Texas Instruments TPS3828-50DBVRG4

Overview

TPS3828-50DBVRG4 from Texas Instruments is a 5V-supply voltage supervisor IC with open-drain active-low reset output, integrated watchdog timer (1.6s timeout), manual reset input, and 200ms reset delay. It monitors VDD for undervoltage conditions, asserts RESET when VDD falls below 4.49V (min), and supports microcontroller-based systems requiring reliable power-on initialization and fault recovery. Designed for industrial control and embedded applications where supply stability and system-level fault detection are critical.

For engineers reviewing the TPS3828-50DBVRG4 datasheet, TPS3828-50DBVRG4 pinout, TPS3828-50DBVRG4 application, or TPS3828-50DBVRG4 equivalent, key selection criteria include its 4.55V nominal threshold voltage, open-drain output compatibility with wired-OR configurations, watchdog timeout tolerance (±0.9s), −40°C to 85°C operating range, and SOT-23-5 package footprint constraints.

Technical Context

The TPS3828-50DBVRG4 implements a fixed-threshold supervision architecture with internal voltage divider setting VIT− = 4.55V (nominal) and hysteresis of 50mV. Its watchdog timer requires periodic falling-edge transitions on WDI to prevent timeout; absence triggers a 200ms reset pulse. The device uses an internal oscillator and transition detector to manage reset assertion timing independent of external components.

Unlike push-pull variants (e.g., TPS3823), the open-drain RESET output enables direct connection to shared reset buses and supports level-shifting via external pull-up. Manual reset (MR) forces immediate reset regardless of VDD state, and internal 90kΩ MR pull-up eliminates need for external biasing when unused.

Key Specifications

Pinout & Package

TPS3828-50DBVRG4 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for space-constrained PCB layouts and compatible with standard pick-and-place assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervision applications.

Compared with TPS3823-50DBVR, TPS3828-50DBVRG4 enables shared reset busing but requires external pull-up; compared with MAX6326–T50, it adds watchdog capability essential for autonomous recovery in unattended devices.

Availability

TPS3828-50DBVRG4 is available at Aetrix Electronics and suitable for industrial automation, embedded microcontroller systems, portable medical sensors, and wireless communication modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3828-50DBVRG4 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

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and real-time control solutions.

The TPS382x product line delivers compact, low-power voltage supervisors for processor-based systems, designed to ensure reliable power-on sequencing, undervoltage protection, and software fault recovery in industrial, automotive, and portable applications.

FAQ

What is the exact reset threshold voltage for TPS3828-50DBVRG4?

The TPS3828-50DBVRG4 has a negative-going input threshold voltage (VIT−) of 4.49V (minimum), 4.55V (nominal), and 4.64V (maximum) over −40°C to 85°C. This 5V-specific threshold ensures accurate supervision of standard 5V rails without external calibration. The device also provides 50mV hysteresis to prevent chatter during slow-rising or noisy supply conditions. All values are measured per TI SLVS165O specification.

Does TPS3828-50DBVRG4 require external components for basic operation?

No, TPS3828-50DBVRG4 requires no external components for core supervision functionality. Its fixed internal voltage divider sets the 4.55V threshold, and the internal 90kΩ pull-up on MR eliminates need for external biasing. A bypass capacitor (0.1μF ceramic) near VDD is recommended for noise immunity, but not mandatory for functional operation. The open-drain RESET output does require an external pull-up resistor for proper logic-level definition.

How does the watchdog timer in TPS3828-50DBVRG4 function?

The watchdog timer in TPS3828-50DBVRG4 triggers a reset if no falling edge occurs on WDI within 0.9s to 2.5s. Each valid falling edge resets the timeout counter. If WDI floats, the device generates internal pulses to prevent false timeout. When timeout occurs, RESET asserts low for 120ms to 300ms. The timer is disabled only by disconnecting WDI or holding it static - not by asserting MR or power cycling.

Can TPS3828-50DBVRG4 be used in systems requiring a wider temperature range?

TPS3828-50DBVRG4 is characterized for −40°C to 85°C operation. For extended temperature requirements (−40°C to 125°C), TI offers the TPS3823A-33 variant, but no A-grade version exists for the 5V threshold. Engineers needing 125°C operation with 5V supervision must evaluate alternatives such as the TLV809E50DBZR or contact TI for custom qualification paths. TPS3828-50DBVRG4 itself is not rated beyond 85°C.

What is the purpose of the MR pin on TPS3828-50DBVRG4?

The MR (manual reset) pin on TPS3828-50DBVRG4 allows external forcing of a reset independent of VDD level or watchdog state. Pulling MR low asserts RESET immediately and holds it low for the full 200ms delay period after MR returns high. An internal 90kΩ pull-up resistor biases MR high when unconnected, making it safe to leave floating in designs without manual reset functionality. This feature enables system-level reset coordination via FPGA, button, or host processor.