Analog Devices Inc./Maxim Integrated MAX17651ATT+

Overview

MAX17651ATT+ 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 active-low PGOOD monitoring - used in utility meters and remote sensors requiring long battery life.

For engineers reviewing the MAX17651ATT+ datasheet, MAX17651ATT+ pinout, MAX17651ATT+ application, or MAX17651ATT+ equivalent, key selection criteria include its 8μA no-load quiescent current, 560mV dropout at 100mA, thermal shutdown at 165°C, adjustable 0.6V–58V output, and compatibility with ceramic 4.7μF output capacitors in compact TDFN-EP packaging.

Technical Context

The MAX17651ATT+ implements a BiCMOS-based LDO architecture with internal 0.6V bandgap reference and precision error amplifier. Its EN pin accepts logic-high enable signals up to VIN + 0.3V, supporting direct connection to input rail for always-on operation.

It integrates analog power-good detection (92% rising / 89% falling thresholds on FB), thermal shutdown with 15°C hysteresis, and current limiting (~140mA typical). The device sustains continuous short-circuit operation while relying on junction temperature feedback to cycle regulation under sustained overload.

Key Specifications

Pinout & Package

MAX17651ATT+ is housed in a 6-pin, 3mm × 3mm TDFN-EP package with exposed pad (EP) for enhanced thermal performance. The EP must be soldered to PCB ground plane using ≥4 thermal vias for θJA = 42°C/W operation.

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 TSP50030DRVR, the MAX17651ATT+ uniquely combines 60V input capability, 100mA output, 8μA IQ, adjustable 0.6V–58V output, PGOOD, and EN in a 3mm × 3mm TDFN - enabling single-part solutions for battery longevity, flexible rail design, and robust power sequencing in harsh environments.

Availability

MAX17651ATT+ is available at Aetrix Electronics and suitable for utility metering, remote sensing, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX17651ATT+ 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 since 1965.

The MAX17651 belongs to Analog Devices' high-voltage power management portfolio, engineered specifically for ultra-low-power, wide-input industrial and battery-operated systems demanding reliability across –40°C to +125°C ambient conditions.

FAQ

What is the minimum output capacitor required for stable operation of the MAX17651ATT+?

The MAX17651ATT+ requires a minimum 4.7μF ceramic capacitor (0805 size) on the OUT pin when the output voltage is ≥1.8V. For outputs below 1.8V, a 10μF minimum is specified. These values ensure phase margin >45° and adequate load transient response per the datasheet's stability analysis. Using smaller or non-ceramic capacitors may cause oscillation or poor regulation in the MAX17651ATT+.

Does the MAX17651ATT+ support direct connection of the EN pin to the IN rail?

Yes, the MAX17651ATT+ EN pin tolerates voltages up to VIN + 0.3V, making it safe to tie directly to the IN rail for always-on operation. This eliminates external pull-up components and simplifies designs where continuous regulation is required. The EN pin draws only ±100nA leakage current, so it imposes negligible loading on the input supply in the MAX17651ATT+.

How does the PGOOD function behave during startup and fault conditions in the MAX17651ATT+?

In the MAX17651ATT+, PGOOD asserts high only after FB rises above 92% of its target value and remains high until FB falls below 89%. During startup, PGOOD stays low until regulation is achieved; during output overloads or input dips, it pulls low to signal loss of regulation. Its open-drain structure requires an external pull-up resistor, typically to the same rail as the monitored system's logic supply.

What is the maximum continuous output current achievable with the MAX17651ATT+ at 70°C ambient temperature?

At TA = +70°C, the MAX17651ATT+ in its TDFN-EP package (θJA = 42°C/W) can deliver ~69mA continuously when regulating 5V from 24V input, calculated as (125°C − 70°C) / (42°C/W × (24V − 5V)). This assumes proper thermal vias to GND and no additional board-level heating. Derating is required for higher VIN–VOUT differentials or elevated ambient temperatures in the MAX17651ATT+.

Is the exposed pad (EP) on the MAX17651ATT+ electrically connected to GND?

Yes, the exposed pad (EP) on the MAX17651ATT+ is internally connected to the GND pin and must be soldered to the PCB's ground plane. It serves both electrical and thermal functions: reducing thermal resistance by up to 3× versus non-EP packages and providing low-inductance grounding for noise-sensitive analog circuitry. Leaving EP unconnected degrades thermal performance and risks instability in the MAX17651ATT+.