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MIC94310-MYCS Datasheet(PDF) 9 Page - Micrel Semiconductor |
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MIC94310-MYCS Datasheet(HTML) 9 Page - Micrel Semiconductor |
9 / 15 page Micrel, Inc. MIC94310 Application Information The MIC94310 is a very-high PSRR, fixed-output, 200mA LDO utilizing Ripple Blocker technology. The MIC94310 is fully protected from damage due to fault conditions, offering linear current limiting and thermal shutdown. Input Capacitor The MIC94310 is a high-performance, high-bandwidth device. An input capacitor of 0.47µF is required from the input to ground to provide stability. Low-ESR ceramic capacitors provide optimal performance at a minimum of space. Additional high-frequency capacitors, such as small-valued NPO dielectric-type capacitors, help filter out high-frequency noise and are good practice in any RF-based circuit. X5R or X7R dielectrics are recommended for the input capacitor. Y5V dielectrics lose most of their capacitance over temperature and are therefore, not recommended. Output Capacitance In order to maintain stability, the MIC94310 requires an output capacitor of 0.47µF or greater for the Thin DFN and WLCSP packages and 10µF or greater for the SOT- 23 package. For optimal ripple rejection performance a 1µF capacitor is recommended for the CSP and Thin DFN packages, while a 10µF capacitor is recommended for the SOT-23 package. The design is optimized for use with low-ESR ceramic chip capacitors. High-ESR capacitors are not recommended because they may cause high-frequency oscillation. The output capacitor can be increased, but performance has been optimized for a 1µF ceramic output capacitor and does not improve significantly with larger capacitance. X7R/X5R dielectric type ceramic capacitors are recommended because of their temperature performance. X7R type capacitors change capacitance by 15% over their operating temperature range and are the most stable type of ceramic capacitors. Z5U and Y5V dielectric capacitors change their value by as much as 50% and 60%, respectively, over their operating temperature ranges. To use a ceramic chip capacitor with the Y5V dielectric, the value must be much higher than an X7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. No Load Stability The MIC94310 will remain stable and in regulation with no load. This is especially important in CMOS RAM keep- alive applications. Enable/Shutdown Forcing the enable (EN) pin low disables the MIC94310 and sends it into a “zero” off mode current state. In this state, current consumed by the MIC94310 goes nearly to zero. Forcing EN high enables the output voltage. The EN pin uses CMOS technology and cannot be left floating as it could cause an indeterminate state on the output. Thermal Considerations The MIC94310 is designed to provide 200mA of continuous current in a very-small package. Maximum ambient operating temperature can be calculated based on the output current and the voltage drop across the part. For example if the input voltage is 2.5V, the output voltage is 1.8V, and the output current = 200mA. The actual power dissipation of the Ripple Blocker™ can be determined using Equation 1: PD = (VIN – VOUT1) IOUT + VIN IGND Eq. 1 Because this device is CMOS and the ground current is typically <170µA over the load range, the power dissipation contributed by the ground current is <1% and can be ignored for this calculation. PD = (2.5V – 1.8V) × 200mA PD = 0.14W To determine the maximum ambient operating temperature of the package, use the junction-to-ambient thermal resistance of the device and the Equation 2: − = JA A J(max) D(MAX) θ T T P Eq. 2 TJ(MAX) = 125ºC, the maximum junction temperature of the die, θ JA thermal resistance = 173°C/W for the Thin DFN package. Substituting PD for PD(MAX) and solving for the ambient operating temperature will give the maximum operating conditions for the regulator circuit. September 11, 2014 9 Revision 2.1 |
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