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Analog Devices Inc./Maxim Integrated MAX20796AGFB+
- Part No.:
- MAX20796AGFB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 35-PowerVQFN
- Datasheet:
-
MAX20796AGFB+.pdf
- Description:
- INTEGRATED 2=PHASE, SINGLE SUPPL
- Quantity:
- Payment:
- Shipping:
Inventory:292
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Product details
Overview
The MAX20796AGFB+ from Analog Devices is a dual-phase, PMBus-compliant integrated buck voltage regulator delivering up to 60A from a 4.5V–16V input, with configurable 0.5V–5.5V output, fixed-frequency peak-current-mode control, and integrated linear regulators for single-supply operation-designed for point-of-load regulation in high-density server and telecom power systems.
For engineers reviewing the MAX20796AGFB+ datasheet, MAX20796AGFB+ pinout, MAX20796AGFB+ application, or MAX20796AGFB+ equivalent, key selection considerations include its 35-pin FC2QFN package, two-phase interleaved architecture with optional third-phase scalability, ±0.8% DC output accuracy, 200–799kHz programmable switching frequency, and real-time telemetry via PMBus 1.3 interface.
Technical Context
The MAX20796AGFB+ implements a multiphase peak-current-mode control architecture with differential remote sensing (SNSP/SNSN), lossless current monitoring per phase, and integrated PI voltage/current loop compensation. It supports both coupled and discrete inductor topologies with 180° phase shift in native dual-phase mode.
Startup includes monotonic prebias handling up to VOUT_COMMAND, initialization-driven configuration read from PGMx/R_ADDR pins, and synchronized enable via EN or PMBus OPERATION command. Fault protection integrates fast average/peak overcurrent detection (±10% accuracy), OVP/UVP with deglitching, and thermal shutdown at +125°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports common server/telecom rails including 5V, 12V, and 15V inputs without external level shifting. |
| Output Current Capacity | 60A continuous (dual-phase) - sufficient for high-power microprocessor VDDQ or ASIC core rails; scalable to 90A with external MAX20766 power stage. |
| Output Voltage Range | 0.5V to 5.5V - covers DDR memory, FPGA I/O, and auxiliary supply requirements with direct feedback configuration. |
| Switching Frequency | 200kHz to 799kHz - programmable via pin-strap or PMBus to optimize efficiency vs. size trade-offs in high-density layouts. |
| DC Output Accuracy | ±0.8% - measured between SNSP and SNSN pins, enabling tight regulation for sensitive digital loads without external calibration. |
| PMBus Compliance | Revision 1.3 - supports full telemetry (READ_VIN/VOUT/IOUT/TEMP), configurable protection thresholds, and nonvolatile command storage (5 writes). |
| Junction Temperature Range | −40°C to +125°C - qualified for industrial and extended-temperature networking equipment with validated thermal performance at 0LFM airflow. |
Pinout & Package
The MAX20796AGFB+ is housed in a 35-pin, 4mm × 10.5mm, 0.5mm pitch FC2QFN package with exposed thermal pad, optimized for low-inductance layout and high thermal conductivity in space-constrained server VRMs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDH1 / VDDH2 | High-side MOSFET input supply | Dual independent 4.5V–16V power inputs feeding each phase's high-side switch; requires local high-frequency bypass capacitors within 60mil. |
| LX1 / LX2 | Switching node | Direct connection points to output inductors; rated for −10V to +23V AC swing and ±72A peak current per phase. |
| BST1 / BST2 | Bootstrap supply | Drives high-side gate drivers; requires 0.22μF ceramic capacitor to LX; UVLO threshold at 1.46V–1.64V ensures reliable bootstrap charging. |
| SNSP / SNSN | Differential output voltage sense | Enables remote sensing with ±15μA bias current; supports accurate regulation independent of PCB trace IR drop. |
| PGOOD | Power-good indicator | Open-drain output asserting when VOUT is within ±0.8% setpoint and regulation is stable; includes 10mV hysteresis to prevent chatter. |
| EN | Active-high enable | Logic-controlled startup with 20μs turn-on delay after VEN_IH (0.9V) is met; supports system-level sequencing with other power rails. |
| RESTORE | Output voltage reset | Falling-edge triggered; restores VOUT to PGMA-strapped value with 10μs deglitch to reject noise-induced resets. |
| PWM / CS / TS_FAULT | External power-stage interface | Provides PWM drive, current-sense input, and thermal/fault signaling for seamless integration with MAX20766 or similar third-phase controllers. |
Key Features
| Feature | Design Value |
|---|---|
| Peak efficiency 92% | Achieved at VIN = 12V, VOUT = 1V, 60A load - reduces heat generation and improves system power density in thermally constrained chassis. |
| Integrated loop compensation | Eliminates need for external compensation components - simplifies design, accelerates time-to-market, and ensures stability across operating conditions. |
| Coupled inductor support | Reduces output ripple and required output capacitance - enables smaller, lower-cost solutions while maintaining transient response performance. |
| Monotonic prebias startup | Supports two-phase startup with output prebias up to VOUT_COMMAND - prevents reverse current flow during hot-swap or partial-power-up scenarios. |
| Nonvolatile PMBus command storage | Stores five user-defined configurations (e.g., OCP threshold, soft-start time) - retains settings across power cycles without host intervention. |
Applications
| Server CPU Core Supply | DDR5 Memory VDDQ Rail |
|---|---|
Use Scenario: Regulating 0.8V–1.1V core voltage for dual-socket Xeon Scalable processors under dynamic 0–60A load transients. IC Role / Device Role / Timing Role: Dual-phase buck controller providing fast transient response, precise voltage tracking, and PMBus telemetry for dynamic voltage/frequency scaling (DVFS). Use Value: ±0.8% DC accuracy and 200–799kHz frequency tuning ensure compliance with Intel VR14/VR15 specifications while minimizing output capacitor count. | Use Scenario: Delivering tightly regulated 1.25V VDDQ to DDR5 DIMMs in high-bandwidth storage servers with strict ±15mV tolerance. IC Role / Device Role / Timing Role: Point-of-load regulator using differential remote sensing (SNSP/SNSN) to compensate for PCB voltage drop across long memory channels. Use Value: Integrated current sensing and monotonic startup prevent data corruption during warm reboot or memory hot-plug events. |
| Telecom Baseband Unit Power | AI Accelerator Auxiliary Rail |
Use Scenario: Generating 3.3V/5.0V auxiliary supplies for FPGAs and ADC/DAC signal chains in 5G massive MIMO base stations. IC Role / Device Role / Timing Role: High-efficiency, low-noise buck regulator with PMBus telemetry for real-time thermal and load monitoring in fanless outdoor enclosures. Use Value: 92% peak efficiency and −40°C to +125°C operation reduce cooling requirements and extend field reliability in uncontrolled environments. | Use Scenario: Providing 0.75V–0.9V bias to GPU or TPU auxiliary logic blocks requiring rapid load-step response and fault logging. IC Role / Device Role / Timing Role: Scalable dual-phase controller supporting optional third-phase extension via MAX20766 for future-proof power delivery headroom. Use Value: RESTORE pin enables on-the-fly voltage reconfiguration during AI model switching, reducing firmware complexity and latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase PMBus-regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20796A | Factory preconfigured for 1V/800kHz with LEAD_LAG enabled; lacks R_ADDR/PGMx flexibility; identical FC2QFN package and pinout. | Targeted for fixed 1V server core applications only; no runtime reconfiguration of output voltage or frequency. | Select MAX20796A only if design requires guaranteed 1V/800kHz operation without hardware or firmware customization. |
| MP2960A | Monolithic dual-phase controller with PMBus 1.2, 40A max, 0.3V–5.5V output, but no integrated linear regulators - requires external 3.3V/1.8V bias supplies. | Lower current capacity and reduced feature set (no RESTORE, no prebias startup, no nonvolatile storage); suited for cost-sensitive mid-range systems. | Choose MP2960A where board space allows separate bias rails and 40A output suffices, accepting trade-offs in telemetry depth and startup robustness. |
Compared with MAX20796A, the MAX20796AGFB+ offers full hardware configurability and broader voltage/frequency range; versus MP2960A, it delivers higher current, integrated bias generation, and enhanced fault diagnostics - making it optimal for high-reliability, high-density infrastructure power designs.
Availability
The MAX20796AGFB+ is available at Aetrix Electronics and suitable for server CPU core supplies, DDR5 memory VDDQ rails, and telecom baseband unit power requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX20796AGFB+ 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, communications, and industrial markets since 1965.
The MAX20796AGFB+ belongs to Analog Devices' high-current, digitally controlled power regulator product line, engineered specifically for next-generation data center and 5G infrastructure demanding compact, efficient, and telemetry-rich voltage regulation.
FAQ
What is the maximum continuous output current supported by the MAX20796AGFB+ in dual-phase configuration?
The MAX20796AGFB+ delivers up to 60A continuous output current in native dual-phase operation, validated under thermal test conditions at TA = +55°C with 200LFM airflow. This rating assumes proper PCB layout with adequate copper area and thermal vias beneath the FC2QFN package's exposed pad. At +85°C ambient with no forced airflow, the derated capacity is 42A at 12V input and 0.8V output.
Does the MAX20796AGFB+ require external linear regulators for bias supply?
No, the MAX20796AGFB+ integrates internal linear regulators that generate AVDD (1.8V), VCC1/VCC2 (1.8V), and DVDD (1.8V) from either VLDOIN or VDDH, enabling true single-supply operation. An external 3.3V supply to VLDOIN is optional and recommended to improve thermal performance, but not mandatory - the device can self-bias from VDDH alone using its internal LDOs.
How does the RESTORE pin function on the MAX20796AGFB+ and what is its timing behavior?
The RESTORE pin on the MAX20796AGFB+ initiates a falling-edge-triggered reset of the output voltage to the value set by the PGMA resistor strap. It incorporates a 10μs deglitch filter to suppress noise-induced false triggers. Once asserted, the output ramps monotonically to the restored voltage at the same slew rate defined by the current soft-start time (TON_RISE), preserving safe startup behavior without reverse current.
Can the MAX20796AGFB+ operate with discrete inductors, or is coupled inductor topology mandatory?
The MAX20796AGFB+ fully supports both discrete and coupled inductor topologies. Coupled inductors reduce output ripple and minimize required output capacitance, improving power density; discrete inductors offer greater layout flexibility and simplified magnetics sourcing. The control architecture automatically adapts - no hardware or firmware changes are needed when switching between topologies.
What PMBus commands are supported for real-time telemetry and configuration of the MAX20796AGFB+?
The MAX20796AGFB+ supports full PMBus 1.3 telemetry including READ_VIN, READ_VOUT, READ_IOUT, and READ_TEMPERATURE1 with 10-bit resolution and typical errors of ±1% for voltage, ±3.6A for current, and ±4°C for temperature. Configuration commands include VOUT_COMMAND, ON_OFF_CONFIG, OPERATION, STORE_DEFAULT_ALL, and WRITE_PROTECT - with five nonvolatile writes available for persistent settings storage.
MAX20796AGFB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 35-PowerVQFN
- Packaging:
- Tray
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (2), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 200kHz ~ 800kHz
- Voltage/Current - Output 1:
- 0.5 V ~ 5.5 V, 60A
- Voltage/Current - Output 2:
- 0.5V ~ 5.5V, 60A
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 4.5V ~ 16V
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 35-FC2QFN (4x10.5)
MAX20796AGFB+ FAQ
1.How can I place an order for MAX20796AGFB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20796AGFB+ 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 MAX20796AGFB+ reliable?
The price and inventory of MAX20796AGFB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20796AGFB+ is usually 5 days.
3.What payment methods are accepted for MAX20796AGFB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20796AGFB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20796AGFB+?
MAX20796AGFB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20796AGFB+ 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 MAX20796AGFB+?
For technical support, including MAX20796AGFB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20796AGFB+ requirements.
6.How does Aetrix verify that MAX20796AGFB+ is sourced from the original manufacturer or authorized distributors?
All MAX20796AGFB+ 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 MAX20796AGFB+ meets industry standards.
7.What is the process for return or replacement of MAX20796AGFB+?
All MAX20796AGFB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20796AGFB+, 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 MAX20796AGFB+ part is unused and in its original packaging.
Return procedure for MAX20796AGFB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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