Texas Instruments TPS3828-50DBVR

Overview

TPS3828-50DBVR from Texas Instruments is a 5V supply voltage supervisor IC with open-drain active-low reset output, integrated watchdog timer (1.6 s timeout), manual reset input, and 200 ms reset delay. It operates from −40°C to 85°C in a 5-pin SOT-23 package and delivers 15 µA typical supply current. It is used for reliable power-on reset and fault recovery in microcontroller-based embedded systems.

For engineers reviewing the TPS3828-50DBVR datasheet, TPS3828-50DBVR pinout, TPS3828-50DBVR application, or TPS3828-50DBVR equivalent, key selection criteria include its fixed 4.55 V threshold (±30 mV hysteresis), open-drain RESET compatibility with mixed-voltage logic, WDI watchdog supervision, MR assertion timing, and SOT-23 footprint constraints.

Technical Context

The TPS3828-50DBVR implements a precision bandgap-based voltage reference and comparator to monitor VDD against a factory-trimmed negative-going threshold of 4.55 V (min 4.49 V, max 4.64 V). Its internal 200 ms delay timer initiates after VDD exceeds VIT− + VHYS and holds RESET low until expiration.

Watchdog functionality relies on edge-triggered WDI input: a falling edge resets the 1.6 s timeout counter; absence of edges beyond timeout asserts RESET. The open-drain RESET output requires an external pull-up and supports wired-OR configurations, unlike push-pull variants in the same family.

Key Specifications

Pinout & Package

TPS3828-50DBVR uses a 5-pin SOT-23 (DBV) package with 2.90 mm × 1.60 mm body size and standard lead pitch. Pin 1 is RESET (open-drain active-low output), Pin 2 is GND, Pin 3 is MR (manual reset input), Pin 4 is WDI (watchdog timer input), and Pin 5 is VDD (supply input).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823-50DBVR and TPS3820-50DBVR, the TPS3828-50DBVR uniquely combines open-drain output flexibility with integrated watchdog supervision-enabling robust reset bus architectures and unattended recovery in distributed embedded systems without adding discrete logic or timers.

Availability

TPS3828-50DBVR is available at Aetrix Electronics and suitable for industrial PLC controllers, wireless sensor nodes, notebook system management units, and programmable logic controller I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for TPS3828-50DBVR 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 delivering analog and embedded processing solutions, with leadership in power management, signal chain, and high-reliability ICs for industrial, automotive, and communications markets.

The TPS382x product line was designed specifically for reliable power-on reset and runtime supervision of DSPs, microcontrollers, and microprocessors-emphasizing low power, small footprint, and configurable watchdog and reset behavior in harsh operating environments.

FAQ

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

The TPS3828-50DBVR has a nominal negative-going input threshold voltage (VIT−) of 4.55 V, with a guaranteed range of 4.49 V to 4.64 V across −40°C to +85°C. This fixed threshold is factory-trimmed and requires no external components, making it suitable for precise 5 V rail supervision.

Does TPS3828-50DBVR require an external pull-up resistor on the RESET pin?

Yes, TPS3828-50DBVR features an open-drain RESET output and requires an external pull-up resistor to the appropriate logic rail (e.g., 3.3 V or 5 V). The value is typically 10 kΩ to 100 kΩ depending on bus capacitance and rise-time requirements; no pull-up is integrated internally.

How does the watchdog timer in TPS3828-50DBVR operate?

The TPS3828-50DBVR watchdog timer has a nominal timeout of 1.6 s. It is cleared by each falling edge on the WDI pin. If no edge occurs within the timeout window, RESET is asserted for 200 ms. Floating WDI generates internal pulses to prevent spurious timeout; a 1 kΩ pull-down disables this behavior.

Can TPS3828-50DBVR be used with a 3.3 V microcontroller I/O pin for MR or WDI?

Yes. MR and WDI inputs accept logic levels referenced to VDD (1.1–5.5 V). With VDD = 5 V, VIH = 0.7 × VDD = 3.5 V min and VIL = 0.3 × VDD = 1.5 V max, so a 3.3 V MCU GPIO meets these thresholds. Ensure slew rate compliance (≥100 ns/V) for reliable edge detection on WDI.

What is the supply current consumption of TPS3828-50DBVR under typical operation?

TPS3828-50DBVR draws 15 µA typical supply current (IDD) when MR, WDI, and outputs are unconnected, and up to 25 µA maximum across temperature and process variation. This ultra-low quiescent current supports battery-powered and energy-harvesting applications where standby power is critical.