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GRM32ER71H475K Datasheet(PDF) 2 Page - Richtek Technology Corporation |
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GRM32ER71H475K Datasheet(HTML) 2 Page - Richtek Technology Corporation |
2 / 13 page RT8289 2 DS8289-01 March 2011 www.richtek.com Functional Pin Description Function Block Diagram Pin No. Pin Name Pin Function 1 BOOT High Side Gate Drive Bootstrap Input. BOOT supplies the drive for the high side N-MOSFET switch. Connect a 10nF or greater capacitor from SW to BOOT to power the high side switch. 2, 3 NC No Internal Connection. 4 FB Feedback Input. FB senses the output voltage to regulate said voltage. Drive FB with a resistive voltage divider from the output voltage. The value of the divider resistors also sets loop bandwidth. The feedback threshold is 1.222V. 5 EN Chip Enable (Active High). EN is a digital input that turns the regulator on or off. Drive EN higher than 1.4V to turn on the regulator, lower than 0.4V to turn it off. For automatic startup, leave EN unconnected. 6, 9 (Exposed Pad) GND Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. 7 VIN Power Input. VIN supplies the power to the IC, as well as the step-down converter switches. Drive VIN with a 5.5V to 32V power source. Bypass VIN to GND with a suitably large capacitor to eliminate noise on the input to the IC. 8 SW Power Switching Output. SW is the switching node that supplies power to the output. Connect the output LC filter from SW to the output load. Note that a capacitor is required from SW to BOOT to power the high side switch. S Q R Driver Bootstrap Control - + Current Sense Amplifier PWM Comparator Oscillator 500kHz Ramp Generator Regulator Reference + - 12k Error Amplifier 30pF 400k 13pF SW BOOT FB EN VIN GND + - OC Limit Clamp |
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