Texas Instruments TPS77930DGK

TPS77930DGK LDO Regulator from Texas Instruments Product Summary

The TPS77930DGK from Texas Instruments is a precision low-dropout (LDO) linear voltage regulator designed to deliver a constant 3V output at currents up to 250mA. Housed in an 8-VSSOP (0.118", 3.00mm width), the device is crafted for compact, high-performance electronics requiring reliable voltage regulation and robust system supervision. As a member of the TPS779xx family, the TPS77930DGK distinguishes itself through integrated power-on reset features, ultralow quiescent current, and broad ambient operating temperature from -40°C to +125°C. These attributes make it ideal for battery-operated devices, embedded applications, and any system where board space, efficiency, and reliability are top priorities.

Main Electrical Parameters and Key Attributes of the TPS77930DGK

At its core, the TPS77930DGK regulates a fixed 3V output (±2% tolerance) and supports input voltages up to 10V. The regulator is engineered for ultralow dropout, typically 200mV at full load (250mA), with a maximum of 0.48V. Its design leverages a PMOS pass element, resulting in a quiescent current of only 92μA under load and less than 1μA in shutdown, ensuring minimal drain on battery-powered systems. Noise performance is exceptional—output noise is just 55μVrms—without the need for additional bypass capacitors. Power supply rejection ratio (PSRR) is 55dB at 1kHz, contributing to stability in noisy environments. The regulator also supports fast transient response, suitable for circuits with sudden load changes, and is optimized for stability with a variety of output capacitors (ceramic, tantalum, and aluminum electrolytic).

Built-In Reset Capability of the TPS77930DGK and Its Impact on System Dependability

A defining feature of TPS77930DGK is its integrated power-on reset circuit, functioning as a supply voltage supervisor. This reset output initiates a system reset whenever the regulated output voltage falls below 95% of its nominal value, providing a vital safeguard for microcontrollers, DSPs, or processors during power-up or undervoltage conditions. Upon reaching 95% of target output, the RESET pin transitions to a high-impedance state after a 220ms delay, ensuring stable startup. Conversely, in overload or brown-out, it returns to active-low, signaling fault to downstream logic. The RESET output is open-drain and requires a pull-up resistor for integration with system logic.

Design Recommendations for TPS77930DGK in Circuit Applications

Successful implementation of the TPS77930DGK in modern electronic circuits involves careful pin management and layout practices. The EN (enable) pin facilitates regulator activation or shutdown; connecting EN low places the part into sleep mode, minimizing quiescent current to below 1μA. For fixed-output options, the SENSE pin must be connected as close as possible to the output node to minimize susceptibility to noise, as poor routing can compromise regulation. The RESET pin, central to reliable system startup, must be paired with an appropriate pull-up resistor to guarantee logic compatibility. For PCB layouts, short, direct traces to the output, SENSE, and feedback pins (in adjustable versions) are recommended to maintain regulation accuracy and minimize noise pickup.

Choosing External Capacitors for TPS77930DGK to Ensure Stability and Optimal Performance

Like all LDO regulators, the TPS77930DGK requires an output capacitor between OUT and GND to ensure loop stability. The recommended minimum is 1μF, provided the equivalent series resistance (ESR) meets the specified requirements. For low-ESR ceramic capacitors, a value of at least 10μF is suggested. Capacitor dielectric type impacts performance—NPO, X7R, and X5R ceramics are preferred for stability across temperature; Y5U and Z5U types, while compact, display large capacitance shifts over temperature and are not recommended. Placement of the output capacitor should be direct and close to the device to minimize parasitic resistance and inductance, which can degrade dynamic response. No input capacitor is generally required, but one may be beneficial for improved transient response if the regulator is far from the main supply.

Protection Features and Operational Reliability of the TPS77930DGK

Ensuring system protection, the TPS77930DGK integrates multiple mechanisms: overcurrent protection, thermal shutdown, and reverse polarity tolerance. If output current exceeds the internal threshold (approx. 0.9A), the device linearly limits output voltage, safeguarding against device damage and preventing excessive package heating. Should junction temperature rise above 150°C (typical), thermal protection disables output until temperature falls below 130°C, at which point operation resumes automatically. The PMOS pass transistor incorporates a back diode; if input falls below output (such as during power-down), current is conducted from output to input, so external current limiting is advised in designs where extended reverse voltages may occur.

Power Loss and Thermal Solutions for TPS77930DGK Devices

Reliable operation of the TPS77930DGK requires careful consideration of power dissipation and thermal management. Maximum junction temperature should not exceed 125°C under standard application conditions. Total device dissipation is calculated as (VI – VO) × IO. Design engineers should ensure that heat generated does not surpass the capability of the package (thermal resistance RθJA = 266.2°C/W for 8-MSOP without airflow). Strategies for ensuring safe thermal operation include limiting output current, minimizing input voltage above the regulated output, providing adequate PCB copper area for heat sinking, and considering airflow if operating at the upper range of specs.

TPS77930DGK Package Details, Standards, and Environmental Ratings

TPS77930DGK is available in lead-free, ROHS3-compliant 8-VSSOP packaging, with a Moisture Sensitivity Level (MSL) of 1 (Unlimited). It meets requirements for restricted substance content and environmental robustness, ensuring broad applicability in global markets. The device holds REACH-unaffected status and is classified for export under ECCN EAR99. Marking, tape, and reel information comply with Texas Instruments’ standards for process control and traceability.

Alternative/Ersatz Models Compatible with TPS77930DGK

When considering replacements or functional equivalents for the TPS77930DGK, other models in the TPS779xx series warrant attention—specifically, TPS77901 (adjustable, with external resistor divider), TPS77918 (fixed 1.8V), and TPS77925 (fixed 2.5V). These share the same package, output current rating, quiescent performance, and integrated reset functionality, allowing broader voltage selection or output adjustability for alternate designs. Additionally, for applications requiring similar form-factor but active-low enable, the TPS773xx and TPS774xx families may be considered. Always verify voltage, current, enable/reset configuration, and pinout before substitution or migration.

Conclusion

: TPS77930DGK in modern electronic systems

The TPS77930DGK linear regulator offers product selection engineers and procurement professionals a robust blend of low-dropout, precise 3V output, high efficiency, and integrated supervisory functions in a compact MSOP package. Its ultralow quiescent current, superior noise performance, and smart protection features make it a go-to solution in battery-powered, portable, and embedded systems. Proper implementation, including careful capacitor selection and PCB layout, will fully leverage its capabilities, while understanding its operational boundaries ensures long-term reliability. When evaluating LDOs for mission-critical or space-constrained applications, TPS77930DGK and its family variants stand out for their balance of technical depth and practical system protection.