EUP7981 Datasheet | Eutech Microelectronics

DESCRIPTION The EUP7981 is an efficient, CMOS voltage regulator optimized for ultra-low-noise applications. It offers high output accuracy, extremely low dropout voltage low ground current and fast start-up time. The EUP7981 provides a very low noise output, ideal for RF applications where a clean voltage source is required. A noise bypass pin is also available for further reduction of output noise. Designed specifically for handheld and batterypowered devices, the EUP7981 provides a TTL-logic-patible enable pin. When disabled, .. power consumption drops nearly to zero. The EUP7981 also works with low-ESR ceramic capacitors, reducing the amount of board space necessary for power applications, critical in handheld wireless devices. Available in the SC-70 package, the EUP7981 offers a wide range of output voltages. Key features include current limit, thermal shutdown and faster transient response. FEATURES z z z z z z z z z z z z Space-Saving 5-pin SC-70 Package 2.5V to 5.5V Input Voltage Range 50µV(rms) Output Noise 140m V Dropout @ 150m A 75d B PSRR at 1k Hz Low 70µA Ground Current 150m A Output Current Stability with 1µF Ceramic Output Capacitors Excellent Load/Line Transient Thermal Shutdown and Current Limit Protection Available in 1.5V,1.8V,1.85V,2.5V,2.8V,2.85V, 3.0V ,3.3V and Adjustable Voltages Ro HS pliant and 100% Lead (Pb)-Free APPLICATIONS z z z z Cellular Phones Bluetooth Portable Radios and Accessories PDA and Palmtop puters Consumer/Personal Electronics Block Diagram Figure 1. DS7981 Ver1.0 Jan. 2008 Typical Application Circuit .. Figure 2. Pin Configurations Package Type Pin Configurations SC-70 Pin Description PIN VIN GND VEN BYPASS ADJ VOUT PIN 1 2 3 4 5 Input voltage of the LDO mon ground Enable input logic, enable high Optional bypass capacitor for noise reduction Adjustable regulator feedback input. Connect to resistor divider. Output voltage of the LDO DESCRIPTION DS7981 Ver1.0 Jan. 2008 Ordering Information Orde...