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LP38511 Datasheet(PDF) 9 Page - Texas Instruments |
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LP38511 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 20 page GND IN EN LP38511 Thermal Limit Current Limit ERROR VREF VREF OUT LP38511 www.ti.com SNOSAU6E – NOVEMBER 2007 – REVISED APRIL 2013 BLOCK DIAGRAM APPLICATION INFORMATION EXTERNAL CAPACITORS Like any low-dropout regulator, external capacitors are required to assure stability. These capacitors must be correctly selected for proper performance. Input Capacitor A ceramic input capacitor of at least 10 µF is required. For general usage across all load currents and operating conditions, a 10 µF ceramic input capacitor will provide satisfactory performance. Output Capacitor A ceramic capacitor with a minimum value of 10 µF is required at the output pin for loop stability. It must be located less than 1 cm from the device and connected directly to the output and ground pin using traces which have no other currents flowing through them. As long as the minimum of 10 µF ceramic is met, there is no limitation on any additional capacitance. X7R and X5R dielectric ceramic capacitors are strongly recommended, as they typically maintain a capacitance range within ±20% of nominal over full operating ratings of temperature and voltage. Of course, they are typically larger and more costly than Z5U/Y5U types for a given voltage and capacitance. Z5U and Y5V dielectric ceramics are not recommended as the capacitance will drops severely with applied voltage. A typical Z5U or Y5V capacitor can lose 60% of its rated capacitance with half of the rated voltage applied to it. The Z5U and Y5V also exhibit a severe temperature effect, losing more than 50% of nominal capacitance at high and low limits of the temperature range. REVERSE VOLTAGE A reverse voltage condition will exist when the voltage at the output pin is higher than the voltage at the input pin. Typically this will happen when VIN is abruptly taken low and COUT continues to hold a sufficient charge such that the input to output voltage becomes reversed. A less common condition is when an alternate voltage source is connected to the output. There are two possible paths for current to flow from the output pin back to the input during a reverse voltage condition. Copyright © 2007–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LP38511 |
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