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Analog Devices Inc./Maxim Integrated MAX77756AEWL+T
- Part No.:
- MAX77756AEWL+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX77756AEWL+T.pdf
- Description:
- IC REG BUCK WIDE INPUT VOLTAGE
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Product details
Overview
MAX77756AEWL+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-set 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 supplies-e.g., main battery and backup battery-in USB Type-C PD accessories and always-on smart hubs.
For engineers reviewing the MAX77756AEWL+T datasheet, MAX77756AEWL+T pinout, MAX77756AEWL+T application, or MAX77756AEWL+T equivalent, key selection criteria include dual-input MUX behavior, I²C-programmable output voltage, 15-bump WLP package constraints, and low-IQ operation for battery-backed rails.
Technical Context
The device implements a peak-current-mode PWM buck regulator with fixed 1MHz switching frequency (±6% spread-spectrum enabled), internal slope compensation, and load-line voltage positioning architecture. Its dual-input MUX uses P-channel MOSFETs with 250mΩ on-resistance and 400mV switchover hysteresis to autonomously select the higher of IN1 or IN2 while preventing cross-conduction.
Control logic integrates hardware enable (EN), I²C interface (SCL/SDA at up to 1MHz), programmable peak inductor current (700–1000mA via ILIM pin), and soft-start (8ms). The BIAS LDO powers internal circuitry, and POK provides open-drain power-good signaling with 90–94% rising threshold relative to 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 cells, and industrial rails |
| Output Current | 500mA max - sufficient for powering microcontrollers, sensors, and low-power peripherals |
| Output Voltage Options | Factory-set 1.8V/3.3V/5.0V; I²C-adjustable 1.5V–7.5V in 50mV steps - enables flexible rail generation without external resistors |
| Quiescent Current | 1.5μA (SUP only) / 19μA (IN1/IN2 powered) - sustains ultra-low-power always-on operation in battery systems |
| Package | 15-bump wafer-level package (WLP), 2.33mm × 1.42mm × 0.7mm - ultra-compact footprint for space-constrained portable designs |
| Power MUX On-Resistance | 250mΩ (IN1/IN2 to SUP) - reduces conduction loss vs. Schottky diode ORing by >50% |
| Efficiency | 88% peak (12VIN, 3.3VOUT) - maintains high conversion efficiency across light-to-full load |
Pinout & Package
MAX77756AEWL+T is housed in a 15-bump wafer-level package (WLP) with 0.4mm pitch and 3×5 bump array (outline 21-100111). The package is bottom-side bumped; top-side markings align with standard WLP orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1 / IN2 | Dual-input power MUX channels | Independent 3V–24V inputs; MUX selects higher voltage to feed SUP; both have equal priority and intrinsic body diodes |
| SUP | Power MUX output & buck input | Supplies buck converter; must be bypassed with 1μF ceramic cap; not prebiased when using IN1/IN2 |
| LX | Switching node | Connects to external 10μH inductor; high-impedance when disabled; internal clamp diodes to PGND/SUP |
| OUT/FB | Output sense / feedback input | Internal feedback: direct output sensing; external feedback: resistor divider input (1V–99% VSUP) |
| PGND / AGND | Power / analog ground | PGND carries high-current return paths; AGND is quiet reference for BIAS and FB; must be connected on PCB |
| BST | High-side gate driver supply | Requires 0.1μF ceramic capacitor to LX; enables efficient high-side FET drive |
| EN | Enable control | Logic-compatible with SUP domain; drives low to disable; interacts with I²C EN_BIT for combined control |
| POK | Open-drain power-good output | Asserts high when VOUT ≥ 90% of VOUT-REG; requires external pullup; debounced 12μs |
| ILIM | Peak inductor current select | PGND = 700mA, BIAS = 1000mA; I²C writes accepted only when ILIM is logic-low |
| VIO / SDA / SCL | I²C interface supply & signals | VIO sets logic thresholds (1.7–5.5V); SDA/SCL require pullups to VIO; support 1MHz clock |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input ideal-diode MUX | Replaces discrete Schottky ORing with 250mΩ P-FETs, eliminating forward-voltage drop and reducing thermal stress |
| I²C-programmable output | Enables dynamic voltage scaling (1.5V–7.5V, 50mV steps) without changing BOM or layout-critical for adaptive power management |
| Ultra-low quiescent current | 1.5μA (SUP-only) extends battery life in always-on applications such as smart home hubs and backup rails |
| Load-line voltage positioning | Delivers critically damped transient response and reduces required output capacitance by up to 30% vs. classical integrator-based controllers |
| Integrated BIAS LDO | Provides stable 5V internal supply from VSUP (5.5V–24V), eliminating need for external bias rail and simplifying system design |
Applications
| USB Type-C Power Delivery Accessories | Notebook and Tablet Computers |
|---|---|
Use Scenario: Dual-source power management in USB-C PD adapters and docks that accept input from either host port or external adapter. IC Role / Device Role / Timing Role: Acts as primary buck regulator and automatic input selector-accepting 5V/9V/15V/20V PD inputs and delivering stable 3.3V or 5.0V system rail. Use Value: Eliminates need for external ideal-diode controllers and discrete buck ICs, reducing solution size by >40% and BOM count by 3–5 components. | Use Scenario: Always-on auxiliary rail generation for embedded controllers, touch controllers, and sensor subsystems during suspend-to-RAM states. IC Role / Device Role / Timing Role: Provides low-noise, low-IQ 1.8V or 3.3V supply with fast wake-up (<15ms) from standby mode upon POK assertion. Use Value: Achieves <2μA system sleep current contribution while maintaining regulated output-enabling multi-week battery hold-up time. |
| Home Automation Smart Hubs | Battery-Powered Backup Systems |
Use Scenario: Centralized power management in Zigbee/Z-Wave hubs requiring simultaneous operation from AC adapter and coin-cell backup. IC Role / Device Role / Timing Role: Seamlessly switches between wall adapter (IN1) and backup battery (IN2) without brownout; regulates 3.3V rail with ±1% accuracy over temperature. Use Value: Prevents firmware corruption during AC loss by maintaining uninterrupted 3.3V supply with <100ns switchover latency. | Use Scenario: Uninterruptible power delivery in security cameras or IoT gateways where main Li-ion and supercapacitor backup coexist. IC Role / Device Role / Timing Role: Selects higher-voltage source (e.g., 4.2V battery vs. 3.6V supercap) to feed buck; supports soft-start and hiccup-mode short-circuit protection. Use Value: Enables >99.9% uptime with no manual intervention; thermal shutdown at +165°C prevents field failures under overload. |
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; single-input buck only; same 3V–24V input, 500mA output, and WLP package | Requires external ideal-diode ORing for dual-source apps; simpler control but higher total solution cost and area | Select when dual-input selection is unnecessary and board space allows discrete MUX implementation |
| TPS63802DLAR | Single-input buck-boost (2.5V–12V input, 1.8V–5.5V output); no MUX; 2A output; 2.5mm × 2.5mm QFN | Supports buck-boost topology for wider VIN/VOUT ratios; lacks automatic source selection and ultra-low IQ | Select when input voltage may fall below output (e.g., Li-ion discharge) and dual-source redundancy is handled externally |
Compared with MAX77596EWA+T and TPS63802DLAR, MAX77756AEWL+T uniquely integrates dual-input MUX functionality with sub-2μA quiescent current-making it the only option that simultaneously minimizes solution size, eliminates external ORing components, and guarantees nanosecond-scale switchover in battery-backup systems.
Availability
MAX77756AEWL+T is available at Aetrix Electronics and suitable for USB Type-C PD accessories, notebook auxiliary rails, and battery-powered smart hubs requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX77756AEWL+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 MAX77756 belongs to Maxim's ultra-compact power-management portfolio targeting space- and power-constrained portable electronics; it was engineered specifically to replace discrete dual-source ORing + buck solutions in USB-C, smart home, and always-on edge devices.
FAQ
What is the absolute maximum input voltage rating for MAX77756AEWL+T?
The MAX77756AEWL+T has an absolute maximum input rating of +26V on IN1 and IN2 pins relative to PGND. Exceeding this voltage-even momentarily-may cause permanent damage. The recommended operating range remains 3.0V to 24V for reliable long-term performance per the datasheet specifications.
Can MAX77756AEWL+T operate with only one input source?
Yes. MAX77756AEWL+T supports single-input operation: connect the unused IN pin (IN1 or IN2) to PGND and power the SUP pin directly from the active source. This bypasses the MUX logic entirely and routes input power straight to the buck converter, preserving full 500mA output capability and efficiency.
How does the ILIM pin affect MAX77756AEWL+T current limiting?
The ILIM pin sets the peak inductor current limit for MAX77756AEWL+T: grounding ILIM configures 700mA, connecting to BIAS sets 1000mA. I²C register writes to current limit are only accepted when ILIM is logic-low. This dual-control method ensures robust overcurrent protection while allowing runtime adjustment where needed.
What is the purpose of the BIAS pin on MAX77756AEWL+T?
The BIAS pin on MAX77756AEWL+T outputs a regulated 5V supply derived from VSUP (5.5V–24V), used internally to power control circuitry and optionally to bias external components. It must be bypassed with a 1μF ceramic capacitor to AGND and should not be loaded beyond 1mA to maintain regulation accuracy and stability.
Does MAX77756AEWL+T support forced PWM (FPWM) mode?
No. MAX77756AEWL+T does not support user-configurable forced PWM mode. It operates in automatic SKIP mode with optional standby entry at light loads. FPWM is referenced only as an internal test mode in the datasheet and is not accessible or controllable via EN, I²C, or any other pin.
MAX77756AEWL+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:
- -
MAX77756AEWL+T FAQ
1.How can I place an order for MAX77756AEWL+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77756AEWL+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 MAX77756AEWL+T reliable?
The price and inventory of MAX77756AEWL+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77756AEWL+T is usually 5 days.
3.What payment methods are accepted for MAX77756AEWL+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77756AEWL+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77756AEWL+T?
MAX77756AEWL+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77756AEWL+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 MAX77756AEWL+T?
For technical support, including MAX77756AEWL+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77756AEWL+T requirements.
6.How does Aetrix verify that MAX77756AEWL+T is sourced from the original manufacturer or authorized distributors?
All MAX77756AEWL+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 MAX77756AEWL+T meets industry standards.
7.What is the process for return or replacement of MAX77756AEWL+T?
All MAX77756AEWL+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77756AEWL+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 MAX77756AEWL+T part is unused and in its original packaging.
Return procedure for MAX77756AEWL+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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