Analog Devices Inc./Maxim Integrated MAX17651AZT+T

Overview

MAX17651AZT+T from Analog Devices is an ultra-low quiescent current, high-voltage linear regulator designed for industrial and battery-powered systems. It operates from 4V to 60V input, delivers up to 100mA output current, maintains ±2% feedback voltage accuracy over temperature, features a 0.6V reference voltage, and includes open-drain PGOOD monitoring. It is used in utility meters and remote sensors requiring long battery life and reliable regulation under wide input conditions.

For engineers reviewing the MAX17651AZT+T datasheet, MAX17651AZT+T pinout, MAX17651AZT+T application, or MAX17651AZT+T equivalent, key selection criteria include its 8μA no-load quiescent current, 560mV dropout at 100mA, -40°C to +125°C operating range, thermal shutdown at 165°C, and compatibility with all-ceramic 4.7μF output capacitors in compact TSOT packaging.

Technical Context

The MAX17651AZT+T integrates a precision 0.6V bandgap reference, current-limited pass FET driver, and thermal protection circuitry in a BiCMOS process. Its EN pin accepts logic-high signals up to VIN + 0.3V, enabling direct connection to input rails for always-on operation without level-shifting.

PGOOD asserts low when FB falls below 89% of setpoint and releases high after FB rises above 92%, providing hysteresis for stable power-good signaling. The device's internal current limit (140mA typ) and continuous short-circuit capability are coordinated with thermal shutdown (165°C trip, 15°C hysteresis) to ensure fault resilience without external components.

Key Specifications

Pinout & Package

MAX17651AZT+T is packaged in a 6-lead TSOT (Package Code Z6+1, Outline 21-0114), with exposed pad not present. Thermal resistance θ_JA = 110°C/W on a four-layer board.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage linear regulator applications.

Compared with LT3094EMSE#PBF and TPS7A4101DGNR, the MAX17651AZT+T uniquely balances 60V input, 100mA output, 8μA IQ, adjustable output, and integrated PGOOD in a single TSOT package-making it optimal for scalable, battery- and bus-powered industrial nodes requiring design reuse across voltage rails.

Availability

MAX17651AZT+T is available at Aetrix Electronics and suitable for utility meters, remote industrial sensors, and post-regulator applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MAX17651AZT+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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The MAX17651AZT+T belongs to Analog Devices' high-voltage linear regulator product line, engineered specifically for extended-battery-life and wide-input industrial power management where reliability, low IQ, and fault resilience are critical.

FAQ

What is the maximum input voltage rating for the MAX17651AZT+T?

The MAX17651AZT+T has an absolute maximum input voltage rating of +70V, with guaranteed operation across 4V to 60V. This allows safe use with 48V industrial buses, 36V battery packs, and transient-tolerant designs meeting IEC 61000-4-5 surge requirements. Exceeding 70V risks permanent damage per the Absolute Maximum Ratings table.

Does the MAX17651AZT+T require an external PGOOD pull-up resistor?

Yes, the MAX17651AZT+T features an open-drain PGOOD pin that requires an external pull-up resistor to a valid logic supply (e.g., 3.3V or 5V). The datasheet specifies PGOOD sinks 1mA when asserted low and leaks ≤1μA when high. Typical values range from 10kΩ to 100kΩ depending on rise time and bus loading requirements.

Can the MAX17651AZT+T be used with ceramic output capacitors smaller than 4.7μF?

No - the MAX17651AZT+T is specified and production-tested for stability with ≥4.7μF ceramic capacitors (0805 size) for output voltages ≥1.8V. Using smaller values may cause oscillation or poor transient response. For outputs <1.8V, a minimum 10μF ceramic capacitor is required per the Applications Information section.

What is the thermal performance difference between the TSOT and TDFN packages of the MAX17651?

The MAX17651AZT+T (TSOT) has θ_JA = 110°C/W on a four-layer board, while the TDFN variant (MAX17651ATT+T) achieves θ_JA = 42°C/W due to its exposed pad and superior thermal vias. This means the TDFN can deliver ~2.6× more continuous output current before reaching 125°C junction temperature under identical PCB layout and ambient conditions.

How does the MAX17651AZT+T handle output short-circuit conditions?

The MAX17651AZT+T incorporates internal current limiting (~140mA typical) and thermal shutdown (165°C trip). During a sustained short, it cycles on/off via thermal hysteresis (15°C), dissipating no more than safe limits. The device survives indefinite shorts without damage, provided PCB layout provides adequate heat sinking - confirmed by characterization across -40°C to +125°C ambient.