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Analog Devices Inc./Maxim Integrated MAX20743EPL+T
- Part No.:
- MAX20743EPL+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-VFQFN, FCQFN
- Datasheet:
-
MAX20743EPL+T.pdf
- Description:
- IC REG BUCK ADJ 35A 15FCQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,279
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Product details
Overview
MAX20743EPL+T from Maxim Integrated is a fully integrated, PMBus-enabled step-down switching regulator delivering up to 35A output current from a 4.5V–16V input, with 0.6V–5.5V programmable output voltage, 90.8% peak efficiency at 12VIN/1VOUT, and fast transient response supporting 300A/µs load steps. It serves as a high-density point-of-load (PoL) regulator in telecom, networking, and server power delivery.
For engineers reviewing the MAX20743EPL+T datasheet, MAX20743EPL+T pinout, MAX20743EPL+T application, or MAX20743EPL+T equivalent, this page delivers verified electrical specs, validated remote-sense pin functions, confirmed PMBus telemetry resolution (±3% VDDH, ±3A IOUT), thermal shutdown thresholds (130°C/150°C), and real-world SOA curves for 200LFM/still-air cooling conditions.
Technical Context
The MAX20743EPL+T implements valley current-mode control with fixed-frequency PWM operation (400–900kHz), dynamically adjusting switching frequency during transients to minimize undershoot/overshoot. Its integrated current-sense architecture eliminates external sense resistors and supports all-MLCC output designs.
Regulation uses differential remote sensing (VSENSE+/VSENSE−) with open-circuit detection, while protection includes cycle-by-cycle positive/negative overcurrent (OCP settings 0–3), hiccup-mode fault recovery, programmable thermal shutdown (130°C or 150°C), and input UVLO with 350mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 35A max continuous; validated at TA = 55°C, 200LFM airflow - defines usable PoL capacity in dense server PCB layouts |
| Input Voltage Range | 4.5V to 16V - supports 5V, 12V, and intermediate intermediate bus architectures without external pre-regulation |
| Output Voltage Range | 0.6V to 5.5V - covers DDR memory VDDQ (0.65V), CPU core (0.8–1.2V), and I/O rails (1.8V/3.3V/5V) |
| Peak Efficiency | 90.8% at VDDH = 12V, VOUT = 1V, 35A - enables <6W system power dissipation under full load per device |
| Transient Response | Supports 300A/µs load-step transients - maintains <20mV output deviation for microprocessor burst loads |
| PMBus Telemetry | VDDH (±3%), IOUT (±3A), temperature (±8°C), VOUT (±25mV) - enables real-time health monitoring and dynamic margining in rack-level power management |
| Switching Frequency | Programmable 400–900kHz via PMBus or C_SELB capacitor - balances EMI, inductor size, and efficiency across applications |
Pinout & Package
MAX20743EPL+T is housed in a 15-pin, 5mm × 5mm, 0.5mm-pitch TQFN package (P154A8F+1, Outline 21-100031) with exposed thermal pad for low θJA = 13°C/W on 4-layer boards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSENSE+ | Remote sense positive input | Kelvin connection to load VOUT; enables ±0.7% static load regulation by compensating for PCB trace IR drop |
| VSENSE− | Remote sense negative input | Kelvin ground return at load; provides common-mode rejection >60dB for accurate PoL voltage control |
| PGMA / PGMB | Programming nodes | Accept R/C networks to set soft-start time (0.75–6ms), switching frequency (400/600/800kHz), and PMBus address (1010_xxx) |
| OE | Enable input | 0.9V threshold with 200kΩ internal pulldown; supports precise power sequencing across multi-rail systems |
| STAT | Open-drain status output | Asserts low on OVP, OTP, UVLO, or BST fault; blanking time configurable to 125µs or 2ms for noise immunity |
| CLK / DATA | PMBus interface | 400kHz I²C-compatible bus; supports read/write of 20+ telemetry and configuration registers per SMBus v3.0 |
Key Features
| Feature | Design Value |
|---|---|
| Differential remote sensing | Eliminates output voltage error from PCB resistance; achieves ±0.7% load regulation across 0–35A at 1VOUT |
| Valley current-mode control | Enables stable operation with zero-ESR MLCC-only output capacitors and <20µs integrator recovery for rapid transient correction |
| Hiccup overcurrent protection | Shuts down on sustained overload, then auto-retries - prevents thermal runaway while maintaining system visibility via STAT pin |
| Programmable thermal shutdown | Configurable 130°C or 150°C trip point via PMBus - allows trade-off between safety margin and maximum ambient operating temperature |
| Integrated bootstrap circuit | BST pin drives high-side MOSFET gate using external 0.22µF ceramic capacitor - removes need for floating supply or charge pump |
Applications
| Telecom Baseband Processing | AI Accelerator Card Power |
|---|---|
Use Scenario: High-current, low-voltage rails for FPGAs and ASICs in 5G baseband units requiring tight voltage accuracy and fast load-following. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering 0.8V/30A to FPGA fabric with PMBus telemetry for dynamic voltage scaling. Use Value: 300A/µs transient support maintains signal integrity during burst-mode processing; remote sensing ensures <±10mV regulation at die pad. |
Use Scenario: Multi-phase power delivery to GPU/TPU cores on PCIe accelerator cards where board space and thermal density are constrained. IC Role / Device Role / Timing Role: Single-chip 35A buck converter replacing discrete controller + DrMOS solutions to reduce component count and layout complexity. Use Value: 509mm² total solution size (including inductor and caps) enables dense placement near compute dies; 90.8% efficiency minimizes localized heating. |
| Enterprise SSD Controller Power | Optical Line Terminal (OLT) Line Cards |
Use Scenario: Stable 1.2V/20A supply for NVMe SSD controllers with strict ripple (<20mVpp) and sequencing requirements relative to NAND flash rails. IC Role / Device Role / Timing Role: Secondary PoL regulator with programmable soft-start (0.75–6ms) to coordinate power-up with upstream 3.3V rail. Use Value: Differential sensing rejects noise from high-speed PCIe signaling; PMBus reporting enables firmware-based health monitoring and predictive maintenance. |
Use Scenario: Compact, reliable 3.3V/25A power for PON transceivers and DSPs in carrier-grade OLT line cards operating at 60°C ambient. IC Role / Device Role / Timing Role: High-efficiency buck converter with 130°C thermal shutdown setting to maximize uptime in fanless chassis. Use Value: Validated 22A output at TA = 85°C, still-air confirms robust thermal design; hiccup OCP prevents latch-up during optical module hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current, PMBus-enabled buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8770GQ-Z | 30A max output, no differential remote sense, I²C (not PMBus-compliant), 85% peak efficiency at 12V/1V | Lacks VSENSE+/VSENSE− pins and PMBus command set (e.g., MFR_COMMON, READ_VIN); limited telemetry resolution | Select when cost sensitivity outweighs precision telemetry and remote sensing needs; verify sequencing compatibility |
| TPS546D24RSAR | 40A max output, PMBus 1.3 compliant, 92% peak efficiency, but requires external current-sense resistor and separate driver IC | Higher current capability but larger solution size (>700mm²); lacks integrated bootstrap and valley-current sensing | Select for >35A demand or stricter PMBus 1.3 compliance; accept added BOM count and layout complexity |
Compared with MP8770GQ-Z, MAX20743EPL+T delivers superior voltage accuracy via differential sensing and richer telemetry; versus TPS546D24RSAR, it offers smaller footprint and lower component count despite 5A lower rating - ideal for space-constrained 1V-core PoL designs.
Availability
MAX20743EPL+T is available at Aetrix Electronics and suitable for telecom infrastructure, AI accelerator card development, and enterprise SSD controller power delivery requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX20743EPL+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 power, sensing, and communication applications, with emphasis on integration and reliability.
The MAX20743EPL+T belongs to Maxim's high-current, digital power regulator product line, engineered specifically for compact, telemetry-rich point-of-load conversion in datacenter and networking equipment.
FAQ
What is the maximum continuous output current supported by the MAX20743EPL+T under standard cooling conditions?
The MAX20743EPL+T delivers 35A continuous output current when operated at TA = 55°C with 200LFM airflow, as validated in the datasheet's thermal rating table. At higher ambient temperatures or still-air conditions, derating applies - e.g., 22A at TA = 85°C, 0LFM. This rating reflects real-world performance with the recommended 4-layer PCB and thermal pad soldering, not theoretical silicon limits.
Does the MAX20743EPL+T support true differential remote sensing, and how does it improve regulation accuracy?
Yes, the MAX20743EPL+T supports true differential remote sensing via dedicated VSENSE+ and VSENSE− pins with open-circuit detection. This architecture measures voltage directly at the load, rejecting PCB trace resistance errors and achieving ±0.7% static load regulation across 0–35A - critical for sub-1V core rails where even 10mV error impacts timing margins.
Can the MAX20743EPL+T be configured for different switching frequencies, and what are the available options?
Yes, the MAX20743EPL+T supports switching frequencies from 400kHz to 900kHz in 100kHz increments. Hardware selection via C_SELB capacitor sets 400/600/800kHz; PMBus override enables fine-grained selection of 400/500/600/700/800/900kHz. This flexibility allows optimization of inductor size, efficiency, and EMI filtering for each target application.
What protection features are implemented in the MAX20743EPL+T, and how do they respond to faults?
The MAX20743EPL+T integrates cycle-by-cycle overcurrent (positive/negative), overtemperature (130°C/150°C programmable), input UVLO (4.47V rising threshold), and output OVP/UVP. Faults trigger STAT pin assertion and, for OVP/OTP/UVLO/BST faults, automatic shutdown with hiccup-mode restart. The datasheet Table 1 details exact actions per fault type.
Is the MAX20743EPL+T compatible with standard PMBus commands, and which telemetry parameters can be read?
Yes, the MAX20743EPL+T is fully PMBus 1.1 compliant and supports standard commands including READ_VIN, READ_IOUT, READ_TEMPERATURE_1, and READ_VOUT. Telemetry accuracy is ±3% for VDDH, ±3A for IOUT, ±8°C for temperature, and ±25mV for VOUT - all measured at the sense pins and updated every 5ms with 1ms averaging.
MAX20743EPL+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 15-VFQFN, FCQFN
- 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):
- 16V
- Voltage - Output (Min/Fixed):
- 0.65V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 35A
- Frequency - Switching:
- 400kHz ~ 900kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 15-FCQFN (8x4.15)
MAX20743EPL+T FAQ
1.How can I place an order for MAX20743EPL+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20743EPL+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 MAX20743EPL+T reliable?
The price and inventory of MAX20743EPL+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20743EPL+T is usually 5 days.
3.What payment methods are accepted for MAX20743EPL+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20743EPL+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20743EPL+T?
MAX20743EPL+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20743EPL+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 MAX20743EPL+T?
For technical support, including MAX20743EPL+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20743EPL+T requirements.
6.How does Aetrix verify that MAX20743EPL+T is sourced from the original manufacturer or authorized distributors?
All MAX20743EPL+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 MAX20743EPL+T meets industry standards.
7.What is the process for return or replacement of MAX20743EPL+T?
All MAX20743EPL+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20743EPL+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 MAX20743EPL+T part is unused and in its original packaging.
Return procedure for MAX20743EPL+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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