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LP3982 Datasheet(PDF) 9 Page - Texas Instruments |
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LP3982 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 28 page OFF THERMAL PROTECTION 1.25-V BANDGAP FAST START-UP CIRCUIT CURRENT LIMIT FAULT COMPARATORS R1 R2 IN OUT SET CC SHDN FAULT GND ERROR AMP + - LP3982 www.ti.com SNVS185E – FEBRUARY 2002 – REVISED OCTOBER 2015 7 Detailed Description 7.1 Overview The LP3982 is package, pin, and performance compatible with Maxim's MAX8860, excluding reverse battery protection and dual-mode function (fixed and adjustable combined). A 1.25-V bandgap reference, an error amplifier, and a PMOS pass transistor perform voltage regulation while being supported by shutdown, fault, and the usual temperature and current protection circuitry (see Functional Block Diagram). The regulator topology is the classic type with negative feedback from the output to one of the inputs of the error amplifier. Feedback resistors R1 and R2 are either internal or external to the device, depending on whether it is the fixed-voltage version or the adjustable version. The negative feedback and high open loop gain of the error amplifier cause the two inputs of the error amplifier to be virtually equal in voltage. If the output voltage changes due to load changes, the error amplifier provides the appropriate drive to the pass transistor to maintain the error amplifier's inputs as virtually equal. In short, the error amplifier keeps the output voltage constant in order to keep its inputs equal. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 No-Load Stability The LP3982 remains stable during no-load conditions, a necessary feature for CMOS RAM keep-alive applications. 7.3.2 Fast Start-Up The LP3982 provides fast start-up time for better system efficiency. The start-up speed is maintained when using the optional noise bypass capacitor. An internal 500- μA current source charges the capacitor until it reaches about 90% of its final value. Copyright © 2002–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LP3982 |
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