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Analog Devices Inc./Maxim Integrated MAX77756CEWL+T
- Part No.:
- MAX77756CEWL+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX77756CEWL+T.pdf
- Description:
- IC REG BUCK WIDE INPUT VOLTAGE
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Inventory:4,570
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Product details
Overview
MAX77756CEWL+T from Maxim Integrated is a synchronous 500mA step-down DC-DC converter with integrated dual-input power multiplexer (MUX), operating from 3.0V to 24V input. It delivers factory-programmed output voltages of 1.8V, 3.3V, or 5.0V - adjustable via I²C (1.5V–7.5V in 50mV steps) or external resistors - and targets USB Type-C PD accessories, battery-backed smart hubs, and notebook auxiliary rails.
For engineers reviewing the MAX77756CEWL+T datasheet, MAX77756CEWL+T pinout, MAX77756CEWL+T application, or MAX77756CEWL+T equivalent, key selection criteria include its 15-bump WLP package, dual-input ORing capability with 250mΩ MUX FETs, 1.5μA quiescent current (SUP-only), I²C programmability, and integrated thermal/short-circuit protection.
Technical Context
The MAX77756CEWL+T integrates a peak-current-mode synchronous buck regulator with a dual-channel ideal-diode MUX. Its control architecture includes slope-compensated PWM, load-line voltage positioning for transient response optimization, and SKIP mode with standby entry at ultra-light loads (VOUT monitored by low-power comparator).
Power MUX logic selects the higher of IN1 or IN2 (with 400mV switchover hysteresis), enabling automatic source redundancy without cross-conduction. The MUX operates only when EN is asserted; both channels disable during shutdown. SUP serves as both MUX output and buck input, while BIAS powers internal circuitry via an integrated LDO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 24V - supports wide-source applications including USB PD, solar, and dual-battery systems. |
| Output Current | 500mA max - sufficient for powering microcontrollers, sensors, and low-power peripherals in space-constrained designs. |
| Output Voltage Options | Factory-set 1.8V/3.3V/5.0V or I²C-programmable 1.5V–7.5V (50mV steps) - enables flexible rail generation without resistor changes. |
| Quiescent Current | 1.5μA (SUP-only), 19μA (IN1/IN2 powered) - sustains always-on operation in battery-backed systems for months. |
| Switching Frequency | 1MHz typical - allows use of small 10μH inductors and compact ceramic output capacitors (≥22μF). |
| Package | 15-bump wafer-level package (WLP), 2.33mm × 1.42mm × 0.7mm - optimized for ultra-thin portable and wearable electronics. |
| Thermal Protection | 165°C junction shutdown with 15°C hysteresis - prevents damage during sustained overload or poor PCB thermal design. |
Pinout & Package
MAX77756CEWL+T uses a 15-bump wafer-level package (WLP) with 0.4mm pitch in a 3×5 array (outline 21-100111, land pattern 90-100052). Bump-side-down top view with A1–C5 labeling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | IN1 | Primary MUX input; diode-connected to SUP; tied to PGND to force channel off. |
| C1 | IN2 | Secondary MUX input; identical priority to IN1; same diode connection and disable method. |
| A3 | BST | Bootstrap supply for high-side FET driver; requires 0.1μF capacitor to LX. |
| A2 | SUP | MUX output & buck input; bypass with 1μF ceramic cap to PGND; must not be prebiased if powered from IN1/IN2. |
| A4 | LX | Switching node; high-impedance when disabled; connects to 10μH inductor. |
| A5 | PGND | Power ground return for SUP/OUT capacitors and LX path; connected to AGND on PCB. |
| B4 | AGND | Quiet analog ground; return for BIAS capacitor; must be shorted to PGND on board. |
| C5 | POK | Open-drain Power-OK signal; requires external pullup; asserts high when VOUT ≥90% of target. |
| C3 | BIAS | Internal LDO output (5V); powers IC core; bypass with 1μF cap to AGND; no external loading. |
| B5 | OUT/FB | Output sense (internal FB) or feedback input (external FB); sets regulation point; routed away from noise sources. |
| B3 | EN | Hardware enable; logic-high (>1.4V) activates both MUX and buck; compatible with SUP voltage domain. |
| B1 | VIO | I²C interface supply; connect to PGND if unused; defines SDA/SCL logic thresholds. |
| C2 | SCL | I²C clock input; requires pullup to VIO; inactive when VIO = PGND. |
| B2 | SDA | I²C data bidirectional line; requires pullup to VIO; supports standard-mode (1MHz) timing. |
| C4 | ILIM | Peak inductor current select: PGND = 700mA, BIAS = 1000mA; I²C writes accepted only when ILIM = low. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input ideal-diode MUX | Replaces lossy Schottky ORing arrays with 250mΩ P-FETs, reducing conduction loss and solution size. |
| Ultra-low IQ standby mode | 1.5μA quiescent current (SUP-only) extends battery life in always-on IoT and backup-rail applications. |
| I²C programmable output | Enables dynamic voltage scaling and firmware-controlled rail tuning without hardware modification. |
| Load-line voltage positioning | Optimizes transient response and reduces required output capacitance by allowing controlled load regulation. |
| Integrated thermal & hiccup protection | Prevents catastrophic failure during overloads: thermal shutdown at 165°C + 15°C hysteresis, short-circuit hiccup mode. |
| Pin-programmable current limit | ILIM pin selects 700mA/1000mA peak inductor current - simplifies inductor selection across load profiles. |
Applications
| USB Type-C Power Delivery Accessories | Notebook & Tablet Auxiliary Rails |
|---|---|
|
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 upstream PD port and local battery/solar input. Use Value: Eliminates need for discrete ideal diodes and external buck controller, reducing BOM count and PCB area by >40%. |
Use Scenario: Always-on subsystem rail (e.g., keyboard controller, touchpad, sensor hub) during suspend-to-RAM. IC Role / Device Role / Timing Role: Ultra-low-IQ buck supplies stable 3.3V from main battery or backup coin cell. Use Value: 1.5μA quiescent current enables multi-month standby without compromising wake-up latency or rail stability. |
| Home Automation Smart Hubs | Backup Battery Systems |
|
Use Scenario: Low-power gateway managing Zigbee/Z-Wave radios, BLE coexistence, and environmental sensors. IC Role / Device Role / Timing Role: Primary 1.8V/3.3V rail generator with I²C-adjustable voltage for optimizing radio PA efficiency. Use Value: I²C programmability allows runtime adaptation to different RF modules without hardware revision. |
Use Scenario: Seamless failover between primary Li-ion and secondary LiFePO₄ backup in industrial controllers. IC Role / Device Role / Timing Role: Dual-input MUX ensures uninterrupted 5.0V supply to MCU and RTC during main rail brownout. Use Value: 400mV MUX hysteresis prevents oscillation during marginal input transitions, ensuring clean switchover. |
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. | Single-input applications where ORing is handled externally or unnecessary. | Select when MUX functionality is redundant and cost/BOM minimization is prioritized. |
| TPS63802DLAR | Buck-boost topology (2.5V–12V input, 1.8V–5.5V output); no MUX; 2.0mm × 2.0mm QFN-11 package. | Applications requiring regulation during input voltage droop below 3.0V (e.g., single-cell Li-ion discharge). | Choose when input can fall below 3.0V and bidirectional voltage conversion is needed instead of ORing. |
Compared with MAX77756CEWL+T, MAX77596EWA+T removes MUX complexity but loses source redundancy, while TPS63802DLAR trades MUX capability for buck-boost flexibility and wider VIN range - neither offers pin compatibility or identical feature set.
Availability
MAX77756CEWL+T is available at Aetrix Electronics and suitable for USB Type-C PD accessories, notebook auxiliary rails, and battery-backed smart hubs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX77756CEWL+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, automotive, and computing applications.
The MAX77756CEWL+T belongs to Maxim's ultra-compact power management portfolio targeting space- and power-constrained portable electronics, with emphasis on dual-source resilience and firmware-configurable regulation.
FAQ
What is the maximum input voltage rating for MAX77756CEWL+T?
The MAX77756CEWL+T supports an absolute maximum input voltage of +26V on IN1 and IN2 pins relative to PGND, and +31V on BST relative to PGND. Its operational input range is 3.0V to 24V for reliable buck regulation. Exceeding these limits risks permanent damage per the Absolute Maximum Ratings table.
Can MAX77756CEWL+T operate with only one input source?
Yes. MAX77756CEWL+T supports single-input operation: tie IN1 and IN2 to PGND and power the device directly through the SUP pin. In this configuration, the internal MUX is bypassed, and the buck converter functions as a standard 3V–24V input, 500mA synchronous regulator.
How does the MAX77756CEWL+T handle switchover between IN1 and IN2?
The MAX77756CEWL+T implements automatic switchover with 400mV hysteresis: the lower-voltage input channel turns off only after the higher-voltage channel rises by ≥400mV above it. This prevents oscillation during near-equal input conditions and ensures stable, chatter-free transitions while the device is enabled.
What is the purpose of the ILIM pin on MAX77756CEWL+T?
The ILIM pin on MAX77756CEWL+T selects peak inductor current limit: grounding sets 700mA, connecting to BIAS sets 1000mA. This allows hardware-based inductor sizing for different load profiles. I²C writes to current-limit registers are only accepted when ILIM is logic-low, enforcing safe configuration sequencing.
Does MAX77756CEWL+T support spread-spectrum switching?
Yes. MAX77756CEWL+T includes software-enabled spread-spectrum modulation with ±6% frequency deviation around its nominal 1MHz switching frequency. This feature reduces EMI peak emissions, easing compliance with CISPR-22/32 Class B radiated emission requirements in compact layouts.
MAX77756CEWL+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:
- -
MAX77756CEWL+T FAQ
1.How can I place an order for MAX77756CEWL+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77756CEWL+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 MAX77756CEWL+T reliable?
The price and inventory of MAX77756CEWL+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77756CEWL+T is usually 5 days.
3.What payment methods are accepted for MAX77756CEWL+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77756CEWL+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77756CEWL+T?
MAX77756CEWL+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77756CEWL+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 MAX77756CEWL+T?
For technical support, including MAX77756CEWL+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77756CEWL+T requirements.
6.How does Aetrix verify that MAX77756CEWL+T is sourced from the original manufacturer or authorized distributors?
All MAX77756CEWL+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 MAX77756CEWL+T meets industry standards.
7.What is the process for return or replacement of MAX77756CEWL+T?
All MAX77756CEWL+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77756CEWL+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 MAX77756CEWL+T part is unused and in its original packaging.
Return procedure for MAX77756CEWL+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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