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LP2981-50DBVTG4 Datasheet(PDF) 8 Page - Texas Instruments |
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LP2981-50DBVTG4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 22 page 8 LP2981-28, LP2981-29, LP2981-30 LP2981-33, LP2981-50, LP2981A-28 LP2981A-29, LP2981A-30, LP2981A-33, LP2981A-50 SLVS521G – JULY 2004 – REVISED AUGUST 2016 www.ti.com Product Folder Links: LP2981-28 LP2981-29 LP2981-30 LP2981-33 LP2981-50 LP2981A-28 LP2981A-29 LP2981A- 30 LP2981A-33 LP2981A-50 Submit Documentation Feedback Copyright © 2004–2016, Texas Instruments Incorporated Feature Description (continued) 7.3.3 Short-Circuit Protection (Current Limit) The internal current-limit circuit is used to protect the LDO against high-load current faults or shorting events. The LDO is not designed to operate in a steady-state current limit. During a current-limit event, the LDO sources constant current. Therefore, the output voltage falls when load impedance decreases. If a current limit occurs and the resulting output voltage is low, excessive power may be dissipated across the LDO resulting in a thermal shutdown of the output. A foldback feature limits the short-circuit current to protect the regulator from damage under all load conditions. If VOUT is forced below 0 V before ON/OFF goes high and the load current required exceeds the foldback current limit, the device may not start up correctly. 7.3.4 Capacitor Characteristics 7.3.4.1 Ceramic Due to their very low ESR values, ceramic capacitors are not suitable for use as the output capacitor. For instance, a typical 2.2-µF ceramic capacitor has an ESR in the range of 10 m Ω to 20 mΩ and, thus, easily can fall out of minimum ESR requirements under certain operating conditions. If a ceramic capacitor is used at the output, a 1- Ω resistor must be placed in series with the capacitor to raise the ESR seen by the regulator. 7.3.4.2 Tantalum Solid tantalum capacitors are optimal choices for the LP2981, but they still must meet the minimum ESR requirement. Note that the ESR of a tantalum capacitor increases as temperature drops, as much as doubling from 25°C to –40°C. Thus, ESR margins must be maintained over the temperature range to prevent regulator instability. For operation at very low temperatures, paralleling a tantalum capacitor with a ceramic one keeps the combined ESR from increasing near the upper limit of the ESR curve. 7.3.4.3 Aluminum Aluminum capacitors can be used, but use with the LP2981 is impractical due to their large physical dimensions. They also must meet the ESR requirements over the full temperature range. In this regard, aluminium capacitors are at a big disadvantage due to their sharp ESR increase as temperature drops. For example, over a temperature drop from 20°C to –40°C, the ESR of an aluminum electrolytic capacitor can increase by a factor of 50. In addition, some of the electrolytes used in these capacitors can freeze at –25°C, making the capacitor nonoperational. |
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