Overview
The LP38798SDX-ADJ/NOPB is a high-performance, low-noise Linear Voltage Regulator (LDO) manufactured by Texas Instruments. This adjustable LDO is designed to meet the stringent requirements of sensitive RF and analog circuitry. It utilizes a novel linear topology on an advanced CMOS process to deliver ultra-low output noise and high Power Supply Rejection Ratio (PSRR) at switching power supply frequencies. The LP38798SDX-ADJ/NOPB can supply up to 800 mA of output current and is stable with both ceramic and tantalum output capacitors, requiring a minimum output capacitance of only 1 µF for stability.
Key Specifications
| Parameter | Value |
|---|---|
| Package | WSON (DNT) with 12 pins |
| Operating 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 |
| Operating Temperature Range | -40°C to 125°C |
| Output Capacitor Stability | Stable with ceramic or tantalum capacitors, minimum 1 µF |
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
- ±1% output voltage initial accuracy at TJ = 25°C
- Very low dropout voltage: 200 mV (Typical) at 800 mA
- Stable with ceramic or tantalum output capacitors
- Excellent line and load transient response
- Current limit and overtemperature protection
- Custom design capability using the WEBENCH Power Designer
Applications
The LP38798SDX-ADJ/NOPB is well-suited for various applications requiring low noise and high PSRR, including:
- Sensitive RF and analog circuitry
- Post-regulation applications
- High-performance audio and video systems
- Medical devices requiring low noise power supplies
- Industrial control systems
Q & A
- What is the maximum output current of the LP38798SDX-ADJ/NOPB? The maximum output current is up to 800 mA.
- What is the operating input voltage range of the LP38798SDX-ADJ/NOPB? The operating input voltage range is from 3 V to 20 V.
- What is the output noise of the LP38798SDX-ADJ/NOPB? The output noise is 5 µV RMS (10 Hz to 100 kHz).
- What is the PSRR of the LP38798SDX-ADJ/NOPB? The PSRR is 90 dB at 10 kHz and 60 dB at 100 kHz.
- What type of output capacitors is the LP38798SDX-ADJ/NOPB stable with? It 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 LP38798SDX-ADJ/NOPB have overtemperature protection? Yes, it includes current limit and overtemperature protection.
- Can the LP38798SDX-ADJ/NOPB be used in high-performance audio systems? Yes, it is suitable for high-performance audio and video systems due to its low noise and high PSRR.
- What tool can be used to create a custom design with the LP38798SDX-ADJ/NOPB? The WEBENCH Power Designer can be used to create custom designs.
- What is the operating temperature range of the LP38798SDX-ADJ/NOPB? The operating temperature range is -40°C to 125°C.
