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RT8265 Datasheet(PDF) 2 Page - Richtek Technology Corporation |
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RT8265 Datasheet(HTML) 2 Page - Richtek Technology Corporation |
2 / 13 page RT8265 2 DS8265-02 March 2011 www.richtek.com Functional Pin Description Pin No. Pin Name Pin Function 1 BOOT High Side Gate Drive Boost Input. BOOT supplies the drive for the high side N-MOSFET switch. Connect a 10nF or greater capacitor from SW to BS to power the high side switch. 2 VIN Power Input. VIN supplies the power to the IC, as well as the step-down converter switches. Bypass VIN to GND with a suitable large capacitor to eliminate noise on the input to the IC. 3 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 BS to power the high side switch. 4, 9 (Exposed Pad) GND Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. 5 FB Feedback Input. FB senses the output voltage to regulate said voltage. The feedback reference voltage is 0.8V typically. 6 COMP Compensation Node. COMP is used to compensate the regulation control loop. Connect a series RC network from COMP to GND to compensate the regulation control loop. In some cases, an additional capacitor from COMP to GND is required. 7 EN Enable Input. 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. If the EN pin is open, it will be pulled to high by internal circuit. 8 SS Soft-Start Control Input. SS controls the soft start period. Connect a capacitor from SS to GND to set the soft-start period. A 0.1 μF capacitor sets the soft-start period to 10ms. VOUT R1 (k Ω) R2(k Ω) RC (kΩ) CC (nF) Cp (pF) L1 ( μH) 15V 280 16 360 0.1 Open 4.7 10V 180 16 240 0.15 Open 4.7 8V 150 16 200 0.22 Open 4.7 5V 84.5 16 140 0.35 Open 4.7 3.3V 49.9 16 82 0.56 Open 4.7 2.5V 33 16 68 0.68 Open 4.7 1.8V 20 16 49.9 1 Open 4.7 1.2V 8.06 16 24 1.5 33 4.7 1.1V 6.04 16 24 1.5 33 4.7 Table 1. Recommended Component Selection |
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