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MIC5213-3.0BC5 Datasheet(PDF) 7 Page - Micrel Semiconductor |
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MIC5213-3.0BC5 Datasheet(HTML) 7 Page - Micrel Semiconductor |
7 / 8 page June 2000 7 MIC5213 MIC5213 Micrel Applications Information Input Capacitor A 0.1 µF capacitor should be placed from IN to GND if there is more than 10 inches of wire between the input and the ac filter capacitor or when a battery is used as the input. Output Capacitor Typical PNP based regulators require an output capacitor to prevent oscillation. The MIC5213 is ultrastable, requiring only 0.47 µF of output capacitance for stability. The regulator is stable with all types of capacitors, including the tiny, low-ESR ceramic chip capacitors. The output capacitor value can be increased without limit to improve transient response. No-Load Stability The MIC5213 will remain stable and in regulation with no load (other than the internal voltage divider) unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Enable Input The MIC5213 features nearly zero off-mode current. When EN (enable input) is held below 0.6V, all internal circuitry is powered off. Pulling EN high (over 2.0V) re-enables the device and allows operation. When EN is held low, the regulator typically draws only 10nA of current. While the logic threshold is TTL/CMOS compatible, EN may be pulled as high as 20V, independent of V IN. Thermal Behavior The MIC5213 is designed to provide 80mA of continuous current in a very small profile packages. Maximum power dissipation can be calculated based on the output current and the voltage drop across the part. To determine the maximum power dissipation of the package, use the junction-to-ambi- ent thermal resistance of the device and the following basic equation: P TT D(max) J(max) A JA = − θ T J(max) is the maximum junction temperature of the die, 125 °C, and T A is the maximum ambient temperature. θJA is the junction-to-ambient thermal resistance ambient of the regulator. The θ JA of the MIC5213 is 450°C/W. The actual power dissipation of the regulator circuit can be determined using one simple equation. P D = (VIN – VOUT) IOUT + VIN × IGND Substituting P D(max), determined above, for PD and solving for the operating conditions that are critical to the application will give the maximum operating conditions for the regulator circuit. For example, if we are operating the MIC5213-3.0BC5 at room temperature, with a minimum footprint layout, we can determine the maximum input voltage for a set output current. P 125 25 450 C / W D(max) = − ° P 222mW D(max) = To prevent the device from entering thermal shutdown, maximum power dissipation cannot be exceeded. Using the output voltage of 3.0V, and an output current of 80mA, we can determine the maximum input voltage. Ground current, maxi- mum of 3mA for 80mA of output current, can be taken from the “Electrical Characteristics” section of the data sheet. 222mW = (V IN – 3.0V) 80mA + VIN × 3mA 222mW = (80mA × V IN + 3mA × VIN) – 240mW 462mW = 83mA × V IN V IN = 5.57V max. Therefore, a 3.0V application at 80mA of output current can accept a maximum input voltage of 5.6V in an SC-70-5 package. For a full discussion of heat sinking and thermal effects on voltage regulators, refer to Regulator Thermals section of Micrel’s Designing with Low-Dropout Voltage Regu- lators handbook. Fixed Voltage Regulator The MIC5213 is ideal for general-purpose voltage regulation in any handheld device. Applications that are tight for space can easily use the Teeny™ SC-70 regulator which occupies half the space of a SOT-23-5 regulator. The MIC5203 offers a smaller system solution, only requiring a small multilayer ceramic capacitor for stability. MIC5213-x.x IN OUT GND 0.47µF VOUT 3.0V 3.6V Li-Ion Cell EN Figure 1. Single-Cell Regulator |
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