|Information||400mA Low Dropout Voltage Regulator (LDOs)|
|VOUT Adj MIN (V)||-|
|VOUT Adj MAX (V)||-|
|VIN MIN (V)||4.1|
|VIN MAX (V)||30|
|Features||Enable,Power Good,Current limit and thermal protection|
|Junction Temp Range (°C)||-40 to 125|
|Accuracy (%)||0.5%, 1%|
|Output Noise (µVRMS)||260|
The SPX2945 is a low power voltage regulator. This device is an excellent choice for use in battery powered applications such as cordless telephones, radio control systems and portable computers. The SPX2945 features very low quiescent current (100μA typical) and very low dropout voltage. This includes a tight initial tolerance of 1% max and very low output temperature coefficient, making the SPX2945 useful as a low power voltage reference.
The error flag output feature is used as power-on reset for warning of a low output voltage, due to a falling voltage input of batteries. Another feature is the logic-compatible shutdown input which enables the regulator to be switched on and off. The SPX2945 is offered in 3-pin TO-220 package, SO-8 (same pinout as SPX2951), SOT-223, surface mount 3-pin TO-252, 3-pin TO-263 packages and 5-pin TO-263.
The regulator output voltage (of the 8-pin SO-8) may be pin-strapped for a 3.3V and 5.0V or programmed from 1.24V to 20V with an external pair of resistors. Look for SPX2951 for 150mA and SPX2954 for 250mA applications.
- Output 3.3V, 5.0V at 400mA output
- Very low quiescent current, 100µA
- Low dropout voltage, 420mV at 400mA
- Extremely tight load and line regulation
- Very low temperature coefficient
- Current and thermal limiting
- Error flag warns of output dropout
- Logic controlled electronic shutdown
- Output programmable from 1.24V to 20V (for SO-8)
Documentation & Design Tools
|Data Sheets||SPX2945 400mA Low Dropout Voltage Regulator with Shutdown||1.0.0||April 2006||229.6 KB|
|Application Notes||AN200, Downloading and Installing CAD Symbols and Footprints with Ultra Librarian||April 2019||1.2 MB|
|Product Brochures||Power Management Brochure||October 2020||2.4 MB|
|Symbols & Footprints||SPX2945M3-L-3-3/TR CAD File (.bxl)||September 2018||65.9 KB|
Quality & RoHS
|Part Number||RoHS | Exempt||RoHS||Halogen Free||REACH||TSCA||MSL Rating / Peak Reflow||Package|
|SPX2945M3-L-3-3/TR||N||Y||Y||Y||Y||L1 / 260ᵒC||SOT-223-3|
Click on the links above to download the Certificate of Non-Use of Hazardous Substances.
Parts & Purchasing
|Part Number||Pkg Code||Min Temp||Max Temp||Status||Suggested Replacement||Buy Now||Order Samples||PDN|
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.
FAQs & Support
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In this example, we looked for XRA1201. Click on part number header or on the link at the bottom of the result. This brings you to the product page. For example:
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Notice the status column and the “Show obsolete parts” link. A legend tells you the definition of the different statuses. Click on the “Show obsolete parts” link to see EOL or OBS part numbers along with the Active part numbers, the legend still present:
Another method to find out if a part is OBS or EOL is to click on SUPPORT at the top:
And then Product Change Notifications:
Type the part into the search, and click on one of the part numbers from the drop down menu. Then you can look for the Product Discontinuation Notice, which generally is at the top of the list, for example:
If you see this, it tells you that this particular orderable part has been discontinued and when the last order date is, or was. If you click on the file, then you can view the notice we sent about this if you purchased the part in the recent past. It may also advise of a replacement part. When an orderable part first becomes discontinued, Product Discontinuation Notices are sent are sent to those who have purchased the parts in the recent past, if purchased directly, with a dated opportunity to place a last order.