power | ASIC Multirail Sequencing |
|---|---|
Use Scenario: Powering Xilinx Kintex or Intel Stratix FPGA banks requiring separate 0.85V core, 1.2V AUX, 1.8V I/O, and 3.3V transceiver rails with tight sequencing timing. IC Role / Device Role / Timing Role: LTM4644IY#PBF acts as a quad-channel POL regulator with independent RUN and TRACK/SS control-enabling staggered startup and voltage ramp alignment per bank. Use Value: Eliminates need for four discrete buck modules or complex PMICs while maintaining ±1.5% regulation and <40µs transient recovery across all rails. | Use Scenario: Supplying heterogeneous ASIC subsystems (CPU, GPU, memory controller, SerDes) with distinct voltage requirements and strict power-on reset timing. IC Role / Device Role / Timing Role: LTM4644IY#PBF serves as a configurable multirail source where individual RUN pins and TRACK/SS networks enforce hardware-defined power-up order and voltage ramp rates. Use Value: Achieves deterministic sequencing without software intervention or external supervisors-reducing BOM count and improving system reliability. |
| DSP-Based Signal Processing | Industrial Edge AI Accelerators |
Use Scenario: Delivering clean, low-noise 1.0V, 1.2V, 1.8V, and 3.3V rails to TI C66x or ADI SHARC+ DSPs in radar or medical imaging equipment. IC Role / Device Role / Timing Role: LTM4644IY#PBF operates in forced CCM mode (MODE = INTVCC) to minimize output ripple and ensure stable analog front-end performance. Use Value: Delivers <5mVpp output ripple at full load with ceramic-only output caps-meeting stringent noise budgets for high-resolution ADCs and DACs. | Use Scenario: Powering NVIDIA Jetson Orin or AMD Xilinx Versal AI Core devices in ruggedized edge servers requiring thermal-aware operation and long-term supply stability. IC Role / Device Role / Timing Role: LTM4644IY#PBF leverages its onboard TEMP diode and PGOOD signals to feed real-time thermal and status data to host MCU or PMBus manager (e.g., LTC2975). Use Value: Enables closed-loop thermal throttling and predictive maintenance-extending operational lifetime in unventilated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-output DC/DC regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTM4644EY#PBF | Same electrical specs and pinout; rated for 0°C to 125°C internal operating temperature (vs –40°C to 125°C for LTM4644IY#PBF) | Suitable for commercial-grade applications with controlled ambient; not qualified for extended industrial temperature range. | Select LTM4644EY#PBF only if ambient operating temperature stays above 0°C and full –40°C startup is unnecessary. |
| LTM4644-1IY#PBF | Omits internal 60.4kΩ top feedback resistor-requires two external resistors (RTOP, RBOT) per channel for voltage setting instead of one. | Offers greater flexibility for non-standard output voltages and precision trimming; increases component count and layout complexity. | Choose LTM4644-1IY#PBF when fine-grained output adjustment or tighter tolerance (<0.5%) is required beyond standard resistor table values. |
Compared with LTM4644EY#PBF, the LTM4644IY#PBF guarantees full –40°C to 125°C operation without derating, making it suitable for harsh environments; versus LTM4644-1IY#PBF, the LTM4644IY#PBF simplifies design with single-resistor programming while retaining identical thermal and electrical performance.
Availability
LTM4644IY#PBF is available at Aetrix Electronics and suitable for FPGA power delivery, ASIC multirail sequencing, and industrial edge AI accelerator applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature grade performance.
Supply support for LTM4644IY#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and RF solutions.
The LTM4644IY#PBF belongs to Analog Devices' µModule regulator product line-engineered to integrate complete DC/DC power systems into compact, thermally optimized packages for space-constrained, high-reliability embedded applications.
FAQ
What is the operating temperature range of the LTM4644IY#PBF?
The LTM4644IY#PBF is specified for an internal operating temperature range of –40°C to 125°C and is guaranteed to meet all electrical specifications across this full range. This makes it suitable for industrial and extended-temperature applications where ambient conditions may vary widely, unlike the E-grade variant which is only tested from 0°C to 125°C. The device's thermal protection and internal temperature diode (TEMP pin) further support reliable operation under thermal stress.
How do I program different output voltages on each channel of the LTM4644IY#PBF?
Each channel of the LTM4644IY#PBF uses an internal 60.4kΩ precision resistor between VOUT and FB. To set a specific output voltage, connect an external resistor RFB(BOT) from FB to GND. For example, a 40.2kΩ resistor yields 1.5V output. The formula is RFB(BOT) = 60.4k × (VOUT/0.6 − 1). The LTM4644IY#PBF datasheet provides a full resistor table for common voltages from 0.6V to 5.5V, and the LTM4644IY#PBF supports independent programming per channel.
Can multiple LTM4644IY#PBF units be synchronized for lower EMI?
Yes, the LTM4644IY#PBF supports external frequency synchronization via the CLKIN pin, accepting clocks from 700kHz to 1.3MHz. When multiple LTM4644IY#PBF modules are connected to the same CLKIN source, their switching edges align-reducing beat frequencies and peak EMI. The CLKOUT pin provides a 180° phase-shifted signal to cascade additional modules in polyphase configurations, further smoothing input current ripple.
Does the LTM4644IY#PBF support power-rail sequencing across its four outputs?
Yes, the LTM4644IY#PBF supports precise hardware-based sequencing using individual RUN pins and TRACK/SS inputs. Each RUN pin independently enables its channel, while applying a ramped voltage (e.g., from an RC network) to TRACK/SS forces the corresponding output to track that reference. This allows deterministic startup order-such as powering core before I/O-and eliminates dependency on external sequencers or firmware, enhancing system robustness in the LTM4644IY#PBF design.
What thermal monitoring capability does the LTM4644IY#PBF provide?
The LTM4644IY#PBF includes an on-die temperature diode accessible via the TEMP pin. By measuring the forward voltage drop across this diode (with a constant-current source), system designers can derive junction temperature with ±3°C accuracy. This enables real-time thermal monitoring, dynamic throttling, and predictive maintenance-especially valuable in fanless or sealed industrial enclosures where the LTM4644IY#PBF operates near thermal limits.
LTM4644IY#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- µModule®
- Package/Case:
- 77-BBGA Module
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- Non-Isolated PoL Module
- Number of Outputs:
- 4
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 14V
- Voltage - Output 1:
- 0.6 ~ 5.5V
- Voltage - Output 2:
- 0.6 ~ 5.5V
- Voltage - Output 3:
- 0.6 ~ 5.5V
- Voltage - Output 4:
- 0.6 ~ 5.5V
- Current - Output (Max):
- 4A, 4A, 4A, 4A
- Power (Watts):
- -
- Voltage - Isolation:
- -
- Applications:
- ITE (Commercial)
- Features:
- OCP, OTP, OVP
- Operating Temperature:
- -40°C ~ 125°C
- Efficiency:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 77-BGA (15x9)
- Control Features:
- -
- Approval Agency:
- -
- Standard Number:
- -
LTM4644IY#PBF FAQ
1.How can I place an order for LTM4644IY#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM4644IY#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTM4644IY#PBF reliable?
The price and inventory of LTM4644IY#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM4644IY#PBF is usually 5 days.
3.What payment methods are accepted for LTM4644IY#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM4644IY#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM4644IY#PBF?
LTM4644IY#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM4644IY#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTM4644IY#PBF?
For technical support, including LTM4644IY#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM4644IY#PBF requirements.
6.How does Aetrix verify that LTM4644IY#PBF is sourced from the original manufacturer or authorized distributors?
All LTM4644IY#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTM4644IY#PBF meets industry standards.
7.What is the process for return or replacement of LTM4644IY#PBF?
All LTM4644IY#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTM4644IY#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTM4644IY#PBF part is unused and in its original packaging.
Return procedure for LTM4644IY#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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