RT9020 500mA, Low Dropout, Low Noise Ultra-Fast With Soft Start CMOS LDO Regulator General Description Features Wide Operating Voltage Ranges : 2.2V to 5.5V The RT9020 is a high-performance, 500mA LDO regulator, Low Dropout : 250mV at 500mA offering extremely high PSRR and ultra-low dropout, ideal 5mA Discharge Current of V when IC Shutdown for portable RF and wireless applications with demanding OUT Ultra-Low-Noise for DSC Application performance and space requirements. Ultra-Fast Response in Line/Load Transient The RT9020 quiescent current is as low as 25A, further Current Limiting Protection prolonging the battery life. The RT9020 also works with Thermal Shutdown Protection low-ESR ceramic capacitors, reducing the amount of board High Power Supply Rejection Ratio space necessary for power applications, critical in hand- Output Only 1F Capacitor Required for Stability held wireless devices. TTL-Logic-Controlled Shutdown Input The RT9020 consumes typical 0.7A in shutdown mode RoHS Compliant and 100% Lead (Pb)-Free and has fast turn-on time less than 70s (without C ). SS The other features include ultra-low dropout voltage, high Applications output accuracy, current limiting protection, and high ripple Digital Still Camera rejection ratio. Tiny packages SOT-23-5 and SC-70-5 are CDMA/GSM Cellular Handsets available. Portable Information Appliances Laptop, Palmtops, Notebook Computers Ordering Information Mini PCI & PCI-Express Cards - RT9020 PCMCIA & New Cards Package Type B : SOT-23-5 Marking Information U5 : SC-70-5 Lead Plating System For marking information, contact our sales representative P : Pb Free directly or through a Richtek distributor located in your G : Green (Halogen Free and Pb Free) area. Fixed Output Voltage 15 : 1.5V Pin Configurations 16 : 1.6V : TOP VIEW 32 : 3.2V VOUT SS 33 : 3.3V 1B : 1.25V 5 4 1H : 1.85V 23 2H : 2.85V VIN GND EN Note : Richtek products are : SOT-23-5 / SC-70-5 RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. DS9020-04 April 2011 www.richtek.com 1RT9020 Typical Application Circuit VIN VOUT V V IN OUT C C OUT IN 1uF/ 1uF/ RT9020 X7R X7R Chip Enable EN SS C SS GND 0.5nF Functional Pin Description Pin Number Pin Name Pin Function 1 VIN Supply Input. 2 GND Common Ground. Enable Input Logic, Active High. When the EN goes to a logic low, the device will 3 EN be shutdown. 4 SS Soft Start. 5 VOUT Regulator Output. Function Block Diagram SS POR Current OTP Limit EN VIN R V REF - MOS + Driver VOUT GND www.richtek.com DS9020-04 April 2011 2