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Analog Devices Inc./Maxim Integrated MAX77756BEWL+T
- Part No.:
- MAX77756BEWL+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 15-WFBGA, WLBGA
- Datasheet:
-
MAX77756BEWL+T.pdf
- Description:
- IC REG BUCK 3.3V 500MA 15WLP
- Quantity:
- Payment:
- Shipping:
Inventory:4,185
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Product details
Overview
MAX77756BEWL+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 from 1.5V to 7.5V in 50mV steps) and features 1.5μA quiescent current in SUP-only mode. It enables seamless source selection between main and backup batteries in USB PD accessories and always-on smart hubs.
For engineers reviewing the MAX77756BEWL+T datasheet, MAX77756BEWL+T pinout, MAX77756BEWL+T application, or MAX77756BEWL+T equivalent, key selection considerations include its 15-bump WLP package, dual-input MUX behavior with 250mΩ on-resistance, I²C programmability, soft-start timing, and thermal shutdown at +165°C - all critical for battery-backed, space-constrained embedded power rails.
Technical Context
The MAX77756BEWL+T integrates a peak-current-mode synchronous buck regulator with a dual-channel ideal-diode ORing MUX. Its control architecture includes slope-compensated PWM, load-line voltage positioning, and SKIP/standby modes to maintain high light-load efficiency. The MUX logic automatically selects the higher of IN1 or IN2 (with 400mV switchover hysteresis) while enforcing single-channel conduction to prevent cross-conduction.
It supports both internal feedback (factory-set VOUT) and external resistor programming (1V to 99% VSUP), with I²C interface (1MHz max SCL) enabling dynamic voltage scaling. The BIAS LDO powers internal circuitry, and ILIM pin allows hardware-selectable peak inductor current limits (700mA–1000mA).
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 multi-cell batteries without external pre-regulation. |
| Output Current | 500mA max continuous - sufficient for low-power microcontrollers, sensors, and RF modules in portable systems. |
| Quiescent Current | 1.5μA (SUP only) / 19μA (IN1/IN2 powered) - enables multi-year battery life in always-on backup rails and IoT edge nodes. |
| Output Voltage Options | Factory-set 1.8V/3.3V/5.0V; adjustable via I²C (1.5V–7.5V, 50mV steps) or external resistors - simplifies BOM across product variants. |
| Switching Frequency | 1MHz typical (0.94–1.06MHz) - allows compact 10μH inductors and minimizes EMI in noise-sensitive applications. |
| Power MUX On-Resistance | 250mΩ (typ) per channel - reduces forward drop vs. Schottky diodes, improving efficiency and thermal performance in ORing paths. |
| Package | 2.33mm × 1.42mm, 15-bump WLP (0.4mm pitch, 3×5 array) - ultra-small footprint for space-constrained wearables and modular accessories. |
Pinout & Package
MAX77756BEWL+T uses a 2.33mm × 1.42mm, 15-bump wafer-level package (WLP) with 0.4mm pitch and 3×5 bump array. The package is specified as W151G2+1 (Outline 21-100111) and requires land pattern 90-100052 per Application Note 1891.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1 | Power MUX Input 1 | Primary input source (e.g., main battery); diode-connected to SUP; connect to PGND to disable channel. |
| IN2 | Power MUX Input 2 | Secondary input source (e.g., backup battery or USB PD); equal priority to IN1; automatic ORing selection logic active when EN = high. |
| SUP | MUX Output / Buck Input | Supplies buck converter; bypass with 1μF ceramic cap to PGND; do not prebias if powered from IN1/IN2. |
| LX | Switching Node | Connects to inductor; high-impedance when disabled; internal clamp diodes to PGND and SUP limit voltage stress. |
| OUT/FB | Output Sense / Feedback Input | Internal feedback: direct VOUT sense; external feedback: resistor divider input (1V–99% VSUP range). |
| PGND | Power Ground | Main return path for high-current loops (SUP, OUT, LX); must be connected to AGND on PCB. |
| AGND | Quiet Analog Ground | Reference for BIAS, FB, and analog circuits; tie to PGND at single point near IC. |
| EN | Enable Input | Logic-compatible with SUP domain; >1.4V enables both MUX and buck; <0.4V disables entire device. |
| POK | Open-Drain Power OK | Asserts low when VOUT is within ±2% of regulation (90–94% rising, 88–92% falling threshold); requires external pullup. |
| ILIM | Peak Inductor Current Select | Hardware-configurable: PGND = 700mA, BIAS = 1000mA; overrides I²C setting when high. |
| SDA/SCL | I²C Data/Clock | Supports 1MHz operation; require pullups to VIO; VIO range 1.7V–5.5V; used for dynamic VOUT adjustment and status reads. |
| VIO | I²C Interface Supply | Separate rail for I²C logic; connect to PGND if interface unused; decoupling not required but recommended. |
| BST | Bootstrap Supply | Connect 0.1μF ceramic capacitor between BST and LX to drive high-side MOSFET gate. |
| BIAS | Internal LDO Output | 5V regulated supply for internal circuitry; bypass with 1μF ceramic cap to AGND; do not load externally. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-input ideal-diode MUX | Replaces discrete Schottky ORing arrays with 250mΩ MOSFETs, reducing forward voltage drop by >60% and eliminating thermal runaway risk. |
| Ultra-low IQ standby mode | 1.5μA quiescent current (SUP only) extends battery life in always-on backup rails without sacrificing wake-up responsiveness. |
| Load-line voltage positioning | Delivers critically damped transient response by intentionally offsetting VOUT vs. load - reduces required output capacitance by up to 40%. |
| Hardware/software enable flexibility | EN pin operates in SUP domain; I²C EN_BIT allows host-controlled sequencing - supports complex power-up/down sequences in multi-rail systems. |
| Configurable peak current limit | ILIM pin selects 700mA/1000mA inductor current limit - enables optimization for small inductors (low DCR) or high-reliability designs (derated current). |
| Integrated thermal protection | Thermal shutdown at +165°C with +15°C hysteresis prevents damage during sustained overload or poor PCB thermal design. |
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: Primary buck regulator with automatic IN1 (USB PD) / IN2 (internal battery) selection and precise 3.3V/5.0V output regulation. Use Value: Eliminates need for external ideal diodes and discrete regulators, reducing solution size by 35% and improving efficiency by 8% at 100mA load. |
Use Scenario: Always-on auxiliary rail for keyboard backlight, touch controller, and sensor hub during S0ix sleep states. IC Role / Device Role / Timing Role: Low-IQ buck supplying 1.8V to always-on logic with fast wake-up (<10ms) from standby mode. Use Value: Achieves 1.5μA quiescent current in SUP-only mode, extending battery runtime by 2.1 hours per charge cycle in idle state. |
| Home Automation Smart Hubs | Battery-Powered Backup Systems |
|
Use Scenario: Multi-sensor aggregation node powered by primary Li-ion and secondary supercapacitor backup. IC Role / Device Role / Timing Role: Dual-input MUX + buck delivering stable 3.3V to MCU and radios, with seamless switchover during main power loss. Use Value: 400mV MUX hysteresis prevents oscillation during brownout; POK signal triggers host firmware failover within 12μs. |
Use Scenario: Uninterruptible 5.0V rail for industrial PLC I/O modules during AC mains failure. IC Role / Device Role / Timing Role: High-voltage-capable (24V) buck with IN1 (AC adapter) / IN2 (backup LiFePO₄) selection and hiccup-mode short-circuit protection. Use Value: Supports 24V input directly - avoids cascaded conversion losses; hiccup mode limits fault energy to <50mJ during sustained short. |
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 2.33mm × 1.42mm WLP package and I²C interface. | Requires external ideal-diode ORing for dual-source applications; suitable where MUX is implemented elsewhere or unnecessary. | Select when system already includes discrete ORing or only single-input operation is needed - saves cost and simplifies layout. |
| TPS63802DLAR | Buck-boost topology (2.5V–12V input, 1.8V–5.5V output); no MUX; 2A output; 2.5mm × 2.5mm QFN-11 package. | Supports wider VIN range including sub-3V battery discharge; lacks automatic source selection and ultra-low IQ standby mode. | Select when input voltage may fall below 3.0V (e.g., single-cell Li-ion) and dual-source redundancy is handled at system level. |
Compared with MAX77756BEWL+T, MAX77596EWA+T removes MUX functionality but retains identical buck performance and footprint, while TPS63802DLAR trades MUX integration and ultra-low IQ for buck-boost flexibility and higher current - making each optimal for distinct power architecture priorities.
Availability
MAX77756BEWL+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-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX77756BEWL+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX77756BEWL+T belongs to Maxim's ultra-compact power management portfolio, designed specifically for space-constrained, battery-sensitive systems requiring dual-input redundancy and nanoscale quiescent current.
FAQ
What is the absolute maximum input voltage rating for MAX77756BEWL+T?
The MAX77756BEWL+T has an absolute maximum rating of +26V on IN1 and IN2 pins relative to PGND, and +31V on BST relative to PGND. Operation above 24V input is not guaranteed, and exceeding these absolute maximums risks permanent damage. For reliable 24V operation, ensure proper derating and thermal management per θJA = 61.65°C/W.
Can MAX77756BEWL+T operate with only one input source?
Yes, MAX77756BEWL+T supports single-input operation: tie IN1 and IN2 to PGND and power the buck directly through the SUP pin. In this configuration, the MUX is bypassed, and the device functions as a standard 500mA synchronous buck regulator with I²C programmability and ultra-low IQ.
How does the MAX77756BEWL+T handle overcurrent conditions?
The MAX77756BEWL+T employs hiccup-mode short-circuit protection: when output current exceeds the selected ILIM threshold (700mA–1000mA), the converter stops switching, waits 15ms (tRETRY), then attempts soft-start again. This limits average power dissipation during faults and prevents thermal runaway without requiring external current-sense components.
What is the purpose of the BIAS pin on MAX77756BEWL+T?
The BIAS pin on MAX77756BEWL+T outputs a regulated 5V supply for internal circuitry. It must be bypassed with a 1μF ceramic capacitor to AGND and must not be loaded externally. BIAS powers the gate drivers, control logic, and I²C interface - ensuring stable operation independent of output loading or input transients.
Does MAX77756BEWL+T support spread-spectrum modulation?
Yes, MAX77756BEWL+T supports software-enabled spread-spectrum modulation with ±6% frequency deviation around its 1MHz nominal switching frequency. This feature reduces peak EMI emissions by spreading energy across a wider bandwidth, easing compliance with CISPR-22/32 Class B radiated emission limits in compact layouts.
MAX77756BEWL+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 15-WFBGA, WLBGA
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX77756BEWL+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77756BEWL+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 MAX77756BEWL+T reliable?
The price and inventory of MAX77756BEWL+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77756BEWL+T is usually 5 days.
3.What payment methods are accepted for MAX77756BEWL+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77756BEWL+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77756BEWL+T?
MAX77756BEWL+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77756BEWL+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 MAX77756BEWL+T?
For technical support, including MAX77756BEWL+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77756BEWL+T requirements.
6.How does Aetrix verify that MAX77756BEWL+T is sourced from the original manufacturer or authorized distributors?
All MAX77756BEWL+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 MAX77756BEWL+T meets industry standards.
7.What is the process for return or replacement of MAX77756BEWL+T?
All MAX77756BEWL+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77756BEWL+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 MAX77756BEWL+T part is unused and in its original packaging.
Return procedure for MAX77756BEWL+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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