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TLV71728PDQNT Datasheet(PDF) 9 Page - Texas Instruments |
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TLV71728PDQNT Datasheet(HTML) 9 Page - Texas Instruments |
9 / 28 page Foldback Current Limit UVLO Bandgap IN EN OUT LOGIC 120 W GND Copyright © 2016, Texas Instruments Incorporated 9 TLV717P www.ti.com SBVS176B – OCTOBER 2011 – REVISED APRIL 2016 Product Folder Links: TLV717P Submit Documentation Feedback Copyright © 2011–2016, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The TLV717P belongs to a new family of next-generation value low-dropout (LDO) regulators. These devices consume low quiescent current and deliver excellent line and load transient performance. These characteristics, combined with low noise, very good PSRR with little (VIN – VOUT) headroom, make this family of devices ideal for RF portable applications. This family of regulators offers current foldback. Device operating junction temperature is –40°C to 85°C. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Internal Current Limit The TLV717P has an internal foldback current limit that helps to protect the regulator during fault conditions. The current supplied by the device is gradually throttled down as the output voltage decreases. When the output is shorted, the LDO supplies a typical current of 40 mA. Output voltage is not regulated when the device is in current limit, and is VOUT = ILIMIT × RLOAD. The advantage of foldback current limit is that the ILIMIT value is less than the fixed current limit. Therefore, the power that the PMOS pass transistor dissipates [(VIN – VOUT) × ILIMIT] is much less. The TLV717P PMOS pass element has a built-in body diode that conducts current when the voltage at OUT exceeds the voltage at IN. This current is not limited, so if extended reverse voltage operation is anticipated, external limiting to 5% of the rated output current is recommended. |
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