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MIC5283 Datasheet(PDF) 9 Page - Micrel Semiconductor |
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MIC5283 Datasheet(HTML) 9 Page - Micrel Semiconductor |
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9 / 19 page  Micrel, Inc. MIC5283 March 2012 9 M9999-030812-A Detailed Description The MIC5283 voltage regulator accepts a 6V to 120V input voltage and has an ultra-low 8µA typical quiescent current while offering an excellent line transient response and PSRR. These features make it ideal for harsh, noisy environments. All options offer 150mA of output current. The MIC5283YML and MIC5283YME offer an adjustable output voltage from 1.22V to 5.5V. The MIC5283-3.3YML and MIC5283-3.3YME offer fixed 3.3V outputs and the MIC5283-5.0YML and MIC5283-5.0YME offer fixed 5.0V outputs. The YME packaged devices feature a heat slug to more effectively remove heat from the die. Applications Information Thermal Protection The MIC5283 has internal thermal shutdown to protect it from excessive heating of the die. When the junction temperature exceeds approximately +155°C, the output is disabled and the device begins to cool down. The device turns back on when the junction temperature cools by 15°C. This will result in a cycled output during continuous thermal-overload conditions. Current Limit The MIC5283 features output current-limit protection. The output sustains a continuous short circuit to GND without damage to the device, but thermal shutdown often results. The typical value for the current limit of the MIC5283 is 300mA. Input Capacitor Connect a 1.0µF capacitor from VIN to GND. Micrel recommends the C5750X7R2E105M, 1.0µF, 250V capacitor made by TDK. When using a different capacitor, assure that the voltage rating of the capacitor has adequate headroom to withstand any potential transient. CPSRR Capacitor To maintain high power supply rejection, connect a 0.1µF capacitor from CPSRR to GND. The voltage rating of the capacitor must be at least 14V. Output Capacitor Connect a 10µF capacitor from VOUT to GND. Assure that the voltage rating of the capacitor exceeds the designed output voltage of the MIC5283. Output Voltage Setting For the MIC5283YML and MIC5283YME, VOUT is programmable from 1.22V to 5.5V using an external resistive divider. VOUT is set using the following equation: 1 R2 R1 V V REF OUT where VREF = 1.22V, and R1 and R2 form the feedback voltage divider from VOUT to ground. Thermal Measurements It is always prudent to measure an IC’s case temperature to make sure that it is within operating limits, but it is easy to get erroneous results. The standard thermocouple that comes with many voltage meters uses a large wire gauge that behaves like a heat-sink, resulting in artificially low case temperature measurements. Use a thermocouple of 36-gauge wire or smaller, such as the Omega (5SC-TT-K- 36-36), to minimize the heat-sinking effect. Also, apply a thermal compound to maximize heat transfer between the IC and the thermocouple. An infrared thermometer is a recommended alternative. The IR thermometer from Optris has a 1mm spot size, ideal for monitoring small surface mount packages. Also, the optional stand makes it easy to keep the beam on the IC for long periods of time. |
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