Overview
The LP38798SDE-ADJ/NOPB is a high-performance, ultra-low-noise linear voltage regulator produced by Texas Instruments. This device is designed to supply up to 800 mA of output current and is particularly suited for applications requiring low noise and high power supply rejection ratio (PSRR). The LP38798-ADJ uses an advanced CMOS process to deliver ultra-low output noise and high PSRR at switching power supply frequencies, making it ideal for sensitive RF and analog circuitry.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 3 V to 20 V | V |
| Output Current | Up to 800 mA | mA |
| Output Noise (10 Hz to 100 kHz) | 5 µVRMS | µV |
| PSRR at 10 kHz | 90 dB | dB |
| PSRR at 100 kHz | 60 dB | dB |
| Output Voltage Initial Accuracy (TJ = 25°C) | ±1% | % |
| Dropout Voltage (Typical) at 800 mA | 200 mV | mV |
| Operating Temperature Range | -40°C to 125°C | °C |
| Package Type | WSON (12-pin) | - |
| Package Size | 4.00 mm × 4.00 mm | mm |
Key Features
- Ultra-low output noise: 5 µVRMS (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 ceramic or tantalum output capacitors
- Excellent line and load transient response
- Current limit and overtemperature protection
- Internal noise filter with a low-pass RC filter
- Programmable output voltage using external resistors
Applications
- RF Power Supplies: PLLs, VCOs, Mixers, LNAs
- Telecom Infrastructure
- Wireless Infrastructure
- Very Low-Noise Instrumentation
- Precision Power Supplies
- High-Speed, High-Precision Data Converters
Q & A
- What is the input voltage range of the LP38798SDE-ADJ/NOPB?
The input voltage range is from 3 V to 20 V.
- What is the maximum output current of the LP38798SDE-ADJ/NOPB?
The maximum output current is up to 800 mA.
- What is the output noise level of the LP38798SDE-ADJ/NOPB?
The output noise level is 5 µVRMS (10 Hz to 100 kHz).
- What is the PSRR of the LP38798SDE-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 can be used with the LP38798SDE-ADJ/NOPB?
The device is stable with both ceramic and tantalum output capacitors.
- Does the LP38798SDE-ADJ/NOPB have thermal protection?
- How is the output voltage programmed in the LP38798SDE-ADJ/NOPB?
The output voltage is programmed using external resistors R1 and R2 connected to the SET pin.
- What is the recommended minimum output capacitance for the LP38798SDE-ADJ/NOPB?
The recommended minimum output capacitance is 1 µF, but 10 µF is strongly recommended for fast load transient conditions.
- What are the key applications of the LP38798SDE-ADJ/NOPB?
Key applications include RF power supplies, telecom and wireless infrastructure, low-noise instrumentation, precision power supplies, and high-speed data converters.
- What is the operating temperature range of the LP38798SDE-ADJ/NOPB?
The operating temperature range is from -40°C to 125°C.
