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GRM32ER71C226M Datasheet(PDF) 2 Page - Richtek Technology Corporation |
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GRM32ER71C226M Datasheet(HTML) 2 Page - Richtek Technology Corporation |
2 / 12 page RT8250 2 DS8250-05 March 2011 www.richtek.com Functional Pin Description Pin No. Pin Name Pin Function 1 BOOT Bootstrap for High Side Gate Driver. Connect a 10nF or greater ceramic capacitor from the BOOT pin to SW pin. 2 VIN Voltage Supply Input. The input voltage range is from 4.5V to 23V. A suitable large capacitor must be bypassed with this pin. 3 SW Switching Node. Connect the output LC filter between the SW pin and output load. 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 Output Voltage Feedback Input. The feedback reference voltage is 0.925V typically. 6 COMP Compensation Node. This pin is used for compensating the regulation control loop. A series RC network is required to be connected from COMP to GND. If it is needed, an additional capacitor should be connected from COMP to GND. 7 EN Enable Input. A logic high enables the converter, a logic low forces the converter into shutdown mode reducing the supply current to less than 3 μA. For automatic startup, connect this pin to VIN with a 100k Ω pull up resistor. 8 SS Soft-Start Control Input. The soft-start period can be set by connecting a capacitor from the SS to GND. A 0.1 μF capacitor sets the soft-start period to 13ms typically. VOUT (V) R1 (k Ω) R2 (k Ω) RC (kΩ) CC (nF) L (μH) COUT (μF) 15 153 10 30 3.9 33 22 x 2 10 97.6 10 20 3.9 22 22 x 2 8 76.8 10 15 3.9 22 22 x 2 5 45.3 10 13 3.9 15 22 x 2 3.3 26.1 10 6.8 3.9 10 22 x 2 2.5 16.9 10 6.2 3.9 6.8 22 x 2 1.8 9.53 10 4.3 3.9 4.7 22 x 2 1.2 3 10 3 3.9 3.6 22 x 2 Table 1. Recommended Component Selection Typical Application Circuit VIN EN GND BOOT FB SW 7 5 2 3 1 L1 10µH 10nF 22µFx2 R1 26.1k R2 10k VOUT 3.3V/3A 10µFx2 VIN 4.75V to 23V RT8250 SS 8 CSS 0.1µF COMP CC 3.9nF RC 6.8k CP NC 6 4, Exposed Pad(9) CBOOT COUT CIN 100k REN |
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