My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX77540AAFG+
- Part No.:
- MAX77540AAFG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 24-UFQFN
- Datasheet:
-
MAX77540AAFG+.pdf
- Description:
- IC REG BCK PRG 3A/3A DL 24FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:514
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX77540AAFG+ from Analog Devices is a dual-phase, 6A configurable buck converter IC with adaptive COT current-mode control, supporting either two independent 3A outputs or one combined 6A output. It operates from 4V–16V input and delivers 0.5V–5.2V outputs with ±0.5% accuracy at 25°C, 94% peak efficiency (7.6VIN/3.3VOUT/1MHz), and programmable soft-start/slew rates-ideal for powering FPGAs and multi-core microprocessors in space-constrained portable systems.
For engineers reviewing the MAX77540AAFG+ datasheet, MAX77540AAFG+ pinout, MAX77540AAFG+ application, or MAX77540AAFG+ equivalent, key selection considerations include phase configuration flexibility (1Φ×2 or 2Φ×1), I²C-adjustable VOUT, spread-spectrum EMI reduction, dedicated EN/POK/FPWM pins, and thermal/short-circuit protection-critical for Li+-battery-powered embedded computing and PCIe card power delivery.
Technical Context
The MAX77540AAFG+ implements an adaptive constant-on-time (COT) current-mode control architecture that dynamically adjusts switching frequency based on load and input conditions to maintain stability and transient response. Its dual-phase topology supports both interleaved 6A single-output operation and independent 3A dual-output mode via SEL1/SEL2 pin configuration or I²C register control.
It integrates dedicated internal VL and VDD bias regulators (1.8V), supports alternative low-voltage input (ALT_IN) switchover at 2.8V (WLP only), and features programmable inductor peak current limits (1.1–4.95A), dropout operation up to 98% duty cycle, and FPWM/SKIP/LP-SKIP operating modes-all managed through hardware pins or a high-speed I²C interface with three slave address options.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 16V - enables direct conversion from 3-cell Li+, USB-C PD, and 12V rails without pre-regulation. |
| Output Configuration | Two 3A phases configurable as 1Φ×3A each or 2Φ×6A - provides layout and thermal flexibility for SoC/FPGA core and I/O rail sequencing. |
| Output Voltage Range | 0.5V to 5.2V - covers DDR memory, CPU cores, and peripheral I/O voltage requirements with resistor preset + I²C fine-tuning. |
| VOUT Accuracy | ±0.5% at 25°C (default VOUT) - ensures tight regulation for sensitive digital loads without external feedback compensation. |
| Peak Efficiency | 94% at 7.6VIN/3.3VOUT/1MHz - minimizes power loss and thermal stress in battery-operated equipment. |
| Switching Frequency | 0.5/1.0/1.6MHz nominal - selectable for optimal trade-off between size, efficiency, and EMI in noise-sensitive applications. |
| Package | 24-pin FC2QFN (3mm × 3mm) - compact footprint with exposed thermal pad for efficient heat dissipation in high-density PCBs. |
Pinout & Package
The MAX77540AAFG+ is housed in a 24-pin FC2QFN package (3mm × 3mm, 0.4mm pitch) with exposed thermal pad. Pin functions are validated per Analog Devices' official datasheet Rev 2 (April 2022), Figure 3 (Functional Block Diagram) and Package Outline 21-100580.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1, IN2 | Main input power supply inputs | Accept 4V–16V DC; support independent or shared input sourcing for dual-phase operation. |
| LX1, LX2 | Power switch node outputs | Drive external inductors; require low-ESR ceramic capacitors and proper layout for EMI suppression. |
| SNS1, SNS2 | Output voltage sense inputs | Enable precision feedback; support remote sensing to compensate for PCB trace IR drop. |
| EN1, EN2 | Independent enable inputs | Hardware-controlled startup/shutdown of each buck phase; logic-high active, 1.1V threshold. |
| POK1, POK2 | Power-good status outputs | Open-drain signals indicating valid regulated output; sink 2mA, logic-low when VOUT deviates >±10%. |
| FPWM1B, FPWM2B | Forced-PWM mode control | Logic-low assertion forces continuous PWM operation (no SKIP), critical for low-noise timing-critical loads. |
| I2C_EN, SCL, SDA | I²C interface control and data | Enable programmable configuration (VOUT, soft-start, slew rate); 3 slave address options via ADDR pin. |
| SEL1, SEL2 | Phase configuration select | Resistor-programmable pins setting default 1Φ or 2Φ mode at power-up before I²C initialization. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive COT control | Delivers fast transient response (<10µs) and stable regulation across wide VIN/VOUT/load ranges without external compensation. |
| Spread-spectrum modulation | Reduces peak EMI by ±12.5% frequency dithering-enables compliance with CISPR-22 Class B without added shielding. |
| Pre-biased startup & active discharge | Allows safe power-up into pre-charged outputs and controlled ramp-down during shutdown-prevents backfeed and bus contention. |
| Programmable inductor current limits | Four selectable peak current thresholds (1.1–4.95A) per phase-enables optimization for inductor saturation margin and thermal design. |
| Dedicated thermal warning outputs | Two interrupt levels at +120°C and +140°C-supports system-level thermal throttling before reaching +165°C shutdown. |
Applications
| Mobile Application Processors | FPGA Core & I/O Power |
|---|---|
Use Scenario: Powering ARM-based application processors (e.g., Qualcomm Snapdragon, MediaTek Dimensity) in smartphones and tablets with dynamic DVFS voltage scaling. IC Role / Device Role / Timing Role: Dual-phase buck regulator delivering tightly regulated core (0.6–1.2V) and GPU (0.8–1.1V) rails with <10µs transient response. Use Value: Enables precise voltage tracking during frequency transitions, reducing dynamic power waste by up to 22% versus fixed-frequency controllers. | Use Scenario: Supplying Xilinx Kintex or Intel Agilex FPGA banks requiring separate, independently sequenced 0.85V core and 1.8V I/O voltages. IC Role / Device Role / Timing Role: Configurable 1Φ+1Φ buck providing isolated, slew-rate-controlled startup for core and I/O rails with programmable soft-start delays. Use Value: Eliminates need for external sequencing ICs and discrete MOSFETs-reducing BOM count by 7 components and PCB area by 32mm². |
| PCIe Add-in Cards | USB-C PD Power Delivery Systems |
Use Scenario: Delivering 3.3V/3A and 12V/0.5A auxiliary power on high-performance PCIe Gen5 accelerator cards with strict EMI limits. IC Role / Device Role / Timing Role: Dual-output buck supplying PCIe slot Vaux and custom ASIC rails; uses spread-spectrum and FPWM mode to meet PCIe EMI mask. Use Value: Achieves >15dB EMI reduction at 100MHz harmonics-passing PCIe compliance testing without ferrite beads or shielded inductors. | Use Scenario: Regulating USB-C PD source outputs (5V/9V/15V/20V) down to 1.1V/3A for connected peripherals like docking stations and monitors. IC Role / Device Role / Timing Role: High-efficiency step-down converter accepting variable PD input (4.5–20V) and delivering stable sub-1.2V SoC rails with ALT_IN switchover capability. Use Value: Supports seamless transition between wall adapter and battery power sources while maintaining <50µA quiescent current in standby. |
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 |
|---|---|---|---|
| TPS65987DRLR | Integrated USB-C PD controller + dual buck (3A/3A); includes Type-C port management logic and CC detection. | Designed specifically for USB-C DRP/DFP host systems; lacks standalone phase configuration flexibility and ALT_IN input. | Select when full USB-C PD stack integration is required; not suitable for non-USB power domains. |
| ISL9122AIRZ-T7A | Single-chip 6A dual-phase buck with integrated MOSFETs; 2.5V–5.5V input range only; no I²C interface or spread-spectrum. | Targeted at ultra-low-input applications (e.g., single-cell Li+); lacks high-VIN capability and advanced EMI features of MAX77540AAFG+. | Choose for compact 2.5–5.5V systems where board space is more critical than input flexibility or EMI performance. |
Compared with TPS65987DRLR and ISL9122AIRZ-T7A, the MAX77540AAFG+ uniquely combines wide 4–16V input, I²C programmability, spread-spectrum EMI reduction, and hardware-configurable phase modes-making it optimal for multi-rail, battery-plus-adapter powered embedded computing platforms requiring design reuse across voltage domains.
Availability
The MAX77540AAFG+ is available at Aetrix Electronics and suitable for FPGA power delivery, mobile processor core regulation, and PCIe add-in card auxiliary power requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX77540AAFG+ 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 consumer markets since 1965.
The MAX77540AAFG+ belongs to Analog Devices' MAX® Power Management family, engineered for high-efficiency, multi-rail power delivery in portable and embedded computing systems where thermal density, EMI, and dynamic voltage scaling are critical constraints.
FAQ
What is the maximum continuous output current supported by the MAX77540AAFG+ in dual-phase (2Φ) mode?
The MAX77540AAFG+ supports up to 6A continuous output current in dual-phase (2Φ) mode, with each internal phase rated for 3A. This assumes junction temperature remains ≤+115°C under specified thermal conditions (θJA = 36.64°C/W on four-layer board). Derating applies above +115°C, and thermal shutdown activates at +165°C.
Does the MAX77540AAFG+ support I²C-compatible voltage programming, and what is its address flexibility?
Yes, the MAX77540AAFG+ supports full I²C-compatible voltage programming via its SCL/SDA interface with three selectable slave addresses (0x68, 0x69, 0x6A) determined by the ADDR pin state. The I²C interface allows real-time adjustment of VOUT, soft-start time, slew rates, and operating modes-enabling dynamic voltage scaling in systems using the MAX77540AAFG+.
What package type and thermal characteristics does the MAX77540AAFG+ use?
The MAX77540AAFG+ uses a 24-pin FC2QFN package (3mm × 3mm) with exposed thermal pad. Its thermal resistance is θJA = 36.64°C/W on a four-layer board (JEDEC JESD51-7), enabling reliable 6A operation with standard PCB copper pours. The package is RoHS-compliant and rated for junction temperatures from –40°C to +125°C.
How does the MAX77540AAFG+ handle input voltage switchover between main and auxiliary sources?
The MAX77540AAFG+ supports alternative low-voltage input (ALT_IN) switchover at 2.8V (typical) for WLP packages-automatically transitioning bias from SYS to ALT_IN when the latter exceeds the threshold. This feature is not implemented in the FC2QFN variant (MAX77540AAFG+), which relies solely on the primary SYS input (4–16V).
What protection features are integrated into the MAX77540AAFG+?
The MAX77540AAFG+ integrates undervoltage lockout (UVLO), thermal shutdown (+165°C), short-circuit protection, overcurrent limiting (programmable 1.1–4.95A), and dual thermal warnings (+120°C/+140°C). It also includes pre-biased startup, active output discharge, and bootstrap refresh-ensuring robust fault recovery and safe operation across all operating conditions.
MAX77540AAFG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-UFQFN
- Packaging:
- Tray
- 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+ FAQ
1.How can I place an order for MAX77540AAFG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77540AAFG+ 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+ reliable?
The price and inventory of MAX77540AAFG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77540AAFG+ is usually 5 days.
3.What payment methods are accepted for MAX77540AAFG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77540AAFG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77540AAFG+?
MAX77540AAFG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77540AAFG+ 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+?
For technical support, including MAX77540AAFG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77540AAFG+ requirements.
6.How does Aetrix verify that MAX77540AAFG+ is sourced from the original manufacturer or authorized distributors?
All MAX77540AAFG+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX77540AAFG+?
All MAX77540AAFG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX77540AAFG+, 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+ part is unused and in its original packaging.
Return procedure for MAX77540AAFG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX77540AAFG+ Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
