L4987 Datasheet | STMicroelectronics

® L4987 SERIES VERY LOW DROP VOLTAGE REGULATORS WITH INHIBIT AND DROPOUT CONTROL FLAG s s s s s s s s s s VERY LOW DROPOUT VOLTAGE (0.25V TYP.) DROPOUT CONTROL FLAG VERY LOW QUIESCENT CURRENT (TYP. 90 µA IN OFF MODE, 500µA IN ON MODE) OUTPUT CURRENT UP TO 200 m A LOGIC-CONTROLLED ELECTRONIC SHUTDOWN OUTPUT VOLTAGES OF 3V, 5V 8.7V 12V INTERNAL CURRENT AND THERMAL LIMIT ONLY 2.2µF FOR STABILITY AVAILABLEIN ± 2% SELECTION AT 25 o C SUPPLY VOLTAGE REJECTION: 70 d B (TYP.) PPAK DESCRIPTION The L4987 is a very low drop regulator available in PPAK. The very low drop-voltage (0.5V Max at 200 m A) and the very low quiescent current make it particularly suitable for low noise, low power applications, and in battey powered systems. The input dump protection up to 40V makes it ideal for automotive applications. a shutdown Logic Control function is available (pin2, TTL patible). This means that when the device is used as a local regulator, it is possible to put a SCHEMATIC DIAGRAM part of the boad in standby, decreasing the total power consumption. The regulator employs an output pin (open collector) providing a logic signal when the pass transistor is in saturation at low input voltage, this signal can be used to prevent the pop-up phenomenon in the car radio. In battery powered systems (the cellular phone, notebook) it is possible to use the flag to monitor the battery charge status through the dropout of the regulator. October 1998 1/11 L4987...