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LP2981A-28DBVT Datasheet(PDF) 8 Page - Texas Instruments

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Part # LP2981A-28DBVT
Description  100-mA Ultra-Low Dropout Regulators With Shutdown
Download  22 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP2981A-28DBVT Datasheet(HTML) 8 Page - Texas Instruments

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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
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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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