Analog Devices Inc./Maxim Integrated MAX17250ATD+T

Overview of the MAX17250ATD+T Boost Converter from Analog Devices/Maxim Integrated

The MAX17250ATD+T from Analog Devices Inc./Maxim Integrated is a synchronous boost (step-up) DC-DC converter engineered for high efficiency and low quiescent current, supporting modern portable and battery-powered systems. Supplied in a compact 14-pin TDFN (3mm x 3mm) or an ultra-small WLP option, the MAX17250ATD+T is capable of converting input voltages from 2.7V to 18V, and generating output voltages adjustable between 3V and 18V. With its advanced features—such as selectable input peak current limit, 0.1 μA True Shutdown™, and robust short-circuit protection—it serves as a key building block for engineers developing compact, low-power systems.

Main Characteristics and Performance Benefits of the MAX17250ATD+T

MAX17250ATD+T is distinguished by a suite of performance-driven features. Its synchronous boost architecture achieves up to 93% efficiency, optimizing battery life in portable equipment. The device’s quiescent current is just 60μA (typical), and it supports a True Shutdown mode with an industry-leading 0.1μA shutdown current, minimizing leakage and maximizing stand-by time. Integrated power FETs enable selectable input peak current limits of 1.85A, 2.7A, or 3.5A, tailored via a configurable ISET pin to match load and inductor profiles. Furthermore, the MAX17250ATD+T guarantees operation across a wide temperature range (-40°C to +125°C) and supports soft-start inrush current protection, overtemperature shutdown, and comprehensive output short-circuit protection.

Common Uses of the MAX17250ATD+T in System Development

The flexibility and efficiency of the MAX17250ATD+T make it ideal for a range of applications. Key use cases include digital cameras, IoT endpoints, display power supplies, 1 or 2-cell Li-Ion systems, and components such as buzzers and alarm drivers. Its wide operating input and output range, combined with programmable peak current, enable usage in scenarios where both high current and low standby power are critical. For example, in compact IoT nodes powered by 2xAA or Li-Ion batteries, MAX17250ATD+T ensures efficient power conversion with minimal quiescent losses in long sleep cycles.

Electrical Specifications and Operating Parameters of the MAX17250ATD+T

Engineers benefit from the extensive voltage flexibility that MAX17250ATD+T offers. It accepts input voltages from 2.7V to 18V and provides output voltages that are adjustable in the 3V to 18V range—making it suitable for direct operation from a variety of battery chemistries. Peak input current limits can be picked according to system needs (1.85A, 2.7A, or 3.5A), all set through the ISET pin detected at power-up. The device utilizes pulse-frequency modulation with fixed 800ns on-time and 200ns minimum off-time for efficient operation in both continuous and discontinuous conduction modes. It supports switching frequencies up to 1 MHz.

Typical system operating scenarios can include, for instance, stepping up a 7.2V battery to 12V at up to ≈0.76A output current, with the output current dependent on the peak current setting, duty cycle (up to 78%), and thermal considerations.

Design Integration of the MAX17250ATD+T Circuit Design Factors

Effective utilization of the MAX17250ATD+T involves precise external component selection and system configuration. The output voltage is programmed using a resistor divider connected to the feedback (FB) pin; care should be taken to use accurate (≤1% tolerance) resistors and appropriate impedance to minimize noise, especially in continuous conduction mode. Inductor selection is closely linked to the output voltage and peak current—guidance tables are included in the datasheet for optimal values under different load conditions.

To further ensure stable operation, ceramic capacitors with low ESR (such as X5R/X7R) are recommended for input and output. Sizing and placement should consider input voltage ripple and the potential for input voltages near UVLO thresholds. The enable (EN) pin supports direct drive from logic or VIN, and careful consideration is needed for high-voltage setups to avoid exceeding the EN pin maximum rating.

Thermal Management, PCB Layout Guidelines, and Packaging Choices for the MAX17250ATD+T

The MAX17250ATD+T is available in both a thermally efficient 14-TDFN package with exposed pad and a compact 12-bump WLP. Managing thermal performance is pivotal, especially at high output currents or in high ambient temperatures. The TDFN’s exposed pad should be well connected to PCB ground via thermal vias for efficient heat disspation. Optimized PCB layout is essential: minimize the length and area of traces on the main power path (IN, LX, PVH, OUT, PGND) to reduce noise and losses, and carefully isolate sensitive feedback signals. Reference layouts from evaluation kits provide a strong starting point for robust designs.

Protection Mechanisms and Reliability Features of the MAX17250ATD+T

Protective features are integral to system reliability in the MAX17250ATD+T. True Shutdown thoroughly disconnects input and output domains, preventing leakage when the device is off, especially important in battery-powered designs. Additional protections include programmable soft-start limiting inrush current, output short-circuit latch-off, and intelligent thermal shutdown with automatic recovery. Output current limitation is governed by the device’s peak current and thermal constraints—calculations are recommended to ensure safe continuous operation without exceeding the 125°C junction temperature maximum. These mechanisms collectively ensure device and application-level robustness in the face of common power system faults.

Alternative or Substitute Models for the MAX17250ATD+T

When evaluating alternatives to the MAX17250ATD+T, designers should consider several factors such as input/output voltage range, efficiency, quiescent current, protection features, and package availability. Comparable devices from other vendors could include synchronous boost converters supporting similar input/output voltages, True Shutdown features, and programmable current limit options. Depending on output requirements and system priorities, devices like the Texas Instruments TPS61088, Texas Instruments TPS61288, or Analog Devices’ own MAX756 and MAX757 legacy products may provide a starting point. However, close attention must be paid to feature parity, especially regarding quiescent and shutdown current, integrated protections, and thermal performance.

Conclusion

The MAX17250ATD+T from Analog Devices Inc./Maxim Integrated stands out as a high-efficiency, low-IQ, and highly configurable boost converter for applications demanding extended battery life and robust protection. It provides engineers with high-impact features—such as True Shutdown and programmable current limits—while supporting wide input and output voltages, making it a compelling choice for new and existing power supply designs in battery-centric applications. Thorough understanding of its capabilities and constraints, as outlined in this article, will support informed selection and optimum implementation in demanding electronic systems.