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Analog Devices Inc. LTM4638IY
- Part No.:
- LTM4638IY
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Converters
- Package:
- 49-BFBGA Module
- Datasheet:
-
LTM4638IY.pdf
- Description:
- 20VIN, 15A STEP-DOWN DC/DC UMODU
- Quantity:
- Payment:
- Shipping:
Inventory:1,048
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Product details
Overview
LTM4638IY from Analog Devices is a 15A, 3.1V–20V input, 0.6V–5.5V output µModule® step-down DC/DC regulator in a 6.25mm × 6.25mm × 5.02mm BGA package. It integrates controller, power FETs, inductor, and compensation circuitry, delivering ±1.5% total DC output voltage accuracy over line, load, and temperature. Designed for high-density point-of-load applications, it powers FPGA core rails, ASIC supplies, and telecom baseband processors.
For engineers reviewing the LTM4638IY datasheet, LTM4638IY pinout, LTM4638IY application, or LTM4638IY equivalent, key selection considerations include its 15A continuous output capability, differential remote sensing, selectable discontinuous mode, external frequency synchronization, and multiphase parallel current sharing support with other LTM4638 units.
Technical Context
The LTM4638IY employs constant-on-time valley current mode control with internal loop compensation (COMPa tied to COMPb), enabling fast transient response without external compensation. Its 600kHz default switching frequency is adjustable from 400kHz to 3MHz via the FREQ pin and supports external clock synchronization within ±30% of set frequency using MODE/CLKIN.
It features integrated thermal monitoring (TSENSE+/TSENSE–), overvoltage protection on VIN (trip at 24.5V), and open-drain PGOOD with ±8% FB window detection. Phase interleaving is programmable via PHMODE (INTVCC/GND/FLOAT) for 2-/3-/4-phase operation when paralleling multiple units.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 15A continuous DC output - supports high-current FPGA/ASIC core rails without external current sharing circuitry |
| Input Voltage Range | 3.1V to 20V - compatible with 3.3V, 5V, 12V intermediate bus architectures |
| Output Voltage Range | 0.6V to 5.5V - programmable via single resistor from FB to VOSNS–, covering DDR, CPU, GPU, and I/O supply requirements |
| Total DC Accuracy | ±1.5% over line, load, and temperature - ensures stable regulation under worst-case PCB layout and thermal conditions |
| Switching Frequency | 600kHz default, adjustable 400kHz–3MHz - balances efficiency, size, and EMI; enables synchronization to system clock |
| Package | 49-ball BGA, 6.25mm × 6.25mm × 5.02mm - ultra-compact footprint suitable for single-sided PCB layouts <1 cm² |
| Thermal Limits | Junction max 125°C; θJCbottom = 4.2°C/W - enables high-power density with bottom-side thermal pad attachment |
Pinout & Package
49-ball BGA package (6.25mm × 6.25mm × 5.02mm) with bottom thermal pad; RoHS-compliant SAC305 finish; MSL Level 3; operating temperature range –40°C to +125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (A1–A5, F3, G1–G3) | Power output terminals | Parallel-connected high-current outputs; require direct decoupling to adjacent GND balls for low-impedance return path |
| GND (B2, B6, C3–C7, D5–D7, E5–E7, F5–F7, G6–G7) | Power ground return | 18 dedicated ground balls - must be connected to large internal/external copper planes for thermal dissipation and noise control |
| VIN (D3–D4, E3–E4, F4, G4) | Input power supply | 4 dedicated input balls feeding top MOSFET drains and INTVCC regulator; require local 22µF ceramic decoupling per ball group |
| FB (C1) | Error amplifier inverting input | Internally tied to VOSNS+ via 60.4kΩ precision resistor; sets output voltage with external RFB to VOSNS– |
| TRACK/SS (E2) | Soft-start and voltage tracking | 6µA internal pull-up enables soft-start with capacitor; <0.6V enables rail sequencing by servoing FB to applied voltage |
| MODE/CLKIN (D2) | Mode select / sync input | Tie to GND for DCM; float or >1V for forced CCM; accept external clock for synchronization (100ns min pulse width) |
| PHMODE (G5) | Phase configuration | Set to INTVCC/GND/FLOAT for 2-/3-/4-phase interleaving when cascading multiple LTM4638IY units |
| PGOOD (B5) | Open-drain power-good indicator | Pulls low if FB deviates >±8% from 0.6V reference - used for system power sequencing and fault reporting |
Key Features
| Feature | Design Value |
|---|---|
| Differential remote sensing (VOSNS+/VOSNS–) | Compensates for IR drop across PCB traces up to 50mΩ, maintaining ±1.5% regulation at load point |
| Internal loop compensation (COMPa–COMPb) | Eliminates need for external compensation network - simplifies design and improves stability across ceramic output capacitor ranges |
| Multiphase parallel operation | Up to 4-phase interleaving via PHMODE and CLKOUT-to-MODE/CLKIN daisy chain - reduces input/output ripple current by factor of √N |
| Selectably discontinuous mode (DCM) | Enables >90% efficiency at light loads (<2A) by skipping switching cycles - extends battery life in standby modes |
| Overvoltage lockout on VIN | Shuts down top FETs at VIN >24.5V and resumes at 21.5V - protects against transient surges on intermediate bus without external TVS |
Applications
| FPGA Core Power Supply | Telecom Baseband Processor |
|---|---|
|
Use Scenario: Powers Xilinx Kintex Ultrascale+ FPGA core logic (VCCINT) requiring 0.85V @ 12A with tight voltage tolerance and fast load-step response. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering regulated 0.85V from 12V intermediate bus; manages dynamic current steps up to 6A/µs. Use Value: Internal current-mode control and 600kHz switching deliver <40µs settling time for 50% load transients - prevents logic errors during burst processing. |
Use Scenario: Supplies Marvell ARMADA 80x0 baseband processor core (VDD_CORE) at 1.0V/15A in 5G small cell radio unit with strict EMI limits. IC Role / Device Role / Timing Role: High-efficiency µModule regulator synchronized to system clock via MODE/CLKIN to shift switching noise out of sensitive IF bands. Use Value: External frequency synchronization and 4-phase interleaving reduce conducted EMI by 12dB compared to single-phase operation. |
| Data Center SSD Controller Rail | Medical Imaging ASIC Supply |
|
Use Scenario: Generates 1.2V @ 10A for NVMe SSD controller in enterprise storage rack, operating continuously at 70°C ambient. IC Role / Device Role / Timing Role: Thermally robust DC/DC module with bottom-side thermal pad and θJCbottom = 4.2°C/W - directly mounted to cold plate. Use Value: Guaranteed –40°C to +125°C operation and ±1.5% DC accuracy ensure reliable boot and sustained performance under thermal stress. |
Use Scenario: Powers CT scanner ASIC digital front-end at 1.8V/8A with zero output voltage drift during 30-minute imaging sequences. IC Role / Device Role / Timing Role: Precision-regulated supply with differential remote sensing compensating for 300mV IR drop across long flex cable between power module and ASIC. Use Value: Differential sensing maintains <±5mV regulation error at ASIC pins - avoids timing margin violations in high-speed SerDes links. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current µModule regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTM4650AIV#PBF | 25A output, dual-channel, 4.5V–26.5V input, larger 10.25mm × 11.25mm × 4.92mm LGA package | Higher current, dual-output capability; requires more PCB area and different thermal interface | Select when >15A per rail or dual independent outputs are needed; not pin-compatible |
| LTC3310SDE#TRPBF | 10A monolithic buck, 2.75V–5.5V input, 0.5V–VIN output, 3mm × 4mm QFN, no integrated inductor | Lower current, narrower input range, external inductor required - less complete solution | Choose for cost-sensitive, space-constrained designs where 10A suffices and inductor selection flexibility is preferred |
Compared with LTM4650AIV#PBF, the LTM4638IY offers higher power density and smaller footprint for 15A applications; versus LTC3310SDE#TRPBF, it delivers full integration and higher current but at greater unit cost and fixed inductance.
Availability
LTM4638IY is available at Aetrix Electronics and suitable for FPGA power delivery, telecom baseband supplies, data center SSD controllers, and medical imaging ASICs requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for LTM4638IY 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.
The LTM4638IY belongs to Analog Devices' µModule regulator product line - engineered to simplify high-current, high-efficiency power design by integrating magnetics, MOSFETs, and control circuitry into compact, thermally optimized packages.
FAQ
What is the maximum output current rating of the LTM4638IY?
The LTM4638IY is rated for 15A continuous DC output current at 125°C junction temperature with proper thermal management. Derating applies above 85°C ambient depending on VIN, VOUT, and PCB copper area. The device delivers this current with ≤±1.5% total DC output voltage error across line, load, and temperature.
Does the LTM4638IY require external compensation components?
No, the LTM4638IY uses internal loop compensation by default - simply tie COMPa to COMPb. This eliminates external RC networks and ensures stable operation with ceramic output capacitors ranging from 220µF to 470µF. Custom compensation is optional via external Type-II network on COMPa.
Can multiple LTM4638IY units be paralleled for higher current?
Yes, up to four LTM4638IY units can be paralleled using PHMODE and CLKOUT-to-MODE/CLKIN interconnection for 2-/3-/4-phase interleaving. Tie RUN, TRACK/SS, FB, and COMPa pins together across all units to ensure synchronized start-up, voltage tracking, and balanced current sharing.
What is the purpose of the TRACK/SS pin on the LTM4638IY?
The TRACK/SS pin on the LTM4638IY provides both output voltage tracking for supply rail sequencing and soft-start control. Applying a ramp voltage below 0.6V causes the regulator to servo FB to that voltage; adding a capacitor to ground creates a controlled voltage ramp for inrush current limiting during power-up.
Is the LTM4638IY RoHS compliant and what is its MSL rating?
Yes, the LTM4638IY#PBF variant uses SAC305 (SnAgCu) RoHS-compliant terminal finish and is rated MSL Level 3 per JEDEC J-STD-020. It requires bake conditioning only if exposed to ambient >30°C/60% RH for >168 hours prior to reflow - standard handling applies for typical SMT assembly.
LTM4638IY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- µModule®
- Package/Case:
- 49-BFBGA Module
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- Non-Isolated PoL Module
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.1V
- Voltage - Input (Max):
- 20V
- Voltage - Output 1:
- 0.6 ~ 5.5V
- Voltage - Output 2:
- -
- Voltage - Output 3:
- -
- Voltage - Output 4:
- -
- Current - Output (Max):
- 15A
- Power (Watts):
- -
- Voltage - Isolation:
- -
- Applications:
- ITE (Commercial)
- Features:
- Adjustable Output, Load Sharing, Remote On/Off, Remote Sense
- Operating Temperature:
- -40°C ~ 125°C (With Derating)
- Efficiency:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 49-BGA (6.25x6.25)
- Control Features:
- -
- Approval Agency:
- -
- Standard Number:
- -
LTM4638IY FAQ
1.How can I place an order for LTM4638IY through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM4638IY 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 LTM4638IY reliable?
The price and inventory of LTM4638IY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM4638IY is usually 5 days.
3.What payment methods are accepted for LTM4638IY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM4638IY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM4638IY?
LTM4638IY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM4638IY 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 LTM4638IY?
For technical support, including LTM4638IY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM4638IY requirements.
6.How does Aetrix verify that LTM4638IY is sourced from the original manufacturer or authorized distributors?
All LTM4638IY 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 LTM4638IY meets industry standards.
7.What is the process for return or replacement of LTM4638IY?
All LTM4638IY units undergo pre-shipment inspection (PSI). If there is an issue with LTM4638IY, 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 LTM4638IY part is unused and in its original packaging.
Return procedure for LTM4638IY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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