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SP6126 Datasheet(PDF) 3 Page - Sipex Corporation |
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SP6126 Datasheet(HTML) 3 Page - Sipex Corporation |
3 / 14 page Mar 29-07 RevD SP6126: TSOT-6 PFET Buck Controller 2007 Sipex Corporation 3 PIN DESCRIPTION PIN # PIN NAME DESCRIPTION 1 VIN Input power supply for the controller. Place input decoupling capacitor as close as possible to this pin. 2 GATE Connect to the gate terminal of the external P-channel MOSFET. 3 VDR Power supply for the internal driver. This voltage is internally regulated to about 5V below VIN. Place a 0.1uF decoupling capacitor between VDR and VIN as close as possible to the IC. 4 FB Regulator feedback input. Connect to a resistive voltage-divider network to set the output voltage. This pin can be also used for ON/OFF control. If this pin is pulled above 1V the P-channel driver is disabled and controller resets internal soft start circuit. 5 GND Ground pin. 6 LX This pin is used as a current limit input for the internal current limit comparator. Connect to the drain pin of the external MOSFET through an optional resistor. Internal threshold is pre-set to 300mV nominal and can be decreased by changing the external resistor based on the following formula: VTRSHLD = 300mV – 30uA * R BLOCK DIAGRAM FAULT Register Set Dominant POR ENBL 4-Bit counter VDR VIN GATE 5V Internal LDO VIN - 0.3V Overcurrent Comparator LX VDR 30uA GND 5V + - + - VREF FAULT FB Oscillator VIN S R I = k x VIN Error Amplifier PWM Comparator PWM Latch Reset Dominant Vin - 5V LDO FAULT + - 1V FAULT 200ms delay UVLO S R R |
Similar Part No. - SP6126_07 |
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Similar Description - SP6126_07 |
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