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SLYZ022 Scheda tecnica(PDF) 10 Page - Texas Instruments |
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SLYZ022 Scheda tecnica(HTML) 10 Page - Texas Instruments |
10 / 22 page _ + Current Sense R 1 R 2 V IN GND V OUT I LIM Bandgap Reference V REF =1.205V R =840kW 2 TLV704 SBVS148D – OCTOBER 2010 – REVISED JANUARY 2015 www.ti.com 7 Detailed Description 7.1 Overview The TLV704 series belong to a family of ultralow IQ LDO regulators. IQ remains fairly constant over the complete output load current and temperature range. The devices are ensured to operate over a temperature range of –40°C to 125°C. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Regulator Protection The TLV704 series of LDO regulators use a PMOS-pass transistor that has a built-in back diode that conducts reverse current when the input voltage drops below the output voltage (for example, during power down). Current is conducted from the output to the input and is not internally limited. If extended reverse voltage operation is anticipated, external limiting is appropriate. The TLV704 features internal current limiting. During normal operation, the TLV704 limits output current to approximately 250 mA. When current limiting engages, the output voltage scales back linearly until the overcurrent condition ends. Do not exceed the rated maximum operating junction temperature of 125°C. Continuously running the device under conditions where the junction temperature exceeds 125°C degrades device reliability. The ability to remove heat from the die is different for each package type, presenting different considerations in the printed circuit board (PCB) layout. The PCB area around the device that is free of other components moves the heat from the device to the ambient air. Performance data for JEDEC high-K boards are given in the Thermal Information table. Using heavier copper increases the effectiveness in removing heat from the device. The addition of plated through-holes to heat-dissipating layers also improves heatsink effectiveness. Power dissipation depends on input voltage and load conditions. Power dissipation (PD) is equal to the product of the output current and the voltage drop across the output pass element, as shown in Equation 2. 10 Submit Documentation Feedback Copyright © 2010–2015, Texas Instruments Incorporated Product Folder Links: TLV704 |
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