RT9164CGG Richtek

RT9164C 1A Fixed and Adjustable Low Dropout Positive Voltage Regulators General Description Features zz z zz Low Dropout Performance, 1.4V Maximal The RT9164C series of high performance positive voltage zz z zz Full Current Rating Over Line and Temperature regulators is designed for applications requiring low dropout zz z zz Fast Transient Response performance at fully rated current. Additionally, the RT9164C zz z zz 1% Output Voltage Accuracy series provides excellent regulation over variations in line zz z zz 2.5V and 3.3V Fixed/Adjustable Output Voltage and load. Outstanding features include low dropout zz z zz SOT-223, TO-252, and TO-263 Packages performance at rated current, fast transient response, zz z zz RoHS Compliant and 100% Lead (Pb)-Free internal current-limiting, and thermal-shutdown protection of the output device. The RT9164C series of three terminal Applications regulators offers fixed and adjustable voltage options z Active SCSI Termination available in space-saving SOT-223, TO-252, and TO-263 z Low Voltage Microcontrollers packages. z Switching Power Supply Post-Regulator Ordering Information Pin ConFigurations RT9164C- (TOP VIEW) Package Type G : SOT-223 L: TO-252 3 VIN LR : TO-252 (R-Type) 2 VOUT (TAB) M : TO-263 Lead Plating System 1 ADJ/GND P : Pb Free G : Green (Halogen Free and Pb Free) SOT-223 Output Voltage Default : Adjustable 3 VIN 25 : 2.5V 33 : 3.3V 2 VOUT (TAB) Note : 1 ADJ/GND Richtek products are : TO-252 RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. 3 VOUT Suitable for use in SnPb or Pb-free soldering processes. 2 ADJ/GND (TAB) Marking Information 1 VIN For marking information, contact our sales representative TO-252 (R-Type) directly or through a Richtek distributor located in your area. 3 VIN 2 VOUT (TAB) ADJ/GND 1 TO-263 DS9164C-03 April 2011 www.richtek.com 1+ + + + RT9164C Typical Application Circuit RT9164C RT9164C-33 VIN VOUT VIN VOUT V = 5V V = 3.45V V = 5V V = 3.3V IN OUT IN OUT R1 ADJ GND V 133 REF C IN 1% C C OUT OUT 10uF I Q C 10uF 10uF IN I ADJ R2 10uF Tantalum Tantalum 232 1% R (1) C needed if device is far from filter capacitors. 2 IN V = V (1+ )+I R OUT REF ADJ 2 R 1 (2) C required for stability. OUT needed if device is far from filter capacitors. (1) C IN (2) C required for stability. OUT Figure 1. Adjustable Voltage Regulator Figure 2. Fixed Voltage Regulator Function Block Diagram VIN S.O.A. Current LIMIT Limiting Amplifier VOUT SENSE Thermal Overload Voltage Regulation Amplifer V ADJ/GND REF Functional Pin Description Pin Name Pin Function ADJ/GND Adjust Output or Ground. VOUT Output Voltage. VIN Power Input. www.richtek.com DS9164C-03 April 2011 2