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MIC2212-DNYML Datasheet(PDF) 9 Page - Micrel Semiconductor |
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MIC2212-DNYML Datasheet(HTML) 9 Page - Micrel Semiconductor |
9 / 10 page February 2006 9 M9999-022106 MIC2212 Micrel, Inc. Functional Diagram OUT1 OUT2 POR GND CBYP SET EN1 EN2 VIN LDO1 LDO2 Reference POR & Del ay MIC2212 Fixed Voltage Block Diagram Functional Description The MIC2212 is a high performance, low quiescent current power management IC consisting of two µCap low dropout regulators, a power-on reset (POR) circuit and an open-drain driver. The first regulator is capable of sourcing 150mA at output voltages from 1.25V to 5V. The second regulator is capable of sourcing 300mAof current at output voltages from 1.25V to 5V. The second regulator has a POR circuit that monitors its output voltage and indicates when the output voltage is within 5% of nominal. The POR offers a delay time that is externally programmable with a single capacitor to ground. 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. Power-On Reset (POR) The power-on reset output is an open-drain N-Channel device, requiring a pull-up resistor to either the input voltage or output voltage for proper voltage levels. The POR output has a delay time that is programmable with a capacitor from the SET pin to ground. The delay time can be programmed to be as long as 1 second. The SET pin is a current source output that charges a capacitor that sets the delay time for the power-on reset output.Thecurrentsourceisa1µAcurrentsourcethatcharges a capacitor up from 0V. When the capacitor reaches 1.25V, the output of the POR is allowed to go high. Input Capacitor Good bypassing is recommended from input to ground to help improve AC performance. A 1µF capacitor or greater located close to the IC is recommended. Bypass Capacitor The internal reference voltage of the MIC2212 can be bypassed with a capacitor to ground to reduce output noise and increase power supply rejection (PSRR). A quick- start feature allows for quick turn-on of the output voltage regardless of the size of the capacitor. The recommended nominal bypass capacitor is 0.01µF, but it can be increased without limit. Output Capacitor Each regulator output requires a 1µF ceramic output capaci- tor for stability. The output capacitor value can be increased to improve transient response, but performance has been optimized for a 1µF ceramic type output capacitor. X7R/X5R dielectric-type ceramic capacitors are recom- mendedbecauseoftheirtemperatureperformance.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 value by as much as 50% and 60% respectively over their operat- ing temperature ranges. To use a ceramic chip capacitor with Y5V dielectric, the value must be much higher than a X7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range. |
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