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Analog Devices Inc. LTM4628EV#PBF
- Part No.:
- LTM4628EV#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Converters
- Package:
- 144-BLGA Module
- Datasheet:
-
LTM4628EV#PBF.pdf
- Description:
- DC DC CNVRTR 0.6-5.5V 0.6-5.5V
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTM4628EV#PBF from Analog Devices is a dual-output µModule® DC/DC regulator delivering 8A per channel or 16A in 2-phase single-output mode, operating from 4.5V to 26.5V input and supporting 0.6V–5.5V programmable outputs with ±1.5% total DC error and fast transient response enabled by current-mode control. It integrates controller, power FETs, inductor, and support components in a thermally enhanced 15mm × 15mm × 4.32mm LGA package, used in telecom power supplies requiring tight rail sequencing and high-density board layouts.
For engineers reviewing the LTM4628EV#PBF datasheet, LTM4628EV#PBF pinout, LTM4628EV#PBF application, or LTM4628EV#PBF equivalent, key selection criteria include dual 8A output capability, differential remote sensing for 1.2V/1.5V rail accuracy, multiphase parallel operation support, and thermal monitoring via onboard temperature diode - all critical for ATCA card and industrial embedded power design.
Technical Context
The LTM4628EV#PBF implements two independent current-mode synchronous buck regulators with internal compensation, enabling stable operation across ceramic-only output capacitors and wide VIN/VOUT combinations. Its architecture supports frequency synchronization (400–750 kHz), phase-controlled CLKOUT for up to 12-phase interleaving, and selectable Burst Mode® or pulse-skipping for light-load efficiency.
Each channel features dedicated RUN, TRACK, PGOOD, and VFB pins, with integrated differential remote sense amplifier (DIFFP/DIFFN/DIFFOUT) supporting accurate load-point regulation for outputs between 0.6V and 3.3V. The device includes overvoltage lockout (0.64–0.68V at VFB), foldback overcurrent protection (15A peak), and internal 5V INTVCC regulator powered from VIN or EXTVCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 26.5V - supports wide-range industrial and telecom inputs without external pre-regulation |
| Output Current (per channel) | 8A continuous - enables dual-rail 1.2V/1.5V supply for FPGA or ASIC core/logic domains |
| Output Voltage Range | 0.6V to 5.5V - programmable via single external resistor, covering DDR, CPU, and I/O rail requirements |
| Total DC Output Error | ±1.5% - ensures tight regulation under line/load/temperature variation for sensitive digital loads |
| Switching Frequency | 400–750 kHz - adjustable via fSET pin or external SYNC, balancing EMI and efficiency in dense PCB layouts |
| Thermal Protection | Onboard temperature diode (TEMP pin) - enables real-time junction monitoring without external sensors |
| Package Dimensions | 15mm × 15mm × 4.32mm LGA - surface-mount footprint with low-profile height for constrained chassis designs |
Pinout & Package
The LTM4628EV#PBF uses a 144-lead LGA package (15mm × 15mm × 4.32mm) with exposed thermal pad on bottom. Pin functions are defined per Analog Devices Rev. F datasheet, with dedicated power, ground, control, and feedback terminals arranged in grid layout (A1–M12).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT1 (A1–C4, B1–B5) | Main output 1 power terminal | Delivers regulated 1.5V/8A; requires direct decoupling to adjacent GND pins for low-impedance return path |
| VOUT2 (A8–C12, B8–B12) | Main output 2 power terminal | Delivers regulated 1.2V/8A; electrically isolated from VOUT1 but shares thermal substrate |
| VFB1 / VFB2 (D5 / D7) | Negative input of error amplifier | Accepts 0.6V reference; sets output voltage with external resistor (e.g., 40.2kΩ for 1.5V); max ±20nA leakage |
| TRACK1 / TRACK2 (E5 / D8) | Soft-start and rail-tracking input | 1.3µA pull-up enables controlled ramp-up; supports coincident sequencing of 1.2V/1.5V rails via voltage divider |
| MODE_PLLIN (F4) | Mode selection & sync input | Selects Burst Mode® (float), pulse-skipping (INTVCC), or forced continuous (GND); accepts external clock for phase locking |
| DIFFP / DIFFN (E8 / E9) | Differential remote sense inputs | Enable load-point regulation for outputs 0.6–3.3V; require Kelvin connection to load for <1% sensing error |
| TEMP (J6) | On-die temperature diode anode | Outputs VBE proportional to die temperature; used with external circuit for thermal shutdown or margining |
| PGOOD1 / PGOOD2 (G9 / G8) | Open-drain power-good indicators | Pull low if output deviates >±7.5% from setpoint; drive external enable logic or FPGA reset lines |
Key Features
| Feature | Design Value |
|---|---|
| Dual 8A or single 16A 2-phase output | Enables flexible power architecture: independent rails for core/I/O or combined high-current rail for GPU/FPGA |
| Differential remote sense amplifier | Compensates for PCB IR drop up to 3.3V outputs, maintaining ±1.5% regulation at load point |
| Multiphase parallel current sharing | Supports up to 12-phase interleaving using MODE_PLLIN/PHASMD/CLKOUT for <10mV ripple at 32A |
| Adjustable soft-start and voltage tracking | Prevents inrush and ensures ordered startup of 1.2V/1.5V rails via capacitor-based ramp and resistive divider |
| Burst Mode® and pulse-skipping operation | Extends battery life in portable systems: maintains >85% efficiency at 1mA load for 1.2V output |
| Internal temperature diode and OVP/OCP | Reduces BOM count: eliminates need for external thermal sensor or discrete protection ICs |
Applications
| Telecom Baseband Processing | Industrial PLC Power Management |
|---|---|
Use Scenario: Dual-rail power for FPGA-based baseband processors in 5G radio units requiring simultaneous 1.2V core and 1.5V I/O with strict sequencing. IC Role / Device Role / Timing Role: Primary DC/DC regulator providing tightly tracked 1.2V/1.5V outputs with <5ms turn-on time and ±7.5% PGOOD window. Use Value: Eliminates external sequencing IC and reduces layout area by 40% vs discrete controller+MOSFET+inductor solutions. | Use Scenario: Compact 24V-to-1.2V/1.5V conversion in DIN-rail mounted PLC CPUs where thermal dissipation and EMI must be minimized. IC Role / Device Role / Timing Role: Standalone µModule delivering 8A/channel with integrated inductor and thermal monitoring via TEMP pin. Use Value: Achieves 92% peak efficiency at 12VIN/1.5VOUT, reducing heatsink size and enabling convection-only cooling. |
| ATCA Carrier Card Power | High-Density Storage Controller |
Use Scenario: Powering multiple hot-swappable ATCA blades with synchronized 1.2V/1.5V rails and fault isolation per slot. IC Role / Device Role / Timing Role: Dual-channel regulator with independent RUN/PGOOD pins enabling per-blade enable/disable and status reporting. Use Value: Supports multiphase parallel operation across blades, lowering input ripple by 70% and easing front-panel EMI filtering. | Use Scenario: NVMe SSD controller power in enterprise storage enclosures requiring ultra-low noise 1.2V core rail with fast load transient response. IC Role / Device Role / Timing Role: High-bandwidth current-mode regulator with 20µs settling time for 50% load steps, minimizing voltage droop during burst writes. Use Value: Maintains <30mV peak deviation under 4A/µs load transients, preventing controller reset during sustained I/O operations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output µModule regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTM4644IY#PBF | Quad 4A output, 16mm × 16mm BGA, supports 0.6–3.3V only, no differential remote sense | Better suited for quad-rail systems (e.g., memory + core + I/O + aux) but lacks load-point sensing for precision rails | Select when needing four independent outputs instead of dual high-current rails |
| LTM4650AIV#PBF | Single 50A output, 16mm × 16mm LGA, 0.6–3.3V range, integrated PMBus interface | Targeted at high-current single-rail applications (e.g., AI accelerator cores) with digital telemetry, not dual-rail sequencing | Select when digital monitoring and >16A single-rail capability outweigh dual-output flexibility |
Compared with LTM4628EV#PBF, LTM4644IY#PBF offers greater output count but sacrifices remote sensing and rail-tracking precision, while LTM4650AIV#PBF provides higher single-rail current and digital control at the cost of dual-output functionality and analog sequencing support.
Availability
LTM4628EV#PBF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and high-density storage controllers requiring stable component supply, RoHS-compliant LGA packaging, and guaranteed –40°C to 125°C operating range.
Supply support for LTM4628EV#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 is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power and signal chain solutions.
The LTM4628EV#PBF belongs to the µModule® regulator product line, designed to simplify high-current DC/DC design by integrating magnetics and control in compact, thermally optimized packages for space-constrained embedded systems.
FAQ
What is the maximum output current per channel for the LTM4628EV#PBF?
The LTM4628EV#PBF delivers 8A continuous current per channel at 1.5V output with 12V input, verified across the full –40°C to 125°C internal temperature range. Peak current capability is 15A per channel under overcurrent foldback conditions, as specified in the Electrical Characteristics table on page 3 of the Rev. F datasheet.
Does the LTM4628EV#PBF support remote voltage sensing?
Yes, the LTM4628EV#PBF includes a dedicated differential remote sense amplifier (DIFFP/DIFFN/DIFFOUT pins) supporting accurate load-point regulation for outputs between 0.6V and 3.3V. When enabled, it compensates for PCB trace resistance, maintaining ±1.5% total DC error at the load rather than at the module pins.
Can the LTM4628EV#PBF operate in single-output 16A mode?
Yes, the LTM4628EV#PBF can be configured for single 16A 2-phase operation by connecting VFB1 and VFB2 together with one programming resistor, paralleling COMP1 and COMP2, and synchronizing PHASMD pins. This configuration reduces output ripple by interleaving and increases current capacity while retaining fast transient response.
What is the purpose of the MODE_PLLIN pin on the LTM4628EV#PBF?
The MODE_PLLIN pin on the LTM4628EV#PBF serves three functions: selecting light-load operation mode (Burst Mode® when floating, pulse-skipping when tied to INTVCC, forced continuous when grounded), and acting as an external synchronization input for phase-locking multiple modules. It directly controls switching behavior without requiring external logic.
How does the LTM4628EV#PBF handle thermal monitoring?
The LTM4628EV#PBF integrates an on-die temperature diode connected to the TEMP pin, providing a VBE-based analog output proportional to junction temperature. Engineers use this with an external circuit (e.g., comparator or ADC) to implement thermal shutdown, derating, or system-level temperature margining without adding discrete sensors.
LTM4628EV#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- µModule®
- Package/Case:
- 144-BLGA Module
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- Non-Isolated PoL Module
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 26.5V
- Voltage - Output 1:
- 0.6 ~ 5.5V
- Voltage - Output 2:
- 0.6 ~ 5.5V
- Voltage - Output 3:
- -
- Voltage - Output 4:
- -
- Current - Output (Max):
- 8A, 8A
- Power (Watts):
- -
- Voltage - Isolation:
- -
- Applications:
- ITE (Commercial)
- Features:
- OCP, OVP, UVLO
- Operating Temperature:
- -40°C ~ 125°C
- Efficiency:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 144-LGA (15x15)
- Control Features:
- -
- Approval Agency:
- -
- Standard Number:
- -
LTM4628EV#PBF FAQ
1.How can I place an order for LTM4628EV#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM4628EV#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 LTM4628EV#PBF reliable?
The price and inventory of LTM4628EV#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM4628EV#PBF is usually 5 days.
3.What payment methods are accepted for LTM4628EV#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM4628EV#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM4628EV#PBF?
LTM4628EV#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM4628EV#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 LTM4628EV#PBF?
For technical support, including LTM4628EV#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM4628EV#PBF requirements.
6.How does Aetrix verify that LTM4628EV#PBF is sourced from the original manufacturer or authorized distributors?
All LTM4628EV#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 LTM4628EV#PBF meets industry standards.
7.What is the process for return or replacement of LTM4628EV#PBF?
All LTM4628EV#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTM4628EV#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 LTM4628EV#PBF part is unused and in its original packaging.
Return procedure for LTM4628EV#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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