LP2975 Datasheet | National Semiconductor

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 extremely 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 operation is the maximum load current multiplied by the RDS(ON) of the FET. Overcurrent protection of the external FET is easily implemented by placing a sense resistor in series with VIN. The 57 m V detection threshold of the current sense circuitry minimizes dropout voltage and power dissipation in the resistor. The standard product versions available provide output voltages of 12V, 5V, or 3.3V with guaranteed 25˚C accuracy of 1.5% (“A” grade) and 2.5% (standard grade). Features n n n n n n n n n n n n Simple to use, few external ponents Ultra-small mini SO-8 package 1.5% (A grade) precision output voltage Low-power shutdown input < 1 µA in shutdown Low operating current (180 µA typical @ VIN = 5V) Wide supply voltage range (1.8V to 24V) Built-in current limit amplifier Overtemperature protection 12V, 5V, and 3.3V standard output voltages Can be programmed using external divider - 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 Surface Mount Mini SO-8 Package DS100034-2 Top View For Order Numbers See Table 1 of this Document See NS Package Number MUA08A DS100034-1 - RSET values are: 208k for 12V part, 72.8k for 5V part, and 39.9k for 3.3V part. © 1999 National Semiconductor Corporation DS100034 .national. Ordering Information TABLE 1. Package Marking and Ordering Information Output Voltage 12 12 12 12...