MIC5011 Micrel Semiconductor, MIC5011 Datasheet
MIC5011
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MIC5011 Summary of contents
Page 1
... MIC5011 is extremely easy to use, requiring only a power FET and nominal supply decoupling to implement either a high- or low-side switch. The MIC5011 charges a 1nF load typical with no external components. Faster switching is achieved by add- ing two 1nF charge pump capacitors. Operation down to 4.75V allows the MIC5011 to drive standard MOSFETs in 5V low-side applications by boosting the gate voltage above the logic supply ...
Page 2
... Can safely swing to –10V when turning off inductive loads. Gate Drives and clamps the gate of the power FET. Will be clamped to approxi- mately –0. internal diode when turning off inductive loads. Optional 1nF capacitors reduce gate turn-on time; C2 has dominant effect. MIC5011 ...
Page 3
... Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device beyond its specified Operating Ratings. Note 2 The MIC5011 is ESD sensitive. Note 3 Minimum and maximum Electrical Characteristics are 100% tested at T range. Typicals are characterized and represent the most likely parametric norm. ...
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... SUPPLY VOLTAGE (V) High-side Turn-on Time* 3.5 3.0 2.5 2.0 1.5 1.0 0 SUPPLY VOLTAGE ( Time for gate to reach test circuit with MIC5011 GATE =10 nF GATE – 5V Gate Voltage above Supply ...
Page 5
... GATE SUPPLY VOLTAGE (V) Low-side Turn-on Time for Gate = 10V 3000 C2=1 nF 1000 C =10 nF GATE 300 100 GATE SUPPLY VOLTAGE (V) Turn-on Time 2.0 1.75 1.5 1.25 1.0 0.75 0.5 – 100 125 DIE TEMPERATURE (°C) Micrel 15 15 MIC5011 ...
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... Input Applications Information Functional Description (Refer to Block Diagram) The MIC5011 functions are controlled via a logic block connected to the input pin 2. When the input is low, all functions are turned off for low standby current and the gate of the power MOSFET is also held low through 500 to an N-channel switch ...
Page 7
... High-side drivers implemented with MIC501X drivers are self-protected against inductive switching transients. Dur- ing turn-off an inductive load will force the MOSFET source 5V or more below ground, while the MIC5011 holds the gate July 2000 (Continued) at ground potential. The MOSFET is forced into conduction, and it dissipates the energy stored in the load inductance ...
Page 8
... The MIC5011 and MOSFET are configured as a low-side driver, but the load is connected in series with ground. Power for the MIC5011 is supplied by a charge pump. A 20kHz square wave (15Vp-p) drives the pump capacitor and delivers current to a 100 F storage capacitor. A zener ...
Page 9
... Squarewave diode limits the supply to 18V. When the MIC5011 is off, power is supplied by a diode connected to a 15V supply. The circuit of Figure 5 is put to good use as a barrier between low voltage control circuitry and the 90V motor supply. ...
Page 10
... MIC5011. When the motor is stalled there is no tachometer output, and MIC5011 input is pulled high delivering full power to the motor. If the motor spins fast enough, the tachometer output is sufficient to pull the MIC5011 input low, shutting the output off ...
Page 11
... Q1-Q5, and the capacitors) and 2) gate turn-off switch (Q6). When the MIC5011 is in the OFF state, the oscillator is turned off, thereby disabling the charge pump also turned off, and Q6 is turned on. Q6 holds the gate pin (G) at ground potential which effectively turns the external MOS- FET off ...
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... This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. MIC5011 PIN 1 DIMENSIONS: INCH (MM) 0 ...