Analog Devices Inc./Maxim Integrated MAX16034PLB29+T

Overview

The MAX16034PLB29+T from Maxim Integrated is a low-power microprocessor supervisory circuit with watchdog timer, power-fail warning, and battery switchover functionality. It features a factory-set 2.93V reset threshold, active-low open-drain RESET/PFO outputs, and operates from 1.2V to 5.5V supply. Designed for portable μP systems requiring reliable brownout protection and SRAM backup, it delivers 13μA quiescent current and 140ms minimum reset timeout.

For engineers reviewing the MAX16034PLB29+T datasheet, MAX16034PLB29+T pinout, MAX16034PLB29+T application, or MAX16034PLB29+T equivalent, key selection criteria include its 1.6s watchdog timeout, -40°C to +85°C operation, 10-pin μDFN package, and compatibility with 2.5V/3.0V/3.3V/5.0V supply monitoring in battery-backed memory systems.

Technical Context

The MAX16034PLB29+T integrates a precision 1.235V reference for PFI and RESETIN comparators, a 1.6s watchdog timer with edge-triggered reset clearing, and an internal MOSFET-based battery switchover path with 40mV hysteresis. Its open-drain RESET and PFO outputs support wired-OR configurations and level-shifting interfaces.

It implements a dedicated watchdog input (WDI) that triggers reset pulses upon timeout, independent of VCC status, while maintaining full reset assertion during VCC brownout. The device asserts BATTON only in battery-backup mode and ignores MR, CEIN, and RESETIN inputs when VCC is below threshold.

Key Specifications

Pinout & Package

MAX16034PLB29+T is housed in a 10-pin, 2mm × 2mm μDFN package with exposed pad (EP), rated for -40°C to +85°C operation. The package supports reflow soldering per JEDEC J-STD-020 and features 0.5mm pitch leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX16034LLB29+T, the MAX16034PLB29+T offers system-level flexibility via open-drain outputs but requires external pull-ups; versus TPS3808G33DBVR, it delivers integrated battery management and watchdog functionality essential for data-critical embedded systems.

Availability

MAX16034PLB29+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial data loggers, retail POS terminals, and smart energy meters requiring stable component supply and long-term lifecycle support.

Supply support for MAX16034PLB29+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, mixed-signal, and power management ICs for industrial, computing, and communications markets.

The MAX16033–MAX16040 family targets μP-based systems needing integrated power supervision, battery backup, and watchdog safety - specifically engineered for space-constrained, battery-operated equipment with stringent reliability requirements.

FAQ

What is the reset threshold voltage of the MAX16034PLB29+T?

The MAX16034PLB29+T has a factory-trimmed reset threshold of 2.93V (minimum 2.85V, maximum 3.00V) with ±7mV tolerance over temperature. This value is fixed and cannot be adjusted externally. The threshold is guaranteed across the full -40°C to +85°C operating range and ensures reliable detection of 3.0V supply brownouts. The MAX16034PLB29+T uses this precise threshold to assert RESET before the μP enters undefined operation.

Does the MAX16034PLB29+T support battery backup for SRAM retention?

Yes, the MAX16034PLB29+T provides automatic battery switchover to maintain SRAM power during main supply failure. When VCC falls below 2.93V and VBATT exceeds VCC by at least 40mV, the internal MOSFET connects BATT to OUT. The device sustains OUT from battery down to 2.1V and draws only 1–2μA in backup mode (VBATT = 2.8V, VCC = 0V), enabling multi-day retention with standard coin cells. The MAX16034PLB29+T also asserts BATTON high to signal backup activation.

How does the watchdog function work on the MAX16034PLB29+T?

The MAX16034PLB29+T watchdog monitors the WDI pin and triggers a 140ms–280ms RESET pulse if WDI remains static (high or low) for longer than 1.6s (typical). Each rising or falling edge on WDI resets the timer. Unlike simple timers, the MAX16034PLB29+T watchdog clears automatically when RESET asserts, preventing cascading resets. This behavior ensures recovery from firmware hangs without manual intervention while avoiding spurious resets from noise.

Can the MAX16034PLB29+T monitor a secondary power supply?

Yes, the MAX16034PLB29+T can monitor a secondary supply using its PFI input. By connecting a resistor divider from the monitored voltage to PFI, the internal 1.235V comparator detects when the divided voltage falls below threshold - for example, a 5V rail monitored with R1=24.9kΩ and R2=10kΩ trips at 4.3V. The resulting PFO output can drive an interrupt or be connected to MR to trigger a system reset. This capability is fully supported in the MAX16034PLB29+T and requires no additional components beyond the divider.

What package type and footprint does the MAX16034PLB29+T use?

The MAX16034PLB29+T uses a 10-pin μDFN package measuring 2mm × 2mm with 0.5mm lead pitch and an exposed thermal pad. It is RoHS-compliant and lead-free (+T suffix denotes tape-and-reel packaging). The pinout matches the MAX16033–MAX16036 10-pin variants, with pins 1–10 assigned to RESET, CEIN, PFI, GND, WDI, PFO, VCC, OUT, BATT, and CEOUT respectively. This compact footprint supports high-density layouts in portable and IoT devices.