LP3990MF-1.5 Texas Instruments Integrated Circuit (Other) In Stock
Texas Instruments LP3990MF-1.5 is a fixed 1.5 V output, ultra-low-noise CMOS LDO linear voltage regulator capable of sourcing up to 150 mA from inputs between 2.2 V and 5.5 V in a tiny SOT-23-5 package. It delivers only 40 µA quiescent current and 30 µVrms output noise, making it ideal for noise-sensitive RF and analog circuits. Available from stock worldwide with fast shipping.
- Manufacturer
- Texas Instruments
- Package
- Other
- Pin Count
- 5
- Lifecycle
- OBSOLETE
- Datasheet
- LP3990MF-1.5 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LP3990MF-1.5?
- Fixed 1.5 V output LDO with only 40 µA quiescent current for extended battery runtime in portable devices
- Ultra-low 30 µVrms output noise floor enabling use in noise-sensitive RF front-ends and precision analog circuits
- Wide 2.2 V to 5.5 V input range in a compact SOT-23-5 package supporting diverse portable and IoT supply architectures
What is LP3990MF-1.5 used for?
The LP3990MF-1.5 is suited for powering RF transceivers, low-noise amplifiers, and precision ADC reference circuits in portable communications and measurement equipment where power supply noise directly degrades signal integrity. Its 150 mA output capability covers most single-IC analog payloads, and the 40 µA quiescent current minimizes idle power drain in battery-operated sensor nodes. The fixed 1.5 V output simplifies BOM by eliminating external feedback resistors needed with adjustable regulators.
What are the specifications of LP3990MF-1.5?
| YTEOL | 0 |
| Regulator Type | FIXED POSITIVE SINGLE OUTPUT STANDARD REGULATOR |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the LP3990MF-1.5 datasheet?
LP3990MF-1.5 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for LP3990MF-1.5?
Compatible alternatives and drop-in replacements for LP3990MF-1.5:
Frequently Asked Questions
What output voltage and maximum current does the LP3990MF-1.5 provide?
The LP3990MF-1.5 delivers a fixed 1.5 V output at up to 150 mA from an input voltage range of 2.2 V to 5.5 V. The fixed-output architecture eliminates external resistor dividers, simplifying the design and reducing component count, which is particularly valuable in space-constrained PCBs powering RF modules and analog sensors requiring a stable 1.5 V reference rail.
How does LP3990MF-1.5's 30 µVrms noise compare to a standard LDO for powering an RF VCO at 1.5 V?
A typical general-purpose LDO exhibits output noise of 100–300 µVrms, which can phase-modulate a VCO and degrade phase noise by 5–10 dBc/Hz at 10 kHz offset. The LP3990MF-1.5's 30 µVrms noise is 3 to 10 times lower, reducing sideband noise injection into the VCO supply pin and improving overall synthesizer phase noise performance, making it the preferred choice for cellular, Bluetooth, and GPS front-end supply rails.
Can LP3990MF-1.5 operate directly from a single Li-ion cell, and what dropout voltage should designers account for?
A single Li-ion cell with a discharge range of 3.0 V to 4.2 V comfortably exceeds the LP3990MF-1.5's 2.2 V minimum input, so direct operation is feasible across the full battery discharge cycle. The typical dropout voltage is approximately 270 mV at 150 mA output current, meaning the regulator maintains its 1.5 V output down to a cell voltage of about 1.77 V, well within the usable discharge range of most Li-ion chemistries.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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