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TI TPS3840DL17DBVR High Input Voltage Monitor with MR and Programmable Delay

Shenzhen Mingjiada Electronics Co., Ltd., as a leading authorised independent distributor of electronic components worldwide, has been supplying TI's original TPS3840DL17DBVR high input voltage monitor chips for an extended period. This ultra-low power voltage monitor, renowned for its exceptional performance and reliability, is widely adopted in industries such as industrial control, automotive electronics, and IoT devices.

Product Overview:  

The TPS3840DL17DBVR is a ultra-low power high input voltage monitor housed in a compact SOT-23-5 package, specifically designed for applications requiring precise voltage monitoring and system reset functionality. The TPS3840DL17DBVR device is renowned in the power management field for its exceptional performance and reliability, making it particularly suitable for power monitoring needs in battery-powered devices and various portable electronic products.

The core features of the TPS3840DL17DBVR monitor set it apart from its peers. First, it supports a wide input voltage range of 1.7V to 10V, making it compatible with various power scenarios, from low-power microcontroller power rails to higher-voltage industrial power systems. Its threshold voltage is fixed at 1.7V, and when the monitored voltage drops to this level, it triggers a reset signal, ensuring the system safely shuts down or enters a protected state when the voltage is insufficient.

In terms of power consumption performance, the TPS3840DL17DBVR sets an industry benchmark. Its typical static current is only 350nA, and this ultra-low power consumption feature can significantly extend the operating time of battery-powered devices, making it ideal for power-sensitive applications such as IoT terminals and wearable devices. Even in harsh environments, the device maintains stable low power consumption characteristics, with an operating temperature range covering the industrial-grade standard of -40°C to 125°C, ensuring reliable operation under various environmental conditions.

The TPS3840DL17DBVR offers a flexible reset control mechanism. The reset signal is active low and is output via the RESET pin, which can be directly connected to the reset input of most microprocessors. The device incorporates a fixed 619ms reset delay, carefully designed to ensure that the reset signal is released only after the power supply has stabilised, preventing the system from starting incorrectly before the voltage has fully established, thereby significantly enhancing system reliability.

The TPS3840DL17DBVR also features a configurable pull-up resistor option, providing design flexibility for users. A 10kΩ pull-up resistor is typically used in standard applications to balance power consumption and interference resistance. For applications with stringent power consumption requirements, users can increase the pull-up resistor to 100kΩ to further reduce static current, meeting the most demanding energy-saving requirements.

From a packaging and layout perspective, the TPS3840DL17DBVR adopts an ultra-compact SOT-23-5 package, occupying minimal board space, making it ideal for space-constrained PCB designs. This package not only saves valuable circuit board space but also offers excellent thermal performance, ensuring the device maintains stable performance under various operating conditions.

The internal architecture of the TPS3840DL17DBVR has been optimised, integrating a high-precision voltage reference and comparator to ensure accurate voltage monitoring and fast response times. Its design also considers interference resistance, effectively suppressing power supply noise and transient interference to prevent false triggering of the reset signal. These features collectively form a robust and reliable power monitoring solution, providing safety assurance for various electronic systems.

Specifications

Threshold voltage: 1.7 V

Number of Monitoring Inputs: 1 input  

Output Type: Low-level active, open-drain output  

Battery Backup Switch: No backup  

Reset Delay Time: 619 milliseconds  

Supply Voltage - Maximum: 10 V  

Minimum Operating Temperature: -40°C  

Maximum Operating Temperature: +125°C  

Accuracy: 1%  

Operating Supply Current: 300 nA  

Supply Voltage - Minimum: 1.5 V

Features

Wide Operating Voltage Range: 1.5 V to 10 V

Nanoampere Supply Current: 300 nA (typical), 700 nA (maximum)  

Fixed Threshold Voltage (VIT-)  

Threshold Voltage Range: 1.6 V to 4.9 V, in 0.1 V steps  

High precision: 1% (typical), 1.5% (maximum)  

Built-in hysteresis (VIT+)

1.6 V < VIT- ≤ 3.0 V = 100 mV (typical)

3.1 V ≤ VIT- < 4.9 V = 200 mV (typical)

Start-up delay (tSTRT): 220 µs (typical), 350 µs (maximum)

Programmable reset time delay (tD): 50 µs (no capacitor) to 6.2 s (10 µF)

Active low-level manual reset (MR)

Wide temperature range: –40°C to +125°C

Core technical advantages

The TPS3840DL17DBVR high-input voltage monitor demonstrates exceptional value in a wide range of applications thanks to its unique technical advantages. As a precision power management device, it not only provides basic voltage monitoring functionality but also addresses critical challenges in electronic system design through a series of innovative designs.

Ultra-low power consumption is one of the most significant advantages of the TPS3840DL17DBVR. Compared to traditional voltage monitors, its typical static current of 350nA reduces power consumption by more than two orders of magnitude. This feature directly translates into longer battery life, which is particularly important for devices powered by button batteries or small lithium-ion batteries. In practical applications, systems using the TPS3840DL17DBVR may extend standby time from months to years, significantly reducing maintenance frequency and costs.

The TPS3840DL17DBVR device's wide voltage range compatibility is also noteworthy. Its input voltage range of 1.7V to 10V enables it to support diverse power supply architectures. Whether in 3.3V or 5V logic systems, higher-voltage industrial equipment, or battery-powered scenarios where voltage gradually decreases during discharge, the TPS3840DL17DBVR provides reliable monitoring functionality. This broad adaptability reduces the need for designers to switch monitoring devices between different voltage systems, simplifying material management.

The precise threshold voltage design ensures system safety. The fixed 1.7V threshold is optimised for modern low-power microcontrollers and digital circuits, triggering a reset before the voltage drops to levels that could cause system instability or data corruption. This preventive protection mechanism is particularly important for applications with high data integrity requirements, such as medical devices, financial terminals, and industrial control systems.

The built-in 619ms fixed reset delay is another carefully designed feature. This delay time is sufficient for most power systems to fully stabilise, preventing system startup anomalies caused by premature release of the reset. At the same time, this delay time is not so long as to affect user experience or system response speed, achieving a perfect balance between safety and usability.  

Typical Applications

In IoT terminal devices, the TPS3840DL17DBVR plays a critical role. These devices are typically deployed in locations that are difficult to maintain frequently and rely on battery power for long-term operation. By monitoring the main power supply voltage using the TPS3840DL17DBVR, the device can safely shut down or enter deep sleep mode when the voltage is insufficient, preventing abnormal behaviour or data loss caused by low voltage. Its ultra-low power consumption ensures that the monitoring function itself does not become a significant burden on the battery.

Industrial automation control systems also benefit from the TPS3840DL17DBVR's reliable monitoring capabilities. In PLCs (programmable logic controllers), HMIs (human-machine interfaces), and industrial sensor networks, a stable power supply is the foundation for system reliability. This monitor ensures that the control system shuts down in an orderly manner during voltage fluctuations or power outages and correctly initialises upon power restoration, significantly increasing the mean time between failures (MTBF) of industrial equipment.

For automotive electronics applications, while the TPS3840DL17DBVR itself is not a vehicle-grade device, its wide temperature range (-40°C to 125°C) enables it to meet the requirements of many in-vehicle systems. In in-vehicle infotainment systems, body control modules, and advanced driver-assistance systems, it can monitor the stability of secondary power rails, ensuring these systems operate reliably under various vehicle operating conditions.

In the consumer electronics sector, such as smart home devices, wearable devices, and portable medical monitors, the TPS3840DL17DBVR's compact size and low power consumption are particularly valuable. These products typically have strict requirements for PCB space and battery life, and this monitor provides professional power management functionality without significantly increasing system load.

Design Flexibility

The TPS3840DL17DBVR offers configurable pull-up resistor options, demonstrating excellent design flexibility. In typical applications, a 10kΩ pull-up resistor provides good noise immunity; for applications with extreme power sensitivity, designers can opt for external resistors with values as high as 100kΩ or higher to further reduce static current. This flexibility allows engineers to optimise designs based on specific application requirements rather than being forced to accept fixed compromises.

The device's manual reset (MR) feature adds another layer of control to system design. Through the MR pin, an external signal can actively trigger a reset sequence, which is particularly useful during system debugging, firmware updates, or mode switching. Designers can leverage this feature to implement more complex power management strategies to meet the unique requirements of specific application scenarios.

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