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LP2975IMM-5.0 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LP2975IMM-5.0 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 19 page  LP2975 MOSFET LDO Driver/Controller General Description A high-current LDO regulator is simple to design with the LP2975 LDO Controller. Using an external P-FET, the LP2975 will deliver an ultra low dropout regulator with ex- tremely low quiescent current. High open loop gain assures excellent regulation and ripple rejection performance. The trimmed internal bandgap reference provides precise output voltage over the entire operating temperature range. Dropout voltage is “user selectable” by sizing the external FET: the minimum input-output voltage required for opera- tion is the maximum load current multiplied by the R DS(ON) of the FET. Overcurrent protection of the external FET is easily imple- mented by placing a sense resistor in series with V IN. The 57 mV detection threshold of the current sense circuitry mini- mizes dropout voltage and power dissipation in the resistor. The standard product versions available provide output volt- ages of 12V, 5V, or 3.3V with guaranteed 25˚C accuracy of 1.5% (“A” grade) and 2.5% (standard grade). Features n Simple to use, few external components n Ultra-small mini SO-8 package n 1.5% (A grade) precision output voltage n Low-power shutdown input n < 1 µA in shutdown n Low operating current (180 µA typical @ VIN = 5V) n Wide supply voltage range (1.8V to 24V) n Built-in current limit amplifier n Overtemperature protection n 12V, 5V, and 3.3V standard output voltages n Can be programmed using external divider n −40˚C to +125˚C junction temperature range Applications n High-current 5V to 3.3V regulator n Post regulator for switching converter n Current-limited switch Block Diagram Connection Diagram DS100034-1 *RSET values are: 208k for 12V part, 72.8k for 5V part, and 39.9k for 3.3V part. Surface Mount Mini SO-8 Package DS100034-2 Top View For Order Numbers See Table 1 of this Document See NS Package Number MUA08A September 1997 © 1999 National Semiconductor Corporation DS100034 www.national.com |
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