Overview
The Texas Instruments LP3985IM5-2.8/NOPB is a 150-mA, low-dropout voltage regulator designed for portable and wireless applications that demand high performance and minimal space. This regulator is optimized for battery-powered systems, offering ultra-low noise, extremely low dropout voltage, and low quiescent current. It is part of the LP3985 series, which is known for its stability with small ceramic or high-quality tantalum output capacitors, making it ideal for mobile phones and similar battery-powered wireless devices.
Key Specifications
| Category | Description |
|---|---|
| Manufacturer | Texas Instruments |
| Part Number | LP3985IM5-2.8/NOPB |
| Package | SOT-23-5 |
| Output Voltage | Fixed 2.8V |
| Output Current | 150mA |
| Input Voltage Range | 2.5V to 6V |
| Voltage Dropout (Max) | 0.1V @ 150mA |
| Quiescent Current (Max) | 150 µA |
| Operating Temperature Range | -40°C to 125°C |
| PSRR | 50dB @ 1kHz |
| Protection Features | Over Current, Over Temperature, Short Circuit |
| Enable Feature | Logic Controlled Enable |
Key Features
The LP3985IM5-2.8/NOPB features several key attributes that make it suitable for demanding applications:
- Low Dropout Voltage: Maximum dropout voltage of 0.1V at 150mA load.
- High PSRR: Power supply rejection ratio better than 50 dB at low frequencies.
- Low Quiescent Current: Less than 1.5 µA in shutdown mode.
- Fast Turn-On Time: Less than 200 µs.
- Output Noise: 30-µV RMS output noise over 10 Hz to 100 kHz.
- Stability with Small Capacitors: Stable with 1-µF ±30% ceramic or high-quality tantalum output capacitors.
- Protection Features: Includes overcurrent, overtemperature, and short-circuit protection.
- Logic Controlled Enable: Allows for easy control of the regulator.
Applications
The LP3985IM5-2.8/NOPB is particularly suited for:
- Portable and Wireless Devices: Ideal for mobile phones, tablets, and other battery-powered wireless applications due to its low noise, low dropout voltage, and low quiescent current.
- Battery-Powered Systems: Optimized to prolong battery life by minimizing ground current increase in dropout conditions.
- Space-Constrained Designs: The SOT-23-5 package and the ability to use small output capacitors make it suitable for applications where space is limited.
Q & A
- What is the maximum output current of the LP3985IM5-2.8/NOPB?
The maximum output current is 150mA.
- What is the input voltage range for this regulator?
The input voltage range is from 2.5V to 6V.
- What is the maximum dropout voltage at 150mA load?
The maximum dropout voltage is 0.1V at 150mA load.
- Does the LP3985IM5-2.8/NOPB have any protection features?
Yes, it includes overcurrent, overtemperature, and short-circuit protection.
- What is the quiescent current in shutdown mode?
The quiescent current is less than 1.5 µA in shutdown mode.
- How long is the turn-on time for this regulator?
The turn-on time is less than 200 µs.
- Is the LP3985IM5-2.8/NOPB RoHS compliant?
Yes, it is RoHS compliant.
- What type of capacitors can be used with this regulator?
The regulator is stable with 1-µF ±30% ceramic or high-quality tantalum output capacitors.
- What is the operating temperature range for this device?
The operating temperature range is -40°C to 125°C.
- Does the LP3985IM5-2.8/NOPB have an enable feature?
Yes, it has a logic-controlled enable feature).
