Overview
The TPS730285DBVR is a low-dropout (LDO) linear voltage regulator from Texas Instruments, designed for use in noise-sensitive, battery-operated equipment. This regulator is part of the TPS730 family, which is optimized for low dropout voltages, high power-supply rejection ratio (PSRR), and ultra-low output noise. The device features an enable input to reduce supply currents to less than 1 μA when the regulator is turned off, making it highly efficient in power-saving applications.
Key Specifications
| Parameter | Test Conditions | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|
| Input Voltage Range | – | 2.7 | – | 5.5 | V |
| Continuous Output Current | – | 0 | – | 200 | mA |
| Output Voltage Accuracy | 0 µA ≤ IOUT ≤ 200 mA, 2.75 V ≤ VIN ≤ 5.5 V | –2% | – | 2% | VOUT(nom) |
| Line Regulation | VOUT + 1 V ≤ VIN ≤ 5.5 V | – | 0.05 | – | %/V |
| Load Regulation | 0 µA ≤ IOUT ≤ 200 mA, TJ = 25°C | – | 5 | – | mV |
| Dropout Voltage | IOUT = 200 mA, VIN = VOUT(nom) – 0.1 V | 120 | – | 210 | mV |
| Power-Supply Rejection Ratio (PSRR) | f = 100 Hz, IOUT = 200 mA, TJ = 25°C | – | 68 | – | dB |
| Output Noise | BW = 200 Hz to 100 kHz, IOUT = 200 mA, CNR = 0.01 μF | – | 33 | – | μVRMS |
| Enable Input Voltage (High) | 2.7 V ≤ VIN ≤ 5.5 V | 1.7 | – | VIN | V |
| Enable Input Voltage (Low) | 2.7 V ≤ VIN ≤ 5.5 V | 0 | – | 0.7 | V |
| Shutdown Current | VEN = 0 V, 2.7 V ≤ VIN ≤ 5.5 V | 0.07 | – | 1 | μA |
Key Features
- Low Dropout Voltage: The TPS730285DBVR features a low dropout voltage of 120 mV to 210 mV at 200 mA output current, ensuring efficient voltage regulation.
- High PSRR: High power-supply rejection ratio (PSRR) of 68 dB at 100 Hz, which is crucial for noise-sensitive applications.
- Ultra-Low Output Noise: The regulator offers ultra-low output noise of 33 μVRMS, making it suitable for applications requiring minimal noise.
- Low Quiescent Current: A typical quiescent current of 170 μA, which is beneficial for battery-operated devices to extend battery life.
- Enable Input: An active-high enable input allows the device to be turned off, reducing supply currents to less than 1 μA.
- Undervoltage Lockout (UVLO): The device includes a UVLO circuit to prevent unpredictable behavior when the input voltage is below the operational range.
- Internal Current Limit and Thermal Protection: Features internal current limiting and thermal protection to prevent gross device failure.
Applications
The TPS730285DBVR is optimized for use in noise-sensitive, battery-operated equipment. Some typical applications include:
- Battery-powered devices such as handheld electronics and portable medical equipment.
- Wireless communication devices requiring low noise and high PSRR.
- Audio and video equipment where low noise is critical.
- Industrial control systems and sensors that need stable and noise-free power supply.
Q & A
- What is the input voltage range for the TPS730285DBVR?
The input voltage range is from 2.7 V to 5.5 V.
- What is the maximum output current of the TPS730285DBVR?
The maximum output current is 200 mA.
- What is the typical output noise of the TPS730285DBVR?
The typical output noise is 33 μVRMS.
- How does the enable input work on the TPS730285DBVR?
The enable input is active high. The device is enabled when the EN pin exceeds 1.7 V and disabled when it drops below 0.7 V.
- What is the quiescent current of the TPS730285DBVR?
The typical quiescent current is 170 μA.
- Does the TPS730285DBVR have built-in thermal protection?
Yes, the device features internal current limiting and thermal protection.
- What is the dropout voltage of the TPS730285DBVR?
The dropout voltage is between 120 mV and 210 mV at 200 mA output current.
- How does the undervoltage lockout (UVLO) work on the TPS730285DBVR?
The UVLO circuit disables the output until the input voltage is greater than the rising UVLO voltage, preventing unpredictable behavior.
- What is the power-supply rejection ratio (PSRR) of the TPS730285DBVR?
The PSRR is 68 dB at 100 Hz.
- What are the recommended layout guidelines for the TPS730285DBVR?
Capacitors should be placed close to the device on the same side of the PCB, and vias and long traces should be avoided to minimize ESL and ESR.
