Analog Devices Inc./Maxim Integrated MAX16036PLB46+

Overview

MAX16036PLB46+ from Maxim Integrated is a low-power microprocessor supervisory circuit with auxiliary adjustable-reset input (RESETIN), active-low open-drain reset output, and battery switchover functionality. It operates from 1.2V to 5.5V, features a factory-set 4.63V reset threshold (L46 variant), 140ms minimum reset timeout, and 13µA quiescent supply current. It is used in portable equipment and industrial controllers for reliable power monitoring and SRAM backup during brownout.

For engineers reviewing the MAX16036PLB46+ datasheet, MAX16036PLB46+ pinout, MAX16036PLB46+ application, or MAX16036PLB46+ equivalent, key selection criteria include its 1.235V RESETIN comparator threshold, 10-pin µDFN package, open-drain reset structure, battery switchover hysteresis, and compatibility with 3.3V/5V µP systems requiring precise secondary supply monitoring.

Technical Context

The MAX16036PLB46+ implements a dedicated RESETIN comparator referenced to an internal 1.235V bandgap, enabling user-adjustable reset triggering via external resistor divider on the RESETIN pin. It integrates a precision power-fail comparator (PFI/PFO) and supports battery-backed SRAM retention by switching OUT from VCC to BATT when VCC falls below the 4.63V threshold and VBATT exceeds VCC by ≥40mV.

It provides active-low open-drain RESET and PFO outputs, supports manual reset assertion only via RESETIN (not MR or WDI), and includes chip-enable gating logic (CEIN/CEOUT) for preventing erroneous writes during power failure. All functions operate across –40°C to +85°C with guaranteed timing and voltage thresholds.

Key Specifications

Pinout & Package

MAX16036PLB46+ is housed in a 10-pin, 2mm × 2mm µDFN package with wettable flanks, rated for –40°C to +85°C operation. Pin 1 is marked with a dot; pin numbering follows standard counter-clockwise convention from the mark.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16036LLB46+, the MAX16036PLB46+ offers greater flexibility in reset signaling but requires external pull-up design; versus TPS3808G33DBVR, it delivers dual-supply monitoring and battery backup-critical for data-retentive systems-but occupies larger area and costs more.

Availability

MAX16036PLB46+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLCs, set-top boxes, and POS terminals requiring stable component supply with long-term lifecycle support and RoHS-compliant packaging.

Supply support for MAX16036PLB46+ 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 connectivity in demanding industrial and portable applications.

The MAX16033–MAX16040 family was engineered to replace discrete supervisory circuits in µP systems, integrating reset, battery switchover, power-fail warning, and chip-enable gating into compact µDFN packages for space- and power-constrained designs.

FAQ

What is the factory-set reset threshold voltage for MAX16036PLB46+?

The MAX16036PLB46+ has a factory-set reset threshold of 4.63V (L46 variant), specified over –40°C to +85°C with ±130mV tolerance. This value is laser-trimmed during production and applies to VCC falling edge detection. The threshold remains stable across temperature, with normalized variation ≤±0.3% from –40°C to +85°C per the Typical Operating Characteristics graph (toc07).

Does MAX16036PLB46+ support battery switchover, and what is the hysteresis?

Yes, MAX16036PLB46+ supports automatic battery switchover from VCC to BATT when VCC falls below 4.63V and VBATT exceeds VCC by at least 40mV. This 40mV hysteresis is built-in and prevents chattering during slow VCC decay. In battery-backup mode, OUT is sourced from BATT, and RESET remains asserted until VCC recovers above 4.63V and stabilizes for ≥140ms.

What is the function of the RESETIN pin on MAX16036PLB46+?

The RESETIN pin on MAX16036PLB46+ is a user-adjustable reset input referenced to an internal 1.235V comparator. When the voltage at RESETIN falls below 1.235V, MAX16036PLB46+ asserts RESET. It is typically used with a resistor divider to monitor secondary supplies (e.g., 3.3V, 2.5V). Input current is ≤25nA, allowing use of high-value resistors (up to 1MΩ) without accuracy loss.

What are the electrical characteristics of the open-drain RESET output on MAX16036PLB46+?

The RESET output on MAX16036PLB46+ is active-low open-drain, with leakage current ≤1µA when not asserted and VOL ≤0.4V at ISINK = 100µA (VCC > 1.2V). It requires an external pull-up resistor to a valid logic rail (e.g., VCC or µP I/O voltage). The output is fully specified from –40°C to +85°C and supports interoperability with 1.8V–5V µP reset inputs.

Is MAX16036PLB46+ compatible with supercapacitor backup sources?

Yes, MAX16036PLB46+ is compatible with supercapacitor backup sources. Its BATT input accepts voltages up to 5.5V, and the 40mV switchover hysteresis prevents oscillation during gradual discharge. When using a supercap, connect it to BATT through a series diode (e.g., 1N4148) to avoid reverse current; the device draws only ≤2µA from BATT in backup mode (VBATT = 2.8V, TA = –40°C to +85°C), enabling multi-hour retention.