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MIC5202-5.0BM Datasheet(PDF) 6 Page - Micrel Semiconductor |
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MIC5202-5.0BM Datasheet(HTML) 6 Page - Micrel Semiconductor |
6 / 7 page MIC5202 Micrel MIC5202 6 March 2006 Thermal Considerations Applications Information External Capacitors A1µF capacitor is recommended between the MIC5202 output and ground to prevent oscillations due to instability. Larger val- ues serve to improve the regulator’s transient response. Most types of tantalum or aluminum electrolytics will be adequate; film types will work, but are costly and therefore not recom- mended. Many aluminum electrolytics have electrolytes that freeze at about –30°C, so solid tantalums are recommended for operation below –25°C. The important parameters of the capacitor are an effective series resistance of about 5Ω or less and a resonant frequency above 500kHz. The value of this capacitor may be increased without limit. At lower values of output current, less output capacitance is required for output stability. The capacitor can be reduced to 0.47µF for current below 10mA or 0.33µF for currents below 1 mA. A 1µF capacitor should be placed from the MIC5202 input to ground if there is more than 10 inches of wire be- tween the input and the AC filter capacitor or if a battery is used as the supply. ENABLE Input The MIC5202 features nearly zero OFF mode current. When the ENABLE input is held below 0.7V, all internal circuitry is powered off. Pulling this pin high (over 2.0V) re-enables the device and allows operation. The ENABLE pin requires a small amount of current, typically 15µA. While the logic threshold is TTL/CMOS compatible, ENABLE may be pulled as high as 30V, independent of the voltage on V IN. The two portions of the MIC5202 may be enabled separately. General Notes The MIC5202 will remain stable and in regulation with no load in addition to the internal voltage divider, unlike many other voltage regulators. This is especially important in CMOS RAM keep-alive applications. Thermal shutdown is independant on both halfs of the dual MIC5202, however an over-temperature condition on one half might affect the other because of proximity. 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. Both MIC5202 GROUND pins must be tied to the same ground potential. Isolation between the two halfs allows connecting the two V IN pins to different supplies. PC Board θ JA Dielectric FR4 160°C/W Ceramic 120°C/W Multi-layer boards having a ground plane, wide traces near the pads, and large supply bus lines provide better thermal conductivity. The “worst case” value of 160°C/W assumes no ground plane, minimum trace widths, and a FR4 material board. Part II. Nominal Power Dissipation and Die Tempera- ture The MIC5202-xxBM at a 25°C ambient temperature will oper- ate reliably at up to 625mW power dissipation when mounted in the “worst case” manner described above. At an ambient temperature of 55°C, the device may safely dissipate 440mW. These power levels are equivalent to a die temperature of 125°C, the recommended maximum temperature for non- military grade silicon integrated circuits. Part I. Layout The MIC5202-xxBM (8-pin surface mount package) has the following thermal characteristics when mounted on a single layer copper-clad printed circuit board. 245 mil 30 mil 50 mil 50 mil 150 mil Minimum recommended board pad size, SO-8. |
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