Analog Devices Inc./Maxim Integrated MAX16040PLA46+

Overview

MAX16040PLA46+ from Maxim Integrated is an 8-pin μDFN battery-backup supervisory IC for microprocessor systems, featuring auxiliary adjustable-reset input (RESETIN), active-low open-drain reset output, power-fail comparator with 1.235V threshold, and battery switchover control. It operates from 1.2V to 5.5V supply, draws only 13µA quiescent current, and asserts reset for ≥140ms after VCC recovery. Used in POS terminals and real-time clocks requiring reliable brownout protection.

For engineers reviewing the MAX16040PLA46+ datasheet, MAX16040PLA46+ pinout, MAX16040PLA46+ application, or MAX16040PLA46+ equivalent, key selection criteria include its 1.235V RESETIN threshold, 4.63V factory-set VTH, 8-pin μDFN-8 package, open-drain reset structure, and battery switchover hysteresis of 40mV - all critical for low-power SRAM backup and secondary supply monitoring.

Technical Context

The MAX16040PLA46+ implements a precision voltage-monitoring architecture centered on dual comparators: one for VCC against a factory-trimmed 4.63V reset threshold (±130mV tolerance), and another for the user-configurable RESETIN input referenced to an internal 1.235V bandgap. Its battery switchover logic uses analog MOSFET control with 40mV hysteresis between VCC and BATT to prevent oscillation during slow voltage transitions.

This variant belongs to the MAX16033–MAX16040 family's 8-pin μDFN configuration and specifically includes the RESETIN function (pin 5), omitting CEIN/CEOUT and MR/WDI found in 10-pin variants. It supports only open-drain RESET and PFO outputs (denoted by "P" in part number), and operates across –40°C to +85°C with guaranteed performance down to 1.2V supply.

Key Specifications

Pinout & Package

MAX16040PLA46+ is housed in an 8-pin, 2mm × 2mm, 0.5mm-pitch μDFN package with exposed pad (EP). Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise convention starting from top-left corner when marking is oriented upright.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16036PLA46+, MAX16040PLA46+ saves board space and cost by removing unused CE gating, while retaining identical reset accuracy and battery control. Against TPS3808G33DBVR, it delivers three additional functional domains - backup switchover, auxiliary voltage monitoring, and power-fail warning - making it irreplaceable in SRAM-retention-critical designs.

Availability

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

Supply support for MAX16040PLA46+ 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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications, with emphasis on reliability and integration density.

The MAX16033–MAX16040 product line targets compact, low-power microprocessor supervisory functions - specifically engineered for battery-backed memory retention, brownout immunity, and multi-rail voltage monitoring in space-constrained embedded systems.

FAQ

What is the factory-set reset threshold voltage for MAX16040PLA46+?

The MAX16040PLA46+ has a factory-set reset threshold voltage (VTH) of 4.63V, with guaranteed minimum and maximum values of 4.50V and 4.75V respectively over temperature. This value is laser-trimmed during production and applies specifically to the "L_46" suffix in the part number. The threshold remains stable across –40°C to +85°C with normalized drift ≤±0.3%.

How does the RESETIN input function in MAX16040PLA46+?

The RESETIN input in MAX16040PLA46+ compares an external voltage against an internal 1.235V reference. When the voltage at RESETIN falls below this threshold, MAX16040PLA46+ asserts the RESET output for at least 140ms. It draws ≤25nA input current, enabling use of high-value resistor dividers (e.g., 1MΩ) for monitoring 3.3V or 5V auxiliary rails without loading errors.

Can MAX16040PLA46+ operate with a 1.2V supply?

Yes, MAX16040PLA46+ is fully operational down to 1.2V VCC supply voltage. Its active-low reset output remains valid at 1.2V (VOL ≤0.4V at 100µA sink), and internal comparators maintain specification. However, battery switchover requires VBATT > VCC + 40mV, so BATT must exceed 1.24V to engage backup mode at minimum VCC.

What package type and dimensions does MAX16040PLA46+ use?

MAX16040PLA46+ uses an 8-pin µDFN package measuring 2.0mm × 2.0mm with 0.5mm pin pitch and an exposed thermal pad. It complies with JEDEC MO-229 and is RoHS-compliant (lead-free). The package supports reflow soldering per J-STD-020 and requires GND connection of the exposed pad for optimal thermal performance and EMI reduction.

Does MAX16040PLA46+ support both push-pull and open-drain reset outputs?

No, MAX16040PLA46+ supports only open-drain RESET and PFO outputs, as indicated by the "P" in its part number suffix. It does not include the push-pull option (denoted by "L"). External pull-up resistors are required on both RESET and PFO lines; typical values range from 10kΩ to 100kΩ depending on bus capacitance and rise-time requirements.