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MIC5205-2.5BM5 Datasheet(PDF) 9 Page - Micrel Semiconductor |
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MIC5205-2.5BM5 Datasheet(HTML) 9 Page - Micrel Semiconductor |
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9 / 10 page  Micrel MIC5205 February 2006 9 M9999-020806 (408) 955-1690 VIN(max) = 6.23V Therefore, a 3.3V application at 150mA of output current can accept a maximum input voltage of 6.2V in a SOT- 23-5 package. For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the Regulator Thermals section of Micrel’s Designing with Low-Dropout Voltage Regulators handbook. Fixed Regulator Applications Figure 1. Ultra-Low-Noise Fixed Voltage Application Figure 1 includes a 470pF capacitor for low-noise operation and shows EN (pin 3) connected to IN (pin 1) for an application where enable/shutdown is not required. COUT = 2.2µF minimum. Figure 2. Low-Noise Fixed Voltage Application Figure 2 is an example of a low-noise configuration where CBYP is not required. COUT = 1µF minimum. Adjustable Regulator Applications The MIC5205BM5 can be adjusted to a specific output voltage by using two external resistors (Figure 3). The resistors set the output voltage based on the following equation: ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + × = 1 R1 R2 1.242V VOUT This equation is correct due to the configuration of the bandgap reference. The bandgap voltage is relative to the output, as seen in the block diagram. Traditional regulators normally have the reference voltage relative to ground and have a different VOUT equation. Resistor values are not critical because ADJ (adjust) has a high input impedance, but for best results use resistors of 470kΩ or less. A capacitor from ADJ to ground provides greatly improved noise performance. Figure 3. Ultra-Low-Noise Adjustable Voltage Application Figure 3 includes the optional 470pF noise bypass capacitor from ADJ to GND to reduce output noise. Dual-Supply Operation When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to ground. |
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