Analog Devices Inc./Maxim Integrated MAX77816DEWP+T

Overview

The MAX77816DEWP+T from Maxim Integrated is a high-efficiency, 5A-capable buck-boost regulator in a 20-bump WLP package (1.827mm × 2.127mm), designed for single-cell Li-ion battery-powered systems. It delivers programmable output voltage from 2.60V to 5.14V in 20mV steps, supports seamless buck/boost mode transition, and achieves 97.5% peak efficiency with 40µA quiescent current - enabling stable power delivery in space-constrained mobile applications such as smartphones and wearables.

For engineers reviewing the MAX77816DEWP+T datasheet, MAX77816DEWP+T pinout, MAX77816DEWP+T application, or MAX77816DEWP+T equivalent, key selection criteria include its I²C-programmable V_OUT, GPIO-configurable functionality (Power-OK indicator in this variant), 2.5MHz switching frequency, thermal shutdown at +165°C, and support for ≤16µF minimum effective output capacitance.

Technical Context

The MAX77816DEWP+T implements a four-switch H-bridge topology operating at 2.5MHz fixed-frequency PWM with current-mode control, enabling continuous regulation across input voltages from 2.3V to 5.5V and output voltages from 2.60V to 5.14V. Its unique phase sequencing (Φ1–Φ3) dynamically adapts between buck, buck-boost, and boost modes without discontinuity.

This variant (D suffix) configures the multifunction GPIO as an open-drain Power-OK (POK) indicator with 92.5% rising and 90% falling thresholds relative to V_OUT, requiring an external pullup resistor. The device integrates soft-start (120µs typical), true shutdown (<1µA shutdown current), and active discharge (100Ω internal resistor).

Key Specifications

Pinout & Package

Package: 20-bump Wafer-Level Package (WLP), 1.827mm × 2.127mm, 0.4mm pitch, bottom-side bump layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar buck-boost regulator applications.

Compared with TPS63802DLAR and NCP1599MUTBG, the MAX77816DEWP+T offers superior design flexibility through I²C-programmable output voltage, GPIO-configurable POK indication, and integrated active discharge - making it optimal for advanced portable systems requiring dynamic power management and robust sequencing.

Availability

MAX77816DEWP+T is available at Aetrix Electronics and suitable for smartphones, wearable devices, and wireless communication modules requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MAX77816DEWP+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 consumer applications.

The MAX77816 product line targets high-density, battery-powered portable electronics, delivering compact, efficient, and feature-rich power conversion with integrated digital control and system monitoring capabilities.

FAQ

What is the default output voltage setting for the MAX77816DEWP+T?

The MAX77816DEWP+T has a default output voltage of 3.3V, set by VOUT[6:0] = 0x23 at power-on reset. This value is stored in nonvolatile register bits and can be modified via I²C write to the BB_VOUT register. The 20mV step resolution allows fine-tuning from 2.60V to 5.14V, supporting diverse SoC and peripheral voltage requirements without changing external feedback resistors.

How does the GPIO pin function in the MAX77816DEWP+T?

In the MAX77816DEWP+T, the GPIO pin is configured as an open-drain Power-OK (POK) indicator per the 'D' variant designation. It asserts high-impedance (pulled up externally) when VOUT reaches ≥92.5% of the target voltage and pulls low when VOUT drops below 90%. This provides reliable system-level power-good signaling for sequenced startup, eliminating need for discrete comparators or external monitoring circuits.

What is the minimum output capacitance required for stable operation of the MAX77816DEWP+T?

The MAX77816DEWP+T requires a minimum effective output capacitance of 16µF, as specified in the Electrical Characteristics table. Due to DC bias derating of ceramic capacitors, a 47µF, 6.3V X5R/X7R capacitor is recommended. This ensures loop stability, limits output voltage ripple to <10mV_pp under transient loads, and maintains regulation during fast load steps up to 1.5A.

Does the MAX77816DEWP+T support forced PWM (FPWM) mode?

No - the MAX77816DEWP+T does not support FPWM mode. The 'D' variant configures GPIO exclusively as a Power-OK indicator, disabling FPWM enable functionality. FPWM is only available in MAX77816A and MAX77816F variants where GPIO is assigned to FPWM control. For low-noise applications requiring fixed-frequency operation, designers must select an alternate variant or implement external clock synchronization.

What thermal protection features are integrated into the MAX77816DEWP+T?

The MAX77816DEWP+T includes thermal shutdown at +165°C with 20°C hysteresis, preventing permanent damage during sustained overload or poor PCB thermal design. When junction temperature exceeds the threshold, the device immediately disables switching and resets all type-O registers. Recovery occurs automatically once temperature falls below +145°C. This complements overcurrent protection (triggered after 3ms of ILIM violation) and short-circuit protection for comprehensive system reliability.