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LP2981-33DBVTE4 Datasheet(PDF) 10 Page - Texas Instruments

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Part # LP2981-33DBVTE4
Description  100-mA Ultra-Low Dropout Regulators With Shutdown
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP2981-33DBVTE4 Datasheet(HTML) 10 Page - Texas Instruments

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VOUT
3.3 …F
(see Note A)
1 …F
(see Note A)
VIN
1
ON/OFF
(see Note B)
2
GND
3
5
4
NC
(see Note C)
LP2981
Copyright © 2016, Texas Instruments Incorporated
10
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
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The LP2981 is a linear voltage regulator operating from 2.1 V to 16 V on the input and regulates voltages
between 2.5 V to 5 V with 0.75% accuracy and 100-mA maximum output current. Efficiency is defined by the
ratio of output voltage to input voltage because the LP2981 is a linear voltage regulator. To achieve high
efficiency, the dropout voltage (VIN – VOUT) must be as small as possible, thus requiring a very-low-dropout LDO.
Successfully implementing an LDO in an application depends on the application requirements. If the
requirements are simply input voltage and output voltage, compliance specifications (such as internal power
dissipation or stability) must be verified to ensure a solid design. If timing, start-up, noise, power supply rejection
ratio (PSRR), or any other transient specification is required, then the design becomes more challenging.
8.2 Typical Application
A.
Minimum COUT value for stability (can be increased without limit for improved stability and transient response)
B.
ON/OFF must be actively terminated. Connect to VIN if shutdown feature is not used.
C.
Pin 4 (NC) must be left open. Do not connect anything to this pin.
Figure 4. LP2981 Typical Application
8.2.1 Design Requirements
Table 1 lists the parameters for this application.
Table 1. Design Parameters
PARAMETER
DESIGN REQUIREMENT
Input voltage
5 V ±10%, provided by an external regulator
Output voltage
3.3 V ±5%
Output current
100 mA (maximum), 1 mA (minimum)
RMS noise, 300 Hz to 50kHz
< 1 mVRMS
PSRR at 1kHz
> 40 dB


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