Analog Devices Inc./Maxim Integrated MAX16036PLB46+T

Overview

The MAX16036PLB46+T from Maxim Integrated is a low-power, 10-pin μDFN supervisory circuit designed for microprocessor power monitoring and battery switchover in portable systems. It features an auxiliary adjustable-reset input (RESETIN), active-low open-drain reset output, 4.63V factory-set reset threshold, 140ms minimum reset timeout, and operates from 1.2V to 5.5V supply. It enables reliable SRAM backup during brownout in POS terminals and set-top boxes.

For engineers reviewing the MAX16036PLB46+T datasheet, MAX16036PLB46+T pinout, MAX16036PLB46+T application, or MAX16036PLB46+T equivalent, key selection criteria include its 1.235V RESETIN comparator threshold, 13µA quiescent current, battery-switchover hysteresis, chip-enable gating capability (shared with MAX16033–MAX16036), and compatibility with 2.5V/3.0V/3.3V/5.0V supply rails.

Technical Context

The MAX16036PLB46+T implements a precision voltage-monitoring architecture with dual independent comparators: one for VCC reset detection (4.63V threshold) and another for external RESETIN monitoring (1.235V reference). Its internal MOSFET-based battery switchover path provides <4.6Ω VCC-to-OUT on-resistance at 2.5V and supports up to 200mA load current.

It integrates chip-enable gating logic (CEIN/CEOUT) with 2ns typical propagation delay, 100Ω on-resistance, and 1µs reset-to-CEOUT hold timing-designed to prevent CMOS RAM corruption during power failure. The device uses a fixed 140ms reset timeout and supports open-drain RESET/PFO outputs with 1µA leakage and 0.4V VOL at 1.6mA sink.

Key Specifications

Pinout & Package

Package: 10-pin µDFN (2mm × 2mm, 0.5mm pitch), -40°C to +85°C operating range, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16036LLB46+T, the MAX16036PLB46+T offers greater interface flexibility via open-drain outputs but requires external pull-ups; versus TPS3808G33DBVR, it delivers full battery-backup functionality and CE gating-critical for SRAM retention in mission-critical embedded systems.

Availability

MAX16036PLB46+T is available at Aetrix Electronics and suitable for POS terminals, set-top boxes, industrial controllers, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.

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

The MAX16033–MAX16040 family targets compact, low-power µP supervisory functions-specifically engineered for battery-backed SRAM retention, brownout immunity, and multi-rail monitoring in portable and embedded systems.

FAQ

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

The MAX16036PLB46+T has a factory-set reset threshold of 4.63V (typical), with guaranteed range 4.50V to 4.75V over temperature. This value is laser-trimmed during production and applies specifically to the "46" suffix variant. The threshold remains stable across -40°C to +85°C with <0.3% drift, ensuring consistent reset behavior for 5.0V system rails.

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

Yes, the MAX16036PLB46+T supports automatic battery switchover from VCC to BATT when VCC falls below the reset threshold and VBATT exceeds VCC by at least 40mV. This 40mV hysteresis prevents oscillation during slow VCC decay and is implemented in hardware-no external components required. The device sustains OUT from BATT with <1µA quiescent draw when VCC = 0V.

What is the function of the RESETIN pin on the MAX16036PLB46+T, and what voltage does it trigger at?

The RESETIN pin on the MAX16036PLB46+T is a dedicated auxiliary reset input that asserts the main RESET output when its voltage falls below 1.235V (±50mV). It uses an internal precision bandgap reference and draws only 25nA max input current, enabling accurate monitoring of secondary supplies (e.g., 3.3V or 2.5V rails) using a simple resistor divider network.

Can the MAX16036PLB46+T be used without a backup battery?

Yes, the MAX16036PLB46+T operates normally without a backup battery: connect BATT to GND and route VCC directly to OUT. All supervisory functions-including VCC reset, RESETIN monitoring, PFI/PFO, and CE gating-remain fully functional. The device will not enter battery-backup mode, and OUT behaves as a regulated pass-through of VCC with no switchover action.

What are the key differences between the 'P' and 'L' suffix variants of the MAX16036 series?

The 'P' suffix (e.g., MAX16036PLB46+T) denotes open-drain RESET and PFO outputs, requiring external pull-up resistors for logic-level definition. The 'L' suffix (e.g., MAX16036LLB46+T) provides push-pull outputs capable of actively driving high/low without external components. Both share identical reset thresholds, timing, and functional blocks-only the output stage architecture differs.