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LP38513S-1.8 Datasheet(PDF) 10 Page - Texas Instruments |
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LP38513S-1.8 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 25 page GND IN EN LP38513 Thermal Limit Current Limit ERROR VREF VREF OUT LP38513 SNVS361E – JULY 2007 – REVISED NOVEMBER 2015 www.ti.com 7 Detailed Description 7.1 Overview The LP38513 is a fast response, ultra-low-dropout linear regulator that operates from a 2.25-V to 5.5-V input supply. This linear regulator responds very quickly to step changes in line or load conditions, making it suitable for low-voltage microprocessor applications. The device has low quiescent current operation that is independent of the output load current, and it has an ERROR flag pin, which can indicate that VOUT is within 15% of the nominal regulated voltage. The LP38513 is designed to perform with a10-µF (minimum value) input capacitor and a 10-µF (minimum value) output capacitor. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Short-Circuit Protection The LP38513 is short-circuit protected and, in the event of a peak overcurrent condition, the short-circuit control loop rapidly drives the output PMOS pass element off. Once the power pass element shuts down, the control loop rapidly cycles the output on and off until the average power dissipation causes the thermal shutdown circuit to respond to servo the on/off cycling to a lower frequency. Refer to the Power Dissipation section for power dissipation calculations. 7.3.2 Enable LP38513 has an EN pin to enable/disable the device. If the application does not require the enable function, the pin must be connected directly to the adjacent IN pin. The status of the EN pin also affects the behavior of the ERROR flag. While the EN pin is high the regulator control loop is active, and the ERROR flag reorts the status of the output voltage. When the EN pin is taken low the regulator control loop is shut down, the output is turned off, and the internal logic immediately forces the ERROR flag pin low. 7.3.3 ERROR Flag When the LP38513 EN pin is high, the ERROR flag pin produces a logic low signal when the output drops by more than 15% (VTH, typical) from the nominal output voltage. The drop in output voltage may be due to low input voltage, current limiting, or thermal limiting. This flag has a built-in hysteresis. The output voltage must to rise to greater than typically 89% of the nominal output voltage for the ERROR flag to return to a logic high state. Also, if the EN pin is pulled low, the ERROR flag pin is forced to low as well. 10 Submit Documentation Feedback Copyright © 2007–2015, Texas Instruments Incorporated Product Folder Links: LP38513 |
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