RT9164A 1A Fixed and Adjustable Low Dropout Positive Voltage Regulators General Description Features The RT9164A series of high performance positive voltage zz z zz Low Dropout Performance, 1.4V Max regulators is designed for applications requiring low dropout zz z zz Full Current Rating Over Line and Temperature performance at fully rated current. Additionally, the RT9164A zz z zz Fast Transient Response series provides excellent regulation over variations in line zz z zz 2% Output Voltage Accuracy and load. Outstanding features include low dropout zz z zz 1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, and 3.5V Fixed performance at rated current, fast transient response, Adjustable Output Voltage internal current-limiting, and thermal-shutdown protection zz z zz SOT-223, TO-252, and TO-263 Packages of the output device. The RT9164A series of three terminal zz z zz RoHS Compliant and 100% Lead (Pb)-Free regulators offers fixed and adjustable voltage options available in space-saving SOT-223, TO-252, and TO-263 Applications packages. z Active SCSI Termination z Low Voltage Microcontrollers Ordering Information z Switching Power Supply Post-Regulator RT9164A- Package Type G : SOT-223 Pin ConFigurations L: TO-252 (TOP VIEW) LR : TO-252 (R-Type) M : TO-263 3 VIN Lead Plating System P : Pb Free VOUT (TAB) 2 G : Green (Halogen Free and Pb Free) 1 ADJ/GND Output Voltage Default : Adjustable SOT-223 15 : 1.5V 18 : 1.8V 3 VIN 25 : 2.5V 28 : 2.85V 2 VOUT (TAB) 30 : 3.0V 1 ADJ/GND 33 : 3.3V 35 : 3.5V TO-252 Note : Richtek products are : 3 VOUT RoHS compliant and compatible with the current require- 2 ADJ/GND (TAB) ments of IPC/JEDEC J-STD-020. 1 VIN Suitable for use in SnPb or Pb-free soldering processes. TO-252 (R-Type) Marking Information For marking information, contact our sales representative 3 VIN directly or through a Richtek distributor located in your 2 VOUT (TAB) area. ADJ/GND 1 TO-263 DS9164A-15 April 2011 www.richtek.com 1+ + + + + + RT9164A Typical Application Circuit RT9164A VIN VOUT V = 3.45V V = 5V OUT IN R1 ADJ V 133 REF C 1% IN C OUT 10uF 10uF I ADJ R2 Tantalum 232 1% R 2 V = V (1+ )+I R OUT REF ADJ 2 R 1 (1) C needed if device is far from filter capacitors. IN (2) C required for stability. OUT Figure 1. Adjustable Voltage Regulator RT9164A-33 V OUT VIN VOUT V = 5V IN 3.3V GND C IN C OUT 10uF I 10uF Q Tantalum (1) C needed if device is far from filter capacitors. IN (2) C required for stability. OUT Figure 2. Fixed Voltage Regulator RT9164A-28 18 - 27 Lines VIN VOUT V = 5V IN GND C C OUT IN 10uF 22uF I Q Figure 3. Active SCSI Bus Terminator www.richtek.com DS9164A-15 April 2011 2