Analog Devices Inc./Maxim Integrated MAX17505ATP+

Overview

MAX17505ATP+ from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with dual integrated MOSFETs, operating from 4.5V to 60V input and delivering up to 1.7A at 0.9V–90%VIN output. It features internal compensation, ±1.1% FB regulation accuracy over –40°C to +125°C, and peak efficiency >90%. Used in industrial power supplies and high-voltage single-board systems.

For engineers reviewing the MAX17505ATP+ datasheet, MAX17505ATP+ pinout, MAX17505ATP+ application, or MAX17505ATP+ equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternatives, and supply-chain support for production deployment.

Technical Context

The MAX17505ATP+ employs peak-current-mode control with user-selectable PWM, PFM, or DCM operation via the MODE pin. Its internal compensation eliminates external loop components across the full output voltage range. The device integrates a 5V LDO (VCC) with 4.75V–5.25V output and 26.5–100mA current limit, supporting self-biasing and external circuitry.

It implements hiccup-mode overcurrent protection with 2.4–3.25A peak current limit and thermal shutdown at 165°C (10°C hysteresis). The open-drain RESET pin asserts when FB falls below 92% of regulation and deasserts after 1024 cycles once FB rises above 95%, enabling reliable system power-good sequencing.

Key Specifications

Pinout & Package

MAX17505ATP+ is housed in a 20-pin, 4mm × 4mm TQFN package with exposed pad (EP), RoHS-compliant and lead(Pb)-free. Thermal resistance θ_JA = 33°C/W (4-layer board), enabling high-power density designs with minimal heatsinking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Compared with LM5164QPWPRQ1 and TPS54560BQDDARQ1, the MAX17505ATP+ delivers optimal balance of integration (internal LDO, compensation), precision (±1.1% FB), and thermal performance (33°C/W θ_JA) for industrial 1.7A POL applications - reducing bill-of-materials and layout risk without sacrificing robustness.

Availability

MAX17505ATP+ is available at Aetrix Electronics and suitable for industrial power supplies, distributed supply regulation, and base station power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAX17505ATP+ 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, communications, and computing applications.

The MAX17505ATP+ belongs to Maxim's high-voltage synchronous buck converter product line, engineered for rugged, high-efficiency DC-DC conversion in space-constrained industrial and telecom systems with wide input ranges.

FAQ

What is the maximum output current capability of the MAX17505ATP+ across temperature?

The MAX17505ATP+ delivers up to 1.7A continuous output current over the full industrial temperature range of –40°C to +125°C ambient, as confirmed by datasheet electrical characteristics and thermal derating curves. This rating assumes proper PCB layout with the exposed pad thermally connected to a large copper plane and adequate airflow or heatsinking per the 33°C/W θ_JA specification. At elevated temperatures, current capability remains stable due to integrated thermal shutdown at 165°C with 10°C hysteresis.

Does the MAX17505ATP+ require external compensation components?

No, the MAX17505ATP+ features built-in compensation that eliminates the need for external Type-II or Type-III compensation networks across its entire output voltage range (0.9V to 90%VIN). For switching frequencies below 500kHz, a capacitor from CF to FB is required to complete the internal compensation loop; at 500kHz or higher, the CF pin is left open. This integration reduces component count, board area, and design validation effort while maintaining stable loop response.

How does the MODE pin configure operating modes in the MAX17505ATP+?

The MODE pin on the MAX17505ATP+ selects among three distinct control schemes: grounding MODE (to SGND) enables constant-frequency PWM operation at all loads; leaving MODE open configures PFM mode with pulse skipping at light loads for highest efficiency; connecting MODE to VCC activates DCM mode, which disables negative inductor current but maintains fixed frequency down to lighter loads than PFM. Each mode is validated in the datasheet's typical operating characteristics, with efficiency curves showing clear trade-offs between light-load performance and EMI profile.

What is the function of the RESET pin on the MAX17505ATP+ and how is it triggered?

The RESET pin on the MAX17505ATP+ is an open-drain output that signals power-good status. It asserts low when the feedback voltage (FB) drops below 92% of its regulated value (e.g., <0.828V for a 0.9V output), indicating output undervoltage. It deasserts (goes high) 1024 switching cycles after FB rises above 95% of regulation (e.g., >0.855V for 0.9V). This delay ensures stable regulation before releasing system reset, and the open-drain structure allows wired-OR connection with other power monitors in complex systems.

Can the MAX17505ATP+ operate with a prebiased output during startup?

Yes, the MAX17505ATP+ supports prebiased power-up, as demonstrated in Figures 16–17 of the datasheet. When the output is already biased (e.g., 2.5V present before enable), the device's soft-start circuitry controls the high-side MOSFET gate to prevent reverse current flow and output collapse. This behavior is enabled by internal circuitry that monitors the SS pin and LX node, allowing safe startup into existing voltage rails - essential for hot-swap and redundant power systems where outputs may be live prior to controller activation.