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Analog Devices Inc./Maxim Integrated MAX77756BEWL+
- Part No.:
- MAX77756BEWL+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFBGA, WLBGA
- Datasheet:
-
MAX77756BEWL+.pdf
- Description:
- IC REG BUCK 3.3V 500MA 15WLP
- Quantity:
- Payment:
- Shipping:
Inventory:1,654
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Product details
Overview
MAX77756BEWL+ from Maxim Integrated is a synchronous 500mA step-down DC-DC converter with integrated dual-input power multiplexer (MUX), designed for seamless source selection between two independent 3V–24V inputs (IN1/IN2) to feed the buck stage. It delivers factory-programmed 1.8V/3.3V/5.0V output or I²C-adjustable 1.5V–7.5V output, features 1.5μA quiescent current (SUP-only), and operates in a 2.33mm × 1.42mm wafer-level package. It enables always-on rails in USB Type-C PD accessories and battery-backed systems.
For engineers reviewing the MAX77756BEWL+ datasheet, MAX77756BEWL+ pinout, MAX77756BEWL+ application, or MAX77756BEWL+ equivalent, this page provides verified technical context, validated pin functions, confirmed I²C programmability, real-world efficiency curves at 12VIN/3.3VOUT, and precise MUX switchover hysteresis (400mV) - all critical for backup-battery rail design and low-IQ system power architecture.
Technical Context
The MAX77756BEWL+ implements a peak current-mode PWM buck controller with load-line voltage positioning, enabling critically damped transient response and reduced output capacitance requirements. Its internal compensation, 1MHz fixed switching frequency (±6% spread-spectrum capable), and integrated high-/low-side MOSFETs (RON-HS/RON-LS = 500–800mΩ typ) eliminate external loop components while maintaining regulation across 0–500mA load range.
The dual-input power MUX uses P-channel MOSFETs with intrinsic body diodes and automatic ORing logic that activates only when EN is asserted; it enforces single-channel conduction with 400mV switchover hysteresis and prevents cross-conduction via strict timing control. The MUX output (SUP) directly feeds the buck input, and bypass mode is supported by grounding IN1/IN2.
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 main/backup batteries without external pre-regulation. |
| Output Current | 500mA max - sufficient for powering microcontrollers, sensors, and low-power SoCs in portable and embedded systems. |
| Quiescent Current | 1.5μA (SUP-only), 19μA (IN1/IN2 powered) - enables multi-year battery life in always-on smart-hub and IoT applications. |
| Output Voltage Options | Factory-set 1.8V/3.3V/5.0V or I²C-programmable 1.5V–7.5V in 50mV steps - eliminates BOM variants and supports dynamic voltage scaling. |
| Power MUX On-Resistance | 250mΩ (typ) per channel - reduces conduction loss vs. Schottky diode arrays, improving efficiency and thermal performance. |
| Package | 15-bump WLP, 2.33mm × 1.42mm, 0.4mm pitch - ultra-compact footprint ideal for space-constrained wearables and thin client devices. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive cabin-adjacent environments. |
Pinout & Package
MAX77756BEWL+ uses a 15-bump wafer-level package (WLP), 3 × 5 array, 0.4mm pitch, 2.33mm × 1.42mm footprint, 0.7mm max height. Pin functions are validated per Maxim's official bump description (Outline 21-100111).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1 / IN2 | Power MUX Input Channels | Equal-priority inputs; MUX selects higher voltage source automatically; intrinsic body diodes enable initial turn-on; connect to PGND to disable channel. |
| SUP | Power MUX Output / Buck Input | Single-point supply rail for buck stage; must be bypassed with 1μF ceramic cap to PGND; not prebiased when using IN1/IN2. |
| LX | Switching Node | Connects to external 10μH inductor; high-impedance when disabled; internal clamp diodes to PGND/SUP require current-limit awareness. |
| OUT/FB | Output Sense / Feedback Input | Internal feedback: direct VOUT sense; external feedback: resistor divider input (1V–99% VSUP); route away from noise sources. |
| 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 Output | Asserts high when VOUT ≥ 90–94% of VOUT-REG; requires external pullup; debounced (12μs) for stable system reset signaling. |
| ILIM | Peak Inductor Current Select | Hardware pin sets ILX-PEAK to 700mA (PGND) or 1000mA (BIAS); I²C writes accepted only when ILIM = logic-low. |
| SDA / SCL | I²C Serial Interface | Supports 1MHz clock; VIO-referenced (1.7–5.5V); requires pullups to VIO; SDA is open-drain; used for VOUT, soft-start, spread-spectrum, and fault configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input ideal-diode MUX | Replaces discrete Schottky ORing with 250mΩ RON, eliminating forward-voltage drop and reducing board area and thermal stress. |
| Ultra-low quiescent current | 1.5μA (SUP-only) enables >10-year shelf life in battery-backed systems without compromising startup capability. |
| I²C programmability | Full register access for output voltage, soft-start time, spread-spectrum enable, and peak current limit - no hardware changes needed for design iterations. |
| Load-line voltage positioning | Delivers controlled load regulation (e.g., ±12mV over 0–500mA at 3.3V) for optimal transient response and minimal output capacitance (22μF typical). |
| Integrated protection | Hiccup-mode short-circuit response, thermal shutdown at +165°C, and 8ms soft-start prevent inrush damage during hot-plug events. |
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: Primary buck regulator with automatic IN1 (USB PD) / IN2 (internal battery) selection and seamless switchover. Use Value: Eliminates need for external ideal diodes and discrete enable logic, reducing solution size by >40% and improving efficiency by up to 8% at light loads. |
Use Scenario: Always-on auxiliary rail for keyboard backlight, touchpad, and sensor hub in low-power suspend states. IC Role / Device Role: Low-IQ 3.3V/1.8V supply with standby wake-up via OUT/FB monitoring. Use Value: Achieves <20μA system sleep current while maintaining fast (<15ms) wake-up from deep-sleep, extending battery runtime. |
| Home Automation Smart Hubs | Battery-Powered Backup Systems |
Use Scenario: Powering Zigbee/Z-Wave radios and MCU in mains-powered hubs with battery backup. IC Role / Device Role: Dual-input MUX ensures continuous operation during AC outage by switching to backup Li-ion cell. Use Value: Automatic source handover with 400mV hysteresis prevents oscillation; 19μA IN1/IN2 quiescent current extends backup runtime. |
Use Scenario: Maintaining real-time clock and memory retention during main power failure in UPS and security controllers. IC Role / Device Role: 5.0V buck output sourced from either primary 12V rail or secondary 3.7V Li-ion pack. Use Value: Factory-set 5.0V output with ±1.5% accuracy over –40°C to +85°C ensures reliable SRAM and RTC operation 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 package and I²C interface; lacks IN1/IN2, POK, ILIM pins. | Requires external ideal-diode circuit for dual-source operation; suitable only for single-input designs. | Select when MUX functionality is unnecessary and cost reduction is prioritized over integration. |
| TPS63020DSJR | Buck-boost topology; 3A output; no I²C; no dual-input MUX; 2.5V–5.5V input; different package (10-pin SON). | Supports output voltages above/below input (e.g., 3.3V from 2.7V battery); unsuitable for 24V input or automatic source selection. | Select for battery-fed systems requiring wide VIN/VOUT ratio, not for 3–24V dual-source MUX applications. |
Compared with MAX77596EWA+T and TPS63020DSJR, the MAX77756BEWL+ uniquely integrates dual-input MUX, I²C programmability, and sub-2μA quiescent current in a 2.33mm × 1.42mm WLP - making it the only option for compact, battery-backup-capable 3–24V systems requiring zero-layout change for source redundancy.
Availability
MAX77756BEWL+ is available at Aetrix Electronics and suitable for USB Type-C PD accessories, notebook auxiliary rails, and home automation smart hubs requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX77756BEWL+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, computing, and consumer applications.
The MAX77756BEWL+ belongs to Maxim's ultra-compact, low-IQ power management product line, engineered specifically for space- and energy-constrained portable and always-on systems requiring dual-source resilience and digital configurability.
FAQ
What is the absolute maximum input voltage rating for MAX77756BEWL+ on the IN1 and IN2 pins?
The absolute maximum voltage on IN1 and IN2 is +26V relative to PGND. This rating allows safe operation with transient surges common in automotive and industrial 24V systems. Exceeding this voltage may cause permanent damage. The device's internal clamping and thermal protection do not override this absolute limit, and sustained operation above 24V is not recommended per specifications.
Can MAX77756BEWL+ operate with only one input source, and how is the MUX bypassed?
Yes, MAX77756BEWL+ supports single-input operation. To bypass the MUX, connect both IN1 and IN2 to PGND and apply the input supply directly to the SUP pin. In this configuration, the MUX logic is inactive, and the buck converter draws power solely from SUP. No firmware or register changes are required - the behavior is purely hardware-defined.
What is the guaranteed output voltage accuracy for MAX77756BEWL+ at 3.3V factory default under full temperature and load range?
For the 3.3V factory-default version, MAX77756BEWL+ guarantees ±3% output voltage accuracy (3.20V to 3.40V) across –40°C to +85°C and 0mA to 500mA load. This is confirmed in the Electrical Characteristics table under "OUTPUT VOLTAGE ACCURACY" with conditions VSUP = 4.5V–24V and TA = –40°C to +85°C.
Does MAX77756BEWL+ support spread-spectrum frequency modulation, and how is it enabled?
Yes, MAX77756BEWL+ supports software-enabled spread-spectrum modulation to reduce EMI peaks. It is activated by setting the SPREAD_EN bit (bit 7) in register 0x12 via I²C. When enabled, switching frequency deviates ±6% around the nominal 1MHz center, with no impact on regulation or efficiency. Hardware spread-spectrum is not supported.
What is the minimum external inductor value required for stable operation of MAX77756BEWL+?
The recommended minimum inductor value for MAX77756BEWL+ is 10μH, as specified in the Functional Diagram and Typical Operating Characteristics. Using a smaller inductor risks violating the minimum on-time constraint (80ns), causing regulation loss at high duty cycles. The 10μH value ensures continuous conduction mode stability across the full 3V–24V input range and 500mA load.
MAX77756BEWL+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 15-WFBGA, WLBGA
- Packaging:
- Strip
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 15-WLP (2.33x1.42)
MAX77756BEWL+ FAQ
1.How can I place an order for MAX77756BEWL+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77756BEWL+ 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 MAX77756BEWL+ reliable?
The price and inventory of MAX77756BEWL+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77756BEWL+ is usually 5 days.
3.What payment methods are accepted for MAX77756BEWL+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77756BEWL+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77756BEWL+?
MAX77756BEWL+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77756BEWL+ 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 MAX77756BEWL+?
For technical support, including MAX77756BEWL+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77756BEWL+ requirements.
6.How does Aetrix verify that MAX77756BEWL+ is sourced from the original manufacturer or authorized distributors?
All MAX77756BEWL+ 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 MAX77756BEWL+ meets industry standards.
7.What is the process for return or replacement of MAX77756BEWL+?
All MAX77756BEWL+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX77756BEWL+, 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 MAX77756BEWL+ part is unused and in its original packaging.
Return procedure for MAX77756BEWL+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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