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LP5910 Scheda tecnica(PDF) 11 Page - Texas Instruments |
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LP5910 Scheda tecnica(HTML) 11 Page - Texas Instruments |
11 / 35 page Current limit EA Bandgap IN OUT VIN EN Control EN Output discharge GND 11 LP5910 www.ti.com SNVSA91E – SEPTEMBER 2015 – REVISED JULY 2017 Product Folder Links: LP5910 Submit Documentation Feedback Copyright © 2015–2017, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The LP5910 is a linear regulator capable of supplying 300-mA output current. Designed to meet the requirements of RF and analog circuits, the LP5910 device provides low noise, high PSRR, low quiescent current, and low line/load transient response figures. Using new innovative design techniques the LP5910 offers class-leading noise performance without a noise bypass capacitor and the option for remote output capacitor placement. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 No-Load Stability The LP5910 remains stable and in regulation with no external load. 7.3.2 Thermal Overload Protection The LP5910 contains a thermal shutdown protection circuit to turn off the output current when excessive heat is dissipated in the LDO. Thermal shutdown occurs when the thermal junction temperature (TJ) of the main pass- FET exceeds 160°C (typical). Thermal shutdown hysteresis assures that the LDO again resets (turns on) when the temperature falls to 145°C (typical). 7.3.3 Short-Circuit Protection The LP5910 contains internal current limit which reduces output current to a safe value if the output is overloaded or shorted. Depending upon the value of VIN, thermal limiting may also become active as the average power dissipated causes the die temperature to increase to the limit value (about 160°C). The hysteresis of the thermal shutdown circuitry can result in a cyclic behavior on the output as the die temperature heats and cools. 7.3.4 Output Automatic Discharge The LP5910 output employs an internal 160-Ω (typical) pulldown resistance to discharge the output when the EN pin is low, and the device is disabled. |
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Descrizione simile - LP5910_V02 |
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