LX824 0 800mA Very High PSRR Low-Dropout Linear Regulator Features Description High PSRR, higher than 48 dB over all frequency up to 100kHz LX8240 is a low-dropout regulator offering the High PSRR, higher than 32 dB over all highest Power Supply Rejection Ratio (PSRR), frequency up to 1MHz higher than 48 dB over all frequency up to 100kHz, +/-2% Accuracy over Temp, Supply and and higher than 32 dB over all frequency up to Load 1MHz for LDO devices supplying 800mA of output current. LX8240 also requires very low quiescent Adjustable Output (0.5V reference) current. It has separate Bias and Input supply rails Over Current Limit to improve efficiency and minimize power Thermal Protection dissipation. The V input includes a voltage BIAS compliance range from 2.7V to 5.5V, and the V IN supply range is 1 .2V to 4.2V. The output voltage is Applications programmed by an external resistor divider utilizing Low Power Mobile Devices the 0.5V reference feedback (FB) pin allowing Portable Devices output voltages as low as 1V. Post Processing for a Switching Regulator LX8240 is an ideal selection for battery-powered systems where the low quiescent current cannot be compromised. It is also guaranteed to be the stable even with only a 1F ceramic capacitor. To protect the device the LX8240 aso includes internal thermal shutdown, and overcurrent limit features. 2 8 5V BIAS OUT 1.5V 500mA C1 1F C4 C2 10nF 10F 1 7 IN LX8240 FB 1.8V C3 1F 4 5 EN GND Figure 1 Typical Application of LX8240 June 2013 Rev. 1.0 www.microsemi.com 1 2013 Microsemi Corporation 800mA Very High PSRR Low-Dropout Linear Regulator Pin Configuration and Pinout 1 8 IN OUT 2 7 BIAS FB 3 6 N/C N/C 4 5 GND EN Figure 2 Pinout WDFN 3mm x 2mm 8L Top View Marking: Line 1 8240 Line 2 Date / Lot Code Line 3 * MSC ( *Pin 1 identifier ) Ordering Information Ambient Type Package Part Number Packaging Type Temperature LX8240ILD Bulk / Tube RoHS Compliant, -40C to 85C WDFN 3mm x 2mm 8L Pb-free LX8240ILD-TR Tape and Reel Pin Description Pin Pin Description Number Designator 1 Power Source Input. Bypass IN to GND with a 1F or greater capacitor. IN 2 BIAS Bias Voltage. Bypass to GND with a 1F capacitor or greater. 3, 6 NC No Connect. 4 GND Ground. Enable Input. Drive EN high to turn on, drive EN low to turn it off. For 5 EN automatic startup, connect EN to Bias. Feedback Input. Connect a resistive voltage divider from OUT to FB to set the 7 FB output voltage. OUT feedback threshold is 0.5V. Regulator Output. OUT is the output of the linear regulator. Bypass OUT to 8 OUT GND with a 1F or greater capacitor. 2