Analog Devices Inc./Maxim Integrated MAX16043TG+

Overview

MAX16043TG+ from Maxim Integrated is a quad-voltage supervisor and sequencer in a 24-pin TQFN package, monitoring four independent supply rails (IN1–IN4) with adjustable or fixed thresholds (0.5V to 3.3V), open-drain outputs (up to 28V tolerant), and capacitor-adjustable timing for power-up sequencing in multivoltage systems. It delivers push-pull RESET with 140ms minimum timeout and operates across –40°C to +125°C.

For engineers reviewing the MAX16043TG+ datasheet, MAX16043TG+ pinout, MAX16043TG+ application, or MAX16043TG+ equivalent, this device supports precise voltage monitoring, daisy-chainable sequencing, manual reset, tolerance-selectable thresholds (5%/10%), and integration with DC-DC enable inputs in high-reliability embedded and industrial power systems.

Technical Context

The MAX16043TG+ implements four independent comparator-based monitor channels, each with logic-selectable threshold (via TH1/TH0), tolerance selection (TOL), and enable control (EN1–EN4). Each channel drives an open-drain output (OUT1–OUT4) with propagation delay (≤35µs) and capacitor-adjustable delay (CDLY1–CDLY4).

Its push-pull RESET output asserts low on any monitored voltage drop, ENx deactivation, or MR assertion, and deasserts only after all four voltages exceed thresholds, all ENx are high, and the reset timeout (fixed or CRESET-set) expires. Internal reference accuracy is 1.5% for adjustable thresholds and 2.7% over temperature for fixed thresholds.

Key Specifications

Pinout & Package

MAX16043TG+ uses a 24-pin thin QFN (TQFN) package measuring 4mm × 4mm with an exposed thermal pad connected internally to GND. Pin numbering follows standard top-view orientation with Pin 1 at top-left corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-voltage supervisory applications.

Compared with TPS3307-33DGNR and ADM1266ASTZ, the MAX16043TG+ uniquely balances hardware-configurable quad monitoring, capacitor-based timing, and wide VCC range (2.2V–28V) in a compact 4mm × 4mm package - making it optimal for space-constrained, high-reliability multivoltage systems where firmware-free operation is required.

Availability

MAX16043TG+ is available at Aetrix Electronics and suitable for server power sequencing, industrial PLC I/O modules, telecom line cards, and automotive ADAS ECUs requiring stable component supply across extended temperature and long product lifecycles.

Supply support for MAX16043TG+ 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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX16043TG+ belongs to Maxim's high-accuracy supervisory IC family, engineered specifically for robust, capacitor-programmable power sequencing and voltage monitoring in multirail systems operating across harsh temperature and voltage ranges.

FAQ

What is the maximum input voltage the MAX16043TG+ can monitor on its INx pins?

The MAX16043TG+ INx pins tolerate voltages from –0.3V to (VCC + 0.3V), meaning the absolute maximum monitored voltage depends on VCC. With VCC = 28V, INx may safely monitor up to 28.3V. However, internal threshold comparators are optimized for 0.5V–3.3V nominal rails; higher voltages require external resistive dividers per the datasheet's Figure 3 network.

Can the MAX16043TG+ be used in a system with only three supply rails?

Yes - the MAX16043TG+ supports partial use of its four monitoring channels. Unused INx and ENx pins must be tied to VCC per datasheet guidance (page 9), and unused CDLYx pins left open. The device operates correctly with one to four active rails, retaining full functionality for enabled channels including RESET assertion logic and capacitor-adjustable delays.

How does the TOL pin affect threshold accuracy on the MAX16043TG+?

The TOL pin selects threshold tolerance: tied to GND yields ±5% of nominal voltage (e.g., 3.3V ±5% = 3.135V), while tied to VCC yields ±10% (e.g., 3.3V ±10% = 2.97V). This setting applies uniformly across all fixed thresholds (3.3V, 2.5V, etc.) and adjusts the reference for adjustable monitors (0.5V ±5% or ±10%). Leaving TOL unconnected is not permitted.

What is the minimum VCC required for the MAX16043TG+ to maintain valid output states?

The MAX16043TG+ guarantees correct output states down to VCC = 1.2V, though undervoltage lockout (UVLO) activates at ~1.9V (min). Below UVLO, all outputs go low and remain low until VCC rises above UVLO. For reliable RESET sinking near 0V, the datasheet recommends a 100kΩ pull-down from RESET to GND to ensure valid logic levels during full power collapse.

Does the MAX16043TG+ support daisy-chaining for cascaded power sequencing?

Yes - the MAX16043TG+ supports hardware daisy-chaining: OUTx of one device can drive ENy of another to enforce strict power-up order. For example, OUT1 of Device A enables EN1 of Device B, ensuring Device B's monitoring starts only after Device A confirms its first rail is stable. This eliminates need for external logic or microcontroller coordination.