Analog Devices Inc./Maxim Integrated MAX16166AWPH+

Overview

MAX16166AWPH+ from Analog Devices is a highly integrated 4-channel power-supply sequencer and supervisor IC with push-pull outputs, operating from 2.7V to 16V, featuring capacitor-adjustable sequencing delay (tDLY), resistor-configurable voltage thresholds (0.5V nominal), and bidirectional FAULT I/O. It enables FPGA/ASIC multi-rail power-up in precise order while monitoring five voltages including VDD and providing POK and DONE signals for microcontroller reset coordination.

For engineers reviewing the MAX16166AWPH+ datasheet, MAX16166AWPH+ pinout, MAX16166AWPH+ application, or MAX16166AWPH+ equivalent, this device supports daisy-chained sequencing of unlimited supplies, reverse-order power-down, latch-up prevention in multi-supply systems, and industrial-grade operation from –40°C to +125°C - critical for server, security camera, and networking equipment design.

Technical Context

The MAX16166AWPH+ implements a deterministic state-machine-based sequencing controller with four independent output channels (OUT1–OUT4), each triggered by rising/falling thresholds on dedicated SET_ inputs (0.5V reference). Power-on sequencing initiates on a rising edge at ON, enabling outputs sequentially after tDLY and verifying each rail reaches threshold within tPGT before proceeding.

During power-off, a falling edge at OFF triggers reverse-order disabling with resistor-programmable offset current (IOFFSET = 0.5μA–50μA) injected into SET_ pins to ensure clean voltage decay detection. The FAULT pin operates as a bidirectional active-low signal: internally asserted during UV, timeout, or threshold violation; externally pulled low to force immediate shutdown and initialization.

Key Specifications

Pinout & Package

MAX16166AWPH+ is packaged in a 4mm × 4mm, 20-pin TQFN (Package Code T2044+3C) with exposed pad (EP) connected internally to GND for thermal management. Pinout matches the MAX16166 variant in the datasheet.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar power-supply sequencing applications.

Compared with MAX16165AWPH+, the MAX16166AWPH+ eliminates external pull-up components and simplifies layout; versus TPS65400RGER, it offers wider input range, higher channel count, and modular scalability - making it optimal for complex, high-reliability power architectures.

Availability

MAX16166AWPH+ is available at Aetrix Electronics and suitable for FPGA/ASIC power sequencing, server board design, and industrial sensor node development requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for MAX16166AWPH+ 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 precision instrumentation, industrial automation, communications, and automotive markets.

The MAX16166AWPH+ belongs to Analog Devices' power-supply supervisory and sequencing product line, designed specifically for robust, flexible, and scalable management of multi-rail systems in harsh thermal and electrical environments.

FAQ

What is the function of the ABP pin on the MAX16166AWPH+?

The ABP pin on the MAX16166AWPH+ is the output of an internal linear regulator, delivering a stable 2.45V to 3.20V supply that powers internal circuitry and can source more than 1mA to external components. It must be bypassed with a 1μF capacitor to GND and must never be left floating or shorted - doing so prevents proper operation of the MAX16166AWPH+ and may cause sequencing failure or latch-up.

How does the MAX16166AWPH+ handle power-off sequencing?

The MAX16166AWPH+ performs reverse-order power-off sequencing triggered by a falling edge on the OFF pin. It disables outputs OUT4 → OUT3 → OUT2 → OUT1 with tDLY delay between each step, injecting a resistor-programmable offset current (via IOS) into each SET_ pin to ensure reliable detection of rail collapse. This prevents back-powering and ensures safe deactivation of downstream circuitry in the MAX16166AWPH+ controlled system.

Can the MAX16166AWPH+ monitor more than four voltage rails?

Yes - the MAX16166AWPH+ monitors up to five voltage rails: four via SET1–SET4 inputs and one additional rail via the UVSET input (e.g., VDD or auxiliary supply). Each SET_ input has a precise 0.5V threshold with 1% hysteresis, and UVSET provides undervoltage lockout monitoring with separate hysteresis - all verified across the full –40°C to +125°C range in the MAX16166AWPH+ specification.

What is the role of the FAULT pin on the MAX16166AWPH+?

The FAULT pin on the MAX16166AWPH+ is a bidirectional active-low signal: it asserts low during internal faults (e.g., UV, timeout, threshold violation) and responds to external low signals by immediately disabling all outputs and resetting the state machine. During non-UV faults, it outputs an 80μs (typ) one-shot pulse; during UVSET faults, it remains latched low until the condition clears - ensuring fail-safe behavior in the MAX16166AWPH+ application.

Is the MAX16166AWPH+ pin-compatible with other members of the MAX16165/MAX16166 family?

Yes - the MAX16166AWPH+ shares identical pinout, package (20L TQFN), and footprint with MAX16165AWPH+ and all variants in the MAX16165/MAX16166 family. The only functional difference is output driver type: MAX16166AWPH+ uses push-pull outputs, while MAX16165AWPH+ uses open-drain. No PCB changes are required when substituting MAX16166AWPH+ for MAX16165AWPH+ in existing layouts.