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Analog Devices Inc./Maxim Integrated MAX15035ETL+
- Part No.:
- MAX15035ETL+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
MAX15035ETL+.pdf
- Description:
- IC REG BUCK ADJ 15A 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,303
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Product details
Overview
The MAX15035ETL+ from Maxim Integrated is a 15A synchronous step-down DC-DC regulator with integrated high- and low-side MOSFETs, operating from 4.5V to 26V input and delivering dynamically adjustable output voltages from 0V to 0.9×VIN. It features Quick-PWM™ control (100ns load-step response), programmable switching frequency (200–600kHz), ±0.5% output voltage accuracy over line/load/temperature, and valley current-limit protection with thermal compensation. It targets GPU core supplies and DDR memory rails requiring high power density and monotonic startup into precharged outputs.
For engineers reviewing the MAX15035ETL+ datasheet, MAX15035ETL+ pinout, MAX15035ETL+ application, or MAX15035ETL+ equivalent, key selection considerations include its 40-pin TQFN (6mm × 6mm) package, REFIN-based dynamic voltage scaling, ultrasonic/skip/PWM mode selection via SKIP pin, valley-current sensing architecture, and integrated fault protections (OVP/UVP/thermal shutdown).
Technical Context
The MAX15035ETL+ implements Maxim's proprietary Quick-PWM™ constant-on-time control with input feed-forward, enabling stable operation across wide VIN/VOUT ratios (e.g., 12V→1.05V) while maintaining near-constant frequency. Its on-time is calculated as tON = tSW × (VFB/VIN), set by RTON (97.5kΩ–302.5kΩ) between TON and IN, yielding 200kHz/300kHz/600kHz nominal frequencies.
Current limiting uses valley-sensing across the synchronous rectifier, with ILIM pin accepting 0.4V–2.0V to set thresholds from 17mV to 110mV (i.e., 340mA–2.2A sensed differential), supporting foldback or NTC-compensated protection. Soft-start/soft-shutdown is voltage-controlled, ensuring monotonic VOUT ramping and predictable timing without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 26V - supports wide industrial/server input rails including 5V, 12V, and 24V systems. |
| Output Current Rating | 15A continuous - enables single-chip solutions for GPU core and DDR VDDQ supplies without external MOSFETs. |
| Output Voltage Accuracy | ±0.5% over line/load/temperature - ensures tight regulation for sensitive digital loads like DDR memory interfaces. |
| Switching Frequency | 200kHz to 600kHz (programmable via RTON) - balances efficiency vs. size: 200kHz maximizes efficiency; 600kHz minimizes inductor/capacitor footprint. |
| Load Transient Response | 100ns instant-on - recovers from 1A→8A steps within 20µs with <20mV droop, critical for burst-mode CPU/GPU loads. |
| Protection Features | OVP (±300mV trip), UVP (±200mV trip), thermal shutdown (160°C), soft-start/shutdown - eliminates need for external supervisors in PoL designs. |
| Package | 40-pin TQFN, 6mm × 6mm - thermally enhanced layout with three exposed pads (EP1/EP2/EP3) for AGND/LX/IN power routing. |
Pinout & Package
The MAX15035ETL+ is housed in a 40-pin, 6mm × 6mm thin quad flat no-lead (TQFN) package with three internal exposed pads: EP1 (AGND), EP2 (LX), and EP3 (IN). This thermally optimized construction supports high-current operation with low thermal resistance to PCB copper planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 2) | Shutdown control input | Pull low to enter 2µA shutdown; enables monotonic soft-shutdown and fault-latch clearing. |
| REFIN (Pin 34) | Dynamic reference input | Sets target VFB from 0V to 2.0V; enables real-time output voltage scaling (e.g., 1.5V ↔ 1.05V) during operation. |
| ILIM (Pin 33) | Valley current-limit threshold adjust | Voltage input (0.4V–2.0V) scaled 1:20 to set current-sense threshold (17–110mV), supporting thermal foldback or heatsink-aware limits. |
| SKIP (Pin 36) | Operating mode selector | Four-level logic: GND/REF (skip), open (ultrasonic), VDD (forced PWM) - selects efficiency vs. noise trade-off without firmware. |
| TON (Pin 29) | Frequency-setting input | Resistor-to-IN sets tSW; 200kΩ yields ~300kHz - enables precise frequency tuning independent of input/output conditions. |
| PGOOD (Pin 38) | Open-drain power-good output | Asserts high-Z when VOUT is within ±200mV/±300mV of VREFIN; blanked during REFIN transitions to avoid false faults. |
Key Features
| Feature | Design Value |
|---|---|
| Quick-PWM™ control | 100ns instantaneous load-step response with frequency stability across 4.5V–26V input, eliminating need for complex loop compensation. |
| Dynamically adjustable VOUT | REFIN pin accepts 0–2.0V to set VFB, enabling seamless voltage scaling (e.g., GPU DVFS) without changing feedback resistors. |
| Valley current-limit protection | ILIM pin allows precise, thermally compensated current limiting (340mA–2.2A equivalent) using external NTC or voltage dividers. |
| No external compensation required | Stable with polymer/tantalum capacitors; ceramic caps supported via optional external compensation - reduces BOM count and design risk. |
| Monotonic precharged startup | Voltage-controlled soft-start ensures VOUT ramps cleanly even when output capacitors are precharged - prevents reverse current and system reset. |
Applications
| GPU Core Supply | DDR Memory VDDQ/VTT |
|---|---|
Use Scenario: Powering NVIDIA/AMD GPU cores requiring rapid voltage scaling and high transient current (up to 15A) during compute bursts. IC Role / Device Role / Timing Role: Primary step-down regulator with integrated MOSFETs, delivering dynamically adjusted 0.8–1.2V at up to 15A with sub-20µs transient recovery. Use Value: Eliminates external high-side/low-side drivers and discrete current-sense resistors, reducing solution size by >30% versus controller + external FETs. | Use Scenario: Generating tightly regulated 1.2V/1.35V VDDQ or 0.6V VTT rails for DDR4/DDR5 memory subsystems in servers and workstations. IC Role / Device Role / Timing Role: Synchronous buck regulator with ±0.5% accuracy and monotonic startup into precharged memory bus capacitance. Use Value: Ensures signal integrity by preventing undershoot/overshoot during memory initialization and avoiding data corruption on hot-plug events. |
| Server Point-of-Load | Storage Power Supply |
Use Scenario: Distributed 1.05V/1.5V rails for ASICs, FPGAs, or PCIe controllers in 1U/2U rack servers where board space and thermal management are constrained. IC Role / Device Role / Timing Role: High-power-density PoL converter with 40-pin TQFN package and three exposed thermal pads for direct PCB copper sinking. Use Value: Achieves >90% peak efficiency at 12V→1.05V/15A, reducing heat sink requirements and enabling fanless operation in edge storage nodes. | Use Scenario: Powering NVMe SSD controllers and NAND flash in enterprise storage enclosures requiring robust OVP/UVP and thermal fault handling. IC Role / Device Role / Timing Role: Fault-protected step-down regulator with PGOOD window comparator, OVP (±300mV), UVP (±200mV), and 160°C thermal shutdown. Use Value: Prevents SSD data loss during input surge or thermal runaway by latching off and asserting PGOOD low before catastrophic failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2451DT-LF-Z | 3A rated, external MOSFETs required; fixed 500kHz frequency; no REFIN or valley current limit. | Suitable only for ≤3A loads; lacks dynamic voltage scaling and advanced protection - requires external current sense and supervisor ICs. | Select only for cost-sensitive, low-current (<3A), fixed-VOUT applications where board space is not constrained. |
| TPS546D24RQFPR | 15A, PMBus-enabled, 40-pin QFN; supports AVSBus, telemetry, and digital loop tuning - no Quick-PWM architecture. | Targets systems needing real-time telemetry and firmware-configurable margins; higher BOM cost and firmware dependency. | Choose when digital monitoring, adaptive voltage scaling, or multi-rail coordination via PMBus is required - not for analog-only designs. |
Compared with MP2451DT-LF-Z and TPS546D24RQFPR, the MAX15035ETL+ delivers unique analog-dynamic voltage scaling via REFIN, 100ns transient response without digital overhead, and integrated valley-current protection - making it optimal for high-performance analog PoL where simplicity, speed, and thermal resilience are prioritized over telemetry.
Availability
The MAX15035ETL+ is available at Aetrix Electronics and suitable for server computers, GPU core supplies, and DDR memory power rails requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX15035ETL+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, computing, and communications applications.
The MAX15035ETL+ belongs to Maxim's high-current, high-efficiency DC-DC regulator product line, engineered specifically for server, GPU, and DDR memory point-of-load applications where dynamic voltage scaling, fast transient response, and thermal robustness are critical.
FAQ
What input voltage range does the MAX15035ETL+ support?
The MAX15035ETL+ supports an input voltage range of 4.5V to 26V, enabling use across diverse power rails including 5V bias supplies, 12V server backplanes, and 24V industrial inputs. Absolute maximum rating is +28V on IN-to-PGND, with internal protection circuitry preventing damage during brief overvoltage transients. This wide range allows the MAX15035ETL+ to serve as a universal PoL solution in multi-rail systems without redesign.
How does the MAX15035ETL+ achieve 100ns load-step response?
The MAX15035ETL+ achieves 100ns load-step response through its proprietary Quick-PWM™ constant-on-time architecture, which eliminates reliance on error-amplifier loop bandwidth. Instead, the on-time is directly calculated from VFB/VIN in real time, allowing immediate duty-cycle adjustment upon load change. This architecture, combined with valley-current sensing and zero-latency fault blanking, ensures the MAX15035ETL+ recovers from 1A→8A steps within 20µs while maintaining regulation.
Can the MAX15035ETL+ operate with ceramic output capacitors?
Yes, the MAX15035ETL+ supports ceramic output capacitors, but requires external compensation (a series RC network from FB to AGND) to ensure stability due to their near-zero ESR. In contrast, polymer and tantalum capacitors provide sufficient ESR for inherent stability without added components. The MAX15035ETL+'s architecture is explicitly validated with 330µF/6mΩ polymer and 330µF/18mΩ tantalum capacitors per the datasheet's Table 1.
What is the function of the REFIN pin on the MAX15035ETL+?
The REFIN pin on the MAX15035ETL+ sets the target feedback voltage (VFB = VREFIN) from 0V to 2.0V, enabling dynamic output voltage adjustment during operation - for example, scaling GPU core voltage from 1.2V to 0.8V under light load. It also triggers internal fault blanking during transitions to prevent false PGOOD asserts or OVP/UVP trips, making the MAX15035ETL+ ideal for DVFS implementations without external DACs or sequencers.
Does the MAX15035ETL+ require an external 5V bias supply?
Yes, the MAX15035ETL+ requires an external 5V bias supply connected to both VDD and VCC pins. VDD powers the gate drivers (supporting up to 15A switch currents), while VCC supplies the analog control circuitry. An internal 20Ω resistor connects VDD to VCC, simplifying layout. The MAX15035ETL+ draws 0.7–1.2mA quiescent current from VDD under normal operation, and 0.1µA in shutdown - confirming that the 5V rail must be independently generated or derived from the main input via a dedicated LDO.
MAX15035ETL+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 0V
- Voltage - Output (Max):
- 23.4V
- Current - Output:
- 15A
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TQFN (6x6)
MAX15035ETL+ FAQ
1.How can I place an order for MAX15035ETL+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX15035ETL+ 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 MAX15035ETL+ reliable?
The price and inventory of MAX15035ETL+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX15035ETL+ is usually 5 days.
3.What payment methods are accepted for MAX15035ETL+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX15035ETL+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX15035ETL+?
MAX15035ETL+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX15035ETL+ 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 MAX15035ETL+?
For technical support, including MAX15035ETL+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX15035ETL+ requirements.
6.How does Aetrix verify that MAX15035ETL+ is sourced from the original manufacturer or authorized distributors?
All MAX15035ETL+ 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 MAX15035ETL+ meets industry standards.
7.What is the process for return or replacement of MAX15035ETL+?
All MAX15035ETL+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX15035ETL+, 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 MAX15035ETL+ part is unused and in its original packaging.
Return procedure for MAX15035ETL+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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