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SP6213EC5-2.5 Datasheet(PDF) 4 Page - Sipex Corporation |
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SP6213EC5-2.5 Datasheet(HTML) 4 Page - Sipex Corporation |
4 / 10 page 4 Date: 08/10/05 SP6213, SP6214 Micropower, SC-70, 100mA CMOS LDO Regulator © Copyright 2005 Sipex Corporation General Overview Enable/Shutdown Operation The SP6213/4 is turned off by pulling the EN pin low and turned on by pulling it high. If this enable/shutdown feature is not required, EN should be tied to VIN to keep the regulator output on at all times. Input Capacitor Any good quality ceramic or tantalum capaci- tor may be used at the input. A small capacitor of about 1µF is required from VIN to GND if, for instance, a battery is used as the input. Output Capacitor An output capacitor is required between VOUT and GND to prevent oscillation. The minimum size of the output capacitor is a 0.47 µF ceramic. The given datasheet values relate to an IC with a ceramic output capacitor of 1µF. Larger values make the IC more stable which means an improvement of the regulator’s transient response. For a lower output cur- rent, the output capacitance can be chosen smaller in order to have the same output stability. No Load Stability The SP6213/4 will remain stable and in regu- lation with no external load (other than the internal voltage driver) unlike many other volt- age regulators. This is especially important in CMOS RAM keep-alive applications. Thermal Considerations The SP6213/4 is designed to provide 100 mA of continuous current in a very tiny package. Maximum power dissipation can be calcu- lated based on the output current and the voltage drop across the part. To determine the maximum power dissipation of the pack- age, use the junction-to-ambient thermal re- sistance of the device and the following basic equation: PD = (TJ(max) - TA) / θJA TJ(max) is the maximum junction temperature of the die and is 125°C. TA is the ambient operating temperature. θJA is the junction-to- ambient thermal resistance for the regulator and is layout dependent. The actual power dissipation of the regulator circuit can be determined using one simple equation: PD = (VIN - VOUT)*IOUT + VIN*IGND Substituting PD(max) 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 ex- ample, if we are operating the SP6213/4 at 3.0V output at room temperature, with a mini- mum footprint layout, we can determine the maximum input voltage for a set output cur- rent: PD(max) = [(125°C -25°C) / (330°C/W)] = 303 mW. To prevent the device from entering thermal shutdown, maximum power dissipation can not be exceeded. Using the output voltage of 3.0V and an output current of 100 mA, the maximum input voltage can be determined. Ground pin current can be taken from the electrical specifications table (0.135 mA at 100 mA). The maximum input voltage is de- termined as follows: 303mW = (VIN – 3.0V)*100mA + VIN*0.135mA After calculations, we find that the maximum input voltage of a 3.0V application at 100mA of output current in an SC-70-5 package is 6.02V. THEORY OF OPERATION |
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