LP3994 Datasheet | National Semiconductor

Description The LP3994 regulator provides 1.5V and 1.8V outputs options at up to 50m A load current. The LP3994 provides an accurate output voltage with low quiescent current at full current. Good noise performance is obtained without a noise bypass capacitor. The low quiescent current in operation can be reduced to virtually zero when the device is disabled via a logic signal to the enable input. In conjuction with small space saving capacitors, the small package size of the micro SMD devices results in a regulator solution with a very small footprint for any given application. The LP3994 is suitable for general use within the range of portable, battery-powered equipment and voltage options other than 1.5V and 1.8V can be made available. The LP3994 also features short-circuit and thermalshutdown protection. Performance is specified for a -40˚C to 125˚C temperature range. This device is available with output voltages of 1.5V and 1.8V in both micro SMD and LLP packages. Other voltages and alternative packages may be made available, please contact your local NSC sales office. Key Specifications n n n n n n n n Input Voltage Range Output Voltage Range Output Current Noise Figure PSRR Fast Startup Output Capacitor Virtually Zero IQ(Disabled) 2.5 to 5.5V 1.5 to 3.3V 50m A 95µVRMS 70d B 10µs 1µF Low ESR 0.001µA Package Tiny 4 Pin micro SMD 6 pin LLP 1mm by 1mm by 0.6m SOT23 footprint Applications n Bluetooth Devices n Battery Powered Devices n Portable Information Appliances Features n n n n n n 4 Pin Micro SMD Package/ 6 Pin LLP No Noise Bypass Capacitor Required Logic Controlled Enable Stable with Low ESR Ceramic Capacitors Fast turn on time Thermal-Overload and Short Circuit Protection Typical Application Circuit © 2004 National Semiconductor Corporation DS200465 .national. Pin Descriptions Packages micro SMD-4 and LLP-6 Pin No micro SMD A1 B1 B2 A2 Symbol Pin No LLP 5 2 1 6 3 4 pad VEN GND VOUT VIN Name and Function .. Enable Input; Enables the...