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Analog Devices Inc./Maxim Integrated MAX20730EPL+
- Part No.:
- MAX20730EPL+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-VFQFN, FCQFN
- Datasheet:
-
MAX20730EPL+.pdf
- Description:
- IC REG BUCK ADJ 25A 15FCQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,398
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Product details
Overview
MAX20730EPL+ from Maxim Integrated is a fully integrated, PMBus-enabled step-down switching regulator designed for high-current point-of-load (PoL) applications in networking and telecom infrastructure. It delivers up to 25A output current from a 4.5V–16V input, supports 0.6V–5.5V programmable output voltage, achieves 90.8% peak efficiency at 12VIN/1VOUT, and features valley current-mode control with fast transient response (up to 300A/μs load-step). It is used in server VRMs, µP chipset power delivery, and memory VDDQ regulation.
For engineers reviewing the MAX20730EPL+ datasheet, MAX20730EPL+ pinout, MAX20730EPL+ application, or MAX20730EPL+ equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, real-world application constraints (e.g., remote sensing, BST capacitor requirement), and two rigorously cross-checked alternative parts for PoL DC-DC design evaluation.
Technical Context
The MAX20730EPL+ implements a valley current-mode PWM controller with fixed-frequency operation (400–900kHz) and dynamic frequency scaling during transients to minimize undershoot/overshoot. Its integrated high- and low-side MOSFETs, gate drivers, 1.85V LDO for VCC, and precision DAC-based reference (0.6016V–1.0V) enable single-chip regulation without external controllers.
It uses differential remote sensing (VSENSE+/VSENSE−) with open-circuit detection, supports PMBus v1.3 telemetry (voltage, current, temperature readback with ±3% accuracy), and includes hiccup-mode overcurrent protection, programmable thermal shutdown (130°C or 150°C), and input UVLO with 350mV hysteresis - all implemented in monolithic silicon with no external fault comparators required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports standard 5V, 12V, and intermediate bus architectures; requires VDDH > VOUT + 2V for guaranteed regulation. |
| Max Output Current | 25A continuous - rated at TA = 55°C, 200LFM airflow; derates to 15A at 85°C still-air per SOA curves. |
| Output Voltage Range | 0.6V to 5.5V - digitally programmable via PMBus or analog resistor divider; reference accuracy ±1.0% over −40°C to +125°C. |
| Peak Efficiency | 90.8% at 12VIN/1VOUT/25A - achieved with integrated FETs and optimized gate drive; full-load efficiency 84.8%. |
| Switching Frequency | 400kHz to 900kHz - set by C_SELB (400/600/800kHz) or overridden via PMBus; enables trade-off between size and efficiency. |
| Transient Response | Supports 300A/μs load steps - enabled by valley current-mode control and adaptive frequency scaling during transients. |
| PMBus Compliance | PMBus v1.3 - supports real-time telemetry (VDDH, VOUT, IOUT, die temp), configurable OVP/PWRGD thresholds, and Operate/Read/Write commands. |
Pinout & Package
MAX20730EPL+ is housed in a 15-pin, 5mm × 5mm, 0.5mm-pitch TQFN package (Package Code P154A6F+1, Outline 21-100020) with exposed thermal pad for enhanced heat dissipation (θJC = 0.62°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSENSE+ | Remote sense positive input | Kelvin connection to load VOUT; enables precise regulation despite PCB trace IR drop - open-circuit detection prevents false regulation. |
| VSENSE− | Remote sense negative input | Kelvin ground return at load; forms differential pair with VSENSE+ for high common-mode rejection (>60dB typical). |
| PGMA / PGMB | Analog programming inputs | Accept resistor-capacitor networks to configure switching frequency, soft-start time, and current-sense gain without PMBus. |
| VDDH | Main power input | Connects to high-side MOSFET drain; requires local 10µF ceramic bypass within 60 mils per layout guidelines. |
| VX | Switching node | Connects directly to buck inductor; rated −10V to +23V (25ns pulse); requires low-inductance routing to minimize EMI. |
| BST | Bootstrap supply | Must be connected to VX via 0.22µF X7R ceramic capacitor; supplies gate drive for high-side FET. |
| OE | Enable input | Logic-compatible enable with 0.9V threshold and 275kΩ internal pulldown; supports precise power sequencing across multiple rails. |
| STAT | Open-drain status output | Indicates regulation OK (high) or fault (low); pulled up to 1.8V/3.3V; asserts on OVP, OTP, UVLO, or BST fault. |
| CLK / DATA | PMBus interface | Standard SMBus-compliant bidirectional interface; supports 400kHz clock; requires 4.7kΩ pullups to VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Differential remote sensing | Enables ±0.7% load regulation over 0–25A by compensating for up to 50mV IR drop between regulator and load. |
| Valley current-mode control | Provides inherent cycle-by-cycle current limiting, stable operation with all-MLCC output capacitors, and <20µs integrator recovery. |
| Programmable thermal shutdown | OTP threshold configurable via PMBus to 130°C or 150°C - allows optimization for thermal margin vs. system uptime. |
| Hiccup overcurrent protection | Shuts down on sustained overcurrent, then auto-retries after cooldown - prevents thermal runaway during short-circuit events. |
| Integrated bootstrap circuit | Eliminates need for external charge pump; BST capacitor (0.22µF) is the only external component required for high-side gate drive. |
Applications
| Server CPU Core Power | Network Switch ASIC Supply |
|---|---|
|
Use Scenario: Delivering tightly regulated 0.8V–1.2V at up to 25A to high-performance x86 or ARM CPU cores in 1U rack servers. IC Role / Device Role / Timing Role: Primary point-of-load regulator with PMBus telemetry feeding server management controller (BMC) for real-time rail health monitoring. Use Value: Achieves 90.8% efficiency at 1V/25A, reducing system cooling load by >3W vs. discrete solutions; remote sensing maintains ±0.5% output accuracy at socket. |
Use Scenario: Powering multi-gigabit Ethernet switch ASICs requiring fast transient response to burst traffic loads. IC Role / Device Role / Timing Role: High-bandwidth PoL regulator with 300A/μs load-step capability and <20µs transient recovery - critical for maintaining SerDes link stability. Use Value: Adaptive frequency scaling minimizes VOUT undershoot to <±15mV during 15A→25A steps, preventing packet loss in Layer-2/Layer-3 forwarding paths. |
| Memory VDDQ Supply | µP Chipset VRM |
|
Use Scenario: Providing 1.2V/15A to DDR4/DDR5 memory modules with strict voltage tolerance (±3%) and low noise. IC Role / Device Role / Timing Role: Secondary PoL regulator with differential sensing and low-noise PWM control - suppresses switching noise coupling into memory data buses. Use Value: 0.62°C/W θJC and exposed thermal pad maintain junction temp <105°C under full load, ensuring 10-year reliability in 24/7 storage arrays. |
Use Scenario: Generating 1.05V/12A for PCIe root complex and southbridge logic in enterprise workstations. IC Role / Device Role / Timing Role: Sequenced enable rail with OE pin synchronized to main CPU VDD; STAT pin confirms regulation before PCIe enumeration begins. Use Value: Programmable soft-start (0.75–6ms) prevents inrush current from tripping upstream fuses; PMBus reporting enables firmware-level rail validation pre-boot. |
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 (Monolithic Power Systems) | 4.5V–16V input, 30A max, 400kHz–2.2MHz freq, no integrated PMBus - requires external MCU for telemetry. | Lacks native PMBus; suitable where telemetry is handled externally or not required; higher peak efficiency (93%) but larger solution size. | Select MP8770GQ-Z when cost sensitivity outweighs telemetry needs and board space permits external monitoring. |
| TPS546D24RQFPR (Texas Instruments) | 4.5V–18V input, 60A scalable (dual-phase), PMBus v1.3, 0.6V–3.3V output, 0.5% ref accuracy - higher current, tighter voltage tolerance. | Designed for dual-phase operation; requires external phase-interleaving components; better suited for >30A CPU core rails. | Select TPS546D24RQFPR when scaling beyond 25A or requiring sub-0.5% output tolerance for advanced process nodes. |
Compared with MP8770GQ-Z and TPS546D24RQFPR, the MAX20730EPL+ offers optimal balance of integration (single-chip 25A), PMBus telemetry, and compact 5mm × 5mm footprint - making it ideal for space-constrained, telemetry-aware PoL designs where 25A is the target current ceiling.
Availability
MAX20730EPL+ is available at Aetrix Electronics and suitable for networking equipment, telecom base stations, and enterprise server power delivery requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX20730EPL+ 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 infrastructure applications.
The MAX20730EPL+ belongs to Maxim's high-density PoL regulator product line, engineered specifically for next-generation datacom and telecom systems needing compact, efficient, and digitally controllable power conversion with minimal external components.
FAQ
What is the maximum continuous output current rating for the MAX20730EPL+ under standard conditions?
The MAX20730EPL+ is rated for 25A continuous output current at TA = 55°C with 200LFM airflow, as specified in the Thermal Rating table. At 85°C still-air, the safe operating area limits output to 15A. Derating must follow the SOA curves in the datasheet - actual current capability depends on PCB copper weight, thermal vias, and ambient conditions. The MAX20730EPL+ includes cycle-by-cycle overcurrent protection that triggers at programmable thresholds (e.g., 25A setting) to prevent damage.
Does the MAX20730EPL+ require an external bootstrap capacitor, and what are its specifications?
Yes, the MAX20730EPL+ requires a 0.22µF X7R or better ceramic capacitor connected between BST and VX pins. This capacitor supplies gate-drive voltage for the integrated high-side MOSFET. It must be placed with minimal trace length and inductance - typical layout guidelines specify ≤2mm distance and wide, direct routing. The BST node operates at up to +23V (25ns pulse), so capacitor voltage rating must exceed 25V. Failure to meet these requirements causes startup failure or erratic switching in the MAX20730EPL+.
How does remote sensing work on the MAX20730EPL+, and what happens if VSENSE− is left unconnected?
The MAX20730EPL+ uses differential remote sensing via VSENSE+ and VSENSE− pins to measure voltage directly at the load, compensating for PCB trace resistance. If VSENSE− is left unconnected or shorted to VDDH, the MAX20730EPL+ drives STAT low and halts regulation - this is a hard fault condition per the datasheet. The IC includes open-circuit detection on VSENSE− to prevent false regulation; proper Kelvin connection (separate sense traces back to load ground) is mandatory for ±0.7% load regulation performance.
Can the MAX20730EPL+ operate without PMBus communication, and what features remain functional?
Yes, the MAX20730EPL+ operates fully without PMBus - all core regulation functions (enable, soft-start, voltage setting, current limiting, thermal shutdown) are available via analog programming pins (PGMA/PGMB) and OE. PMBus is optional for telemetry (real-time V/I/T readback), fine-grained configuration (OVP threshold, OTP level), and system-level power management. The MAX20730EPL+ defaults to factory-programmed values (e.g., 1V output, 400kHz freq, 150°C OTP) when PMBus is unused.
What is the purpose of the SMALERT pin on the MAX20730EPL+, and how is it configured?
The SMALERT pin on the MAX20730EPL+ is an open-drain interrupt output that signals PMBus alert conditions - such as command fail, invalid address, or telemetry limit violation - to the system host. It is not used for fault reporting (STAT handles that). SMALERT requires a pullup resistor (typically 4.7kΩ to 3.3V) and is active-low. Configuration is done via PMBus ALERT_MASK command; default behavior is disabled. It enables centralized alert aggregation in multi-rail systems using the MAX20730EPL+.
MAX20730EPL+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 15-VFQFN, FCQFN
- Packaging:
- Tray
- 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:
- 25A
- 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 (6x4.15)
MAX20730EPL+ FAQ
1.How can I place an order for MAX20730EPL+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20730EPL+ 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 MAX20730EPL+ reliable?
The price and inventory of MAX20730EPL+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20730EPL+ is usually 5 days.
3.What payment methods are accepted for MAX20730EPL+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20730EPL+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20730EPL+?
MAX20730EPL+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20730EPL+ 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 MAX20730EPL+?
For technical support, including MAX20730EPL+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20730EPL+ requirements.
6.How does Aetrix verify that MAX20730EPL+ is sourced from the original manufacturer or authorized distributors?
All MAX20730EPL+ 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 MAX20730EPL+ meets industry standards.
7.What is the process for return or replacement of MAX20730EPL+?
All MAX20730EPL+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20730EPL+, 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 MAX20730EPL+ part is unused and in its original packaging.
Return procedure for MAX20730EPL+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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