Analog Devices Inc./Maxim Integrated MAX16040PLA46+T

Overview

The MAX16040PLA46+T from Maxim Integrated is an 8-pin μDFN battery-backup supervisory IC with auxiliary adjustable-reset input (RESETIN), active-low open-drain reset output, and power-fail comparator. It operates from 1.2V to 5.5V, features a factory-set 4.63V reset threshold (±0.13V), 140ms minimum reset timeout, and draws only 13µA quiescent current - enabling reliable µP reset and SRAM backup in portable POS terminals and industrial controllers.

For engineers reviewing the MAX16040PLA46+T datasheet, MAX16040PLA46+T pinout, MAX16040PLA46+T application, or MAX16040PLA46+T equivalent, key selection criteria include its 1.235V RESETIN comparator threshold, battery-switchover hysteresis (40mV), open-drain PFO/RESET outputs, and -40°C to +85°C operation in compact 2mm × 2mm package.

Technical Context

The MAX16040PLA46+T implements a precision voltage-monitoring architecture centered on dual comparators: one for VCC against a factory-trimmed 4.63V threshold (±0.13V), and another for RESETIN against a stable 1.235V internal reference (±50mV). Its battery switchover logic activates when VCC falls below both the reset threshold and VBATT by ≥40mV, routing BATT to OUT via a low-R_ON MOSFET (≤4.6Ω at 2.5V).

It integrates a dedicated RESETIN path with 1.5µs propagation delay (V_RTH ±100mV), independent of VCC monitoring, allowing secondary supply supervision without affecting primary reset timing. The open-drain RESET and PFO outputs support wired-OR configurations and are valid down to VCC = 1.2V, ensuring robust assertion during brownout.

Key Specifications

Pinout & Package

MAX16040PLA46+T uses an 8-pin µDFN package (2mm × 2mm, 0.5mm pitch) with exposed thermal pad. Pin 1 is marked by dot; pin numbering follows standard counter-clockwise sequence from top-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory circuit applications.

Compared with MAX16036PLA46+T, the MAX16040PLA46+T omits chip-enable gating but reduces board area by 20% and eliminates unused pins that could cause ESD susceptibility; versus TPS3808G33DBVR, it adds critical RESETIN flexibility and true battery switchover - making it the only option for portable equipment requiring SRAM retention across multiple supply domains.

Availability

MAX16040PLA46+T is available at Aetrix Electronics and suitable for portable POS terminals, industrial controllers, set-top boxes, and portable medical instruments requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.

Supply support for MAX16040PLA46+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 and mixed-signal ICs for power management, sensing, and interface applications - serving industrial, automotive, and communications markets since 1983.

The MAX16033–MAX16040 family was engineered specifically for space-constrained, battery-critical µP systems needing integrated reset, power-fail warning, and seamless battery switchover - targeting portable instrumentation and industrial edge nodes.

FAQ

What is the exact reset threshold voltage for MAX16040PLA46+T?

The MAX16040PLA46+T has a factory-set reset threshold of 4.63V, with guaranteed minimum 4.50V and maximum 4.75V across -40°C to +85°C. This value is laser-trimmed during production and applies specifically to the "46" suffix variant - confirmed in the Electrical Characteristics table under "MAX160_ _ _L_46" row.

Does MAX16040PLA46+T support battery switchover, and what is the hysteresis?

Yes, MAX16040PLA46+T supports automatic battery switchover: when VCC falls below both the 4.63V reset threshold and VBATT by ≥40mV, OUT disconnects from VCC and connects to BATT. The 40mV hysteresis prevents oscillation during slow VCC decay - explicitly defined in the "Battery-Switchover Threshold" parameter (VSW) section.

What is the function of the RESETIN pin on MAX16040PLA46+T?

The RESETIN pin on MAX16040PLA46+T is a dedicated auxiliary reset input referenced to a precise 1.235V internal comparator. When voltage at RESETIN falls below 1.235V (±50mV), it asserts RESET independently of VCC monitoring - enabling supervision of secondary supplies like 3.3V or 2.5V rails using an external resistor divider.

Is MAX16040PLA46+T pin-compatible with other devices in the MAX16033–MAX16040 family?

No - MAX16040PLA46+T uses an 8-pin µDFN package, while variants like MAX16033/MAX16036 use 10-pin µDFN. Pin functions differ: MAX16040PLA46+T lacks CEIN/CEOUT and MR pins present in 10-pin versions. The "40" suffix denotes 8-pin configuration with RESETIN and open-drain outputs - not a drop-in replacement.

What are the absolute maximum ratings for VCC and BATT on MAX16040PLA46+T?

Per Absolute Maximum Ratings, VCC and BATT each tolerate -0.3V to +6V with respect to GND. Continuous VCC current is rated at 250mA; peak VCC current is 1A. BATT continuous current is 40mA, peak is 250mA. Exceeding these limits risks permanent damage - these values are measured at the pins, not derived from typical operating conditions.