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RT9199GSP Datasheet(PDF) 4 Page - Richtek Technology Corporation |
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RT9199GSP Datasheet(HTML) 4 Page - Richtek Technology Corporation |
4 / 13 page RT9199 4 DS9199-07 September 2007 www.richtek.com Functional Pin Description VIN Input voltage which supplies current to the output pin. Connect this pin to a well-decoupled supply voltage. To prevent the input rail from dropping during large load transient, a large, low ESR capacitor is recommended to use. The capacitor should be placed as close as possible to the VIN pin. GND (Exposed Pad) Common Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. VCNTL VCNTL supplies the internal control circuitry and provides the drive voltage. The driving capability of output current is proportioned to the VCNTL. Connect this pin to 5V bias supply to handle large output current with at least 1 μF capacitor from this pin to GND. An important note is that VIN should be kept lower or equal to VCNTL. REFEN Reference voltage input and active low shutdown control pin. Two resistors dividing down the VIN voltage on the pin to create the regulated output voltage. Pulling the pin to ground turns off the device by an open-drain, such as 2N7002, signal N-MOSFET. VOUT Regulator output. VOUT is regulated to REFEN voltage that is used to terminate the bus resistors. It is capable of sinking and sourcing current while regulating the output rail. To maintain adequate large signal transient response, typical value of 1000 μF Al electrolytic capacitor with 10μF ceramic capacitors are recommended to reduce the effects of current transients on VOUT. Function Block Diagram GND VCNTL REFEN Current Limit Thermal Protection VOUT EA VIN |
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