MD0101
High-Voltage Protection T/R Switch with Clamp Diodes
Features
General Description
•
•
•
•
•
•
The MD0101 is a four-channel high-voltage
current-limiting protection device. It is designed to
protect a low-noise receiver from high-voltage transmit
pulses in ultrasound applications and is commonly
referred to as a T/R (transmit-and-receive) switch.
Each channel has three terminals: TX, RX, and RGND.
The analog switch terminals are TX and RX. RX has
integrated clamping diodes to RGND to protect the
receiver against high voltages. The output voltages will
be clamped by the anti-parallel diodes to RGND at
about ±0.6V.
Up to ±100V Input Voltage Protection
Low On-Resistance, 15Ω Typical
Integrated Clamp Diodes
Fast Switching Speed
Four Electrically Isolated Channels
No External Supplies Needed
Applications
•
•
•
•
•
Medical Ultrasound Imaging
Non-Destructive Testing Applications
Fast Resettable Fuses
High-Side Switches
Data Acquisition
The MD0101 can be considered as a normally closed
switch with a typical switch resistance of 15Ω, allowing
small signals to pass. Once the voltage drop across the
switch exceeds a nominal value of ±1V, the device
turns off. In the OFF state, the MD0101 can withstand
up to ±100V across its terminals. A small amount of
current (200 µA, typically) is allowed to flow through.
The MD0101 is not limited to just ultrasound
applications. It can also be used as resettable fuses to
protect power lines, for output short-circuit protection,
and for protection of data acquisition instruments. The
MD0101 is available in an 18-lead, 5 x 5 mm DFN
package.
Package Type
18-lead DFN
(Top view)
NC
1
Tx1 2
NC
3
Tx2 4
NC
5
Tx3 6
NC
7
Tx4 8
NC
9
18 NC
17 Rx1
16 RGND1
15 Rx2
14 RGND2
13 Rx3
12 RGND3
11 Rx4
10 RGND4
See Table 2-1 for pin information.
2020 Microchip Technology Inc.
DS20005916A-page 1
MD0101
Functional Block Diagram
TX
RX
Switch Control
DS20005916A-page 2
RGND
2020 Microchip Technology Inc.
MD0101
Typical Application Circuit
One of
128 Channels
+90V
Piezo
Transducers
Transmitter
-90V
Logic
Control
and
Signal
Processing
TX
RX
RX
MD0101
TX
RGND
Receiver
High Voltage
Switches
T/R Switch
2020 Microchip Technology Inc.
DS20005916A-page 3
MD0101
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings†
Differential Voltage, VTX–VRX ....................................................................................................................... 0V to +110V
Maximum Junction Temperature, TJ.................................................................................................................... +125°C
Storage Temperature, TS...................................................................................................................... –65°C to +150°C
Power Dissipation:
18-lead DFN (Note 1)................................................................................................................................... 2.5W
ESD Rating (Note 2) ................................................................................................................................ ESD sensitive
† Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. This is a stress rating only, and functional operation of the device at those or any other conditions above those
indicated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for
extended periods may affect device reliability.
Note 1: Mounted on an FR4 board, 25 mm x 25 mm x 1.57 mm
2: Device is ESD sensitive. Handling precautions are recommended.
DC ELECTRICAL CHARACTERISTICS
Electrical Specifications: TA = 25°C unless otherwise specified.
Parameter
Sym.
Min.
Typ.
Max.
Unit
VTX-RX
±100
—
—
V
ITX–RX = ±500 µA
Switch-On Resistance from TX to
RX
RSW
—
15
—
Ω
ITX–RX = ±5 mA
VTX-RX Trip Point to Turn Off
VTRIP
—
±1
±2
V
VOFF
—
±2
—
V
ITX–RX = ±1 mA
IA-B(OFF)
—
±200
±300
µA
VTX–RX = ±100V
Maximum Differential Input Voltage
from TX to RX
Switch Turn-Off Voltage
Switch-Off Current
Conditions
AC ELECTRICAL CHARACTERISTICS
Electrical Specifications: TA = 25°C unless otherwise specified.
Parameter
Sym.
Min.
Typ.
Max.
Unit
Peak Switching Current
IPEAK
—
±60
—
mA
Turn-Off Time
TOFF
—
—
20
ns
Turn-On Time
TON
—
—
20
ns
Switch-On Capacitance from TX to
RX
CTX(ON)
—
15
—
pF
SW = ON
Switch-Off Capacitance from TX to
RX
CTX(OFF)
—
9
—
pF
VTX–RX = 25V
Small Signal Bandwidth
BW
—
100
—
Diode Forward Voltage Drop
VRX
—
±1.6
—
V
IRX = ±200 mA, RGND = 0V,
TX = Open
RX Capacitance to RGND
CD
—
20
—
pF
RGND = 0V, TX = Open
DS20005916A-page 4
Conditions
MHz RLOAD = 50Ω
2020 Microchip Technology Inc.
MD0101
TEMPERATURE SPECIFICATIONS
Parameter
Sym.
Min.
Typ.
Max.
Unit
Operating Junction Temperature
TJ
–40
—
+125
°C
Storage Temperature
TS
–65
—
+150
°C
θJA
—
40
—
°C/W
Conditions
TEMPERATURE RANGE
PACKAGE THERMAL RESISTANCE
18-lead DFN
Note 1:
Note 1
1 oz. 4-layer 3” x 4” PCB with thermal pad and thermal via array
2020 Microchip Technology Inc.
DS20005916A-page 5
MD0101
Typical I-V Characteristics
+IPEAK
ITX - RX
ITX - RX = +200μA
-100V
-VOFF
+1.0mA
-VTRIP
+VTRIP
+1.0mA
+VOFF
VTX - RX
+100V
ITX - RX = -200μA
RSW = 15Ω
-IPEAK
DS20005916A-page 6
2020 Microchip Technology Inc.
MD0101
2.0
PIN DESCRIPTION
Functional descriptions for the pins are listed in
Table 2-1. See Package Type for the location of pins.
TABLE 2-1:
PIN FUNCTION TABLE
Pin Number
Pin Name
1
NC
No internal connection
2
TX1
Transmitter side of Transmit/Receive Switch 1
3
NC
No internal connection
4
TX2
Transmitter side of Transmit/Receive Switch 2
5
NC
No internal connection
6
TX3
Transmitter side of Transmit/Receive Switch 3
7
NC
No internal connection
8
TX4
Transmitter side of Transmit/Receive Switch 4
9
NC
No internal connection
10
RGND4
11
RX4
12
RGND3
13
RX3
14
RGND2
15
RX2
16
RGND1
17
RX1
Receiver side for Transmit/Receive Switch 1
18
NC
No internal connection
Center Tab
2020 Microchip Technology Inc.
Description
Clamp diode ground for Transmit/Receive Switch 4
Receiver side for Transmit/Receive Switch 4
Clamp diode ground for Transmit/Receive Switch 3
Receiver side for Transmit/Receive Switch 3
Clamp diode ground for Transmit/Receive Switch 2
Receiver side for Transmit/Receive Switch 2
Clamp diode ground for Transmit/Receive Switch 1
Connect to ground
DS20005916A-page 7
MD0101
DETAILED DESCRIPTION
The MD0101 can be considered a normally closed
switch controlled by a control circuit. (See Functional
Block Diagram.) The control circuit monitors the
voltage drop across Terminals TX and RX. If the
voltage difference is greater than ±1V, the T/R switch
opens. Once in the Open state, there is a small amount
of current flowing through the T/R switch (200 µA) to
detect if the high voltage is still present. The T/R switch
does not close until the voltage across Terminals TX
and RX drops below ±2V. Connecting the RGND to
ground allows the initial peak current (about 60 mA) to
flow to GND through the switch and the clamp diodes.
The clamp diode I-V Curve is shown in Figure 3-8. If
external diodes are used, the RGND pin can be
connected to the corresponding RX pin or left floating.
The external diodes can then be connected between
RX and GND.
3.1
On Resistance
When the voltage across Terminals TX and RX is within
±2V, the switch is in Receive mode and the RON is
typically 15Ω. Once the voltage across Terminals TX
and RX is greater than ±2V, the switch changes to
Transmit mode and prevents high-voltage pulses from
passing through to the receiver.
3.2
20
19
18
17
CSW (pF)
3.0
16
15
14
13
12
11
10
0
10
20
FIGURE 3-1:
3.3
50
60
70
80
90
CTX-RX vs. VTX-RX.
TON and TOFF Time
The TON and TOFF of MD0101 are less than 20 ns,
which provides a quick transition between Transmit
and Receive modes. TON and TOFF times are
proportional to the rise and fall times of the transmit
pulses. Setups used to measure TOFF and TON are
illustrated in Figure 3-2 and Figure 3-5, respectively.
500ns
Transmitter
+10V
0V
TX
The switch-off capacitance is a function of the voltage
across the T/R switch. The CTX(OFF) is about
11 pF to 6.5 pF for 10V to 90V of transmit voltage. Refer
to Figure 3-1 for the C–V curve of CTX(OFF).
RX
10Ω
FIGURE 3-2:
DS20005916A-page 8
40
VSW (V)
Switch Capacitance
The typical switch-on capacitance, CSW(ON), is 21 pF.
This is measured from TX to RX when the switch is
turned on.
30
MD0101
TX
RGND
(Floating or connect to RX)
Test Setup for TOFF.
2020 Microchip Technology Inc.
MD0101
VTX
+10V
+10V
VTX
+2V
0V
+2V
VRX
2V
1V
1V
10%
VRX
0V
FIGURE 3-3:
TOFF Timing Diagram.
FIGURE 3-6:
TON Timing Diagram.
FIGURE 3-4:
TOFF at VTX = 10V.
FIGURE 3-7:
TON at VTX = 10V.
Figure 3-4 shows the actual waveform and
measurement of the TOFF. TOFF is measured from 2V of
the VTX to 10% of the VRX.
Figure 3-7 illustrates the actual waveform and
measurement of the TON. The TON is measured from
2V of the VTX to 1V of the VRX.
I-V Curve
500ns
Transmitter
500
+10V
450
400
350
If (mA)
0V
TX
300
250
200
150
100
2.0V
50
0
0.00
15Ω
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
Vf (V)
RX
MD0101
TX
FIGURE 3-8:
RX Clamp Diodes to RGND.
RGND
(Floating or connect to RX)
FIGURE 3-5:
Test Setup for TON.
2020 Microchip Technology Inc.
DS20005916A-page 9
MD0101
4.0
PACKAGING INFORMATION
4.1
Package Marking Information
18-lead DFN
XXXXXXX
XXXXXXX
e3 YYWW
NNN
Legend: XX...X
Y
YY
WW
NNN
e3
*
Note:
DS20005916A-page 10
Example
MD0101
K6
e3 2038
853
Product Code or Customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC® designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available characters
for product code or customer-specific information. Package may or not include
the corporate logo.
2020 Microchip Technology Inc.
MD0101
Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging.
2020 Microchip Technology Inc.
DS20005916A-page 11
MD0101
NOTES:
DS20005916A-page 12
2020 Microchip Technology Inc.
MD0101
APPENDIX A:
REVISION HISTORY
Revision A (May 2020)
• Converted Supertex Doc# DSFP-MD0101 to
Microchip DS20005916A
• Changed the package marking format
• Removed the 18-lead DFN (5 x 5) K6 M932 package type
• Made minor text changes throughout the document
2020 Microchip Technology Inc.
DS20005916A-page 13
MD0101
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, contact your local Microchip representative or sales office.
XX
PART NO.
-
Package
Options
Device
X
-
Environmental
X
Media Type
Device:
MD0101
=
High-Voltage Protection T/R Switch with
Clamp Diodes
Package:
K6
=
18-lead DFN
Environmental:
G
=
Lead (Pb)-free/RoHS-compliant Package
Media Type:
(blank)
=
490/Tray for a K6 Package
DS20005916A-page 14
Example:
a) MD0101K6-G:
High-Voltage Protection T/R
Switch with Clamp Diodes,
18-lead DFN, 490/Tray
2020 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
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and may be superseded by updates. It is your responsibility to
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please visit www.microchip.com/quality.
2020 Microchip Technology Inc.
ISBN: 978-1-5224-6158-6
DS20005916A-page 15
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DS20005916A-page 16
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2020 Microchip Technology Inc.
02/28/20
