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Analog Devices Inc. LTM4604AIY
- Part No.:
- LTM4604AIY
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Converters
- Package:
- 66-BBGA Module
- Datasheet:
-
LTM4604AIY.pdf
- Description:
- DC DC CONVERTER 0.8-5V 20W
- Quantity:
- Payment:
- Shipping:
Inventory:3,974
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Product details
Overview
LTM4604AIY from Analog Devices is a 4A, 9mm × 15mm × 3.42mm BGA-packaged µModule step-down DC/DC regulator supporting 2.375V–5.5V input and 0.8V–5V programmable output voltage with ±1.75% total DC output error over –40°C to 125°C. It integrates controller, power FETs, inductor, and support components, requiring only external input/output capacitors. Used for high-density point-of-load regulation in telecom and server power rails.
For engineers reviewing the LTM4604AIY datasheet, LTM4604AIY pinout, LTM4604AIY application, or LTM4604AIY equivalent, key selection considerations include its 66-pin BGA package with SAC305 RoHS-compliant finish, 1.25MHz switching frequency, output voltage tracking capability, and thermal derating behavior under 0LFM–400LFM airflow conditions.
Technical Context
The LTM4604AIY employs constant-frequency current-mode control with internal compensation, enabling fast transient response (≤10µs settling time for 0%→50%→0% load steps) and inherent cycle-by-cycle current limiting. Its architecture supports parallel operation via shared COMP and FB pins, and output voltage tracking via the TRACK pin with external resistor dividers.
It features programmable soft-start (via RUN/SS pin), open-drain PGOOD monitoring (±7.5% window), foldback current protection, and thermal shutdown at ~150°C. The device operates across –40°C to 125°C internal temperature range and delivers up to 95% efficiency at 5VIN/1.5VOUT/4A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.375V to 5.5V - supports common intermediate bus voltages including 3.3V and 5V rails. |
| Output Current | 4A continuous, 5A peak - sufficient for FPGA core, ASIC I/O, or multi-core processor supply domains. |
| Output Voltage Range | 0.8V to 5V - set by single external resistor from FB to GND; default 0.8V with no resistor. |
| Switching Frequency | 1.25MHz - enables compact external filtering and reduces output capacitor count. |
| Total Output Error | ±1.75% over –40°C to 125°C - ensures stable regulation across industrial and telecom ambient extremes. |
| Quiescent Current | ≤7µA in shutdown - minimizes system standby power loss in always-on applications. |
| Package Dimensions | 9mm × 15mm × 3.42mm BGA - low-profile footprint compatible with bottom-side PCB space utilization. |
Pinout & Package
Package: 66-pin BGA (15mm × 9mm × 3.42mm), SAC305 (RoHS) ball finish, MSL Level 4, –40°C to 125°C operating temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (B1, C1, C3–C7, D7, E6, E7) | Power Input | Multiple dedicated input pins reduce trace inductance and improve high-current delivery; decoupling caps must be placed directly between these and GND. |
| VOUT (D8–D11, E8–E11, F6–F11, G6–G11) | Power Output | 18-pin parallel output path lowers conduction loss and thermal resistance; requires direct ceramic decoupling to GND. |
| GND (A1–A11, B6–B11, C8–C11, E4–E5, F3–F5, G3–G5) | Power Ground | Comprehensive ground array minimizes ground bounce and improves EMI performance in high-dI/dt switching. |
| FB (G2) | Feedback Input | Connects internally to VOUT via 4.99kΩ precision resistor; external RFB to GND sets output voltage per VOUT = 0.8V × (4.99k + RFB)/RFB. |
| RUN/SS (D1) | Enable & Soft-Start Control | 0.5V–0.8V threshold enables sequencing; 1MΩ pull-up + external capacitor sets soft-start ramp time (e.g., 0.01µF ≈ 1ms). |
| TRACK (E1) | Tracking Reference Input | Accepts external voltage divider from master regulator output to enable coincident or ratiometric voltage tracking of slave supplies. |
| PGOOD (F1) | Power Good Indicator | Open-drain output pulled low if VOUT deviates >±7.5% from regulation point - used for system power sequencing and fault reporting. |
| COMP (G1) | Compensation Node | Internal error amplifier compensation node; paralleling COMP pins across multiple LTM4604AIY units enables precise current sharing. |
| SW (B3, B4) | Switching Node | Exposed high-side switch node; may be connected to thermal pad or copper pour for enhanced heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Train | Complete buck solution with controller, MOSFETs, inductor, and compensation - eliminates layout-sensitive magnetics selection and loop tuning. |
| UltraFast Transient Response | ≤10µs settling time for 2A dynamic load steps - maintains tight regulation during FPGA/ASIC state transitions without external compensation. |
| Output Voltage Tracking | Supports master-slave sequencing via TRACK pin with <30mV droop during 0%→50%→0% load transients - critical for multi-rail SoC power-up/down coordination. |
| Parallel Operation Support | Current-mode architecture and shared COMP/FB nodes enable <±5% current mismatch across ≥3 paralleled LTM4604AIY units - scales output current while balancing thermal load. |
| Micropower Shutdown | 7µA IQ in shutdown - enables low-power retention modes in battery-backed or energy-harvesting systems without auxiliary regulators. |
Applications
| Telecom Point-of-Load | Server Memory Subsystem |
|---|---|
Use Scenario: Regulating 1.2V/1.5V/1.8V supply for high-speed SerDes PHYs and packet processing ASICs in 5G baseband units. IC Role / Device Role / Timing Role: Primary non-isolated buck converter delivering tightly regulated, low-noise core voltage with fast load-step response. Use Value: Maintains <±1.75% output accuracy across –40°C to 85°C ambient and achieves ≤25mV peak deviation during 2A/µs transients - prevents link training failures. | Use Scenario: Powering DDR4/DDR5 memory termination and VDDQ rails on enterprise server DIMMs with strict voltage sequencing requirements. IC Role / Device Role / Timing Role: Slave regulator synchronized to master VDD supply via TRACK pin for coincident ramp-up/ramp-down. Use Value: Enables <100ns inter-rail skew during power-on using external resistor-matched feedback networks - meets JEDEC JESD209-5 timing compliance. |
| Industrial PLC CPU Core | ATCA Carrier Card |
Use Scenario: Providing 0.85V–1.1V adaptive core voltage to ARM Cortex-A series processors in ruggedized programmable logic controllers. IC Role / Device Role / Timing Role: Standalone DC/DC module with programmable soft-start and PGOOD signaling for safe boot sequence control. Use Value: Delivers 4A continuous current with ≤7µA shutdown IQ and thermal shutdown at 150°C - ensures reliable operation in unventilated enclosures. | Use Scenario: Distributed 3.3V and 2.5V supplies across AdvancedTCA carrier cards with hot-swap and redundancy requirements. IC Role / Device Role / Timing Role: Paralleled LTM4604AIY units providing redundant 3.3V/4A outputs with automatic current sharing. Use Value: Achieves <±4% current imbalance across two modules without external current-sense resistors - simplifies redundancy design and reduces BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC µModule regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTM4604AEY#PBF | Same electrical specs; LGA package (9mm × 15mm × 2.32mm), 0.630mm pads, SnPb/RoHS optional. | LGA allows reworkability and avoids BGA solder void risks; lower profile suits ultra-thin assemblies. | Select LTM4604AEY#PBF when board assembly uses reflow-only processes or requires easier visual inspection of solder joints. |
| LTM4624IY#PBF | Successor generation: 4A, 1.5MHz, improved efficiency (up to 96%), smaller 6.25mm × 6.25mm × 1.82mm BGA, integrated telemetry. | Includes PMBus interface for voltage/current/temperature readback; not pin-compatible with LTM4604AIY. | Select LTM4624IY#PBF when digital monitoring, higher density, or extended efficiency at light loads is required - redesign needed. |
Compared with LTM4604AEY#PBF, the LTM4604AIY offers identical regulation performance but trades reworkability for higher thermal conductivity via BGA solder balls; compared with LTM4624IY#PBF, it lacks telemetry but provides proven field reliability and drop-in compatibility in legacy designs.
Availability
LTM4604AIY is available at Aetrix Electronics and suitable for telecom infrastructure, server power distribution, and industrial embedded systems requiring stable component supply with full industrial temperature grade (–40°C to 125°C) and RoHS compliance.
Supply support for LTM4604AIY 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 LTM4604AIY belongs to the µModule regulator product line, designed to simplify power system design by integrating magnetics, MOSFETs, and control circuitry into compact, thermally enhanced packages for demanding point-of-load applications.
FAQ
What is the maximum output current capability of the LTM4604AIY under continuous operation?
The LTM4604AIY delivers 4A continuous output current across its full operating temperature range (–40°C to 125°C) when used with appropriate thermal management - such as 200LFM airflow or a BGA heat sink. Peak current capability reaches 5A for short durations, but sustained operation above 4A requires derating based on ambient temperature and airflow, as defined in Figures 6–13 of the official datasheet. The LTM4604AIY's current foldback protection activates if output voltage drops significantly under overload.
Does the LTM4604AIY support output voltage tracking, and how is it implemented?
Yes, the LTM4604AIY supports precise output voltage tracking via its dedicated TRACK pin (E1). To implement coincident tracking, an external resistor divider replicates the slave's feedback network and connects its midpoint to the TRACK pin. The master regulator's output must exceed the slave's target voltage. Load current must be present for proper tracking behavior. The LTM4604AIY's internal 4.99kΩ top feedback resistor ensures accurate ratio matching - critical for sequencing multi-rail SoCs where LTM4604AIY serves as the slave regulator.
What package type and finish does the LTM4604AIY use, and what are its assembly implications?
The LTM4604AIY uses a 66-pin BGA package measuring 9mm × 15mm × 3.42mm with SAC305 (SnAgCu) RoHS-compliant solder balls and MSL Level 4 moisture sensitivity. Its peak reflow temperature rating is 245°C. This BGA variant offers superior thermal performance versus the LGA version due to direct solder-ball thermal paths to the PCB, but requires controlled reflow profiling and X-ray inspection for void detection. The LTM4604AIY's BGA footprint is not interchangeable with LGA variants like LTM4604AEY#PBF.
How does the LTM4604AIY achieve stability without external compensation components?
The LTM4604AIY incorporates fully internal compensation optimized for all supported output voltages (0.8V–5V) and typical ceramic output capacitor ranges (22µF–100µF). Its current-mode control architecture and pre-tuned error amplifier eliminate the need for external RC networks on the COMP pin. Stability margins are verified across input voltages (2.375V–5.5V), load currents (0–4A), and temperatures (–40°C–125°C). External compensation is only required for non-standard capacitor ESR or extreme layout parasitics - addressed using Analog Devices' LTpowerCAD® design tool.
Can multiple LTM4604AIY units be operated in parallel, and what is required to ensure balanced current sharing?
Yes, multiple LTM4604AIY units can be paralleled for higher current capacity. Current sharing is achieved by connecting the COMP and FB pins of all modules together - leveraging their inherent current-mode control and matched internal gain. No external current-sense resistors or master-slave configuration is needed. With proper PCB layout (matched trace lengths, symmetric thermal coupling), current imbalance remains within ±5% across up to three paralleled LTM4604AIY units. Derating curves in the datasheet must be applied cumulatively to total output current.
LTM4604AIY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- µModule®
- Package/Case:
- 66-BBGA Module
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- Non-Isolated PoL Module
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.375V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output 1:
- 0.8 ~ 5V
- Voltage - Output 2:
- -
- Voltage - Output 3:
- -
- Voltage - Output 4:
- -
- Current - Output (Max):
- 4A
- Power (Watts):
- -
- Voltage - Isolation:
- -
- Applications:
- ITE (Commercial)
- Features:
- OCP, OTP, UVLO
- Operating Temperature:
- -40°C ~ 125°C
- Efficiency:
- 95%
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 66-BGA (15x9)
- Control Features:
- -
- Approval Agency:
- -
- Standard Number:
- -
LTM4604AIY FAQ
1.How can I place an order for LTM4604AIY through Aetrix?
Please submit a Request for Quotation (RFQ) for LTM4604AIY 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 LTM4604AIY reliable?
The price and inventory of LTM4604AIY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTM4604AIY is usually 5 days.
3.What payment methods are accepted for LTM4604AIY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTM4604AIY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTM4604AIY?
LTM4604AIY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTM4604AIY 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 LTM4604AIY?
For technical support, including LTM4604AIY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTM4604AIY requirements.
6.How does Aetrix verify that LTM4604AIY is sourced from the original manufacturer or authorized distributors?
All LTM4604AIY 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 LTM4604AIY meets industry standards.
7.What is the process for return or replacement of LTM4604AIY?
All LTM4604AIY units undergo pre-shipment inspection (PSI). If there is an issue with LTM4604AIY, 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 LTM4604AIY part is unused and in its original packaging.
Return procedure for LTM4604AIY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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