Microchip MD1822 Bedienungsanleitung
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2018 Microchip Technology Inc.DS20005706A-page 1
MD1822
Features
•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
MOSFET
s
•Outputs can swing below Ground
•Low-Inductance, Quad-Flat No-Lead Package
•High-Performance, Thermally Enhanced
Pac
kaging
Applications
•Medical Ultrasound Imaging
•Piezoelectric Transducer Drivers
•Non-Destructive Testing
•PIN Diode Driver
•CCD Clock Driver/Buffer
•High-Speed Level Translator
General Description
The MD1822 is a high-speed, four-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 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 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 MD1822 has separate power
co
nnections, 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 Figure3-1.) 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.
Package Type
16-lead QFN
(Top view)
1
See Table 2-1 for pin information.
High-Speed 4-Channel MOSFET Driver with Two Inverting
and Two Non-Inverting Outputs
Produktspezifikationen
| Marke: | Microchip |
| Kategorie: | Nicht kategorisiert |
| Modell: | MD1822 |
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