MD1812 Supertex, Inc., MD1812 Datasheet

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MD1812

Manufacturer Part Number
MD1812
Description
High Speed Quad Mosfet Driver
Manufacturer
Supertex, Inc.
Datasheet
Features
Applications
Typical Application Circuit
6.0ns rise and fall time
2.0A peak output source/sink current
1.2 to 5.0V input CMOS compatible
±5.0 to ±9.0V 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 application
Low inductance quad flat no-lead package
Thermally-enhanced package
Ultrasound PN code transmitter
Medical ultrasound imaging
Piezoelectric transducer drivers
Nondestructive evaluation
High speed level translator
High voltage bipolar pulser
3.3V CMOS
Logic Inputs
15
16
High Speed Quad MOSFET Driver
1
5
6
0.22 F
O
I
I
I
I
NA
NB
NC
ND
E
+10V
GND
3
VDD
14
7
VSS
Supertex
MD1812
2
VL
LT
11
4
VNEG
0.47 F
VH
OUTG
OUTC
OUTD
OUTA
OUTB
+10V
-9.0V
General Description
The Supertex MD1812 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 MD1812 is a high-speed
level translator that is able to operate from logic input signals
of 1.2 to 5.0V 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 MD1812 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 -
5.0 to +5.0V. The output stage is capable of peak currents of
up to ±2.0 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 and C outputs high and
the B and D outputs 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 provides PMOS gate negative bias drive. This enables
the user-defined damping control to generate return-to-zero
bipolar output pulses.
0.47 F
13
12
10
9
8
2K
10nF
10nF
10nF
Supertex
Supertex
TC6320
TC2320
+100V
-100V
1 F
1 F
MD1812

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MD1812 Summary of contents

Page 1

... 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 MD1812 is a high-speed level translator that is able to operate from logic input signals of 1.2 to 5.0V 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 ...

Page 2

... quiescent current NEGQ NEG I V average current average current average current NEG NEG 16-Lead QFN 4x4mm body, MD1812K6-G Pin Configuration Value -0.5V to +13.5V V -0. +0. -0. +0. -7.0V to +0.5V V -10V to V +0. -0.5V to GND +7.0V SS +125°C -65° ...

Page 3

DC Electrical Characteristics ( 12V GND = 0V NEG Sym Parameter V Input logic voltage high IH V Input logic voltage low IL I Input logic current high ...

Page 4

... VH. All inputs must be kept low until the device is powered up. Good trace practices should be followed corresponding to the desired operating speed. The internal circuitry of the MD1812 is capable of operating up to 100MHz, with the primary speed limitation being the loading effects of the load capacitance. ...

Page 5

Logic Truth Table Logic Inputs OE INA INC Pin Description Pin # Function Description 1 INB Logic input. Controls ...

Page 6

... Dimensions marked with (*) are non-JEDEC dimensions. The value listed is for reference only. Drawings not to scale. (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to http://www.supertex.com/packaging.html.) Doc.# DSFP-MD1812 A051408 θ ...

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