Analog Devices Inc./Maxim Integrated MAX17505SATP+T

Overview

MAX17505SATP+T 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 output current at 0.9V–90%VIN. 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 where compact, robust point-of-load regulation is required.

For engineers reviewing the MAX17505SATP+T datasheet, MAX17505SATP+T pinout, MAX17505SATP+T application, or MAX17505SATP+T equivalent, key selection considerations include its 20-pin TQFN (4mm × 4mm) package, MODE-selectable PWM/PFM/DCM operation, programmable soft-start, open-drain RESET, and resistor-programmable EN/UVLO threshold - all critical for stable, low-component-count, wide-input industrial power designs.

Technical Context

The MAX17505SATP+T implements peak-current-mode control with three selectable operating modes via the MODE pin: PWM (constant frequency), PFM (pulse-skipping for light-load efficiency), and DCM (discontinuous conduction without pulse skipping). Its internal compensation eliminates external loop components across the full output voltage range.

It integrates a 5V LDO (VCC) with 4.75V–5.25V output and 100mA current limit, dual nMOS power switches (R_DS(on)H = 325mΩ max, R_DS(on)L = 150mΩ max), and precision feedback regulation (V_{FB_REG} = 0.9V ±1.1%). The device supports external synchronization (1.1× to 1.4× f_SW) and offers hiccup-mode overcurrent protection with autoretry startup.

Key Specifications

Pinout & Package

MAX17505SATP+T is housed in a 20-pin, 4mm × 4mm TQFN package with exposed pad (package code T2044+4), optimized for thermal performance on multilayer PCBs (θ_JA = 33°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5164QPWPRQ1 and TPS54260DGQR, the MAX17505SATP+T delivers optimal balance of integration (internal compensation, MODE-selectable operation, RESET, soft-start), industrial temperature range, and compact 4mm × 4mm footprint - making it ideal for space- and efficiency-sensitive non-automotive industrial POL designs.

Availability

MAX17505SATP+T 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 RoHS-compliant packaging.

Supply support for MAX17505SATP+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 industrial, communications, and computing markets.

The MAX17505SATP+T belongs to Maxim's high-voltage synchronous buck converter product line, designed specifically for rugged, wide-input industrial and telecom power applications where reliability, small size, and minimal external components are essential.

FAQ

What is the maximum output current capability of the MAX17505SATP+T?

The MAX17505SATP+T delivers up to 1.7A continuous output current over its full operating temperature range (–40°C to +125°C ambient). This rating is validated with proper thermal design using the exposed pad and recommended PCB layout per the MAX17505 evaluation kit documentation. Peak current-limit threshold is 2.8A (typ), supporting transient load demands beyond steady-state requirements.

Does the MAX17505SATP+T require external compensation components?

No, the MAX17505SATP+T features built-in compensation circuitry that eliminates the need for external compensation components across its entire output voltage range (0.9V to 90%VIN). This internal architecture simplifies design, reduces bill-of-materials count, and ensures stable operation without iterative loop tuning - a key differentiator versus many competing buck controllers.

How does the MODE pin affect the MAX17505SATP+T's efficiency profile?

The MODE pin configures the MAX17505SATP+T into one of three operating modes: PWM (MODE = GND), PFM (MODE = open), or DCM (MODE = VCC). PFM maximizes light-load efficiency by skipping pulses; DCM maintains constant frequency while disabling negative inductor current; PWM ensures fixed-frequency operation for EMI-sensitive applications. Each mode directly impacts efficiency vs. load curves shown in Figures 3–6 of the datasheet.

What is the function of the RESET pin on the MAX17505SATP+T?

The RESET pin on the MAX17505SATP+T is an open-drain output that signals power-good status. It asserts low when the FB voltage falls below 92% of its regulated value (e.g., <0.828V for a 0.9V reference) and deasserts high after 1024 clock cycles once FB rises above 95% (e.g., >0.855V). This provides a reliable, glitch-free reset signal for downstream microcontrollers or FPGAs.

Can the MAX17505SATP+T be synchronized to an external clock source?

Yes, the MAX17505SATP+T supports external frequency synchronization via the SYNC pin. It accepts an external clock signal within a capture range of 1.1× to 1.4× the internally set switching frequency (determined by the RT resistor). This feature enables coherent switching across multiple converters to reduce beat frequencies and simplify EMI filtering in multi-rail power systems.