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MIC4223YMME Datasheet(PDF) 9 Page - Micrel Semiconductor |
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MIC4223YMME Datasheet(HTML) 9 Page - Micrel Semiconductor |
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9 / 20 page  Micrel, Inc. MIC4223/MIC4224/MIC4225 June 2009 9 M9999-061109-A (408) 944-0800 Functional Description The MIC4223, MIC4224 and MIC4225 are a family of dual high speed, high current drivers. The drivers come in both inverting and non-inverting versions. Each driver has an enable pin that turns the output off (low) regardless of the input. The MIC4223 is a dual inverting driver. The MIC4224 is a dual non-inverting driver and the MIC4225 contains an inverting and non-inverting driver. Enable Each output has an independent enable pin that forces the output low when the enable pin is driven low. Each enable pin is internally pulled-up to VDD. The outputs are enabled by default if the enable pin is left open. Pulling the enable pin low, below its threshold voltage, forces the output low. A fast propagation delay between the enable and output pins quickly disables the output, which is a requirement during a system fault condition. Input Stage The driver input stage is high impedance, TTL-compatible input stage. The driver’s input threshold voltage makes it compatible with TTL and CMOS devices that are powered from supply voltages between 3V and VDD. Hysteresis on the input pin improves noise immunity and prevents input signals with slow rise times from falsely triggering the output. The VDD pin current is slightly higher when the input voltage is above the high level threshold. See the Typical Characteristic graphs for additional information. The input voltage signal may go up to -5V below ground without damage to the driver or cause a latch up condition. Negative input voltages that are 0.7V below ground or greater will increase propagation delay. Output Driver Section A functional diagram of the driver output is shown in Figure 2. The output drive is a parallel combination of MOSFET and Bipolar transistor. For a given silicon area, a bipolar device has a lower on-resistance than an equivalent MOS device. It sources and sinks current more consistently as the voltage across it changes. The low drive impedance of the bipolar allows fast turn-on and turn-off of the external MOSFET. The driver’s internal MOSFET gives the output near rail-to-rail drive capability. This ensures a low RDSON for the external MOSFET as well as noise immunity from dv/dt induced glitching. Figure 2. Output Driver The slew rate of the output is non-adjustable and depends only on the VDD voltage and how much capacitance is present at the OUTA, B pin. Changing the slew rate at the driver’s input pin will not affect the output rise or fall times. The slew rate at the MOSFET gate can be adjusted by adding a resistor between the MOSFET gate and the driver output. |
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