RT9017 500mA Peak, Thermal Folded Back CMOS LDO Regulator General Description Features zz z zz Short Circuit Thermal Folded Back Protection The RT9017 is designed for portable RF and wireless zz z zz Low-Noise for RF Application applications with demanding performance and space zz z zz Fast Response in Line/Load Transient requirements. The RT9017 performance is optimized for zz z zz Quick Start-Up (Typically 50s) battery-powered systems to deliver ultra low noise and zz z zz 0.01A Standby Current When Shutdown low quiescent current. Regulator ground current increases zz z zz Low Dropout : 380mV 500mA only slightly in dropout, further prolonging the battery life. zz z zz Wide Operating Voltage Ranges : 2.5V to 5.5V The RT9017 also works with low-ESR ceramic capacitors, zz z zz TTL-Logic-Controlled Shutdown Input reducing the amount of board space necessary for power zz z zz Low Temperature Coefficient applications, critical in hand-held wireless devices. The zz z zz Current Limiting Protection RT9017 consumes less than 0.01A in shutdown mode zz z zz Thermal Shutdown Protection and has fast turn-on time less than 50s. RT9017 is short zz z zz Only 1F Output Capacitor Required for Stability circuit thermal folded back protected. RT9017 lowers its zz z zz High Power Supply Rejection Ratio OTP trip point from 165C to 110C when output short zz z zz Custom Voltage Available circuit occurs (V < 0.4V) providing maximum safety to OUT zz z zz RoHS Compliant and 100% Lead (Pb)-Free end users. The other features include ultra low dropout voltage, high output accuracy, current limiting protection, Applications and high ripple rejection ratio. Available in the SOT-23-3, SOT-23-5 and WDFN-6L 2x2 packages, the RT9017 also z CDMA/GSM Cellular Handsets offers a range of 1.5V to 3.5V with 0.1V per step. z Battery-Powered Equipment z Laptop, Palmtops, Notebook Computers Ordering Information z Hand-Held Instruments RT9017- z PCMCIA Cards Package Type z Portable Information Appliances V : SOT-23-3 B : SOT- 23-5 Marking Information BR : SOT- 23-5 (R-Type) QW : WDFN-6L 2x2 (W-Type) For marking information, contact our sales representative Lead Plating System directly or through a Richtek distributor located in your P : Pb Free area. G : Green (Halogen Free and Pb Free) Output Voltage Pin Configurations 15 : 1.5V (TOP VIEW) 16 : 1.6V : EN 1 6 NC 2 5 34 : 3.4V GND NC 7 3 4 VIN VOUT 35 : 3.5V 1H : 1.85V WDFN-6L 2x2 2H : 2.85V Note : VIN Richtek products are : RoHS compliant and compatible with the current require- 3 ments of IPC/JEDEC J-STD-020. 2 Suitable for use in SnPb or Pb-free soldering processes. GND VOUT SOT-23-3 DS9017-05 April 2011 www.richtek.com 1+ RT9017 VIN VOUT VOUT NC 54 54 23 23 EN NC GND VIN GND EN SOT-23-5 SOT-23-5 (R-Type) Typical Application Circuit RT9017 VIN VOUT V V OUT IN C C IN OUT 1uF 1uF Chip Enable EN GND Functional Pin Description Pin Name Pin Function Chip Enable (Active High). Note that this pin is high impedance. There should be a pull low 100k EN resistor connected to GND when the control signal is floating. NC No Internal Connection. GND Ground. VOUT Output Voltage. VIN Input Voltage. Function Block Diagram EN Shutdown VIN and Logic Control V REF - MOS Driver Error VOUT Amplifier Current-Limit and Thermal Protection GND www.richtek.com DS9017-05 April 2011 2