The VOUT pin is the input of the internal VCC regulator and also is the input of the output voltage sensing. To minimize noise at the VOUT pin, a 1-μF capacitor must be placed at the VOUT pin in most cases. If multiple output capacitors are used, one of them can be placed at the VOUT pin as C_VOUT. The VOUT capacitor must be a high-quality, low-ESR, ceramic capacitor and must be placed close to the device. A resistor can be added at the VOUT pin (R_VOUT) to form a RC filter (see Figure 9-3). In this case, the maximum resistor value should be less than or equal to 2 Ω.