Analog Devices Inc./Maxim Integrated MAX17651ATT+T

Overview

The MAX17651ATT+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 load current, consumes only 8μA quiescent current at no load, features ±2% feedback voltage accuracy over temperature, and includes an open-drain PGOOD pin for output monitoring - used in utility meters and remote sensors requiring long-term standby operation.

For engineers reviewing the MAX17651ATT+T datasheet, MAX17651ATT+T pinout, MAX17651ATT+T application, or MAX17651ATT+T equivalent, key selection criteria include its 0.6V–58V adjustable output, 560mV dropout at 100mA, thermal shutdown at 165°C, EN pin with 2V rising threshold, and compatibility with compact 3mm × 3mm TDFN-EP packaging.

Technical Context

The MAX17651ATT+T implements a BiCMOS-based LDO architecture with internal 0.6V bandgap reference and precision error amplifier. Its feedback loop regulates output via external resistor divider on FB, enabling programmable output from 0.6V to 58V with ±2% accuracy across –40°C to +125°C ambient.

It integrates active-high EN control tolerant up to VIN + 0.3V, open-drain PGOOD with 89.5–94.5% VFB threshold hysteresis, and thermal protection that cycles output when junction exceeds 165°C (15°C hysteresis). Short-circuit current limit is typ. 140mA, supporting indefinite GND shorts without damage.

Key Specifications

Pinout & Package

MAX17651ATT+T is packaged in a 6-pin, 3mm × 3mm TDFN-EP (exposed pad) package optimized for thermal performance on multilayer PCBs (θJA = 42°C/W). The exposed pad must be soldered to a solid GND plane with ≥4 thermal vias for reliable 100mA operation at elevated ambient temperatures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT3015EDD#PBF and TPS7A4101RDAR, the MAX17651ATT+T uniquely combines 0.6V–58V adjustability, 8μA IQ, and 3mm × 3mm TDFN thermal efficiency - making it optimal for battery-backed utility meters and multi-rail industrial sensors where output flexibility and ultra-low standby loss are mandatory.

Availability

MAX17651ATT+T is available at Aetrix Electronics and suitable for utility meters, remote industrial sensors, post-regulator for switching power supplies, and low-current industrial power supplies requiring stable component supply across extended product lifecycles.

Supply support for MAX17651ATT+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 MAX17651ATT+T belongs to Analog Devices' high-voltage linear regulator product line, engineered specifically for long-life, wide-input industrial and battery-operated systems demanding ultra-low quiescent current and robust fault protection.

FAQ

What is the maximum output voltage supported by the MAX17651ATT+T?

The MAX17651ATT+T supports an adjustable output voltage range from 0.6V to 58V, set via an external resistor divider on the FB pin using the internal 0.6V reference. This range accommodates common system rails including 3.3V, 5V, 12V, 24V, and 48V, with ±2% accuracy maintained over the full –40°C to +125°C operating temperature range.

Does the MAX17651ATT+T require an external capacitor on the IN pin?

Yes, the MAX17651ATT+T requires a 0.1µF ceramic capacitor placed directly between the IN pin and GND, located as close as possible to the device. This capacitor stabilizes the input supply and suppresses high-frequency noise from upstream sources such as switching regulators - critical for maintaining PGOOD accuracy and preventing false shutdowns.

How does the PGOOD pin function on the MAX17651ATT+T?

The PGOOD pin on the MAX17651ATT+T is an open-drain, active-low output that signals valid regulation. It pulls low when the FB voltage drops below 89.5% of its target value and goes high when FB rises above 92% - providing 2.5% hysteresis. An external pull-up resistor (typically 10kΩ to 3.3V or 5V) is required; the pin can be left floating if unused.

Can the MAX17651ATT+T operate with ceramic output capacitors only?

Yes, the MAX17651ATT+T is fully stable with all-ceramic output capacitors. For outputs ≥1.8V, a minimum 4.7µF, 0805-case ceramic capacitor is required; for outputs <1.8V, a minimum 10µF, 0805 ceramic capacitor is recommended. No ESR requirements or tantalum/Al-elec alternatives are needed - enabling compact, high-reliability layouts.

What thermal considerations apply to the MAX17651ATT+T in the TDFN package?

The MAX17651ATT+T in the 3mm × 3mm TDFN-EP package has θJA = 42°C/W on a four-layer board. To avoid exceeding the 125°C maximum junction temperature, the exposed pad (EP) must be soldered to a large GND plane with ≥4 thermal vias. At 100mA load with VIN = 24V and VOUT = 5V, power dissipation is 1.9W - requiring careful thermal layout to keep TJ ≤ 125°C at 70°C ambient.