Overview
The Texas Instruments LP3985IM5-2.5/NOPB is a micropower, low-noise, ultra-low-dropout (LDO) voltage regulator designed for battery-powered wireless applications. This device is part of the LP3985 series and is specifically configured to provide a fixed output voltage of 2.5V. It is capable of delivering up to 150 mA of output current from an input voltage range of 2.5V to 6V. The LP3985IM5-2.5/NOPB features a low quiescent current, fast turn-on time, and high power supply rejection ratio (PSRR), making it ideal for applications requiring low noise and high stability.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage | 2.5 | V |
| Input Voltage Range | 2.5 to 6 | V |
| Output Current | Up to 150 | mA |
| Dropout Voltage | 60 | mV |
| Quiescent Current (VEN = 1.4V, IOUT = 0 to 150 mA) | 85 to 150 | µA |
| Power Supply Rejection Ratio (PSRR) at 1 kHz | Better than 50 dB | |
| Turn-On Time | Less than 200 µs | |
| Package Type | SOT-23-5 | |
| Body Size | 2.90 mm x 1.60 mm (NOM) |
Key Features
- Logic controlled enable and bypass capacitor for noise reduction.
- Stable with small 1-µF ±30% ceramic or high-quality tantalum output capacitors.
- Fast turn-on time of less than 200 µs.
- Thermal shutdown and short-circuit current limit for protection.
- High power supply rejection ratio (PSRR) better than 50 dB at low frequencies.
- Low quiescent current of less than 1.5 µA in disable mode.
Applications
- CDMA, Wideband CDMA, and GSM cellular handsets.
- Portable information appliances.
- Battery-powered wireless applications.
- Mobile phones and similar battery-operated devices.
Q & A
- What is the output voltage of the LP3985IM5-2.5/NOPB? The output voltage is fixed at 2.5V.
- What is the input voltage range for this regulator? The input voltage range is from 2.5V to 6V.
- How much output current can the LP3985IM5-2.5/NOPB provide? It can provide up to 150 mA of output current.
- What is the dropout voltage of this regulator? The dropout voltage is 60 mV.
- What is the quiescent current in disable mode? The quiescent current is less than 1.5 µA in disable mode.
- How fast is the turn-on time of the LP3985IM5-2.5/NOPB? The turn-on time is less than 200 µs.
- What type of capacitors is the LP3985IM5-2.5/NOPB stable with? It is stable with small 1-µF ±30% ceramic or high-quality tantalum output capacitors.
- Does the LP3985IM5-2.5/NOPB have any built-in protection features? Yes, it has thermal shutdown and short-circuit current limit for protection.
- What is the power supply rejection ratio (PSRR) of this regulator? The PSRR is better than 50 dB at low frequencies.
- In what package is the LP3985IM5-2.5/NOPB available? It is available in a SOT-23-5 package.
