MD1821
High-Speed 4-Channel MOSFET Driver with Inverting Outputs
Features
General Description
• Inverting MOSFET Driver
• 6 ns Rise and Fall Time
The MD1821 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 MD1821 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.
• 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
The output stage of the MD1821 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 +5 and –5V and the output
L and H levels may be varied anywhere over the range
of –5 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 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.
Applications
• Medical Ultrasound Imaging
• Piezoelectric Transducer Drivers
• Non-destructive Testing (NDT)
• PIN Diode Driver
• CCD Clock Driver/buffer
• High-speed Level Translator
Package Type
16-lead QFN
(Top view)
1
See Table 2-1 for pin information.
2017 Microchip Technology Inc.
DS20005768A-page 1