MICROCHIP MD1820K6-G

The MD1820 is a high-speed, 4-channel MOSFET driver designed to drive high-voltage P-channel and N-channel MOSFETs for medical ultrasound applications and other applications requiring a high output current for a capacitive load. The high-speed input stage of the MD1820 can operate from a 1.8V to 5V logic interface with an optimum operating input signal range of 1.8V to 3.3V. An adaptive threshold circuit is used to set the level translator switch threshold to the average of the input logic 0 and logic 1 levels. The input logic levels may be ground referenced, even though the driver is putting out bipolar signals. The level translator uses a proprietary circuit, which provides DC coupling together with high-speed operation. The output stage of the MD1820 has separate power connections, enabling the output signal L and H levels to be chosen independently from the supply voltages used for the majority of the circuit. As an example, the input logic levels may be 0V and 1.8V, the control logic may be powered by +5V and -5V and the output L and H levels may be varied anywhere over the range of –5V to +5V. The output stage is capable of peak currents of up to ±2A, depending on the supply voltages used and load capacitance present. The PE pin serves a dual purpose. First, its logic H level is used to compute the threshold voltage level for the channel input level translators. Second, when PE is low, the outputs are High Z. This assists in properly precharging the AC coupling capacitors that may be used in series in the gate drive circuit of an external PMOS and NMOS transistor pair.

• Non-inverting, 4-channel MOSFET Driver
• 6 ns Rise and Fall Time
• 2A Peak Output Source and Sink Currents
• 1.8V to 5V Input CMOS Compatible
• 5V to 10V Total Supply Voltage
• Smart Logic Threshold
• Low-jitter Design
• Four Matched Channels
• Drives Two P-channel and Two N-channel MOSFETs
• Outputs can Swing below Ground
• Low-inductance Quad Flat No-lead Package
• High-performance, Thermally Enhanced Package

• Medical Ultrasound Imaging
• Piezoelectric Transducer Drivers
• Non-destructive Testing (NDT)
• PIN Diode Driver
• CCD Clock Driver/buffer
• High-speed Level Translator