Microchip MD1822 Manual

Microchip Ikke kategoriseret MD1822

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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

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

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

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.

Package Type

16-lead QFN

(Top view)

See Table 2-1 for pin information.

High-Speed 4-Channel MOSFET Driver with Two Inverting

and Two Non-Inverting Outputs

INA

INB OUTB

VDD VH

INC

IND

OUTC

OUTD

GND VSS VL

MD1822

INB

VDD

OUTC

OUTD

GND

Level

Shifter

INA

VSS VL

OUTB

OUTA

VDD VH

INC

IND

SUB

VSS VL

Level

Shifter

Level

Shifter

Level

Shifter

Level

Shifter

VDD

VSS VL

VDD

VSS VL

MD1822

OUTA

MD1822

DS20005706A-page 2  2018 Microchip Technology Inc.

Functional Block Diagrams

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	MD1822

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