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LP38855 Datasheet(PDF) 9 Page - Texas Instruments |
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LP38855 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 20 page LP38855-x.x GND OUT IN BIAS EN Under-Voltage Lock-Out Thermal Shut Down 1.2V Enable VREF 0.6V ILIMIT rEN LP38855 www.ti.com SNVS461D – OCTOBER 2006 – REVISED APRIL 2013 Block Diagram APPLICATION INFORMATION EXTERNAL CAPACITORS To assure regulator stability, capacitors are required on the input, output and bias pins as shown in the Typical Application Circuit. Output Capacitor A minimum output capacitance of 10 µF, ceramic, is required for stability. The amount of output capacitance can be increased without limit. The output capacitor must be located less than 1 cm from the output pin of the IC and returned to the device ground pin with a clean analog ground. Only high quality ceramic types such as X5R or X7R should be used, as the Z5U and Y5F types do not provide sufficient capacitance over temperature. Tantalum capacitors will also provide stable operation across the entire operating temperature range. However, the effects of ESR may provide variations in the output voltage during fast load transients. Using the minimum recommended 10 µF ceramic capacitor at the output will allow unlimited capacitance, Tantalum and/or Aluminum, to be added in parallel. Input Capacitor The input capacitor must be at least 10 µF, but can be increased without limit. It's purpose is to provide a low source impedance for the regulator input. A ceramic capacitor, X5R or X7R, is recommended. Tantalum capacitors may also be used at the input pin. There is no specific ESR limitation on the input capacitor (the lower, the better). Aluminum electrolytic capacitors can be used, but are not recommended as their ESR increases very quickly at cold temperatures. They are not recommended for any application where the ambient temperature falls below 0°C. Copyright © 2006–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LP38855 |
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