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MIC2211-FMBML Datasheet(PDF) 8 Page - Micrel Semiconductor |
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MIC2211-FMBML Datasheet(HTML) 8 Page - Micrel Semiconductor |
8 / 9 page MIC2211 Micrel M9999-090204 8 August 2004 Functional Diagram OUT1 OUT2 GND EN2 CBYP EN1 VIN LDO1 LDO2 Reference MIC2211 Fixed Voltage Block Diagram Functional Description The MIC2211 is a high performance, low quiescent current power management IC consisting of two µCap low dropout regulators. The first regulator is capable of sourcing 150mA at output voltages from 1.25V to 5V. The second regulator is capable of sourcing 300mA of current at output voltages from 1.25V to 5V. Enable 1 and 2 The enable inputs allow for logic control of both output voltages with individual enable inputs. The enable input is active high, requiring 1.8V for guaranteed operation. The enable input is CMOS logic and cannot by left floating. Input Capacitor Good bypassing is recommended from input to ground to help improve AC performance. A 1 µF capacitor or greater located close to the IC is recommended. Bypass Capacitor The internal reference voltage of the MIC2211 can be by- passed with a capacitor to ground to reduce output noise and increase power supply rejection (PSRR). A quick-start fea- ture allows for quick turn-on of the output voltage regardless of the size of the capacitor. The recommended nominal bypass capacitor is 0.01 µF, but it can be increased without limit. Output Capacitor Each regulator output requires a 1 µF ceramic output capaci- tor for stability. The output capacitor value can be increased to improve transient response, but performance has been optimized for a 1 µF ceramic type output capacitor. X7R/X5R dielectric-type ceramic capacitors are recom- mended because of their temperature performance. X7R- type capacitors change capacitance by 15% over their oper- ating temperature range and are the most stable type of ceramic capacitors. Z5U and Y5V dielectric capacitors change value by as much as 50% and 60% respectively over their operating temperature ranges. To use a ceramic chip capaci- tor with Y5V dielectric, the value must be much higher than an X7R ceramic capacitor to ensure the same minimum capaci- tance over the equivalent operating temperature range. |
Similar Part No. - MIC2211-FMBML |
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Similar Description - MIC2211-FMBML |
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