Overview
The LDLN025PU28R is a 250 mA ultra-low noise Low-Dropout (LDO) 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 an output voltage of 2.8 V with a tolerance of 2%. The LDLN025PU28R is notable for its ultra-low output noise of 6.5 μV RMS, making it suitable for noise-sensitive applications such as Analog-to-Digital Converters (ADC), Voltage-Controlled Oscillators (VCO) in mobile phones and tablets, and wireless LAN devices. The device features a very low quiescent current of 12 μA at no-load, which extends the battery life of applications requiring long standby times. It also 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) | 2.8 | V |
| Output Voltage Tolerance | ±2% | % |
| Output Current (maximum) | 250 | mA |
| Quiescent Current (no-load) | 12 | μA |
| Dropout Voltage (at 250 mA) | 120 | mV |
| Output Noise (RMS) | 6.5 | μV |
| PSRR (at 100 Hz and 100 kHz) | 80 dB and 60 dB | dB |
| Temperature Range | -40 to +125 | °C |
| Package | DFN4-1x1 |
Key Features
- Ultra-low output noise: 6.5 μV RMS
- Operating input voltage range: 1.5 V to 5.5 V
- Output current up to 250 mA
- Very low quiescent current: 12 μA at no-load
- Controlled quiescent current in dropout condition
- Very low dropout voltage: 120 mV at 250 mA
- Very 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 ADC and VCO in mobile phones and tablets
- Wireless LAN devices
- Image sensors
- Instrumentation
- RF modules
Q & A
- What is the input voltage range of the LDLN025PU28R?
The input voltage range is from 1.5 V to 5.5 V.
- What is the nominal output voltage of the LDLN025PU28R?
The nominal output voltage is 2.8 V.
- What is the maximum output current of the LDLN025PU28R?
The maximum output current is 250 mA.
- What is the quiescent current at no-load for the LDLN025PU28R?
The quiescent current at no-load is 12 μA.
- What is the dropout voltage at 250 mA load for the LDLN025PU28R?
The dropout voltage at 250 mA load is typically 120 mV.
- What is the output noise of the LDLN025PU28R?
The output noise is 6.5 μV RMS.
- What are the key protection features of the LDLN025PU28R?
The device includes overcurrent and thermal protections, as well as logic-controlled electronic shutdown and output discharge feature.
- What are the typical applications for the LDLN025PU28R?
Typical applications include noise-sensitive loads such as ADC, VCO in mobile phones and tablets, wireless LAN devices, image sensors, instrumentation, and RF modules.
- What is the temperature range for the LDLN025PU28R?
The operating temperature range is from -40 °C to +125 °C.
- What package options are available for the LDLN025PU28R?
The device is available in a DFN4-1x1 package.
