Texas Instruments TPS3828-50DBVTG4

Overview

TPS3828-50DBVTG4 from Texas Instruments is a 5V-supply voltage supervisor IC with open-drain active-low reset output, integrated watchdog timer (1.6s timeout), 200ms reset delay, and manual reset input - used for reliable power-on initialization and fault recovery in microcontroller-based systems.

For engineers reviewing the TPS3828-50DBVTG4 datasheet, TPS3828-50DBVTG4 pinout, TPS3828-50DBVTG4 application, or TPS3828-50DBVTG4 equivalent, key selection criteria include its fixed 4.55V threshold (±30mV hysteresis), 15μA supply current, −40°C to 85°C operation, SOT-23-5 package, and open-drain RESET compatibility with wired-OR logic and level-shifting interfaces.

Technical Context

The TPS3828-50DBVTG4 implements a precision bandgap-based voltage reference and comparator to monitor VDD against a factory-trimmed 4.55V negative-going threshold (VIT−). Its internal 200ms power-on reset timer initiates after VDD exceeds VIT− + VHYS, ensuring stable system boot before releasing RESET.

It integrates a 1.6s watchdog timer triggered by falling edges on WDI; if no edge occurs within timeout, RESET asserts for 200ms. The open-drain RESET output requires an external pull-up and supports bidirectional reset signaling in multi-master systems.

Key Specifications

Pinout & Package

TPS3828-50DBVTG4 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for space-constrained PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823-50DBVT and MAX6326XR31D3+T, the TPS3828-50DBVTG4 uniquely combines open-drain RESET, 5V-specific threshold, and integrated watchdog - making it optimal for fault-resilient 5V microcontroller systems requiring bus-shared reset signaling.

Availability

TPS3828-50DBVTG4 is available at Aetrix Electronics and suitable for industrial PLC controllers, wireless sensor nodes, notebook embedded controllers, and programmable logic controller I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3828-50DBVTG4 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 leader delivering analog and embedded processing solutions, with decades of expertise in power management and system supervision ICs.

The TPS382x family was designed specifically for robust power-on reset and runtime fault detection in DSP, microcontroller, and microprocessor systems - emphasizing low quiescent current, fixed-threshold accuracy, and integrated watchdog safety.

FAQ

What is the exact reset threshold voltage for TPS3828-50DBVTG4?

The TPS3828-50DBVTG4 has a nominal negative-going input threshold voltage (VIT−) of 4.55V, with guaranteed min/max values of 4.49V and 4.64V across −40°C to 85°C. This 5V-specific threshold ensures accurate detection of 5V rail brownout conditions without external scaling components.

Does TPS3828-50DBVTG4 require external components for basic operation?

No - the TPS3828-50DBVTG4 operates autonomously with only a 0.1μF ceramic bypass capacitor on VDD. Its fixed 4.55V threshold, 200ms reset delay, and 1.6s watchdog timer are all monolithically integrated; no resistors, capacitors, or trim pots are needed for standard supervision functionality.

How does the watchdog timer on TPS3828-50DBVTG4 function?

The TPS3828-50DBVTG4 watchdog timer resets on each falling edge at WDI. If no edge occurs within 1.6s (typical), RESET asserts for 200ms. The timer clears automatically upon RESET assertion or WDI falling edge. Floating WDI generates internal pulses to prevent timeout - a 1kΩ pulldown disables this behavior if needed.

Can TPS3828-50DBVTG4 drive multiple devices on a shared reset bus?

Yes - the open-drain RESET output of TPS3828-50DBVTG4 is explicitly designed for wired-OR configurations. When used with a common pull-up resistor, it safely shares a reset bus with other open-drain supervisors or processors, enabling coordinated system-level reset without contention.

What is the purpose of the MR pin on TPS3828-50DBVTG4?

MR is an active-low manual reset input that forces RESET assertion regardless of VDD level or watchdog state. Internally pulled up to VDD via 90kΩ, it accepts pushbutton or logic signals - allowing external intervention for debug, recovery, or thermal shutdown events without modifying power sequencing.