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FAN5235 데이터시트(PDF) 2 Page - Fairchild Semiconductor |
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FAN5235 데이터시트(HTML) 2 Page - Fairchild Semiconductor |
2 / 15 page FAN5235 2 REV. 1.3.3 1/3/02 Pin Assignments Pin Description Pin Name Pin Number Pin Function Description VIN 1 Input power. 3.3V-ALWAYS 2 3.3V Always on linear regulator. Load current on pins 2 and 6 must not exceed 50mA total. CPUMP3.3 3 Charge Pump 3.3V. High side Gate drive voltage for 3.3V. This pin is to be connected to SW3.3 through a 100nF cap. and to 5V-ALWAYS through a diode HSD3.3 4 High-side gate driver for 3.3V. Connect this pin directly to the gate of an N-channel MOSFET. The trace from this pin to the MOSFET gate should be < 1". SW3.3 5 High side FET Source and Low Side FET Drain Switching Node. Switching node for 3.3V. 5V-ALWAYS 6 5V Always on linear regulator output. The sum of the load currents on pins 2 and 6 must not exceed 50mA total. LSD3.3 7 Low-side gate driver for 3.3V. Connect this pin directly to the gate of an N-channel MOSFET. The trace from this pin to the MOSFET gate should be < 1". GND3.3 8 Ground for 3.3V MOSFET. ISEN3.3 9 Current sense for 3.3V. This pin should be connected to the Drain of the bottom Mosfet with an appropriate resistor and an RC filter. See Application Section. VFB3.3 10 Voltage feedback for 3.3V. SDN3.3 11 Soft Start and ON/OFF for 3.3V. OFF=GND. ON=open with SDWN=High. Use open collector device for control. PGOOD 12 Power Good Flag. An open collector output that will be logic low if any output voltage is not above 89% of the nominal output voltage. SDWN 13 Master Shutdown. Shutdown for all power. Off when low. When high 5V/3.3V-ALWAYS are ON while 5V/3.3V-Main are ready to turn on if SDN5, SDN3.3 go open. SGND 14 Signal ground. VFB12 15 Voltage feedback for 12V. SW12 16 FET driver for 12V Boost. SDN5 17 Enable/Soft Start for 5V and 12V. Soft start and ON/OFF for 5V & 12V. OFF=Grounded. ON=open with SDWN=High. VFB5 18 Voltage feedback for 5V. GND5 19 Ground for 5V MOSFET. LSD5 20 Low side FET driver for 5V. Connect this pin directly to the gate of an N-channel MOSFET. The trace from this pin to the MOSFET gate should be < 1". 1 Top View 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VIN 3.3V-ALWAYS 5V-ALWAYS CPUMP3.3 HSD3.3 SW3.3 ISEN3.3 LSD3.3 GND3.3 VFB3.3 SDN3.3 PGOOD CPUMP5 HSD5 SW5 ISEN5 LSD5 GND5 VFB5 SDN5 SW12 VFB12 SGND SDWN |
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