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MIC2214-AABML Datasheet(PDF) 9 Page - Micrel Semiconductor |
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MIC2214-AABML Datasheet(HTML) 9 Page - Micrel Semiconductor |
9 / 11 page August 2004 9 MIC2214 MIC2214 Micrel Functional Diagram OUT1 OUT2 POR DRV NGND GND SW CBYP SET EN VIN LDO1 LDO2 Reference POR & Delay SW Logic MIC2214 Fixed Voltage Block Diagram OUT1 OUT2 ADJ2 ADJ1 POR DRV NGND GND SW CBYP SET EN1 VIN1 EN2 VIN2 LDO1 LDO2 Quickstart Reference POR & Delay SW Logic MIC2214 Adjustable Voltage Block Diagram Functional Description The MIC2214 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 300mA of 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. An open-drain driver completes the power manage- ment chipset, offering the capability of driving LEDs for keypad backlighting in applications such as cellphones. Enable The enable input allows for logic control of both output voltages with one enable input. 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. The current source is a 1 µA current source that charges a capacitor up from 0V. When the capacitor reaches 1.25V, the output of the POR is allowed to go high. Open-Drain Driver (DRV) The drive (DRV) pin is an open-drain output capable of sinking 150mA of current. This output is controlled by a logic level input, the switch (SW) pin. The switch pin is an active high input and cannot be left floating. |
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