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Analog Devices Inc./Maxim Integrated MAX20796GFB+T
- Part No.:
- MAX20796GFB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 35-PowerVQFN
- Datasheet:
-
MAX20796GFB+T.pdf
- Description:
- INTEGRATED 2-PHASE, SINGLE SUPPL
- Quantity:
- Payment:
- Shipping:
Inventory:2,028
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Product details
Overview
The MAX20796GFB+T from Analog Devices is a dual-phase, PMBus-compliant integrated buck voltage regulator delivering up to 60A from 4.5V–16V input, with 0.5V–5.5V programmable output, fixed-frequency peak-current-mode control, and integrated linear regulators for single-rail operation - deployed in server VRMs, telecom point-of-load supplies, and microprocessor core power delivery.
For engineers reviewing the MAX20796GFB+T datasheet, MAX20796GFB+T pinout, MAX20796GFB+T application, or MAX20796GFB+T equivalent, key selection considerations include its 35-pin FC2QFN package, two-phase interleaved architecture with 180° phase shift, PMBus Rev 1.3 telemetry (READ_VOUT ±1%, READ_IOUT ±3.6A), coupled-inductor support, and RESTORE-triggered output voltage reversion to pin-strapped setpoint.
Technical Context
The MAX20796GFB+T implements a multiphase peak-current-mode control loop with differential remote sensing (SNSP/SNSN), dual PI compensation stages (PI_V and PI_I), slope compensation, and OCR-based current balancing - enabling fast transient response and monotonic startup even with prebiased outputs. Its architecture supports both discrete and coupled inductors, with inherent 180° interleaving reducing output ripple and input capacitor RMS stress.
It integrates two 1.8V LDOs (AVDD/DVDD and VCC1/VCC2) powered from VLDOIN (2.97V–16V), allowing single-supply operation when VLDOIN is tied to VDDH or driven externally (e.g., via EB-driven nFET). Fault protection includes fast average/peak OCP per phase (10–33.3A programmable), ±72A peak LX current rating, PGOOD monitoring, and comprehensive UVLO thresholds on VDDH, VCC, AVDD, and VBST.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 16V - supports standard 5V, 12V, and 15V intermediate bus rails without external level shifting. |
| Output Current Capacity | 60A max (two-phase internal); scalable to 90A with external MAX20766 power stage - enables flexible BOM reuse across power tiers. |
| Output Voltage Range | 0.5V to 5.5V - covers CPU core (0.6–1.2V), memory VDDQ (1.2–1.8V), and I/O (3.3V, 5V) rails with direct feedback accuracy of ±0.8%. |
| Switching Frequency | 200kHz to 799kHz (pin-strap or PMBus programmable) - balances efficiency, size, and EMI; typical 400kHz/800kHz configurations validated in EV kits. |
| PMBus Compliance | PMBus Rev 1.3 - enables real-time telemetry (VIN, VOUT, IOUT, temperature), configurable OCP/soft-start, nonvolatile command storage (5 writes), and standardized fault reporting. |
| Thermal Performance | θJA = 9.6°C/W on EV kit (4-layer board); junction range –40°C to +125°C - supports high-density server PCB layouts with forced-air cooling. |
| Protection Features | Positive/negative OCP, overtemperature, input UVLO (4.40V threshold), output OVP/UVP (±210mV tracking), and PGOOD assertion - ensures robust operation under load transients and fault conditions. |
Pinout & Package
Package: 35-pin FC2QFN, 4mm × 10.5mm, 0.5mm pitch, exposed thermal pad - optimized for high-current density and thermal dissipation in networking and server applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDH1 / VDDH2 | High-side MOSFET input supply | Independent 4.5V–16V inputs per phase; enable asymmetric input routing or redundancy. |
| LX1 / LX2 | Switching node | Direct connection to inductor; rated for ±72A peak current per phase with AC limits up to +23V. |
| BST1 / BST2 | Bootstrap supply | Drives high-side gate drivers; requires 0.22μF ceramic capacitor to LX per phase. |
| SNSP / SNSN | Differential output voltage sense | Enables remote sensing for ±0.8% DC accuracy; rejects PCB IR drop in high-current paths. |
| EN | Active-high enable | 20μs turn-on delay after logic-high threshold (0.9V); supports sequencing with upstream controllers. |
| RESTORE | Output voltage reset trigger | Falling edge restores VOUT to PGMA-set value; 10μs deglitch prevents noise-induced resets. |
| PGOOD | Power-good status indicator | Open-drain output asserting when VOUT is within ±285mV (0.5–2.437V range) of DAC setpoint. |
| SDA / SCL | PMBus interface | Supports 1MHz operation; logic thresholds defined at 0.8V/1.45V; 1μA leakage ensures bus stability. |
| EB | External LDO FET driver | Drives nFET to generate 3V for VLDOIN - reduces thermal load vs. internal LDO when only VDDH is available. |
| CS / PWM / TS_FAULT | External power-stage interface | Enables seamless integration with MAX20766: CS senses current, PWM drives gate, TS_FAULT reports thermal faults. |
Key Features
| Feature | Design Value |
|---|---|
| Peak efficiency 92% at 12VIN/1VOUT | Minimizes power loss and heatsink requirements in thermally constrained 1U server chassis. |
| Integrated loop compensation | Eliminates external compensation components - reduces BOM count and layout sensitivity. |
| Monotonic prebias startup (up to VOUT_COMMAND) | Prevents reverse current and system latch-up when powering up into an already-biased rail. |
| Nonvolatile PMBus command storage (5 writes) | Preserves custom configurations (OCP, soft-start, address) across power cycles without host intervention. |
| Coupled inductor support | Reduces required output capacitance by >30% vs. discrete inductors - lowers solution cost and footprint. |
| Accurate current and temperature sensing | READ_IOUT error ≤ ±3.6A at 50A; on-die temp sensor ±4°C - enables precise thermal derating and current sharing. |
Applications
| Server CPU Core Power | Telecom Point-of-Load |
|---|---|
Use Scenario: Delivering tightly regulated 0.8V–1.2V at up to 60A to high-performance x86 or ARM processors in 1U rack servers with strict thermal budgets. IC Role / Device Role / Timing Role: Dual-phase VRM controller managing gate drive, current sensing, and PMBus telemetry for dynamic voltage/frequency scaling (DVFS). Use Value: 92% peak efficiency and θJA = 9.6°C/W on EV kit enable operation at 55°C ambient with 200LFM airflow - avoiding costly liquid cooling. | Use Scenario: Providing stable 3.3V/5V auxiliary power to FPGA I/O banks, SerDes interfaces, and management controllers in 5G baseband units. IC Role / Device Role / Timing Role: Programmable PoL regulator with RESTORE-triggered voltage reversion for hot-swap recovery and firmware update sequencing. Use Value: Pin-strappable soft-start (0.5–8ms) and PMBus-configurable OCP prevent inrush damage during field-replaceable module insertion. |
| Memory VDDQ Supply | Network Switch ASIC Power |
Use Scenario: Generating 1.2V–1.8V for DDR4/DDR5 memory VDDQ rails with low noise and fast transient response to handle burst data transfers. IC Role / Device Role / Timing Role: Interleaved buck controller using coupled inductors to suppress output ripple below 10mVpp at 50A step load. Use Value: Differential remote sensing (SNSP/SNSN) maintains ±0.8% regulation despite 50mΩ PCB trace resistance - ensuring signal integrity margins. | Use Scenario: Powering multi-core network processors and packet forwarding ASICs requiring 0.75V–1.1V at 40–55A with real-time telemetry for thermal throttling. IC Role / Device Role / Timing Role: PMBus-enabled VRM providing READ_TEMPERATURE1 (±4°C) and READ_IOUT (±2.2A no-load) to host BMC for predictive fan control. Use Value: Nonvolatile storage of five PMBus commands allows factory-programmed thermal derating curves - eliminating host software dependencies. |
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-configured for 1V/800kHz with LEAD_LAG enabled; fixed R_ADDR and PGMx values - no external resistor programming required. | Targeted at volume production where design reuse and reduced qualification effort outweigh configurability needs. | Select MAX20796A when 1V/800kHz is the sole target; use MAX20796GFB+T for designs requiring runtime PMBus reconfiguration or multiple output voltages. |
| TPS546D24A | 60A dual-phase controller with PMBus 1.2; lacks integrated linear regulators - requires external 1.8V/3.3V bias supplies for DVDD/AVDD/VCC. | Preferred in industrial systems where extended temperature validation (-55°C to +125°C) and TI's long-term supply commitment are prioritized. | Choose TPS546D24A if leveraging TI's WEBENCH ecosystem or needing -55°C operation; MAX20796GFB+T offers superior single-rail simplicity and higher PMBus revision compliance. |
Compared with MAX20796A, the MAX20796GFB+T provides full hardware and PMBus configurability at the cost of additional external resistors; versus TPS546D24A, it eliminates three external bias rails but trades TI's industrial temp grade for Analog Devices' higher PMBus feature set and integrated thermal sensing.
Availability
MAX20796GFB+T is available at Aetrix Electronics and suitable for server motherboard development, 5G infrastructure power design, and high-end networking equipment requiring stable component supply, long-lifecycle assurance, and PMBus telemetry integration.
Supply support for MAX20796GFB+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
Analog Devices, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision, power, and connectivity applications.
The MAX20796GFB+T belongs to Analog Devices' Power Management product line, engineered specifically for high-current, digitally controlled point-of-load regulation in datacenter, telecom, and enterprise computing systems - emphasizing efficiency, thermal resilience, and standards-compliant telemetry.
FAQ
What is the maximum output current capability of the MAX20796GFB+T?
The MAX20796GFB+T delivers up to 60A using its integrated dual-phase power stage. When paired with an external power stage such as the MAX20766, the solution scales to 90A total output current. This scalability is achieved through the dedicated PWM, CS, and TS_FAULT interface pins, enabling seamless three-phase operation without redesigning the core controller layout.
Does the MAX20796GFB+T require multiple input supply rails?
No. The MAX20796GFB+T integrates two 1.8V linear regulators - one for AVDD/DVDD and another for VCC1/VCC2 - powered from a single VLDOIN input (2.97V–16V). VLDOIN can be supplied directly from VDDH (enabling true single-rail operation) or from an external 3.3V source to improve thermal performance. An optional external nFET driven by the EB pin further enhances efficiency when only VDDH is available.
How does the RESTORE pin function on the MAX20796GFB+T?
The RESTORE pin on the MAX20796GFB+T triggers a falling-edge–activated reversion of the output voltage to the value set by the PGMA resistor configuration. A built-in 10µs deglitch filter prevents false triggering from noise. This feature enables reliable recovery after firmware updates, hot-swap events, or configuration errors - restoring the nominal operating point without host processor intervention or PMBus command overhead.
Can the MAX20796GFB+T operate with coupled inductors?
Yes. The MAX20796GFB+T explicitly supports both coupled and discrete inductors. Coupled inductor operation reduces output current ripple by up to 50% compared to discrete designs, allowing fewer and smaller output capacitors while maintaining transient response. This capability is validated in the MAX20796CL2EVKIT# reference design and directly contributes to best-in-class power density for space-constrained server and networking applications.
What PMBus telemetry accuracy does the MAX20796GFB+T provide for output current measurement?
The MAX20796GFB+T provides READ_IOUT telemetry with ±2.2A error at no load and ±3.6A error at 50A full load (VOUT = 1.0V), as specified in the Electrical Characteristics table. This accuracy is achieved via integrated lossless current sensing and on-die calibration, enabling reliable real-time current monitoring for thermal management, load balancing, and fault diagnostics without external shunt resistors or amplifiers.
MAX20796GFB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 35-PowerVQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (2), Linear (LDO) (1)
- Number of Outputs:
- 3
- Frequency - Switching:
- 200kHz ~ 800kHz
- Voltage/Current - Output 1:
- 0.5 V ~ 5.5 V, 60A
- Voltage/Current - Output 2:
- 0.5 V ~ 5.5 V, 60A
- Voltage/Current - Output 3:
- Adjustable, Adjustable
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 4.5V ~ 16V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 35-FC2QFN (4x10.5)
MAX20796GFB+T FAQ
1.How can I place an order for MAX20796GFB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20796GFB+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 MAX20796GFB+T reliable?
The price and inventory of MAX20796GFB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20796GFB+T is usually 5 days.
3.What payment methods are accepted for MAX20796GFB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20796GFB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20796GFB+T?
MAX20796GFB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20796GFB+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 MAX20796GFB+T?
For technical support, including MAX20796GFB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20796GFB+T requirements.
6.How does Aetrix verify that MAX20796GFB+T is sourced from the original manufacturer or authorized distributors?
All MAX20796GFB+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 MAX20796GFB+T meets industry standards.
7.What is the process for return or replacement of MAX20796GFB+T?
All MAX20796GFB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20796GFB+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 MAX20796GFB+T part is unused and in its original packaging.
Return procedure for MAX20796GFB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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