MIC5014 Micrel Semiconductor, MIC5014 Datasheet
MIC5014
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MIC5014 Summary of contents
Page 1
... N-channel, enhancement-mode, power MOSFETs used as high-side or low-side switches. The MIC5014/5 can sustain an on-state output indefinitely. The MIC5014/5 operates from a 2.75V to 30V supply. In high- side configurations, the driver can control MOSFETs that switch loads 30V. In low-side configurations, with separate supplies, the maximum switched voltage is limited only by the MOSFET ...
Page 2
... MIC5014/5015 Block Diagram Input ( Only on the inverting version Pin Description Pin Number Pin Name Input 3 Source 4 Ground 5 Gate (1) Charge Pump 15V Pin Function Supply. Must be decoupled to isolate from large transients caused by the power MOSFET drain recommended close to pins 1 and 4. ...
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... Note 4: Test conditions reflect worst case high-side driver performance. Low-side and bootstrapped topologies are significantly faster—see Applications Information. Maximum value of switching time seen at 125 C, unit operated at room temperature will reflect the typical value shown. Note 5: “Asserted” refers to a logic high on the MIC5014 and a logic low on the MIC5015. 1997 Operating Ratings (Notes 1,2) (Plastic DIP) ...
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... MIC5014/5015 Typical Characteristics All data measured using FET probe to minimize resistive loading Supply Current (Output Asserted SUPPLY VOLTAGE (V) High-Side Turn-On Time Until Gate = Supply + 4V 100 C = 1300pF GATE 10 1 0.1 0. SUPPLY VOLTAGE (V) ...
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... The internal functions of these devices are controlled via a logic block (refer to block diagram) connected to the control input (pin 2). When the input is off (low for the MIC5014, and high for the MIC5015), all functions are turned off, and the gate of the external power MOSFET is held low via two N- channel switches. This results in a very low standby current ...
Page 6
... MIC5014 (polarities should be reversed if the MIC5015 is used). One the overcurrent trip point has been reached, the comparator will go low, which shuts off the MIC5014. When the the short is removed, feedback to the input pin insures that the MIC5014 will turn back on. This output can also be level shifted and sent to an I/O port of a microcontroller for intelli- gent control ...
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... Also, too large of a kickback voltage (as is found in larger solenoids) can damage the MIC5014 or the power FET by forcing the Source node below ground (the MIC5014 can be driven up to 20V below ground before this happens). A catch diode has been included in this design to provide an alternate route for the inductive kickback current to flow ...
Page 8
... ON. When released, the switch returns to the “RUN” position, and the tachometer’s output is used to hold the MIC5014 input ON. If the motor slows down, the tach output is reduced, and the MIC5014 switches OFF. Resistor “R” sets the shutdown threshold ...
Page 9
... This allows the reversed supply access to the load. Figure 12: High Side Driver WIth Load Protection Push-Pull Driver With No Cross-Conduction (Figure 13) As the turn-off time of the MIC5014/15 devices is much faster than the turn-on time, a simple push-pull driver with no cross conduction can be made using one MIC5014 and one MIC5015. The same control signal is applied to both inputs ...