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Analog Devices Inc./Maxim Integrated MAX15035ETL+T
- Part No.:
- MAX15035ETL+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
MAX15035ETL+T.pdf
- Description:
- IC REG BUCK ADJ 15A 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,853
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Product details
Overview
The MAX15035ETL+T 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 powers GPU core rails and DDR VDDQ/VTT in server and high-density computing systems.
For engineers reviewing the MAX15035ETL+T datasheet, MAX15035ETL+T pinout, MAX15035ETL+T application, or MAX15035ETL+T equivalent, this page delivers verified technical context, validated pin functions, confirmed package dimensions (6mm × 6mm TQFN-40), real-world efficiency curves across 1.05V/1.5V/3.3V outputs, and two rigorously cross-checked alternative regulators for point-of-load designs requiring high power density and fast transient immunity.
Technical Context
The MAX15035ETL+T implements Maxim's proprietary Quick-PWM™ architecture-a voltage-feed-forward, constant-on-time control scheme that maintains stable switching frequency across wide VIN/VOUT ratios while achieving 100ns instantaneous response to load transients. Its on-time (tON) is calculated as tSW × (VFB/VIN), where tSW is set by an external resistor on the TON pin (97.5kΩ–302.5kΩ) and CTON = 16.26pF.
Current sensing occurs across the synchronous rectifier using valley-current detection, enabling low-cost, high-efficiency overcurrent protection. The ILIM pin accepts 0.4V–2.0V inputs to set current-limit thresholds from 18mV to 108mV (i.e., 360mA–2.16A sensed differential), supporting foldback or thermally compensated schemes via NTC-derived voltage dividers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 26V - supports 12V/24V server rails and wide industrial input sources without pre-regulation. |
| Output Current | 15A continuous - rated at TA = +70°C with 20A PGND RMS current handling for high-current PCB routing. |
| Switching Frequency | 200kHz to 600kHz - selectable via RTON; 600kHz minimizes inductor/capacitor size; 200kHz maximizes efficiency at full load. |
| Output Voltage Accuracy | ±0.5% over line, load, and temperature - ensures tight regulation for GPU core and DDR memory supply compliance. |
| Load Transient Response | 100ns instant-on - enables stable operation during rapid GPU workload changes without output droop/surge exceeding ±20mV. |
| Protection Features | OVP (+300mV trip), UVP (−200mV trip), thermal shutdown (160°C), soft-start/soft-shutdown - prevents damage during startup, overload, or thermal stress. |
| Package | 40-pin TQFN (6mm × 6mm, 0.5mm pitch) - exposes three EP pads (AGND/LX/IN) for optimal thermal dissipation and low-inductance power paths. |
Pinout & Package
MAX15035ETL+T is housed in a 40-pin, 6mm × 6mm thin quad flat no-lead (TQFN) package with three exposed thermal pads (EP1 = AGND, EP2 = LX, EP3 = IN) for enhanced thermal performance and low-impedance grounding/power routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 2) | Shutdown Control Input | Pull low to enter 2µA shutdown; toggling clears fault latches; enables monotonic power-up into precharged outputs. |
| FB (Pin 32) | Feedback Voltage Sense | Direct connection to output capacitor positive terminal; senses VOUT to regulate high-side on-time; supports ceramic/polymer/tantalum caps without external compensation. |
| REFIN (Pin 34) | Dynamic Reference Input | Sets target VFB from 0V to 2.0V; enables dynamic output voltage scaling (e.g., GPU DVFS); blanked during transitions to suppress PGOOD faults. |
| ILIM (Pin 33) | Valley Current-Limit Threshold | Voltage input (0.4V–2.0V) scaled ×0.05 to set current-sense threshold (18–108mV); supports thermal foldback via NTC-based divider. |
| TON (Pin 29) | Switching Frequency Set | Resistor from IN to TON sets fSW: 97.5kΩ = 600kHz, 200kΩ = 300kHz, 302.5kΩ = 200kHz; internal 16.26pF timing capacitor. |
| LX (Pins 5,16,EP2) | Inductor Switch Node | Connects to switched side of power inductor; carries high di/dt currents; EP2 provides low-inductance path to internal MOSFET drains/sources. |
| IN (Pins 18–26,EP3) | Main Power Input | High-current input path (15A RMS) tied to high-side MOSFET drain; EP3 enables direct thermal coupling to PCB copper pour. |
| PGOOD (Pin 38) | Open-Drain Power-Good Output | Asserts high-impedance when VOUT is within ±200mV/±300mV of VREFIN; blanked during REFIN transitions to avoid false faults. |
Key Features
| Feature | Design Value |
|---|---|
| Quick-PWM™ Control | Delivers 100ns load-step response while maintaining stable switching frequency across 4.5V–26V input and 0.5V–3.3V output ranges. |
| Dynamically Adjustable Output | REFIN pin accepts 0–2.0V input to scale regulated output from 0V to 0.9×VIN; supports GPU DVFS and multi-rail sequencing. |
| Valley Current-Limit Protection | Adjustable 18–108mV threshold via ILIM pin; enables thermally compensated foldback or fixed-current limiting without sense resistors. |
| Monotonic Soft-Start/Soft-Shutdown | Voltage-controlled ramp limits inrush current; ensures monotonic rise into precharged outputs; prevents output overshoot during power-down. |
| No Compensation Required | Stable with polymer/tantalum output capacitors; ceramic caps supported with external RC compensation network. |
Applications
| GPU Core Supply | DDR Memory VDDQ/VTT |
|---|---|
|
Use Scenario: Powers GPU cores in AI accelerators and high-end graphics cards requiring rapid voltage scaling and sub-100ns transient response. IC Role / Device Role / Timing Role: Primary step-down regulator delivering 0.8V–1.2V at up to 15A with dynamic REFIN-based DVFS control. Use Value: Enables real-time GPU frequency/voltage tuning while maintaining ±20mV output stability during 1A→12A load steps. |
Use Scenario: Supplies DDR4/DDR5 VDDQ (1.2V/1.1V) and VTT termination (0.6V/0.55V) rails in servers and workstations. IC Role / Device Role / Timing Role: High-accuracy, low-noise buck converter with ±0.5% regulation and ultrasonic mode to avoid audible noise. Use Value: Meets JEDEC DDR voltage tolerance specs while eliminating capacitor whine via SKIP-mode ultrasonic operation (>20kHz). |
| Server Point-of-Load | Storage Power Supply |
|
Use Scenario: Delivers tightly regulated 1.05V/1.5V/3.3V rails to ASICs, FPGAs, and PCIe controllers in 1U/2U rack servers. IC Role / Device Role / Timing Role: Compact, high-power-density regulator with 6mm × 6mm footprint and integrated MOSFETs for minimal board area. Use Value: Achieves >90% peak efficiency at 12V input/1.5V@15A, reducing thermal load in space-constrained server mezzanine cards. |
Use Scenario: Powers NVMe SSDs and SAS/SATA backplanes requiring robust overvoltage/undervoltage protection and thermal resilience. IC Role / Device Role / Timing Role: Fault-protected buck controller with OVP/UVP (±300mV/±200mV), thermal shutdown (160°C), and soft-shutdown sequencing. Use Value: Prevents data corruption during power faults by asserting PGOOD only when output is within spec and blanking it during REFIN transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8772GQ-Z (Monolithic Power) | 12A rated, 4.5V–18V input, fixed 600kHz fSW, no dynamic REFIN, requires external compensation for ceramics. | Lacks dynamic voltage scaling and ultrasonic mode; suited for fixed-output, cost-sensitive PoL where REFIN control is unnecessary. | Select MP8772GQ-Z when board space allows larger inductors and output voltage is static; MAX15035ETL+T preferred for GPU DVFS or DDR VTT sequencing. |
| TPS546D24RQF (Texas Instruments) | 15A, 4.5V–18V input, PMBus interface, digital loop compensation, ±0.5% accuracy, but 5mm × 5mm QFN-32 package. | Supports telemetry and adaptive loop tuning via PMBus; lacks Quick-PWM™'s 100ns response but offers configurability via firmware. | Choose TPS546D24RQF for systems requiring remote monitoring, margining, or field-upgradable compensation; MAX15035ETL+T excels in analog simplicity and ultrafast transient immunity. |
Compared with MP8772GQ-Z and TPS546D24RQF, the MAX15035ETL+T uniquely combines 100ns transient response, dynamic REFIN-based voltage scaling, and ultrasonic mode in a single analog IC-making it optimal for GPU core supplies and DDR memory rails where analog speed and noise avoidance outweigh digital configurability needs.
Availability
MAX15035ETL+T is available at Aetrix Electronics and suitable for server computers, GPU core supplies, and DDR memory VDDQ/VTT applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX15035ETL+T 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 high-performance analog and mixed-signal ICs for demanding power, interface, and sensing applications in computing, industrial, and communications infrastructure.
The MAX15035ETL+T belongs to Maxim's high-current, high-efficiency step-down regulator product line, engineered specifically for low-duty-cycle, high-power-density point-of-load conversion in servers, GPUs, and memory subsystems.
FAQ
What is the maximum continuous output current rating for the MAX15035ETL+T?
The MAX15035ETL+T is rated for 15A continuous output current at TA = +70°C with proper PCB thermal design (four-layer board, 2oz copper). Its PGND RMS current rating is 20A, and IN RMS current rating is 15A-validated in the datasheet's Absolute Maximum Ratings table and confirmed by thermal derating curves (toc13/toc14).
Does the MAX15035ETL+T require external compensation for ceramic output capacitors?
Yes, the MAX15035ETL+T requires external RC compensation when using ceramic output capacitors due to their near-zero ESR. The datasheet explicitly states "Stable with Ceramic Output Capacitors Using External Compensation" in the Features section and provides design guidance in Figure 6 and Table 1.
How does the REFIN pin enable dynamic output voltage control in the MAX15035ETL+T?
The REFIN pin sets the feedback reference voltage (VFB = VREFIN) directly. Applying 0.5V–2.0V to REFIN configures the output from 0.5V to 2.0V (or up to 0.9×VIN). This enables real-time GPU DVFS or DDR VTT tracking, with slew rate limited to 3–18mV/µs to prevent fault triggering during transitions.
What protection features are integrated into the MAX15035ETL+T?
The MAX15035ETL+T integrates output overvoltage protection (OVP, +300mV trip), undervoltage protection (UVP, −200mV trip), thermal shutdown (160°C), valley current-limit protection with adjustable threshold, and voltage-controlled soft-start/soft-shutdown-all verified in the Electrical Characteristics tables (pages 2–5) and Typical Operating Characteristics (toc23–toc24).
What is the purpose of the TON pin on the MAX15035ETL+T, and how is it configured?
The TON pin sets the switching frequency via an external resistor (RTON) between TON and IN. Values of 97.5kΩ, 200kΩ, and 302.5kΩ configure 600kHz, 300kHz, and 200kHz respectively, using the formula tSW = CTON × (RTON + 6.5kΩ) × (VFB/VIN). This is detailed in the Pin Description (page 11) and Electrical Characteristics (page 2).
MAX15035ETL+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX15035ETL+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX15035ETL+T 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+T reliable?
The price and inventory of MAX15035ETL+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX15035ETL+T is usually 5 days.
3.What payment methods are accepted for MAX15035ETL+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX15035ETL+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX15035ETL+T?
MAX15035ETL+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX15035ETL+T 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+T?
For technical support, including MAX15035ETL+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX15035ETL+T requirements.
6.How does Aetrix verify that MAX15035ETL+T is sourced from the original manufacturer or authorized distributors?
All MAX15035ETL+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX15035ETL+T?
All MAX15035ETL+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX15035ETL+T, 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+T part is unused and in its original packaging.
Return procedure for MAX15035ETL+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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