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Analog Devices Inc./Maxim Integrated MAX77831BEWB+T
- Part No.:
- MAX77831BEWB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 35-WFBGA, WLBGA
- Datasheet:
-
MAX77831BEWB+T.pdf
- Description:
- IC REG BUCK BOOST ADJ 2A 35WLP
- Quantity:
- Payment:
- Shipping:
Inventory:5,595
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Product details
Overview
The MAX77831BEWB+T from Analog Devices is a high-efficiency, forced-PWM-only buck-boost converter supporting 2.5V–16V input and delivering up to 6A in buck mode or 4A in boost mode (≤1.3 ratio), with 7A switching current capability and 1.8MHz default switching frequency. It operates with internal or external feedback resistors for 5V or 3V–15V output voltage configuration, and integrates I²C programmability for dynamic voltage scaling, slew rate control, and fault masking - ideal for compact, wide-input industrial power rails.
For engineers reviewing the MAX77831BEWB+T datasheet, MAX77831BEWB+T pinout, MAX77831BEWB+T application, or MAX77831BEWB+T equivalent, key selection criteria include its 35-bump WLP package footprint, RSEL-configurable slave address and current limit, FPWM-only operation for low-noise regulation, and dual-mode feedback architecture enabling both fixed-startup and post-startup I²C voltage adjustment across battery-powered and non-battery systems.
Technical Context
The MAX77831BEWB+T implements a synchronous four-switch H-bridge buck-boost topology with integrated high-side and low-side MOSFETs (RDSON_HS/LS = 20–35mΩ). Its control loop operates exclusively in forced-PWM mode-no PFM or skip mode-ensuring consistent ripple and predictable EMI behavior across load conditions.
Configuration is split between hardware (RSEL pin decoding) and software (I²C interface): RSEL selects among four I²C slave addresses, four current-limit thresholds (3.8A–7.0A), and internal/external feedback mode; I²C overrides RSEL settings for output voltage (4.5V–15V), slew rate, switching frequency (1.2/1.5/1.8MHz), and protection mask registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 16V - supports single-rail operation across USB PD, 12V industrial buses, and multi-cell Li-ion batteries without pre-regulation. |
| Output Current Capability | Buck mode: up to 6A; Boost mode: up to 4A (boost ratio ≤1.3) - enables high-power point-of-load conversion in space-constrained designs. |
| Switching Frequency | Default 1.8MHz; selectable 1.5MHz or 1.2MHz via I²C - allows optimization of inductor size vs. efficiency and EMI filtering requirements. |
| Output Voltage Range | 4.5V–15V (internal FB); 3.0V–15V (external FB) - supports FPGA core, SoC I/O, and analog subsystems with precise startup and runtime DVS. |
| Protection Features | UVLO (2.4V typ), OVP (15.9V typ), OCP (programmable 0.98A–7.0A), thermal shutdown (150°C) - ensures robust operation under fault and transient conditions. |
| Package | 2.83mm × 2.03mm, 35-bump wafer-level package (WLP) - enables ultra-dense PCB layouts without requiring HDI routing. |
| I²C Interface | Standard/fast-mode compatible; supports slave address selection, register read/write, and interrupt masking - enables system-level power sequencing and telemetry. |
Pinout & Package
The MAX77831BEWB+T is housed in a 2.83mm × 2.03mm, 35-bump wafer-level package (WLP) with 0.4mm pitch and bottom-side solder bumps. The package supports standard reflow assembly and does not require high-density interconnect (HDI) PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Primary power input (2.5V–16V); connects to bulk input capacitor and must be decoupled near package. |
| OUT | Regulated output | Power output node; connects to output capacitor and load; supports active discharge when EN is deasserted. |
| LX1 / LX2 | Switch node terminals | Internal H-bridge switch nodes; connect to external inductor; require low-inductance layout for efficiency and EMI control. |
| FB | Feedback input | Senses output voltage; used with internal resistors (5V default) or external divider (3V–15V range) to set VOUT. |
| SEL | Configuration select | Resistor-programmed pin selecting I²C address, current limit threshold, and FB source (internal/external). |
| EN | Enable control | Active-high logic input (1.08V–2.0V VIO-compatible); controls startup/shutdown sequence and soft-start initiation. |
| POKB/INTB | Open-drain status/fault | Combines Power-OK monitoring (95% rising threshold) and configurable fault interrupt (OVP/OCP/THS) on single pin. |
| SCL / SDA | I²C serial interface | Standard bidirectional I²C bus pins; support register access for DVS, slew rate, frequency, and protection mask configuration. |
| VL | Internal LDO output | 1.8V (±5%) regulated supply for internal circuitry; requires 0.47μF ceramic bypass capacitor. |
| VIO | I/O supply | 1.08V–2.0V digital interface supply; powers EN, SEL, SCL, SDA, and POKB/INTB logic levels. |
| AGND / PGND | Analog & power ground | Separate AGND (reference) and PGND (high-current return) pins minimize noise coupling into feedback path. |
| BST1 / BST2 | Bootstrap supplies | Charge pump inputs for high-side gate drive; require 0.22μF/25V ceramic capacitors tied to LX1/LX2 respectively. |
Key Features
| Feature | Design Value |
|---|---|
| Forced-PWM only operation | Eliminates audible noise and output voltage ripple variation at light loads - critical for noise-sensitive analog and RF subsystems. |
| RSEL-configurable hardware settings | Single external resistor sets I²C address, current limit, and feedback mode - reduces BOM count and simplifies board-level configuration. |
| I²C-programmable dynamic voltage scaling | Adjusts output voltage from 4.5V to 15V post-startup with user-defined slew rates (1/6 to 7/6 mV/μs) - enables adaptive power management for processors and FPGAs. |
| Integrated active output discharge | 5mA discharge current when EN is low or VIN drops below UVLO - prevents floating outputs and ensures safe power-down sequencing. |
| Comprehensive fault protection | Independent UVLO, OVP (15.9V), OCP (7A max), and thermal shutdown (150°C) with latch-off and interrupt reporting - enhances system reliability in unattended operation. |
Applications
| Industrial PLC I/O Modules | Portable Medical Imaging Sensors |
|---|---|
Use Scenario: Powering isolated analog front-ends and ADC drivers in DIN-rail mounted controllers with 9–36V DC input rails. IC Role / Device Role / Timing Role: Primary buck-boost regulator providing stable 5V/3.3V rails from variable industrial supply while maintaining low EMI in shared enclosures. Use Value: FPWM-only operation avoids frequency modulation noise that could couple into sensitive measurement circuits; 35-bump WLP minimizes board area in dense I/O card layouts. | Use Scenario: Supplying image sensor arrays and low-noise amplifiers in handheld ultrasound probes powered by dual-cell Li-ion (6–8.4V). IC Role / Device Role / Timing Role: Wide-input buck-boost converter delivering regulated 1.8V and 3.3V rails with fast transient response during burst-mode imaging. Use Value: I²C-controlled DVS enables real-time voltage scaling to match sensor gain settings; active discharge ensures clean power-down between scans. |
| Automotive Infotainment Head Units | 5G Small Cell Remote Radio Units |
Use Scenario: Generating 5V and 12V auxiliary rails from vehicle battery (9–16V) in head units with strict EMC requirements. IC Role / Device Role / Timing Role: Main power stage converting unregulated automotive input to stable intermediate rails for SoC, display, and audio subsystems. Use Value: 1.8MHz switching frequency allows use of small 1.5μH inductors; RSEL configuration eliminates need for additional I²C pull-ups in cost-sensitive modules. | Use Scenario: Powering RF transceivers and FEMs in outdoor small cells operating from 48V PoE++ or 24V DC input with thermal constraints. IC Role / Device Role / Timing Role: High-efficiency intermediate converter stepping down 24V to 5V/3.3V for baseband processing and clock distribution. Use Value: 7A switching current supports peak transmit loads; thermal shutdown (150°C) and OVP (15.9V) protect against field failures in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | Lower 4A max output current; no I²C interface; fixed 3.3V/5V options or external resistor programming only. | Lacks dynamic voltage scaling and fault interrupt reporting - suitable for simpler, cost-driven applications without telemetry needs. | Choose when I²C control and programmable slew rate are unnecessary and board space permits larger 2.5mm × 2.5mm QFN package. |
| ISL91302BFRZ-T7A | Supports dual-output (2x buck-boost) in same 2.8mm × 2.0mm WLP; higher 8A switching current; includes PMBus interface. | Offers two independent regulated outputs and PMBus telemetry - better for multi-rail SoC power but adds firmware complexity. | Prefer when simultaneous 1.2V + 3.3V rails are required and system firmware supports PMBus command sets. |
Compared with TPS63020DSJR and ISL91302BFRZ-T7A, the MAX77831BEWB+T uniquely balances ultra-compact WLP packaging, I²C-based DVS with fine-grained slew control, and RSEL hardware configurability - making it optimal for single-rail, thermally constrained, and dynamically managed power systems where layout density and runtime adaptability are prioritized.
Availability
The MAX77831BEWB+T is available at Aetrix Electronics and suitable for industrial automation, portable medical devices, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX77831BEWB+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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The MAX77831BEWB+T belongs to Analog Devices' MAX® power management product line, designed specifically for high-efficiency, wide-input-range DC-DC conversion in space- and thermal-constrained portable and embedded systems.
FAQ
What is the default output voltage of the MAX77831BEWB+T when using internal feedback resistors?
The MAX77831BEWB+T has a default output voltage of 5V when configured with internal feedback resistors. This setting is factory-trimmed and requires no external components. The device also supports programmable output voltages from 4.5V to 15V using internal feedback or 3V to 15V with external resistors - all accessible via I²C after startup. The 5V default simplifies evaluation and reference designs for common logic rail requirements.
Does the MAX77831BEWB+T support pulse-frequency modulation (PFM) or discontinuous conduction mode (DCM)?
No, the MAX77831BEWB+T operates exclusively in forced-PWM (FPWM) mode across all load conditions. It does not enter PFM, skip mode, or DCM - ensuring constant switching frequency, predictable EMI spectrum, and minimal output voltage ripple at light loads. This design choice prioritizes noise-sensitive applications like precision analog, RF, and high-speed digital interfaces where variable-frequency operation could cause interference.
How is the I²C slave address selected on the MAX77831BEWB+T?
The I²C slave address of the MAX77831BEWB+T is selected using the SEL pin with an external resistor. Four discrete resistance values (per Table 3 in the datasheet) configure one of four possible 7-bit slave addresses: 0x68, 0x69, 0x6A, or 0x6B. This hardware-based addressing eliminates I²C address conflicts in multi-device systems and avoids requiring firmware initialization before communication - enabling immediate register access upon power-up when VIO and EN are asserted.
What protection features are integrated into the MAX77831BEWB+T?
The MAX77831BEWB+T integrates undervoltage lockout (UVLO, 2.4V typical), overvoltage protection (OVP, 15.9V typical), overcurrent protection (OCP, programmable from 0.98A to 7.0A), and thermal shutdown (150°C junction threshold). All protections trigger fault interrupts via the POKB/INTB pin and can be individually masked via I²C registers. No external components are needed to enable these functions - they are fully internal and production-tested across temperature and voltage ranges.
Can the MAX77831BEWB+T operate without an I²C interface connected?
Yes, the MAX77831BEWB+T operates fully without I²C connectivity. When SCL and SDA are left unconnected (or pulled to VIO via 10kΩ resistors), the device uses RSEL-selected hardware defaults for output voltage (via internal or external FB), switching frequency (1.8MHz), and current limit. I²C is optional and only required for dynamic voltage scaling, slew rate adjustment, or real-time fault monitoring - making the MAX77831BEWB+T suitable for both simple fixed-output and advanced programmable power architectures.
MAX77831BEWB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 35-WFBGA, WLBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 2A
- Frequency - Switching:
- 1.2MHz ~ 1.8MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 35-WLP (2.83x2.03)
MAX77831BEWB+T FAQ
1.How can I place an order for MAX77831BEWB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77831BEWB+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 MAX77831BEWB+T reliable?
The price and inventory of MAX77831BEWB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77831BEWB+T is usually 5 days.
3.What payment methods are accepted for MAX77831BEWB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77831BEWB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77831BEWB+T?
MAX77831BEWB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77831BEWB+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 MAX77831BEWB+T?
For technical support, including MAX77831BEWB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77831BEWB+T requirements.
6.How does Aetrix verify that MAX77831BEWB+T is sourced from the original manufacturer or authorized distributors?
All MAX77831BEWB+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 MAX77831BEWB+T meets industry standards.
7.What is the process for return or replacement of MAX77831BEWB+T?
All MAX77831BEWB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77831BEWB+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 MAX77831BEWB+T part is unused and in its original packaging.
Return procedure for MAX77831BEWB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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