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C3225X5R0J226M Datasheet(PDF) 2 Page - Richtek Technology Corporation |
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C3225X5R0J226M Datasheet(HTML) 2 Page - Richtek Technology Corporation |
2 / 13 page RT8055B 2 DS8055B-03 April 2011 www.richtek.com Functional Pin Description Pin No. Pin Name Pin Function 1 SHDN/RT Shutdown Control or Frequency Setting Input. Connect a resistor to ground from this pin sets the switching frequency. Force this pin to VDD or GND causes the device to be shut down. 2, 11 (Exposed Pad) GND Signal Ground. All small-signal components and compensation components should be connected to this ground, which in turn connects to PGND at one point. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. 3, 4 LX Internal Power MOSFET Switches Output. Connect this pin to the inductor. 5 PGND Power Ground. Connect this pin close to the negative terminal of CIN and COUT. 6 PVDD Power Supply Input. Decouple this pin to PGND with a capacitor. 7 VDD Signal Supply Input. Decouple this pin to GND with a capacitor. Generally, VDD is equal to PVDD. 8 PGOOD Power Good Indicator. The pin is an open drain logic output that is pulled to Ground. 9 FB Feedback Pin. This pin receives the feedback voltage from a resistive divider connected across the output. 10 COMP Error Amplifier Compensation Point. The current comparator threshold increases with this control voltage. Connect external compensation elements to this pin to stabilize the control loop. Typical Application Circuit Note : Using X5R/X7R Ceramic Capacitors Table 1. Recommended Component Selsction VOUT R1 (k Ω) R2 (k Ω) RCOMP (kΩ) CCOMP (nF) L1 ( μH) COUT (μF) 3.3 75 24 30 0.47 2.2 22 x 2 2.5 51 24 27 0.47 2.2 22 x 2 1.8 30 24 22 0.47 2.2 22 x 2 1.5 21 24 18 0.47 2.2 22 x 2 1.2 12 24 15 0.47 1.0 22 x 2 1.0 6 24 13 0.47 1.0 22 x 2 22µF x 2 PVDD LX SHDN/RT RT8055B VDD COMP 2µH VOUT1 L1 10 3, 4 COUT GND FB PGND 9 R1 R2 75k 24k 3.3V/3A RCOMP 30k CCOMP 470pF 22pF CF R3 C1 R4 100k 6 7 PGOOD CIN 22µF VIN 5V PGOOD 8 1 ROSC 180k 2,11 (Exposed Pad) 5 |
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