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RC5061 数据表(PDF) 2 Page - Fairchild Semiconductor |
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RC5061 数据表(HTML) 2 Page - Fairchild Semiconductor |
2 / 18 page RC5061 PRODUCT SPECIFICATION 2 REV. 1.0.0 7/6/00 source with minimal external circuitry. Synchronous-mode operation offers optimum efficiency over the entire specified output voltage range. An on-board precision low TC reference achieves tight tolerance voltage regulation without expensive external components, while Active Droop permits exact tailor- ing of voltage for the most demanding load transients. The RC5061 includes linear regulator controllers for Vtt termina- tion (1.5V), and Vclock (2.5V), each adjustable with an exter- nal divider. The RC5061 also offers integrated functions including Power Good, Output Enable/Soft Start and current limiting, and is available in a 20 pin SOIC package. Pin Assignments 20 19 18 17 16 15 14 13 12 11 RC5061 HIDRV SW GNDA VID4 VID3 VID2 VID1 VID0 VTTGATE VTTFB VCCP LODRV GNDP VCCA VFB IFB PWRGD SS/ENABLE VCKFB VCKGATE 1 2 3 4 5 6 7 8 9 10 Pin Definitions Pin Number Pin Name Pin Function Description 1 HIDRV High Side FET Driver. Connect this pin through a resistor to the gate of an N-channel MOSFET. The trace from this pin to the MOSFET gate should be <0.5". 2SW High side Driver Source and Low side Driver Drain Switching Node. Together with IFB pin allows FET sensing for Vcc current. 3 GNDA Analog Ground. Return path for low power analog circuitry. This pin should be connected to a low impedance system ground plane to minimize ground loops. 4-8 VID0-4 Voltage Identification Code Inputs. These open collector/TTL compatible inputs will program the output voltage over the ranges specified in Table 2. Pull-up resistors are internal to the controller. 9 VTTGATE Gate Driver for VTT Transistor. For 1.5V output. 10 VTTFB Voltage Feedback for VTT. 11 VCKGATE Gate Driver for VCK Transistor. For 2.5V output. 12 VCKFB Voltage Feedback for VCK. 13 ENABLE/SS Output Enable. A logic LOW on this pin will disable all outputs. An internal current source allows for open collector control. This pin also doubles as soft start for all outputs. 14 PWRGD Power Good Flag. An open collector output that will be logic LOW if any output voltage is not within ±12% of the nominal output voltage setpoint. 15 IFB Vcc Current Feedback. Pin 15 is used in conjunction with pin 2 as the input for the Vcc current feedback control loop. Layout of these traces is critical to system performance. See Application Information for details. 16 VFB Vcc Voltage Feedback. Pin 16 is used as the input for the Vcc voltage feedback control loop. See Application Information for details regarding correct layout. 17 VCCA Analog VCC. Connect to system 5V supply and decouple with a 0.1µF ceramic capacitor. 18 GNDP Power Ground. Return pin for high currents flowing in pin 20 (VCCP). 19 LODRV Vcc Low Side FET Driver. Connect this pin through a resistor to the gate of an N-channel MOSFET for synchronous operation. The trace from this pin to the MOSFET gate should be <0.5". 20 VCCP Power VCC. For all FET drivers. Connect to system 12V supply through a 33 Ω, and decouple with a 1µF ceramic capacitor. |
类似零件编号 - RC5061 |
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类似说明 - RC5061 |
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