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C3225X5R0J476M Datasheet(PDF) 2 Page - Richtek Technology Corporation |
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C3225X5R0J476M Datasheet(HTML) 2 Page - Richtek Technology Corporation |
2 / 14 page RT8295A 2 DS8295A-03 March 2011 www.richtek.com Functional Pin Description Pin No. Pin Name Pin Function 1 BOOT Bootstrap for high side gate driver. Connect a 0.1 µF or greater ceramic capacitor from BOOT to SW pins. 2 VIN Input Supply Voltage, 4.5V to 23V. Must bypass with a suitably large ceramic capacitor. 3 SW Phase Node. Connect this pin to an external L-C filter. 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. This pin is connected to the converter output. It is used to set the output of the converter to regulate to the desired value via an internal resistive voltage divider. For an adjustable output, an external resistive voltage divider is connected to this pin. 6 COMP Compensation Node. COMP is used to compensate the regulation control loop. Connect a series RC network from COMP to GND. In some cases, an additional capacitor from COMP to GND is required. 7 EN Chip Enable (Active High). A logic high enables the converter; a logic low forces the RT8295A into shutdown mode reducing the supply current to less than 3 µA. Attach this pin to VIN with a 100kΩ pull up resistor for automatic startup. 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 13.5ms. Typical Application Circuit VOUT (V) R1 (k Ω) R2 (k Ω) RC (k Ω) CC (nF) L ( µH) COUT ( µF) 8 27 3 27 3.3 22 22 x 2 5 62 11.8 20 3.3 15 22 x 2 3.3 75 24 13 3.3 10 22 x 2 2.5 25.5 12 9.1 3.3 6.8 22 x 2 1.5 10.5 12 4.7 3.3 3.6 22 x 2 1.2 12 24 3.6 3.3 3.6 22 x 2 1 3 12 3 3.3 2 22 x 2 Table 1. Recommended Component Selection VIN EN GND BOOT FB SW 7 5 2 3 1 L 10 µH 100nF 22 µF x 2 R1 75k R2 24k VOUT 3.3V/2A 10 µF VIN 4.5V to 23V RT8295A SS 8 CSS COMP CC 3.3nF RC 13k CP Open 6 4, 9 (Exposed Pad) CBOOT CIN 0.1 µF COUT REN 100k |
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