LP3990 - Voltage regulator TEXAS INSTRUMENTS - Free user manual and instructions
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| Product Type | Low Dropout Linear Voltage Regulator (LDO) |
| Output Current | 150 mA |
| Input Voltage Range | 2.5 V to 6.5 V |
| Output Voltage Options | Fixed: 1.2 V, 1.5 V, 1.8 V, 2.5 V, 2.8 V, 3.0 V, 3.3 V; Adjustable: 0.6 V to 5.5 V |
| Dropout Voltage | 300 mV at 150 mA (typical) |
| Quiescent Current | 25 µA (typical) |
| Output Noise | 30 µV RMS (typical) |
| Power Supply Rejection Ratio (PSRR) | 60 dB at 100 Hz |
| Enable Pin | Yes, active high |
| Package Type | SOT-23-5, SOT-23-3 (depending on version) |
| Operating Temperature Range | -40°C to +125°C |
| Protection Features | Overcurrent protection, thermal shutdown |
| Output Capacitor Stability | Stable with ceramic capacitors (1 µF typical) |
| Dimensions (SOT-23-5) | 2.9 mm x 1.6 mm x 1.1 mm (approx.) |
| Weight (SOT-23-5) | Approx. 15 mg |
| Mounting Type | Surface Mount |
| Compliance | RoHS |
Frequently Asked Questions - LP3990 TEXAS INSTRUMENTS
What is the LP3990?
The LP3990 is a low dropout linear voltage regulator designed by Texas Instruments. It provides a stable output voltage up to 150 mA with low quiescent current.
What input voltage range does the LP3990 support?
The LP3990 operates with an input voltage range of 2.5 V to 6.5 V.
How do I choose the output voltage?
The output voltage can be selected from fixed options (e.g., 1.2 V, 1.8 V, 3.3 V) or set using an external resistor divider for adjustable versions.
What is the dropout voltage?
The typical dropout voltage is 300 mV at 150 mA load.
What capacitors are recommended for stability?
Texas Instruments recommends a 1 µF ceramic capacitor on the output and a 1 µF capacitor on the input for stability.
Does the LP3990 have thermal shutdown?
Yes, the LP3990 includes thermal shutdown protection to prevent damage from overheating.
How much quiescent current does the LP3990 consume?
The quiescent current is typically 25 µA.
Can I use the LP3990 with an enable pin?
Yes, the LP3990 has an active-high enable pin that allows the regulator to be turned on and off.
What package options are available?
The LP3990 is available in SOT-23-5 and SOT-23-3 packages.
What is the typical application for the LP3990?
It is commonly used in battery-powered devices, portable electronics, and noise-sensitive analog circuits due to its low noise and low dropout.
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USER MANUAL LP3990 TEXAS INSTRUMENTS
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Product information
Brand : TEXAS INSTRUMENTS
Model : LP3990
Category : Voltage regulator