Overview
The TPS79901DRVT is a low-dropout (LDO) linear voltage regulator produced by Texas Instruments. This device is designed to provide high performance with ultra-low current consumption, making it suitable for various applications including RF and precision analog circuits. The TPS79901DRVT features a high-gain, high-bandwidth error loop that ensures good power supply rejection ratio (PSRR) even at very low headroom (VIN – VOUT). It also includes a noise-reduction pin to improve PSRR and reduce noise generated by the band-gap reference. The regulator is fully specified over a temperature range of –40°C to +125°C and is available in several package options, including the DSBGA, SOT-23-THIN, and WSON packages.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| Input Voltage (VIN) | 2.7 | - | 6.5 | V |
| Output Current (IOUT) | 0.5 | - | 200 | mA |
| Operating Junction Temperature (TJ) | -40 | - | 125 | °C |
| Output Voltage Accuracy | -2% | ±1% | 2% | % |
| Line Regulation (ΔVO/ΔVI) | - | 0.02 | - | %/V |
| Load Regulation (ΔVO/ΔIO) | - | 0.002 | - | %/mA |
| Dropout Voltage (VDO) | 90 | - | 175 | mV |
| Ground Pin Current (IGND) | 40 | - | 60 | μA |
| Shutdown Current (ISHDN) | 0.15 | - | 1 | μA |
| Thermal Shutdown Temperature | - | - | 165 | °C |
Key Features
- 200-mA low-dropout regulator with enable (EN) pin.
- Multiple fixed output voltage versions available from 1.2 V to 4.5 V.
- Ultra-low noise and fast start-up times.
- High PSRR due to a high-gain, high-bandwidth error loop.
- Noise-reduction pin to bypass noise generated by the band-gap reference.
- Inrush current protection and overshoot detection.
- Thermal and overcurrent protection.
- Stable with ceramic capacitors.
- Available in low-profile packages such as DSBGA, SOT-23-THIN, and WSON.
Applications
The TPS79901DRVT is an excellent choice for various applications requiring high performance and low power consumption. These include:
- Wireless handsets and WLAN cards.
- Portable electronics due to its low ground current and high efficiency.
- RF and precision analog circuits where low noise and high PSRR are critical.
- Any system requiring a stable, low-dropout voltage regulator with advanced protection features.
Q & A
- What is the maximum output current of the TPS79901DRVT?
The maximum output current is 200 mA.
- What is the operating junction temperature range of the TPS79901DRVT?
The operating junction temperature range is –40°C to +125°C.
- What types of packages are available for the TPS79901DRVT?
The device is available in DSBGA, SOT-23-THIN, and WSON packages.
- How does the TPS79901DRVT protect against inrush current?
The device features inrush current protection when the EN toggle is used to start the device, immediately clamping the current.
- What is the typical dropout voltage of the TPS79901DRVT?
The typical dropout voltage is 100 mV at a 200-mA output for VOUT(nom) ≤ 3.3 V.
- How does the TPS79901DRVT handle thermal issues?
The device includes thermal shutdown protection, with a shutdown temperature of 165°C and a reset temperature of 145°C.
- What is the purpose of the noise-reduction pin (NR) in the TPS79901DRVT?
The NR pin is used to bypass noise generated by the band-gap reference and improve PSRR.
- How does the TPS79901DRVT manage overshoot at the output?
If the output voltage overshoots 5% from the nominal value, a pulldown resistor reduces the voltage to normal operating conditions.
- What is the shutdown current of the TPS79901DRVT when the EN pin is driven below 0.4 V?
The shutdown current is typically 0.15 μA.
- What type of capacitors are recommended for use with the TPS79901DRVT?
Ceramic capacitors are recommended for stability, and a low leakage CNR capacitor is suggested for the noise-reduction pin.
