Overview
The TPS76801QDRG4 is a fast-transient-response, low-dropout voltage regulator from Texas Instruments. This device is part of the TPS768xxQ family, which is designed to provide high performance at a reasonable cost. The TPS76801QDRG4 is an adjustable version of the regulator, allowing output voltages to be set between 1.2 V and 5.5 V using an external resistor divider. It features a low dropout voltage, ultralow quiescent current, and stability with minimal external components.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Input Voltage Range | 2.7 V to 10 V | |
| Output Voltage Range | Adjustable from 1.2 V to 5.5 V | |
| Output Current | Up to 1 A | |
| Dropout Voltage | Typically 230 mV at 1 A | TPS76850, IO = 1 A, TJ = +25°C |
| Quiescent Current | Typically 85 µA | IO = 1 A, TJ = +25°C |
| Load Regulation | 3 mV | BW = 200 Hz to 100 kHz, CO = 10 µF |
| Output Noise Voltage | 55 µVrms | IC = 1 A, TJ = +25°C |
| Thermal Shutdown Junction Temperature | 150°C | |
| Power Supply Ripple Rejection | 60 dB | f = 1 kHz, CO = 10 µF, TJ = +25°C |
| Minimum Input Voltage for Valid PG | 1.1 V | IO(PG) = 300 µA |
| Power Good Hysteresis Voltage | 0.5% of VO |
Key Features
- Fast Transient Response: Stable with 10 µF capacitors, ensuring quick response to load changes.
- Low Dropout Voltage: Typically 230 mV at 1 A, reducing power loss and improving efficiency.
- Ultralow Quiescent Current: Typically 85 µA, which remains constant over the full load range, making it suitable for battery-powered systems.
- Adjustable Output Voltage: Can be set between 1.2 V and 5.5 V using an external resistor divider.
- Power Good Indicator: An open-drain output that monitors the status of the regulator, turning on when the output voltage drops to between 92% and 98% of its nominal value.
- Shutdown Mode: Places the output in a high-impedance state and reduces quiescent current to 2 µA.
- No Minimum Load Requirement: Stable operation at zero load.
- High Power Supply Ripple Rejection: 60 dB at 1 kHz with a 10 µF capacitor.
Applications
The TPS76801QDRG4 is suitable for a variety of applications requiring low dropout voltage and high efficiency. These include:
- Battery-Powered Devices: The low quiescent current and low dropout voltage make it ideal for extending battery life.
- Portable Electronics: Such as handheld devices, smartphones, and tablets where power efficiency is crucial.
- Industrial Control Systems: Where stable and efficient voltage regulation is necessary.
- Automotive Systems: For applications requiring robust and efficient voltage regulation in harsh environments.
- Medical Devices: Where precise and reliable voltage regulation is essential.
Q & A
- What is the input voltage range of the TPS76801QDRG4?
The input voltage range is from 2.7 V to 10 V. - What is the typical dropout voltage of the TPS76801QDRG4?
The typical dropout voltage is 230 mV at 1 A. - How is the output voltage of the TPS76801QDRG4 adjusted?
The output voltage is adjusted using an external resistor divider. - What is the quiescent current of the TPS76801QDRG4?
The quiescent current is typically 85 µA. - Does the TPS76801QDRG4 require a minimum load for operation?
No, it is stable at zero load. - What is the purpose of the Power Good (PG) output?
The PG output monitors the status of the regulator, indicating when the output voltage drops to between 92% and 98% of its nominal value. - How does the shutdown mode affect the TPS76801QDRG4?
The shutdown mode places the output in a high-impedance state and reduces the quiescent current to 2 µA. - What type of capacitors are recommended for the output of the TPS76801QDRG4?
Solid tantalum electrolytic, aluminum electrolytic, and multilayer ceramic capacitors with an ESR between 60 mΩ and 1.5 Ω are recommended. - What is the thermal shutdown junction temperature of the TPS76801QDRG4?
The thermal shutdown junction temperature is 150°C. - How does the TPS76801QDRG4 handle power supply ripple rejection?
The device has a power supply ripple rejection of 60 dB at 1 kHz with a 10 µF capacitor.
