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Analog Devices Inc./Maxim Integrated MAX20828TAFH+
- Part No.:
- MAX20828TAFH+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 21-PowerWFQFN
- Datasheet:
-
MAX20828TAFH+.pdf
- Description:
- IC REG BCK ADJ 8A/8A DL 21FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,975
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Product details
Overview
MAX20828TAFH+ from Analog Devices is a dual-output, fully integrated step-down DC-DC switching regulator delivering up to 8A per output (16A in dual-phase mode), operating from 2.7V–16V input and regulating outputs from 0.5V–5.8V with configurable 500kHz–3MHz switching frequency. It integrates internal 1.8V LDOs for gate drive (VCC) and analog circuitry (AVDD), supports pin-strap programming via three PGM pins, and features active current balancing for dual-phase operation - deployed in high-density point-of-load power delivery for servers and networking equipment.
For engineers reviewing the MAX20828TAFH+ datasheet, MAX20828TAFH+ pinout, MAX20828TAFH+ application, or MAX20828TAFH+ equivalent, key selection criteria include dual-output vs. dual-phase configuration flexibility, 180° interleaved operation for ripple cancellation, selectable AMS for improved transient response, DCM enablement for light-load efficiency, and thermal performance up to +125°C junction temperature in the compact FC2QFN package.
Technical Context
The MAX20828TAFH+ implements fixed-frequency, peak current-mode control with internal compensation and independent error amplifiers per output. Its dual regulators operate 180° out-of-phase to reduce input/output ripple and improve thermal distribution. The architecture supports both independent dual-output regulation and single-output dual-phase operation via SNSP2-to-AVDD connection.
Pin-strap programmability (PGM0/PGM1/PGM2) configures switching frequency, POCP threshold (7.7A or 11.5A), AMS enablement, and DCM operation. Protection includes positive/negative overcurrent (POCP/NOCP), output overvoltage (OVP), undervoltage lockouts (VDDH/AVDD/LDOIN UVLO), and overtemperature shutdown (155°C) with 20ms hiccup recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 16V - supports wide-range industrial and server supply rails including 3.3V, 5V, 12V, and 15V inputs without external biasing. |
| Output Current (per channel) | Up to 8A continuous - enables high-current PoL conversion for ASICs, FPGAs, and memory subsystems with minimal external components. |
| Switching Frequency | Configurable 500kHz to 3.0MHz - allows trade-off between solution size (higher fSW → smaller inductors/caps) and efficiency (lower fSW → lower switching loss). |
| Feedback Reference Voltage | 0.500V ±5mV - provides precise output regulation down to 0.5V with tight accuracy across -40°C to +125°C junction temperature. |
| Junction Temperature Range | -40°C to +125°C - validated for continuous operation at full load in thermally constrained environments such as sealed server chassis. |
| Package Thermal Resistance (θJC) | 10.1°C/W - enables efficient heat transfer to PCB copper, supporting high-power density designs without heatsinks under 200LFM airflow. |
| Peak Efficiency | 92.5% at VDDH=12V, VOUT=1.8V, fSW=1MHz - achieved with optimized gate drive and low-RDS(on) integrated MOSFETs, reducing thermal stress and system cooling requirements. |
Pinout & Package
MAX20828TAFH+ is housed in a compact 3.5mm × 4.6mm, 21-pin FC2QFN package with exposed thermal pad, rated for -40°C to +125°C junction temperature operation and footprint-compatible with MAX20808T/MAX20812T series.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDH1 / VDDH2 | Input supply for Output 1 / Output 2 | Independent high-side input rails; must be connected together on PCB for shared input source; supports up to 16V with -0.3V to +19V absolute max rating. |
| LX1 / LX2 | Switching node for Output 1 / Output 2 | Direct connection point to external inductor; carries high di/dt; requires short, low-inductance layout to minimize EMI and voltage spikes. |
| BST1 / BST2 | Bootstrap supply for high-side gate driver | Each connects via 0.22µF ceramic capacitor to respective LX pin; enables efficient N-channel high-side MOSFET drive without external charge pump. |
| SNSP1 / SNSP2 | Output voltage sense feedback input | Connects to regulated output (or divider network) for closed-loop control; tying SNSP2 to AVDD configures dual-phase mode and disables Output 2 control loop. |
| EN1 / EN2 | Enable input for Output 1 / Output 2 | Logic-level enable with 0.6V/0.9V thresholds; independent control allows staggered startup, power sequencing, or fault isolation per rail. |
| PGOOD1 / PGOOD2 | Open-drain power-good status indicator | Asserts low during UV/OV/fault conditions; requires external pull-up; used for system power sequencing and health monitoring. |
| PGM0 / PGM1 / PGM2 | Pin-strap configuration inputs | Resistor-to-ground selection sets switching frequency, POCP threshold (7.7A/11.5A), AMS, and DCM modes - eliminates need for I²C or digital interface. |
| VCC / AVDD / AGND / PGND1 / PGND2 | Internal LDO output / analog supply / ground references | VCC = 1.8V gate drive supply (min 2.2µF decoupling); AVDD = 1.8V analog core supply (via 2.2–4.7Ω resistor from VCC); separate AGND/PGND reduces noise coupling. |
| LDOIN | Optional external bias input (2.5V–5.5V) | When used, replaces VDDH-derived VCC generation to improve efficiency; supports direct connection to stable 3.3V or 5V system rail. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output or dual-phase reconfiguration | Single IC supports two independent 8A rails OR one 16A rail via SNSP2-to-AVDD strap - reduces BOM count and board area versus discrete solutions. |
| 180° interleaved operation | Halves input/output ripple current magnitude and improves thermal distribution across PCB - lowers RMS current in input capacitors by ~30%. |
| Selectable Advanced Modulation Scheme (AMS) | Enables leading-edge + trailing-edge PWM modulation during transients - reduces output voltage deviation by up to 40% vs. standard PWM under 10A/µs load steps. |
| Discontinuous Conduction Mode (DCM) | Automatically engages below ~100mA load per phase - reduces light-load quiescent current to 0.1mA and maintains >85% efficiency at 10mA output. |
| Active current balancing (dual-phase) | Real-time phase-current correction maintains ≤±3% imbalance across load steps and temperature - critical for stable 16A delivery without derating. |
| Integrated 1.8V LDOs with optional LDOIN bias | VCC powers gate drivers; AVDD powers analog core; external 2.5–5.5V on LDOIN bypasses VDDH-based regulation - improves full-load efficiency by 1.2% at 12V input. |
Applications
| Server CPU Core Power | AI Accelerator Module Supply |
|---|---|
|
Use Scenario: Delivering tightly regulated 0.8V–1.2V at up to 16A to high-performance CPUs in 1U rack servers with strict thermal envelope limits. IC Role / Device Role / Timing Role: Dual-phase buck controller providing synchronized, interleaved switching with active current balancing and fast transient response. Use Value: Enables single-chip 16A solution with <1% output deviation under 8A/µs load steps, eliminating need for multiple discrete controllers and reducing PCB area by 35%. |
Use Scenario: Powering heterogeneous AI accelerators (e.g., TPUs, NPUs) requiring multiple independent rails (e.g., 0.8V core, 1.2V memory, 3.3V I/O) from a common 12V backplane. IC Role / Device Role / Timing Role: Dual-output regulator with independent enable, PGOOD, and feedback loops - supports flexible rail sequencing and dynamic voltage scaling. Use Value: Delivers two precisely tracked outputs with <±5mV accuracy across temperature, enabling compliance with JEDEC DDR5 and CXL power specs without external DACs. |
| 5G Baseband Unit (BBU) Power | Enterprise Switch ASIC Supply |
|
Use Scenario: Generating 1.8V @ 8A and 3.3V @ 8A for FPGA-based baseband processing in outdoor 5G radios with ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: Dual-output buck converter with extended junction temperature rating (+125°C), integrated thermal protection, and robust UV/OV fault handling. Use Value: Maintains full 8A output capability at TA = +85°C with no airflow - eliminates need for forced cooling and simplifies enclosure design. |
Use Scenario: Providing 0.75V @ 12A core supply and 1.8V @ 4A I/O supply to multi-port Ethernet switches in data center top-of-rack (ToR) deployments. IC Role / Device Role / Timing Role: Configured in dual-phase mode for core rail and dual-output mode for I/O rail - leverages single IC for mixed-voltage, mixed-current requirements. Use Value: Reduces total solution size by 28% vs. dual-controller approach while maintaining <10µs PGOOD assertion delay for system-level power sequencing compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20808TAFH+ | Single-output, 16A dual-phase buck; lacks second independent output and SNSP2 feedback path; identical pinout and package. | Only suitable when only one high-current rail is needed; cannot support dual independent rails like memory + core. | Select MAX20808TAFH+ if system requires only one high-current output and space is constrained - same layout but reduced functionality. |
| TPS546D24RVFT | 6V–18V input, dual-output 10A/10A; uses external compensation; supports PMBus for telemetry and dynamic voltage scaling. | Requires external resistors/caps for loop tuning; adds telemetry overhead but enables real-time margining and fault logging. | Choose TPS546D24RVFT when digital control, telemetry, or adaptive voltage scaling are required - trades simplicity for configurability. |
Compared with MAX20808TAFH+, the MAX20828TAFH+ adds true dual-output flexibility and independent feedback, while TPS546D24RVFT offers digital interface and telemetry at the cost of increased design complexity and external component count.
Availability
MAX20828TAFH+ is available at Aetrix Electronics and suitable for data center power, communications infrastructure, and enterprise networking applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX20828TAFH+ 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX20828TAFH+ belongs to Analog Devices' high-density power management portfolio, designed specifically for space-constrained, high-efficiency point-of-load conversion in cloud-scale infrastructure and AI hardware.
FAQ
What is the maximum output current supported by MAX20828TAFH+ in dual-phase mode?
The MAX20828TAFH+ supports up to 16A continuous output current in dual-phase configuration, with active current balancing ensuring ≤±3% phase mismatch under dynamic loads. This is achieved by connecting SNSP2 to AVDD, disabling Output 2's control loop, and using both channels in interleaved operation - verified across -40°C to +125°C junction temperature with appropriate thermal design.
Can MAX20828TAFH+ operate with only one output enabled?
Yes, MAX20828TAFH+ supports independent enable/disable of each output via EN1 and EN2 pins. When EN2 is held low, Output 2 is disabled while Output 1 remains fully functional with its own PGOOD1, feedback, and regulation - enabling flexible power sequencing and partial-system operation without compromising stability or efficiency of the active rail.
How does the Advanced Modulation Scheme (AMS) improve transient response in MAX20828TAFH+?
The AMS in MAX20828TAFH+ enables both leading-edge and trailing-edge PWM modulation during large load transients, reducing output voltage deviation by up to 40% compared to standard fixed-frequency PWM. This occurs because AMS allows immediate duty-cycle adjustment within the same switching cycle, minimizing reliance on output capacitance and enabling smaller, lower-cost bulk capacitor designs.
What is the purpose of the LDOIN pin on MAX20828TAFH+ and how should it be used?
The LDOIN pin on MAX20828TAFH+ accepts an external 2.5V–5.5V bias supply to power the internal 1.8V VCC LDO, improving efficiency by bypassing the VDDH-based linear regulator. When connected to a clean 3.3V system rail, it reduces full-load power loss by ~1.2% at 12V input - particularly valuable in thermally limited applications where every watt of dissipation matters.
Does MAX20828TAFH+ require external compensation components?
No, MAX20828TAFH+ features fully internal compensation for both control loops, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design, reduces BOM count, and ensures consistent loop stability across temperature and manufacturing variation - confirmed by Analog Devices' characterization over -40°C to +125°C junction range.
MAX20828TAFH+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 21-PowerWFQFN
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.8V
- Current - Output:
- 8A, 8A
- Frequency - Switching:
- 500KHz ~ 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 21-FC2QFN (3.5x4.6)
MAX20828TAFH+ FAQ
1.How can I place an order for MAX20828TAFH+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20828TAFH+ 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 MAX20828TAFH+ reliable?
The price and inventory of MAX20828TAFH+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20828TAFH+ is usually 5 days.
3.What payment methods are accepted for MAX20828TAFH+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20828TAFH+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20828TAFH+?
MAX20828TAFH+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20828TAFH+ 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 MAX20828TAFH+?
For technical support, including MAX20828TAFH+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20828TAFH+ requirements.
6.How does Aetrix verify that MAX20828TAFH+ is sourced from the original manufacturer or authorized distributors?
All MAX20828TAFH+ 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 MAX20828TAFH+ meets industry standards.
7.What is the process for return or replacement of MAX20828TAFH+?
All MAX20828TAFH+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20828TAFH+, 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 MAX20828TAFH+ part is unused and in its original packaging.
Return procedure for MAX20828TAFH+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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