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CM1117CM223 Datasheet(PDF) 4 Page - Champion Microelectronic Corp. |
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CM1117CM223 Datasheet(HTML) 4 Page - Champion Microelectronic Corp. |
4 / 7 page CM1117 1A LOW DROPOUT VOLTAGE REGULATOR 2007/05/02 Rev1.9 Champion Microelectronic Corporation Page 4 Note 1: Typical Values represent the most likely parametric norm. Note 2: All limits are guaranteed by testing or statistical analysis. Note 3: Load and line regulation are measured at constant junction room temperature. Note 4: The dropout voltage is the input/output differential at which the circuit ceases to regulate against further reduction in input voltage. It is measured when the output voltage has dropped 100mV from the nominal value obtained at VIN = VOUT +1.5V. Note 5: The minimum output current required to maintain regulation. Note 6: Minimum pad size of 0.038in 2 Application Hints Like any linear voltage regulator, CM1117 requires external capacitors to ensure stability. The external capacitors must be carefully selected to ensure performance. Input Capacitor An input capacitor of at least 10μF is required. Ceramic or Tantalum can be used. The value can be increase without upper limit. Output Capacitor An output capacitor is required for stability. It must be placed no more than 1 cm away from the VOUT pin, and connected directly between VOUT and GND pins. The minimum value is 22μF but may be increase without limit. Thermal Considerations It is important that the thermal limit of the package is not exceeded. The CM1117 has built-in thermal protection. When the thermal limit is exceeded, the IC will enter protection, and VOUT will be pulled to ground. The power dissipation for a given application can be calculated as following: The power dissipation (PD) is PD = IOUT * [VIN – VOUT] |
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