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Analog Devices Inc./Maxim Integrated MAX77756DEWL+T
- Part No.:
- MAX77756DEWL+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX77756DEWL+T.pdf
- Description:
- IC REG BUCK WIDE INPUT VOLTAGE
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Inventory:1,011
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Product details
Overview
MAX77756DEWL+T from Maxim Integrated is a 24V-input, 500mA synchronous step-down DC-DC converter with integrated dual-input ideal-diode power multiplexer (MUX). It operates from 3.0V to 24V input, delivers factory-default 1.8V/3.3V/5.0V output (I²C-adjustable from 1.5V to 7.5V), and features 1.5μA quiescent current in SUP-only mode. It enables seamless source selection between two independent DC inputs (e.g., main + backup battery) in USB PD accessories and always-on smart hubs.
For engineers reviewing the MAX77756DEWL+T datasheet, MAX77756DEWL+T pinout, MAX77756DEWL+T application, or MAX77756DEWL+T equivalent, key selection criteria include dual-input MUX behavior, I²C-programmable VOUT with 50mV steps, 15-bump WLP package constraints, and 250mΩ IN1/IN2 on-resistance for low-loss ORing.
Technical Context
The MAX77756DEWL+T integrates a peak-current-mode PWM buck regulator with synchronous rectification and an autonomous dual-input power MUX using P-channel MOSFETs. The MUX selects the higher of IN1 or IN2 (3V–24V) to supply the SUP rail, with 400mV switchover hysteresis and automatic cross-conduction prevention.
Control includes hardware/software enable (EN pin or I²C EN_BIT), pin-programmable inductor peak current (700–1000mA), spread-spectrum switching (±6% ΔfSW), and soft-start (4ms or 8ms). Output regulation uses internal feedback (factory-set) or external resistor divider (1V to 99% VSUP), with POK monitoring at 90–94% VOUT-REG.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 24V - supports wide-range sources including USB PD, solar, and industrial rails without external pre-regulation. |
| Output Current | 500mA max continuous - sufficient for powering microcontrollers, sensors, and low-power SoCs in portable systems. |
| Output Voltage Options | Factory-set 1.8V/3.3V/5.0V or I²C-programmable 1.5V–7.5V in 50mV steps - enables flexible system-level voltage scaling without BOM changes. |
| Quiescent Current | 1.5μA (SUP only) / 19μA (IN1/IN2 powered) - sustains ultra-low-power always-on operation in battery-backed applications. |
| Power MUX On-Resistance | 250mΩ (typ) per channel - reduces conduction loss vs. Schottky diodes, enabling >90% efficiency at light loads with dual-source redundancy. |
| Package | 15-bump wafer-level package (WLP), 2.33mm × 1.42mm × 0.7mm - fits space-constrained designs such as wearables and compact IoT nodes. |
| Switching Frequency | 1MHz (±6% with spread spectrum) - allows use of small 10μH inductors and minimizes EMI through frequency dithering. |
Pinout & Package
MAX77756DEWL+T uses a 15-bump wafer-level package (WLP) with 0.4mm pitch, 3×5 bump array, and top-side bump layout (bump side down). Thermal resistance θJA = 61.65°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1 / IN2 | Dual-input power MUX channels | Independent 3V–24V input sources; MUX auto-selects higher voltage to SUP; connect to PGND to disable channel. |
| SUP | Power MUX output & buck input | Supplies buck converter; must be bypassed with 1μF ceramic cap; do not prebias if powered from IN1/IN2. |
| LX | Switching node | Connects to 10μH inductor; high-impedance when disabled; internal clamp diodes to PGND/SUP require current limiting. |
| OUT/FB | Output sense / feedback input | Internal feedback: direct VOUT sensing; external feedback: resistor divider input (1V–99% VSUP); avoid EMI-sensitive routing. |
| EN | Enable control | Logic-compatible with SUP domain; VEN_HI = 1.4V min; interacts with I²C EN_BIT for hybrid enable control. |
| POK | Open-drain Power OK | Asserts high when VOUT ≥ 90% VOUT-REG; requires external pullup; debounced with 12μs timer. |
| ILIM | Peak inductor current select | PGND = 700mA, BIAS = 1000mA; I²C writes accepted only when ILIM is logic-low. |
| SCL / SDA | I²C interface | Supports 1MHz clock; VIO-referenced logic (1.7V–5.5V); requires pullups to VIO; connect to PGND if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input ideal-diode MUX | Replaces discrete Schottky ORing arrays with 250mΩ P-FETs, eliminating forward-voltage drop and reducing thermal stress. |
| I²C programmable output | Adjusts VOUT from 1.5V to 7.5V in precise 50mV increments-enables dynamic voltage scaling and firmware-based rail tuning. |
| Ultra-low IQ standby mode | 1.5μA quiescent current with SUP active only-extends battery life in always-on backup rails and smart home hubs. |
| Hardware/software enable flexibility | EN pin (SUP-domain compatible) and I²C EN_BIT allow coordinated power sequencing in multi-rail systems. |
| Integrated safety protections | Hiccup-mode short-circuit response, thermal shutdown at +165°C, and soft-start ramp prevent inrush damage during startup. |
Applications
| USB Type-C Power Delivery Accessories | Notebook and Tablet Computers |
|---|---|
Use Scenario: Dual-source power management in USB-C docks supporting both host-powered and self-powered modes. IC Role / Device Role / Timing Role: Buck regulator + automatic ORing MUX selects between USB PD port and internal battery to maintain uninterrupted 3.3V system rail. Use Value: Eliminates need for external ideal diodes and discrete LDOs, reducing solution size by >40% and improving efficiency at 10–100mA loads. |
Use Scenario: Always-on auxiliary rail for keyboard backlight, touchpad, and sensor hub during suspend-to-RAM states. IC Role / Device Role / Timing Role: Low-IQ buck supplies stable 1.8V rail from either main battery or backup coin cell via MUX. Use Value: 1.5μA quiescent current extends suspend duration by >3× versus standard buck converters, preserving battery charge over weeks. |
| Home Automation Smart Hubs | Battery-Powered Backup Systems |
Use Scenario: Centralized power manager in Zigbee/Z-Wave hubs requiring reliable 3.3V rail from AC adapter or rechargeable Li-ion. IC Role / Device Role / Timing Role: Dual-input MUX ensures seamless switchover between primary and secondary sources without brownout or reset. Use Value: 400mV switchover hysteresis prevents oscillation during source transitions, ensuring glitch-free operation during AC outage events. |
Use Scenario: Uninterruptible power for real-time clocks, security sensors, and memory retention in industrial controllers. IC Role / Device Role / Timing Role: Regulates 5.0V output from backup supercapacitor or LiFePO₄ cell while maintaining <20μA total system IQ. Use Value: Factory-set 5.0V output with ±1.2% accuracy across -40°C to +85°C ensures RTC timing stability without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-input buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX77596EWA+T | No integrated power MUX; 500mA buck only; same 15-bump WLP package and I²C interface. | Requires external ideal-diode ORing circuit for dual-source support; increases BOM count and PCB area. | Select when dual-input MUX is unnecessary and cost/space optimization favors discrete ORing. |
| TPS63020DSJR | Buck-boost topology; 2.5V–5.5V input; no MUX; 3A output; 10-pin SON package. | Supports single-input wide-VIN but cannot autonomously select between two independent sources. | Select for battery-powered systems needing VIN < 3V support or higher current, where MUX functionality is handled externally. |
Compared with MAX77756DEWL+T, MAX77596EWA+T removes MUX complexity but adds design overhead for source selection, while TPS63020DSJR trades MUX capability for buck-boost flexibility and higher current-neither offers pin-compatible dual-input autonomy.
Availability
MAX77756DEWL+T is available at Aetrix Electronics and suitable for USB Type-C PD accessories, notebook auxiliary rails, and battery-backed smart home hubs requiring stable component supply, long-lifecycle assurance, and wafer-level packaging for miniaturized designs.
Supply support for MAX77756DEWL+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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, computing, and consumer applications.
The MAX77756DEWL+T belongs to Maxim's ultra-compact power MUX + buck family, engineered specifically for space-constrained, dual-source-powered portable electronics requiring zero-maintenance source arbitration and nanoscale footprint.
FAQ
What is the maximum input voltage rating for MAX77756DEWL+T?
The MAX77756DEWL+T supports absolute maximum input voltages of +26V on IN1 and IN2 relative to PGND, and +31V on BST relative to PGND. Its operational input range is 3.0V to 24V for reliable buck conversion. Exceeding 24V during normal operation risks violating the specified electrical characteristics and may trigger undervoltage lockout or thermal protection.
Can MAX77756DEWL+T operate with only one input source?
Yes, MAX77756DEWL+T can operate with a single input source by connecting the unused INx pin to PGND and powering SUP directly. This bypasses the MUX logic entirely, allowing the buck converter to function as a standard 3V–24V input regulator. The device retains all other features-including I²C control, POK, and low-IQ modes-in this configuration.
How does the MAX77756DEWL+T handle switchover between IN1 and IN2?
The MAX77756DEWL+T uses automatic switchover with 400mV hysteresis: the lower-voltage input channel turns off only after the higher-voltage channel rises by at least 400mV above it. This prevents chattering during near-equal voltage conditions. Switchover occurs dynamically while enabled and requires no software intervention-ensuring seamless transitions during source failures or plug/unplug events.
What is the purpose of the ILIM pin on MAX77756DEWL+T?
The ILIM pin on MAX77756DEWL+T sets the peak inductor current limit: grounding selects 700mA, connecting to BIAS selects 1000mA. This hardware configuration determines current-sense threshold before cycle-by-cycle shutdown. I²C writes to the ILIM register are only accepted when ILIM is logic-low-providing fail-safe current limiting even during firmware updates.
Does MAX77756DEWL+T support external feedback for custom output voltages?
Yes, MAX77756DEWL+T supports external feedback via the OUT/FB pin using a resistor divider. This configuration allows output voltages from 1V up to 99% of VSUP, extending beyond the 1.5V–7.5V I²C range. The datasheet specifies a 5.6pF feed-forward capacitor between output and FB to stabilize compensation-critical for maintaining phase margin with non-standard VOUT settings.
MAX77756DEWL+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX77756DEWL+T FAQ
1.How can I place an order for MAX77756DEWL+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77756DEWL+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 MAX77756DEWL+T reliable?
The price and inventory of MAX77756DEWL+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77756DEWL+T is usually 5 days.
3.What payment methods are accepted for MAX77756DEWL+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77756DEWL+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77756DEWL+T?
MAX77756DEWL+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77756DEWL+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 MAX77756DEWL+T?
For technical support, including MAX77756DEWL+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77756DEWL+T requirements.
6.How does Aetrix verify that MAX77756DEWL+T is sourced from the original manufacturer or authorized distributors?
All MAX77756DEWL+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 MAX77756DEWL+T meets industry standards.
7.What is the process for return or replacement of MAX77756DEWL+T?
All MAX77756DEWL+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77756DEWL+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 MAX77756DEWL+T part is unused and in its original packaging.
Return procedure for MAX77756DEWL+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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