Analog Devices Inc./Maxim Integrated MAX16037LLA31+T

Overview

The MAX16037LLA31+T from Maxim Integrated is an 8-pin μDFN low-power supervisory circuit for microprocessor systems, featuring debounced manual-reset input (MR), active-low push-pull reset output, 3.08V factory-set reset threshold, 140ms minimum reset timeout, and battery switchover control - used to maintain SRAM integrity during brownout in portable POS terminals.

For engineers reviewing the MAX16037LLA31+T datasheet, MAX16037LLA31+T pinout, MAX16037LLA31+T application, or MAX16037LLA31+T equivalent, key selection criteria include reset threshold accuracy (±7mV over temperature), VCC-to-RESET propagation delay (<120ns), battery-backup quiescent current (≤2µA at −40°C to +85°C), and MR input glitch immunity (100ns at 3.3V).

Technical Context

The MAX16037LLA31+T implements a precision bandgap-based reset generator with hysteresis, integrated MOSFET-controlled battery switchover path, and debounced MR input with internal 20kΩ pullup. It operates across 1.2V–5.5V supply range and asserts reset when VCC falls below 3.08V or MR is driven low.

Its architecture includes independent power-fail comparator (PFI threshold = 1.235V ±50mV), active-low push-pull RESET output capable of sinking 20mA, and OUT pin that sources from VCC or BATT depending on voltage comparison with 40mV hysteresis - all fully specified from −40°C to +85°C.

Key Specifications

Pinout & Package

MAX16037LLA31+T is housed in a space-saving 2mm × 2mm, 8-pin µDFN package with exposed pad (EP), optimized for high-density PCB layouts and thermal performance in compact portable equipment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16033LLA31+T, the MAX16037LLA31+T saves board space via 8-pin footprint and removes unused CE gating, while retaining identical reset accuracy and battery control. Versus TPS3808G33DBVR, it provides integrated switchover and MR-eliminating ≥4 discrete components in backup-critical designs.

Availability

MAX16037LLA31+T is available at Aetrix Electronics and suitable for portable POS terminals, industrial controllers, set-top boxes, and real-time clock modules requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.

Supply support for MAX16037LLA31+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 in industrial, computing, and consumer systems.

The MAX16033–MAX16040 family was developed to replace discrete reset/battery-control solutions in space-constrained µP systems - delivering integrated supervision, switchover, and fault signaling in sub-4mm² packages.

FAQ

What is the factory-set reset threshold voltage for MAX16037LLA31+T?

The MAX16037LLA31+T has a factory-trimmed reset threshold of 3.08V (typical), with guaranteed range of 3.00V to 3.15V over −40°C to +85°C. This value is laser-trimmed during production and does not require external resistor configuration - making it ideal for 3.0V/3.3V systems where precise brownout detection is critical. The 'A31' suffix explicitly denotes this 3.08V threshold variant.

Does MAX16037LLA31+T support battery switchover without external MOSFETs?

Yes, MAX16037LLA31+T integrates bidirectional MOSFET switches for automatic VCC/BATT switchover on the OUT pin. When VCC falls below the reset threshold and VBATT exceeds VCC by ≥40mV, the internal switch connects BATT to OUT - delivering up to 200mA with typical on-resistance of 4.6Ω at 2.5V. No external FETs, diodes, or control logic are needed.

What is the function of the MR pin on MAX16037LLA31+T?

The MR (Manual Reset) pin on MAX16037LLA31+T is a debounced, internally pulled-up (20kΩ min) input that asserts RESET when driven low. It remains asserted for ≥140ms after MR returns high, ensuring reliable µP reset initiation from front-panel buttons or system logic. Unlike many supervisors, MAX16037LLA31+T requires no external debounce components - reducing BOM cost and PCB area.

Can MAX16037LLA31+T monitor a secondary power rail using PFI?

Yes, MAX16037LLA31+T's PFI pin accepts a divided-down version of any positive supply (e.g., 5V, 12V) via external resistors. Its internal 1.235V comparator triggers PFO when the divided voltage falls below threshold - enabling early power-fail warning. The PFI input draws only ±100nA, so resistor values up to 1MΩ can be used without accuracy loss.

What package type and dimensions does MAX16037LLA31+T use?

MAX16037LLA31+T uses a 2mm × 2mm, 8-pin µDFN package with exposed pad (EP), compliant with JEDEC MO-229 standard. Pin pitch is 0.5mm, and total height is 0.55mm max - enabling ultra-compact placement in portable and wearable electronics. The EP improves thermal dissipation and provides low-inductance ground connection.