Analog Devices Inc./Maxim Integrated MAX17501HATB+T

Overview

MAX17501HATB+T from Maxim Integrated is a 60V-input, 500mA synchronous step-down DC-DC converter with integrated high-side pMOS and low-side nMOS FETs, fixed 5V output, ±1.7% output voltage accuracy over –40°C to +125°C, and 300kHz switching frequency. It operates in forced-PWM mode for noise-sensitive applications and delivers peak efficiency >90% at full load.

For engineers reviewing the MAX17501HATB+T datasheet, MAX17501HATB+T pinout, MAX17501HATB+T application, or MAX17501HATB+T equivalent, key selection considerations include its 3mm × 2mm TDFN package, resistor-programmable EN/UVLO threshold (1.218V typ), open-drain RESET output with 95.5% rising threshold, and hiccup-mode overcurrent protection triggered at 780mA runaway current limit.

Technical Context

The MAX17501HATB+T implements peak-current-mode control with internal transconductance error amplifier (GM = 590µS typ) and slope compensation, enabling stable regulation across wide input (4.5V–60V) and load (0–500mA) ranges. Its forced-PWM operation maintains fixed 300kHz switching frequency regardless of load, eliminating audible noise and simplifying EMI filtering.

It integrates a 5V LDO (VCC) with 40mA drive capability, programmable soft-start via external capacitor on SS pin, and robust protection including hiccup-mode current limiting, thermal shutdown at 165°C, and output voltage monitoring via open-drain RESET with 1024-cycle delay after regulation is achieved.

Key Specifications

Pinout & Package

MAX17501HATB+T is housed in a 10-pin, 3mm × 2mm TDFN package with exposed pad (EP) connected to GND for thermal dissipation. Pin 1 is PGND; pin 10 is LX; EP must be soldered to a large copper plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5164QDDARQ1 and TPS54360DGQR, MAX17501HATB+T provides tighter output accuracy (±1.7% vs. ±2%), integrated RESET with programmable thresholds, smaller TDFN footprint, and lower shutdown current - making it optimal for space-constrained industrial and telecom point-of-load designs where precision and fault reporting are critical.

Availability

MAX17501HATB+T is available at Aetrix Electronics and suitable for industrial process control, HVAC and building control, and base station power management requiring stable component supply and long-term lifecycle support.

Supply support for MAX17501HATB+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 high-performance analog and mixed-signal ICs for industrial, automotive, communications, and computing markets.

The MAX17501 product line delivers ultra-small, high-efficiency synchronous buck regulators targeting harsh-environment point-of-load applications where wide input range, precision output, and robust protection are essential.

FAQ

What is the switching frequency of the MAX17501HATB+T?

The MAX17501HATB+T operates at a fixed 300kHz switching frequency in forced-PWM mode. This value is guaranteed across temperature (–40°C to +125°C) and input voltage (4.5V–60V), with typical tolerance of ±10% (280kHz to 320kHz). The fixed frequency simplifies EMI filter design and avoids audible noise in sensitive applications.

Does the MAX17501HATB+T require external feedback resistors for 5V output?

No. The MAX17501HATB+T is a fixed 5V output variant with internal feedback divider and reference. Pin 5 (FB/VO) connects directly to the output node - no external resistors are needed. This reduces component count, improves accuracy (±1.7% over temperature), and eliminates resistor tolerance drift effects.

How does the RESET pin on the MAX17501HATB+T function?

The RESET pin on the MAX17501HATB+T is an open-drain output that asserts low when the regulated output falls below 92.5% of nominal (4.625V for 5V output) and goes high 1024 switching cycles after the output rises above 95.5% (4.775V). It requires an external pullup resistor and sinks up to 2mA when active - providing reliable power-good signaling to microcontrollers and FPGAs.

What is the maximum continuous output current of the MAX17501HATB+T?

The MAX17501HATB+T delivers up to 500mA of continuous output current under thermal limits. This rating assumes proper PCB layout with the exposed pad (EP) soldered to a ≥100mm² copper area and ambient temperature ≤70°C. At higher temperatures or reduced copper area, derating applies per θJA = 67.3°C/W.

Can the MAX17501HATB+T start up into a precharged output?

Yes. The MAX17501HATB+T supports prebiased start-up: both high-side and low-side MOSFETs remain off until the first PWM command, preventing reverse current flow into an already charged output capacitor. This feature protects downstream circuits and avoids output voltage collapse during hot-plug or multi-rail sequencing scenarios.