Overview
The LDLN025PU33R is a 250 mA low-dropout voltage regulator produced by STMicroelectronics. This device is designed to operate with an input voltage range from 1.5 V to 5.5 V and provides a stable output voltage of 3.3 V. It is characterized by its ultra-low output noise and high power supply rejection ratio (PSRR), making it suitable for noise-sensitive applications such as ADCs, VCOs in mobile phones and tablets, and wireless LAN devices. The regulator features a very low quiescent current of 12 μA at no-load, which extends the battery life in applications requiring long standby times. Additionally, it includes logic-controlled electronic shutdown, output discharge feature, internal soft-start, and overcurrent and thermal protections.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Input Voltage Range | 1.5 to 5.5 | V |
| Output Voltage (nominal) | 3.3 | V |
| Output Voltage Tolerance | ±2% | % |
| Output Current (nominal) | 250 | mA |
| Quiescent Current at No-Load | 12 | μA |
| Dropout Voltage at 250 mA | 120 | mV |
| PSRR at 100 Hz / 100 kHz | 80 dB / 60 dB | dB |
| Output Noise (RMS) | 6.5 | μV |
| Operating Temperature Range | -40 to +125 | °C |
| Packages | Flip-Chip4, DFN4-1x1, SOT23-5L |
Key Features
- Ultra-low output noise: 6.5 μV RMS
- Very low quiescent current: 12 μA at no-load
- Controlled quiescent current in dropout condition
- Very low dropout voltage: 120 mV at 250 mA
- High PSRR: 80 dB @ 100 Hz, 60 dB @ 100 kHz
- Output voltage accuracy: ±2% across line, load, and temperature
- Logic-controlled electronic shutdown
- Output discharge feature
- Internal soft-start
- Overcurrent and thermal protections
- Stable with ceramic capacitors
Applications
- Noise-sensitive loads such as ADCs and VCOs in mobile phones and tablets
- Wireless LAN devices
- Image sensors
- Instrumentation
- RF modules
Q & A
- What is the input voltage range of the LDLN025PU33R?
The input voltage range is from 1.5 V to 5.5 V.
- What is the nominal output voltage of the LDLN025PU33R?
The nominal output voltage is 3.3 V.
- What is the maximum output current of the LDLN025PU33R?
The maximum output current is 250 mA.
- What is the quiescent current at no-load for the LDLN025PU33R?
The quiescent current at no-load is 12 μA.
- Does the LDLN025PU33R have overcurrent and thermal protections?
- What is the typical dropout voltage at 250 mA load for the LDLN025PU33R?
The typical dropout voltage at 250 mA load is 120 mV.
- What is the PSRR of the LDLN025PU33R at 100 Hz and 100 kHz?
The PSRR is 80 dB @ 100 Hz and 60 dB @ 100 kHz.
- Is the LDLN025PU33R stable with ceramic capacitors?
- What are the available package options for the LDLN025PU33R?
The available packages are Flip-Chip4, DFN4-1x1, and SOT23-5L.
- What is the operating temperature range of the LDLN025PU33R?
The operating temperature range is from -40 °C to +125 °C.
