MD1811
High Speed Quad MOSFET Driver
Features
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6ns rise and fall time
2 A peak output source/sink current
1.2V to 5V input CMOS compatible
5V to 12V total supply voltage
Smart Logic threshold
Low jitter design
Quad matched channels
Drives two P- and two N-channel MOSFETs
Outputs can swing below ground
Low inductance quad flat no-lead package
High-performance thermally-enhanced
General Description
The Supertex MD1811 is a high speed, quad MOSFET driver
designed to drive high voltage P 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 MD1811 can operate from a 1.2 to 5.0 volt logic interface with an
optimum operating input signal range of 1.8 to 3.3 volts. 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 MD1811 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 0 and 1.8 volts, the control
logic may be powered by +5 and –5 volts, and the output L and H
levels may be varied anywhere over the range of –5 to +5 volts. The
output stage is capable of peak currents of up to ±2 amps, depending
on the supply voltages used and load capacitance present. 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 & C
output high and the B & D output low. This assists in properly pre-
charging the AC coupling capacitors that may be used in series in the
gate drive circuit of an external PMOS and NMOS transistor pair.
Applications
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Medical ultrasound imaging
Piezoelectric transducer drivers
Nondestructive evaluation
PIN diode driver
Clock driver/buffer
High speed level translator
Typical Application Circuit
+10V
0.22 F
+10V
0.47 F
V
DD
V
H
OUTA
10nF
INB
OUTB
Supertex
TC6320
10nF
+100V
1 F
ENAB
+PLS1
#1
3.3V CMOS
Logic Inputs
-PLS1
OE
INA
To Piezoelectric
Transducer #1
-100V
1 F
+PLS2
#2
-PLS2
INC
OUTC
+100V
1 F
IND
GND
V
SS
OUTD
V
L
10nF
To Piezoelectric
Transducer #2
Supertex MD1811
10nF
-100V
Supertex
TC6320
1 F
SUPERTEX [ Supertex, Inc ]
