Supertex inc.
High Speed, Four Channel MOSFET Driver
with Non-Inverting Outputs
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MD1820
Features
Non-inverting, four channel MOSFET driver
6.0ns rise and fall time
2.0A peak output source/sink current
1.8 to 5.0V input CMOS compatible
5.0 to 10V total supply voltage
General Description
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Smart logic threshold
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Low jitter design
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Four matched channels
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Drives two P- and two N-channel MOSFETs
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Outputs can swing below ground
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Low inductance quad flat no-lead package
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High performance, thermally-enhanced
package
The Supertex MD1820 is a high speed, four channel 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 MD1820
can operate from a 1.8 to 5.0V logic interface with an optimum operating
input signal range of 1.8 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 MD1820 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 1.8V, the control logic
may be powered by +5.0 and -5.0V, 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 ±2.0A, 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. Second, when PE
is low, the outputs are HiZ. 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.
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Applications
Medical ultrasound imaging
Piezoelectric transducer drivers
Non-Destructive Testing (NDT)
PIN diode driver
CCD Clock driver/buffer
High speed level translator
Typical Application Circuit
0.47µF
+10V
+10V
+100V
0.47µF
VDD
VH
1.0µF
PE
INA
OUTA
OUTB
OUTC
OUTD
GND
VSS
VL
10nF
10nF
3.3V CMOS
Logic Inputs
-100V
INB
INC
IND
Supertex
TC6320
1.0µF
+10V
1.0µF
HV
OUT
10nF
Supertex
MD1820
10nF
-10V
Supertex
TC6320
1.0µF
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com
MD1820
Ordering Information
Device
MD1820
3.00x3.00mm body
1.00mm height (max)
0.50mm pitch
16-Lead QFN
MD1820K6-G
-G indicates package is RoHS compliant (‘Green’)
Absolute Maximum Ratings
Parameter
V
DD
-V
SS
, Logic supply voltage
V
H
, Output high supply voltage
V
L
, Output low supply voltage
V
SS
, Low side supply voltage
Logic input levels
Maximum junction temperature
Storage temperature
Operating temperature
Package power dissipation
Thermal resistance (θ
JA
)*
Value
-0.5V to +12.5V
V
L
- 0.5V to V
DD
+0.5V
V
SS
- 0.5V to V
H
+0.5V
-6.0V to +0.5V
V
SS
- 0.5V to GND +5.5V
+125°C
-65°C to 150°C
-20°C to +85°C
2.2W
55°C/W
Pin Configuration
16
1
16-Lead QFN (K6)
(top view)
Product Marking
1820
YWLL
Y = Last Digit of Year Sealed
W = Code for Week Sealed
L = Lot Number
= “Green” Packaging
Absolute Maximum Ratings are those values beyond which damage to the device
may occur. Functional operation under these conditions is not implied. Continuous
operation of the device at the absolute rating level may affect device reliability. All
voltages are referenced to device ground.
* 1.0oz 4-layer 3x4” PCB
Package may or may not include the following marks: Si or
16-Lead QFN (K6)
H
DC Electrical Characteristics
(V
Sym
V
DD
- V
SS
V
SS
V
H
V
L
I
DDQ
I
HQ
I
DDQ
I
HQ
I
DD
I
H
V
IH
V
IL
I
IH
I
IL
V
IH
V
IL
R
IN_PE
Parameter
Logic supply voltage
Low side supply voltage
Output high supply voltage
Output low supply voltage
V
DD
quiescent current
V
H
quiescent current
V
DD
quiescent current
V
H
quiescent current
V
DD
average current
V
H
average current
Input logic voltage high
Input logic voltage low
Input logic current high
Input logic current low
PE input logic voltage high
PE input logic voltage low
PE input impedance to GND
= V
DD
= 10V, V
L
= V
SS
= GND = 0V, V
PE
= 3.3V, T
A
= 25°C)
Min
4.75
-5.5
V
SS
+2.0
V
SS
-
-
-
-
-
-
V
PE
-0.3
0
-
-
1.70
0
100
Typ
-
-
-
-
60
2.0
0.8
2.0
3.5
10
-
-
-
3.30
-
-
Max
11.5
0
V
DD
V
DD
-4.0
-
-
-
-
-
-
V
PE
0.3
1.0
1.0
5.25
0.3
-
Units
V
V
V
V
µA
µA
mA
µA
mA
mA
V
V
µA
µA
V
V
KΩ
Conditions
4.0V ≤ V
DD
≤11.5V
---
---
---
No input transitions, PE = 0
No input transitions, PE = 1
One channel on at 5.0Mhz,
No load
For logic inputs INA, INB, INC,
and IND
For logic input PE
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
2
Tel: 408-222-8888
www.supertex.com
MD1820
DC Electrical Characteristics
(cont.)
(V
Sym
C
IN
R
SINK
R
SOURCE
I
SINK
I
SOURCE
Parameter
Logic input capacitance
Output sink resistance
Output source resistance
Peak output sink current
Peak output source current
H
H
= V
DD
= 10V, V
L
= V
SS
= GND = 0V, V
PE
= 3.3V, T
A
= 25°C)
Min
-
-
-
-
-
Typ
5.0
1.5
2.0
2.0
2.0
Max
10
-
-
-
-
Units
pF
Ω
Ω
A
A
Conditions
---
I
SINK
= 50mA
I
SOURCE
= 50mA
---
---
AC Electrical Characteristics
(V
Sym
t
irf
t
PLH
t
PHL
t
r
t
f
l t
r
- t
f
l
l t
PLH
-t
PHL
l
∆t
dm
t
PE-ON
t
PE-OFF
Parameter
Input or PE rise & fall time
Propagation delay when output
is from low to high
Propagation delay when output
is from high to low
Output rise time
Output fall time
Rise and fall time matching
Propagation low to high and
high to low matching
Propagation delay matching
PE on-time
PE off-time
= V
DD
= 10V, V
L
= V
SS
= GND = 0V, V
PE
= 3.3V, T
A
= 25°C)
Min
-
-
-
-
-
-
-
-
-
-
Typ
-
6.5
6.5
7.0
7.0
1.0
1.0
±2.0
-
-
Max
10
-
-
-
-
-
-
-
5.0
4.0
Units
ns
ns
ns
ns
ns
ns
ns
ns
µs
µs
Conditions
Logic input edge speed
requirement
C
LOAD
= 1000pF, see timing
diagram
Input signal rise/fall time 2.0ns
For each channel
Device to device delay match
V
PE
= 1.7 ~ 5.25V
V
DD
= 7.5 ~ 11.5V
-20 ~ 85
O
C
Logic Truth Table
Logic Inputs
PE
H
H
L
IN
L
H
X
Output
V
L
V
H
High Z
Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
3
Tel: 408-222-8888
www.supertex.com
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