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LP4950C-5V Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LP4950C-5V Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 14 page  LP4950C-5V and LP4951C Adjustable Micropower Voltage Regulators General Description The LP4950C and LP4951C are micropower voltage regu- lators with very low quiescent current (75µA typ.) and very low dropout voltage (typ. 40mV at light loads and 380mV at 100mA). They are ideally suited for use in battery-powered systems. Furthermore, the quiescent current of the LP4950C/LP4951C increases only slightly in dropout, pro- longing battery life. The LP4950C in the popular 3-pin TO-92 package is pin compatible with older 5V regulators. The 8-lead LP4951C is available in a plastic surface mount package and offers additional system functions. One such feature is an error flag output which warns of a low output voltage, often due to falling batteries on the input. It may be used for a power-on reset. A second feature is the logic-compatible shutdown input which enables the regulator to be switched on and off. Also, the part may be pin-strapped for a 5V output or programmed from 1.24V to 29V with an external pair of resistors. Careful design of the LP4950C/LP4951C has minimized all contributions to the error budget. This includes a tight initial tolerance (.5% typ.), extremely good load and line regulation (.05% typ.) and a very low output voltage temperature coef- ficient, making the part useful as a low-power voltage refer- ence. Features n High accuracy 5V guaranteed 100mA output n Extremely low quiescent current n Low dropout voltage n Extremely tight load and line regulation n Very low temperature coefficient n Use as Regulator or Reference n Needs only 1µF for stability n Current and Thermal Limiting LP4951C versions only n Error flag warns of output dropout n Logic-controlled electronic shutdown n Output programmable from 1.24 to 29V Block Diagram and Typical Applications LP4950C LP4951C 20052825 20052801 September 2002 © 2002 National Semiconductor Corporation DS200528 www.national.com |
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