Analog Devices Inc./Maxim Integrated MAX17761ATC+T

Overview

MAX17761ATC+T from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with integrated high-side pMOS and low-side nMOS FETs, operating from 4.5V to 76V input and delivering up to 1A output current. It supports programmable output voltage from 0.8V to 90% of VIN, achieves ±1.5% feedback regulation accuracy over –40°C to +125°C, and features peak-current-mode control with selectable PWM or PFM operation-used in industrial control power supplies and high-voltage single-board systems.

For engineers reviewing the MAX17761ATC+T datasheet, MAX17761ATC+T pinout, MAX17761ATC+T application, or MAX17761ATC+T equivalent, key selection considerations include its wide 4.5–76V input range, internal MOSFET integration eliminating external Schottky diodes, adjustable 200–600kHz switching frequency, programmable current limit via MODE/ILIM resistor, and built-in RESET monitoring with 2.1ms delay.

Technical Context

The MAX17761ATC+T employs a peak-current-mode control architecture with an internal transconductance error amplifier, slope compensation generator, and PWM comparator. Its dual LDO structure powers VCC either from VIN (via internal 4.5V–76V LDO) or EXTVCC (when >4.74V), improving efficiency at high input voltages.

It supports monotonic startup into prebiased loads and implements robust protection including overtemperature shutdown (160°C trigger, 20°C hysteresis), output-voltage monitoring with open-drain RESET, and programmable soft-start via external capacitor on SS pin. Current limiting is set by resistor on MODE/ILIM, enabling selection between 1.14A/1.6A peak limits and PWM/PFM modes.

Key Specifications

Pinout & Package

MAX17761ATC+T is housed in a 12-pin, 3mm × 3mm TDFN package with exposed pad (EP) connected to SGND. Thermal performance is optimized via EP-to-ground-plane connection using multiple thermal vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5164QDDARQ1 and TPS54160DGQR, the MAX17761ATC+T delivers superior integration (internal FETs, dual-LDO VCC, RESET, PFM mode), tighter temperature-stable regulation (±1.5%), and broader input range (up to 76V), making it optimal for space-constrained industrial and telecom power designs.

Availability

MAX17761ATC+T is available at Aetrix Electronics and suitable for industrial control power supplies, distributed supply regulation, and basestation power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX17761ATC+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 industrial, automotive, and communications markets.

The MAX17761ATC+T belongs to Maxim's high-voltage synchronous buck converter product line, engineered specifically for rugged, wide-input industrial and telecom power applications where reliability, integration, and thermal robustness are critical.

FAQ

What is the maximum input voltage rating for the MAX17761ATC+T?

The MAX17761ATC+T has an absolute maximum input voltage rating of +80V relative to SGND, with recommended continuous operation up to 76V. This allows safe use with 48V and 72V industrial and telecom distribution rails while maintaining margin against transients. Operation beyond 76V may reduce lifetime or trigger overvoltage protection depending on external circuit design.

Does the MAX17761ATC+T support prebiased output startup?

Yes, the MAX17761ATC+T supports monotonic startup into prebiased outputs. During power-up, both high-side and low-side switches remain off until the first PWM pulse is commanded, preventing reverse current flow from the output. This behavior is inherent to the control architecture and requires no external configuration-ensuring safe operation in systems with hold-up capacitors or shared rails.

How is the switching frequency set on the MAX17761ATC+T?

The MAX17761ATC+T switching frequency is set by connecting a resistor from the RT/SYNC pin to SGND: 210kΩ for 200kHz, 140kΩ for 300kHz, 105kΩ for 400kHz, or 69.8kΩ for 600kHz. Alternatively, an external clock signal within 1.15× to 1.4× the programmed fSW can be applied to RT/SYNC to synchronize multiple converters and reduce EMI peaks.

What protection features does the MAX17761ATC+T include?

The MAX17761ATC+T integrates thermal shutdown (160°C trigger, 20°C hysteresis), output-voltage monitoring with open-drain RESET (asserted low at 92% of setpoint), programmable EN/UVLO, overcurrent protection with valley and peak current limits, and monotonic prebiased startup. These features eliminate the need for external supervision ICs in most industrial applications.

Can the MAX17761ATC+T operate in both PWM and PFM modes?

Yes, the MAX17761ATC+T supports both PWM and PFM modes, selected via resistor on the MODE/ILIM pin. PWM provides constant-frequency operation ideal for noise-sensitive applications; PFM disables negative inductor current and skips pulses at light loads to achieve <200µA quiescent current and >85% efficiency at 1mA load-critical for energy-efficient standby operation.