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Analog Devices Inc./Maxim Integrated MAX77540AAFG+T
- Part No.:
- MAX77540AAFG+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 24-UFQFN
- Datasheet:
-
MAX77540AAFG+T.pdf
- Description:
- IC REG BCK PRG 3A/3A DL 24FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,691
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Product details
Overview
The MAX77540AAFG+T from Analog Devices is a dual-phase, 6A step-down DC-DC converter with adaptive COT current-mode control. It supports configurable operation as two independent 3A buck regulators or one 6A multiphase output, delivers 0.5V–5.2V outputs from a 4V–16V input, achieves ±0.5% VOUT accuracy at 25°C, and targets power delivery for microprocessors, FPGAs, and USB-C PD systems.
For engineers reviewing the MAX77540AAFG+T datasheet, MAX77540AAFG+T pinout, MAX77540AAFG+T application, or MAX77540AAFG+T equivalent, this page provides verified package mapping (24-FC2QFN), confirmed I²C address options (3 slave addresses), validated phase configuration logic (SEL1/SEL2), real-world efficiency data (94% peak at 7.6VIN/3.3VOUT), and documented thermal shutdown behavior (+165°C).
Technical Context
The MAX77540AAFG+T implements an adaptive constant-on-time (COT) current-mode architecture with independent per-phase current sensing (SNS1/SNS2) and programmable inductor peak current limits (1.1–4.95A). Its dual-phase topology supports both interleaved 6A operation and split 3A+3A configurations via SEL1/SEL2 pins or I²C register control.
It integrates dedicated internal bias rails (VL = 1.8V, VDD = 1.8V), supports alternative low-voltage input (ALT_IN) with 2.7–2.9V switchover threshold, and features hardware-enabling pins (EN1/EN2, FPWM1B/FPWM2B) alongside full I²C programmability-including soft-start/stop slew rates, dynamic voltage scaling, and spread-spectrum modulation for EMI reduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 16V - enables direct conversion from 3-cell Li+, USB PD, and 12V rails without pre-regulation. |
| Output Voltage Range | 0.5V to 5.2V - covers core voltages for modern SoCs, FPGAs, and DDR memory subsystems. |
| Max Output Current | 6A (2Φ) or 3A × 2 (1Φ) - scalable power delivery matching load transient profiles of high-performance processors. |
| VOUT Accuracy | ±0.5% at 25°C (default) - ensures stable supply for voltage-sensitive digital logic and analog peripherals. |
| Peak Efficiency | 94% at 7.6VIN/3.3VOUT/1MHz - minimizes thermal load and extends battery runtime in portable equipment. |
| Switching Frequency | 0.5/1.0/1.6MHz nominal - selectable for optimal trade-off between size, efficiency, and EMI in space-constrained designs. |
| Package | 24-pin FC2QFN (3mm × 3mm) - compact footprint with 36.64°C/W θJA on 4-layer board for thermal reliability. |
Pinout & Package
The MAX77540AAFG+T is packaged in a 24-pin FC2QFN (3mm × 3mm) with exposed thermal pad. Pin functions are defined per the official Analog Devices bump map for package code F243A3F+2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1 / IN2 | Main input power rails | Independent 4V–16V inputs per phase; support split-rail or redundant sourcing. |
| LX1 / LX2 | Power switch node outputs | Drive external high-side/low-side MOSFETs; require proper layout for EMI and thermal management. |
| SNS1 / SNS2 | Current sense inputs | Enable per-phase overcurrent protection and current-mode loop stability. |
| EN1 / EN2 | Phase enable controls | Hardware-level enable/disable of each buck phase; supports staggered startup and power sequencing. |
| FPWM1B / FPWM2B | Forced PWM mode inputs | Override SKIP/LP-SKIP modes for deterministic switching during noise-sensitive operation. |
| POK1 / POK2 | Power-good status outputs | Open-drain signals indicating regulated output voltage within ±5% tolerance. |
| SEL1 / SEL2 | Phase configuration select | Set 1Φ+1Φ or 2Φ mode at power-up; override possible via I²C after initialization. |
| I²C_EN | I²C interface enable | Activates SDA/SCL/ADDR functionality; allows hardware disable of serial interface for security or noise isolation. |
| IRQB | Interrupt request output | Active-low open-drain signal asserting on fault conditions (thermal, OCP, UVLO). |
| ALT_IN | Alternative low-voltage input | Enables seamless switchover to auxiliary 2.7–5.5V rail when main SYS drops below 2.7–2.9V. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive COT control | Delivers fast transient response (<10µs recovery) without external compensation components. |
| Configurable phase topology | Single 6A or dual 3A outputs selected via pins or I²C-enables flexible BOM reuse across product variants. |
| Spread-spectrum modulation | Reduces peak EMI by >10dB across 100kHz–10MHz band without sacrificing regulation performance. |
| Pre-biased startup | Allows safe turn-on into pre-charged output capacitors-critical for hot-swap and multi-rail sequencing. |
| Active output discharge | Internally discharges VOUT to ground when disabled-prevents floating rails and improves system safety. |
| Thermal warning & shutdown | Two-stage thermal monitoring (120°C warning, 140°C second warning, 165°C shutdown) with 15°C hysteresis. |
Applications
| Mobile Application Processor Power | FPGA Core & I/O Bank Supply |
|---|---|
Use Scenario: Powering ARM-based application processors (e.g., Qualcomm Snapdragon, MediaTek Dimensity) in smartphones and tablets with dynamic DVFS requirements. IC Role / Device Role / Timing Role: Dual-phase buck regulator delivering 0.6–1.2V core and 1.8V I/O rails with I²C-controlled dynamic voltage scaling. Use Value: Achieves <55mm² total solution size and 94% peak efficiency-extending battery life while meeting strict PCB area constraints. | Use Scenario: Supplying configurable core (0.75–0.95V) and I/O (1.2–3.3V) voltages for Xilinx Artix/Kintex and Intel Cyclone/Arria FPGAs. IC Role / Device Role / Timing Role: High-current, low-noise power source with programmable soft-start and ramp rates to prevent inrush-induced logic glitches. Use Value: Enables precise sequencing of multiple FPGA supply domains using EN1/EN2 and POK1/POK2 status feedback. |
| USB-C Power Delivery Sink | PCIe/RAID Controller Card |
Use Scenario: Regulating variable 5–20V USB-C PD input to fixed 3.3V/5V rails for embedded controllers and Type-C port partner negotiation ICs. IC Role / Device Role / Timing Role: Wide-input buck converter supporting ALT_IN switchover to maintain operation during PD contract renegotiation. Use Value: Maintains uninterrupted power during USB-C voltage transitions-eliminating need for backup capacitors or secondary LDOs. | Use Scenario: Providing 12V-to-3.3V/1.8V conversion for PCIe Gen4/Gen5 switch and RAID controller ASICs in enterprise storage systems. IC Role / Device Role / Timing Role: High-efficiency, thermally robust power stage handling up to 6A continuous load with forced-PWM mode for deterministic timing. Use Value: Delivers 94% efficiency at full load-reducing heat sink requirements and enabling fanless operation in dense 1U chassis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-phase buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ8633BGLE-Z | 4.5–16V input; 6A max; fixed 1.2MHz fSW; no ALT_IN or spread-spectrum; QFN-21 package | Lacks I²C programmability, thermal warnings, and dual-input flexibility-suited for cost-sensitive, static-voltage applications. | Select when design prioritizes lowest BOM cost over configurability and EMI control. |
| TPS546D24RSAR | 4–16V input; 6A max; PMBus interface; integrated MOSFETs; 3.5mm × 4.5mm QFN-26 | Includes PMBus telemetry (voltage/current/temp), but no spread-spectrum or ALT_IN-better for telemetry-driven server power. | Select when real-time telemetry and margining are required over EMI suppression and auxiliary input support. |
Compared with MPQ8633BGLE-Z and TPS546D24RSAR, the MAX77540AAFG+T uniquely combines I²C programmability, spread-spectrum EMI reduction, ALT_IN switchover, and dual-phase configurability in a 3mm × 3mm FC2QFN-making it optimal for portable, noise-sensitive, and dynamically powered systems.
Availability
The MAX77540AAFG+T is available at Aetrix Electronics and suitable for mobile processor power, FPGA supply, USB-C PD sink, PCIe card, and RAID controller applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX77540AAFG+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 leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and consumer markets.
The MAX77540AAFG+T belongs to Analog Devices' MAX® power management portfolio, designed specifically for high-efficiency, space-constrained, and dynamically reconfigurable power delivery in battery-powered and USB-C–enabled systems.
FAQ
What is the maximum junction temperature specification for the MAX77540AAFG+T?
The MAX77540AAFG+T has a maximum junction temperature of +150°C, with thermal shutdown triggered at +165°C and thermal warnings asserted at +120°C and +140°C. These thresholds include 15°C hysteresis to prevent oscillation during thermal transients. The device's 36.64°C/W θJA on a four-layer board enables reliable operation up to +125°C ambient when properly heatsinked.
Does the MAX77540AAFG+T support I²C communication, and what are its addressing options?
Yes, the MAX77540AAFG+T supports high-speed I²C communication with three configurable slave addresses (0x68, 0x69, 0x6A) set via the ADDR pin. I²C functionality is enabled only when the I2C_EN pin is pulled high; otherwise, the interface remains inactive. This allows secure, noise-immune programming of output voltages, soft-start times, current limits, and operating modes without requiring additional MCU GPIOs.
How does the MAX77540AAFG+T handle input voltage switchover between SYS and ALT_IN?
The MAX77540AAFG+T automatically switches from the main SYS rail to the ALT_IN rail when SYS falls below 2.7–2.9V (with 100mV hysteresis), provided ALT_IN is present and valid (2.7–5.5V). This switchover is seamless and maintains regulated output-critical for maintaining operation during USB-C PD contract renegotiation or battery brownout events. The feature is available only in the WLP package variant; the FC2QFN version (including MAX77540AAFG+T) does not support ALT_IN.
What protection features are integrated into the MAX77540AAFG+T?
The MAX77540AAFG+T integrates undervoltage lockout (UVLO) on SYS (3.8V rising, 3.5V falling), thermal shutdown (+165°C), short-circuit protection, and per-phase overcurrent detection via SNS1/SNS2. It also provides power-good (POK1/POK2) monitoring, interrupt assertion (IRQB) on fault, and active output discharge upon disable-all implemented in hardware without firmware dependency.
Can the MAX77540AAFG+T operate in forced-PWM mode, and how is it activated?
Yes, the MAX77540AAFG+T supports forced-PWM (FPWM) mode to eliminate frequency variation and minimize acoustic noise. FPWM mode is activated per phase by pulling FPWM1B or FPWM2B low. In this mode, the converter operates at the programmed switching frequency (0.5/1.0/1.6MHz) regardless of load, ensuring deterministic timing for EMI-sensitive applications like audio subsystems or high-speed ADC/DAC clocks.
MAX77540AAFG+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-UFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.2V
- Current - Output:
- 3A, 3A
- Frequency - Switching:
- 500kHz, 1MHz, 1.6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-FC2QFN (3x3)
MAX77540AAFG+T FAQ
1.How can I place an order for MAX77540AAFG+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77540AAFG+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 MAX77540AAFG+T reliable?
The price and inventory of MAX77540AAFG+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77540AAFG+T is usually 5 days.
3.What payment methods are accepted for MAX77540AAFG+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77540AAFG+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77540AAFG+T?
MAX77540AAFG+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77540AAFG+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 MAX77540AAFG+T?
For technical support, including MAX77540AAFG+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77540AAFG+T requirements.
6.How does Aetrix verify that MAX77540AAFG+T is sourced from the original manufacturer or authorized distributors?
All MAX77540AAFG+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 MAX77540AAFG+T meets industry standards.
7.What is the process for return or replacement of MAX77540AAFG+T?
All MAX77540AAFG+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77540AAFG+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 MAX77540AAFG+T part is unused and in its original packaging.
Return procedure for MAX77540AAFG+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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