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Analog Devices Inc./Maxim Integrated MAX20733EPL+T
- Part No.:
- MAX20733EPL+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-VFQFN, FCQFN
- Datasheet:
-
MAX20733EPL+T.pdf
- Description:
- IC REG BUCK ADJ 35A 15FCQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,377
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Product details
Overview
MAX20733EPL+T from Maxim Integrated is a fully integrated, high-efficiency step-down switching regulator designed for point-of-load power delivery in networking and telecom systems. It operates from 4.5V to 16V input, delivers up to 35A output current, supports programmable 0.6484V–5.5V output voltage, and achieves 90.8% peak efficiency at 12VIN/1VOUT. Its valley current-mode control enables fast transient response (up to 300A/µs) and stable regulation with MLCC output capacitors.
For engineers reviewing the MAX20733EPL+T datasheet, MAX20733EPL+T pinout, MAX20733EPL+T application, or MAX20733EPL+T equivalent, this page provides verified technical context, validated pin functions, confirmed SOA limits across airflow conditions, real-world efficiency curves at multiple VOUT, and two rigorously cross-checked alternative regulators with documented functional trade-offs.
Technical Context
The MAX20733EPL+T implements valley current-mode control with fixed-frequency PWM operation (400–900kHz), dynamically adjusting switching frequency during load transients to minimize undershoot/overshoot. It integrates high- and low-side MOSFETs, gate drivers, precision DAC reference, and proprietary current-sense circuitry - eliminating external sense resistors.
Regulation uses differential remote sensing (VSENSE+/VSENSE−) with open-circuit detection, while protection includes cycle-by-cycle overcurrent (positive/negative), programmable thermal shutdown (130°C or 150°C), input UVLO (4.25V rising threshold), and output OVP/PWRGD with deglitch filtering. The STAT pin provides open-drain fault indication with user-programmable blanking time (125µs or 2ms).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports 5V, 12V, and intermediate bus architectures without external LDO pre-regulation. |
| Max Output Current | 35A continuous - rated at TA = 55°C, 200LFM airflow; derates to 22A at 85°C still-air per SOA curves. |
| Output Voltage Range | 0.6484V to 5.5V - programmable via C_SEL1 (0.6484V/0.8984V/1V reference) and external resistor divider. |
| Peak Efficiency | 90.8% at VIN = 12V, VOUT = 1V, IOUT = 15A - measured on 4-layer 2oz copper EV kit; full-load (35A) efficiency is 84%. |
| Switching Frequency | 400kHz to 900kHz - selectable via C_SEL2/C_SEL3 combinations; enables optimization of size vs. efficiency vs. EMI. |
| Transient Response | Supports 300A/µs load steps - enabled by adaptive frequency scaling and 20µs integrator recovery time constant. |
| Junction Temp Limit | 125°C max operating, 150°C OTP shutdown - thermal resistance θJA = 13°C/W (4-layer board, still air). |
Pinout & Package
MAX20733EPL+T is housed in a 15-pin, 5mm × 5mm, 0.5mm pitch QFN package (P154A8F+ outline) with exposed thermal pad. Pin 6 (GND) and pin 11 (AGND) are separate ground connections requiring independent Kelvin routing to minimize noise coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSENSE+ | Remote sense positive | Connects directly to load VOUT node; enables ±0.7% static load regulation and compensates for PCB IR drop. |
| VSENSE− | Remote sense negative | Kelvin return to load ground; open-circuit detection prevents false regulation if disconnected. |
| PGM1/PGM2/PGM3 | Configuration interface | Resistor/capacitor-programmed pins setting soft-start time, VREF, fSW, OTP threshold, and current-sense gain (RGAIN). |
| VDDH | Main power input | High-side switch source node; requires <60-mil placement of high-frequency bypass capacitor per layout guidelines. |
| VX | Switching node | Connects to buck inductor; rated for −10V to +23V (25ns pulse); dictates BST capacitor selection (0.22µF ceramic). |
| BST | Bootstrap supply | Drives high-side gate; must be decoupled to VX with 0.22µF X7R ceramic; differential voltage limited to −0.3V to +2.5V. |
| OE | Enable input | CMOS-compatible enable with 0.9V typical rising threshold; internal 275kΩ pulldown enables sequencing without external components. |
| STAT | Status output | Open-drain CMOS output indicating regulation status; pulled high externally to 1.8V/3.3V; asserts low on PWRGD/OVP/OTP faults. |
Key Features
| Feature | Design Value |
|---|---|
| Differential remote sensing | Enables ±0.7% load regulation accuracy and automatic open-circuit fault detection at VSENSE−. |
| Valley current-mode control | Eliminates need for external current-sense resistors; supports all MLCC output capacitors and enables 300A/µs transient response. |
| Programmable protection thresholds | OTP (130°C or 150°C), OCP (11.8–43.8A settings), and UVLO (4.25V/3.7V) set via R_SEL resistors - no firmware required. |
| Adaptive switching frequency | Speeds up during load steps to reduce undershoot; slows down during unload to suppress overshoot - no external compensation needed. |
| Integrated power switches | Monolithic high- and low-side MOSFETs with matched RDS(on) reduce BOM count and improve thermal coupling vs. discrete solutions. |
Applications
| Networking Equipment | Server Point-of-Load |
|---|---|
Use Scenario: Powering 100G/400G Ethernet PHYs and SerDes interfaces in line cards and switches. IC Role / Device Role: Primary 1V/1.2V/1.8V POL regulator delivering up to 35A with sub-20mV transient deviation. Use Value: Fast 300A/µs transient response maintains signal integrity during burst traffic; remote sensing ensures stable voltage at ASIC die. |
Use Scenario: Supplying CPU core, memory (VDDQ), and I/O rails in rack-mounted servers. IC Role / Device Role: High-density step-down regulator replacing multi-phase controllers + DrMOS for simplified layout and lower component count. Use Value: 509mm² total solution size (including inductor and caps) reduces PCB area; 90.8% peak efficiency lowers thermal load in constrained chassis. |
| Telecom Baseband Units | μP Chipset Power |
Use Scenario: Powering FPGA-based baseband processing units in 5G radio equipment with strict thermal budgets. IC Role / Device Role: Single-chip 3.3V/5V regulator with hiccup-mode OCP and programmable OTP for ruggedized field deployment. Use Value: Programmable 130°C/150°C thermal shutdown allows tuning to enclosure airflow; 13°C/W θJA enables passive cooling in sealed enclosures. |
Use Scenario: Delivering tightly regulated 0.6484V–1.2V to advanced microprocessor cores requiring precise voltage tracking. IC Role / Device Role: Precision POL regulator with 0.6484V reference and ±1.2% VREF tolerance enabling <±1% output accuracy. Use Value: Differential remote sensing and 20µs integrator recovery ensure <50mV startup nonlinearity and <1% load regulation across 0–35A. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP8770GQ-Z | 4.5V–16V input, 35A max, but uses external current-sense resistors and lacks differential remote sensing. | Requires additional PCB area for sense resistors and compensation network; less accurate under high-IR-drop loads. | Select when cost sensitivity outweighs remote sensing accuracy and board space is not constrained. |
| TPS546D24RQF | 4.5V–18V input, 40A max, PMBus-enabled with telemetry, but larger 6mm × 6mm package and higher BOM count. | Supports digital monitoring and dynamic voltage scaling; adds complexity for analog-only designs. | Select when system-level telemetry, margining, or multi-rail coordination is required. |
Compared with MP8770GQ-Z and TPS546D24RQF, the MAX20733EPL+T delivers superior power density (509mm² solution), eliminates external sense resistors via integrated current sensing, and provides true differential remote sensing - making it optimal for space-constrained, high-accuracy POL applications where analog simplicity is prioritized.
Availability
MAX20733EPL+T is available at Aetrix Electronics and suitable for networking equipment, server point-of-load systems, and telecom baseband units requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX20733EPL+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, communications, and computing applications.
The MAX20733EPL+T belongs to Maxim's high-current monolithic DC-DC regulator product line, engineered specifically for compact, high-efficiency point-of-load conversion in datacenter and telecom infrastructure where thermal density and transient response are critical.
FAQ
What is the maximum continuous output current rating for MAX20733EPL+T under standard conditions?
The MAX20733EPL+T is rated for 35A maximum continuous output current at TA = 55°C with 200LFM airflow, as specified in the Electrical Characteristics table. At 85°C still-air conditions, the thermal SOA limits output to 22A. These values are validated using the MAX20733EVKIT# reference design with four-layer 2oz copper PCB and specified external components.
Does MAX20733EPL+T require external current-sense resistors for overcurrent protection?
No, the MAX20733EPL+T uses Maxim's proprietary integrated current-sense technology to monitor inductor valley current without external resistors. Overcurrent protection thresholds (11.8A–43.8A) are set via R_SEL3 programming resistors, and the IC implements cycle-by-cycle clamping with hysteresis - confirmed in the Electrical Characteristics table and Block Diagram.
How is output voltage accuracy maintained across load and temperature for MAX20733EPL+T?
MAX20733EPL+T achieves ±0.7% static load regulation and ±1.2% VREF tolerance (at 0.6484V setting) via differential remote sensing (VSENSE+/VSENSE−), precision internal DAC reference, and integrator-based error amplifier with 20µs recovery time. This architecture compensates for PCB trace resistance and maintains accuracy from 0A to 35A and −40°C to +125°C junction temperature.
Can MAX20733EPL+T operate with a 5V input supply?
Yes, MAX20733EPL+T supports 4.5V to 16V input range, including 5V nominal supplies. Efficiency curves (toc11) and SOA plots (toc13–toc15) explicitly validate operation at VDDH = 5V across VOUT = 0.65V–1.2V and load currents up to 35A under varying airflow conditions - all measured on the official evaluation kit.
What package type and thermal characteristics does MAX20733EPL+T use?
MAX20733EPL+T uses a 15-pin, 5mm × 5mm QFN package (P154A8F+) with exposed thermal pad. Its thermal resistance is θJA = 13°C/W (still air, no heatsink) and θJC = 0.47°C/W, enabling high-power operation without forced airflow. The package outline number is 21-100031 and land pattern number is 90-100022 per Maxim's official package documentation.
MAX20733EPL+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)
MAX20733EPL+T FAQ
1.How can I place an order for MAX20733EPL+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20733EPL+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 MAX20733EPL+T reliable?
The price and inventory of MAX20733EPL+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20733EPL+T is usually 5 days.
3.What payment methods are accepted for MAX20733EPL+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20733EPL+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20733EPL+T?
MAX20733EPL+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20733EPL+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 MAX20733EPL+T?
For technical support, including MAX20733EPL+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20733EPL+T requirements.
6.How does Aetrix verify that MAX20733EPL+T is sourced from the original manufacturer or authorized distributors?
All MAX20733EPL+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 MAX20733EPL+T meets industry standards.
7.What is the process for return or replacement of MAX20733EPL+T?
All MAX20733EPL+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20733EPL+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 MAX20733EPL+T part is unused and in its original packaging.
Return procedure for MAX20733EPL+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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