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LP2981-33DBVTE4 Datasheet(PDF) 10 Page - Texas Instruments |
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LP2981-33DBVTE4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 22 page 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 Submit Documentation Feedback 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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