Microchip Technology MD1822K6-G

Description
The MD1822 is a high-speed, four-channel MOSFET driver designed for driving 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 MD1822 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 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 MD1822 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. (See Figure 3-1.) Second, when PE is low, the outputs are disabled, with the A and C outputs high and the B and D outputs low. 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.

Features
High-Speed 4-Channel MOSFET Driver with Two Inverting and Two Non-Inverting Outputs
Mixed Inversion MOSFET Driver
6 ns Rise and Fall Time
2A Peak Output Source-and-Sink Current
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 Packaging

Applications
Medical Ultrasound Imaging
Piezoelectric Transducer Drivers
Non-Destructive Testing
PIN Diode Driver
CCD Clock Driver/Buffer
High-Speed Level Translator