 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
MIC5232-3.3YD5 Datasheet(PDF) 8 Page - Micrel Semiconductor |
|
||||||||||||||||||||||||||||||
MIC5232-3.3YD5 Datasheet(HTML) 8 Page - Micrel Semiconductor |
|
|
8 / 10 page  Micrel, Inc. MIC5232 September 2008 8 M9999-090508- Application Information Input Capacitor If there is more than 20cm of wire between IN and the ac filter capacitor or if supplied from a battery, a 1µF (or larger) capacitor should be placed from the IN (supply input) to GND (ground). Output Capacitors The MIC5232 requires an output capacitor for stability. A 0.47µF, or larger capacitor, is recommended between OUT (output) and GND to improve the regulator’s transient response. A 0.47µF capacitor can be used to reduce overshoot recovery time at the expense of overshoot amplitude. The ESR (effective series resistance) of this capacitor has no effect on regulator stability, but low-ESR capacitors improve the high frequency transient response. The value of this capacitor may be increased without limit, but values larger than 10µF tend to increase the settling time after a step change in input voltage or output current. C Minimum Load Current The MIC5232 does not require a minimum load for proper operation. This allows the device to operate in applications where very light output currents are required for keep-alive purposes. This is important for powering SRAM or Flash memory in low-power modes for handheld devices. Safe Operating Conditions The MIC5232 incorporates current limit in the design. There is also reverse circuit protection circuitry built into the device. The maximum junction temperature for the device is +125 °C, and it is important that this is not exceeded for any length of time. Thermal Considerations The MIC5232 is designed to provide 10mA 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. Given that the input voltage is 4.3V, the output voltage is 3.3V and the output current = 10mA. The actual power dissipation of the regulator circuit can be determined using the equation: PD = (VIN – VOUT) IOUT + VIN IGND Because this device is CMOS and the ground current is typically <15μA over the load range, the power dissipation contributed by the ground current is < 1% and can be ignored for this calculation. PD = (4.3V – 3.3V) • 10mA PD = 0.01W To determine the maximum ambient operating temperature of the package, use the junction-to- ambient thermal resistance of the device and the following basic equation: JA A J D T T P θ − = (max) (max) TJ(max) = 125°C, the max. junction temperature of the die, θJA thermal resistance = 90 °C/W Table 1 shows junction-to-ambient thermal resistance for the MIC5232 in the 2mm x 2mm MLF ®-6 package. Package θJA Recommended Minimum Footprint θJC 2mm x 2mm MLF ®-6 90 °C/W 2 °C/W Table 1. MLF Thermal Resistance Substituting PD for PD(max), and solving for the ambient operating temperature, will give the maximum operating conditions for the regulator circuit. The junction-to-ambient thermal resistance for the minimum footprint is 90 °C/W, from Table 1. The maximum power dissipation must not be exceeded for proper operation. For example, when operating the MIC5232-3.3BML at an input voltage of 4.3V and 10mA load with a minimum footprint layout, the maximum ambient operating temperature TA can be determined as follows: W C T C W A / 90 125 01 . 0 ° − ° = TA = 124°C Therefore, a 3.3V application at 10mA of output current can accept an ambient operating temperature of 124°C in a 2mm x 2mm MLF ®-6 package. For a full discussion of heat sinking and thermal effects on voltage regulators, refer to the “Regulator Thermals” section of Micrel’s “Designing with Low-Dropout Voltage Regulators” handbook. This information can be found on Micrel's website at: http://www.micrel.com/_PDF/other/LDOBk_ds.pdf |
Similar Part No. - MIC5232-3.3YD5 |
|
Similar Description - MIC5232-3.3YD5 |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
