Supertex inc.

Supertex inc.

1

NR031706

MD1813

Initial Release

Features

6ns rise and fall time

2A peak output source/sink current

1.2V to 5V input CMOS compatible

±5V to ±12V supply voltage operation

Smart Logic threshold

Low jitter design

Quad matched channels

Drives two N and two P-channel MOSFETs

Outputs can swing below ground

Built-in level translator for negative gate bias

User-defined damping for return-to-zero applications

Non-inverting gate driver OUT

Low inductance quad flat no-lead package

Thermally-enhanced package

Applications

Ultrasound PN code transmitter

Medical ultrasound imaging

Piezoelectric transducer drivers

Nondestructive evaluation

High speed level translator

High voltage bipolar pulser

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General Description

The Supertex MD1813 is a high-speed quad MOSFET driver. It is

designed to drive two N and two P-channel, high voltage, DMOS FETs for

medical ultrasound applications, but may be used in any application that

needs a high output current for a capacitive load. The input stage of the

MD1813 is a high-speed level translator that is able to operate from logic

input signals of 1.2 to 5.0 volt amplitude. An adaptive threshold circuit is

used to set the level translator threshold to the average of the input logic

0 and logic 1 levels. The level translator uses a proprietary circuit, which

provides DC coupling together with high-speed operation.

The output stage of the MD1813 has separate power connections,

enabling the output signal L and H levels to be chosen independently

from the driver supply voltages. 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 ±2 amps,

depending on the supply voltages used and load capacitance. The OE

pin serves a dual purpose. First, its logic H level is used to compute the

threshold voltage level for the channel input level translators. Secondly,

when OE is low, the outputs are disabled, with the A output high and the

B output low. This assists in properly pre-charging the coupling capacitors

that may be used in series in the gate drive circuit of an external PMOS

and NMOS. A built-in level shifter is for PMOS gate negative bias driving.

It enables the user-defined damping control to generate return-to-zero

bipolar output pulses. The MD1813 has a non-inverting driver OUT

easy logic.

Typical Application Circuit

High Speed Quad MOSFET Driver

3.3V CMOS

Logic Inputs

10nF

10nF

10nF

+100V

1F

-100V

1F

+10V

0.22 F

V

DD

V

H

+10V

0.47 F

V

SS

V

L

V

NEG

GND

OE

-10V

0.47 F

LT

2K

Supertex

MD1813

Supertex

TC2320

Supertex

TC6320

ENAB

PULSE

DAMP

To Piezoelectric

Transducer

16

15

1

5

6

3

7

2

4

8

9

10

12

13

11

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