RT9172-25GM Richtek

RT9172 3A Fixed Output Voltage LDO Regulator General Description Features Low Dropout Voltage The RT9172 series of low dropout linear regulators operate Low Ground Pin Current from a 2.25V to 6V input supply. A wide range of preset Load Regulation of 0.4% at 3A output voltage options is available. These low dropout linear 0.5mA Quiescent Current in Shutdown Mode regulators respond very fast to step changes in load, which Guaranteed Output Current of 3A DC are suitable for low voltage microprocessor applications. Available in TO-263 and TO-220 Packages The RT9172 uses an internal P-MOSFET as the pass Output Voltage Accuracy 1.5% device, which does not cause extra GND current in heavy Error Flag Indicates Output Status load and dropout condition. The shutdown mode of low Sense Option Improves Better Load Regulation operation current makes the IC suitable for power-saving Extremely Low Output Capacitor Requirements systems. The other features include current limiting and Over Temperature/Over- Current Protection over temperature protection. RoHS Compliant and 100% Lead (Pb)-Free Ordering Information - RT9172 Applications Microprocessor Power Supplies Package Type T5 : TO-220-5 GTL, GTL+, BTL, and SSTL Bus Terminators M5 : TO-263-5 Power Supplies for DSPs T : TO-220 SCSI Terminator M : TO-263 Post Regulators G : SOT-223 S : SOP-8 High Efficiency Linear Regulators Lead Plating System Battery Chargers P : Pb Free Other Battery Powered Applications G : Green (Halogen Free and Pb Free) Output Voltage Pin Configurations 15 : 1.5V (TOP VIEW) 16 : 1.6V : 32 : 3.2V 33 : 3.3V S : Pin Out Exchange 1 23 N : Pin 5 bond SENSE F : Pin 5 bond FLG Note : TO-220 VIN GND VOUT (TAB) Richtek products are : TO-263 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. VOUT 8 VIN SENSE 2 7 GND 1 23 GND 3 6 GND Marking Information NC 45 EN VIN GND VOUT SOP-8 For marking information, contact our sales representative (TAB) directly or through a Richtek distributor located in your SOT-223 area. DS9172-17 April 2011 www.richtek.com 1 1 23 VIN GND VOUT (TAB)+ + RT9172 5 SENSE/FLG 5 SENSE/FLG 4 4 VOUT VOUT 3 3 GND (TAB) GND (TAB) 2 VIN 2 VIN 1 EN 1 EN TO-220-5 TO-263-5 RT9172N- xT5 RT9172N- xM5 RT9172F- xT5 RT9172F- xM5 5 VOUT 5 VOUT 4 4 SENSE SENSE 3 GND (TAB) 3 GND (TAB) 2 EN 2 EN 1 VIN 1 VIN TO-220-5 TO-263-5 RT9172S- xT5 RT9172S- xM5 Functional Pin Description Pin No. RT9172- xT Pin Name Pin Function RT9172F RT9172N RT9172S RT9172- xM RT9172- xG 1 1 2 -- EN Chip Enable. (Active Hight) 2 2 1 1 VIN Power Input Voltage. 3 3 3 2 GND Ground. 4 4 5 3 VOUT Output Voltage. ERROR Flag. 5 -- -- -- FLG -- 5 4 -- SENSE Remote Sense. Typical Application Circuit RT9172-25 V OUT V = 3.3V VIN VOUT IN 2.5V, 3A C GND IN C OUT 10uF Figure 1 www.richtek.com DS9172-17 April 2011 2