Overview
The LP38798SD-ADJ/NOPB is a high-performance, low-noise Linear Low-Dropout (LDO) voltage regulator produced by Texas Instruments. This component is designed to meet the stringent requirements of sensitive RF/Analog circuitry, utilizing a novel linear topology on an advanced CMOS process. It delivers ultra-low output noise and high Power Supply Rejection Ratio (PSRR) at switching power supply frequencies, making it ideal for various post-regulation applications.
Key Specifications
| Parameter | Value |
|---|---|
| Input Voltage Range | 3 V to 20 V |
| Output Current | Up to 800 mA |
| Output Noise | 5 µV RMS (10 Hz to 100 kHz) |
| PSRR | 90 dB at 10 kHz, 60 dB at 100 kHz |
| Output Voltage Initial Accuracy | ±1% at TJ = 25°C |
| Dropout Voltage | 200 mV (Typical) at 800 mA |
| Output Capacitor Stability | Stable with ceramic or tantalum output capacitors, minimum 1 µF |
| Package Type | WSON (DNT) with 12 pins |
| Operating Temperature Range | -40°C to 125°C |
Key Features
- Wide operating input voltage range: 3 V to 20 V
- Ultra-low output noise: 5 µV RMS (10 Hz to 100 kHz)
- High PSRR: 90 dB at 10 kHz, 60 dB at 100 kHz
- Very low dropout voltage: 200 mV (Typical) at 800 mA
- Stable with both ceramic and tantalum output capacitors
- Excellent line and load transient response
- Current limit and overtemperature protection
- Enable feature for power management
- Compatibility with WEBENCH Power Designer for custom designs
Applications
The LP38798SD-ADJ/NOPB is well-suited for a variety of applications, particularly those requiring low noise and high PSRR. These include:
- Sensitive RF/Analog circuitry
- Post-regulation in power supplies
- High-performance audio and video systems
- Medical and industrial equipment
- Wireless communication devices
Q & A
- What is the maximum output current of the LP38798SD-ADJ/NOPB?
The maximum output current is up to 800 mA. - What is the input voltage range of the LP38798SD-ADJ/NOPB?
The input voltage range is from 3 V to 20 V. - What is the output noise of the LP38798SD-ADJ/NOPB?
The output noise is 5 µV RMS (10 Hz to 100 kHz). - What is the PSRR of the LP38798SD-ADJ/NOPB at 10 kHz and 100 kHz?
The PSRR is 90 dB at 10 kHz and 60 dB at 100 kHz. - What type of output capacitors is the LP38798SD-ADJ/NOPB stable with?
The LP38798SD-ADJ/NOPB is stable with both ceramic and tantalum output capacitors. - What is the minimum output capacitance required for stability?
The minimum output capacitance required is 1 µF. - Does the LP38798SD-ADJ/NOPB have overtemperature protection?
Yes, it has current limit and overtemperature protection features. - What is the operating temperature range of the LP38798SD-ADJ/NOPB?
The operating temperature range is -40°C to 125°C. - Can the LP38798SD-ADJ/NOPB be used in post-regulation applications?
Yes, it is well-suited for many post-regulation applications. - Is the LP38798SD-ADJ/NOPB compatible with the WEBENCH Power Designer?
Yes, it is compatible with the WEBENCH Power Designer for custom designs.
