MD0105
4-Channel High-Voltage Protection T/R Switch
Features
General Description
•
•
•
•
•
The MD0105 is a high-voltage current-limiting
protection device. It is designed to protect a low-noise
receiver from high-voltage transmit pulses in
ultrasound applications. The MD0105 is commonly
referred to as a T/R (transmit-and-receive) switch.
Up to ±130V Input Voltage Protection
Low On-Resistance – 15Ω Typical
Fast Switching Speed
Four Electrically Isolated Channels
No External Supplies Needed
The device can be considered as a normally closed
switch with a typical switching resistance of 15Ω that
allows small signals to pass. Once the voltage drop
across the two terminals exceeds a nominal value of
±2V, the device will turn off. In the OFF state, the
MD0105 can withstand up to ±130V across its
terminals. A small amount of current (typically 200 µA)
is allowed to flow through.
Applications
•
•
•
•
•
Medical Ultrasound Imaging
NDT Applications
Fast Resettable Fuses
High-Side Switches
Data Acquisition
The MD0105 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 to protect data acquisition instruments. The
MD0105 is available in an 18-lead 5 x 5 mm DFN
package as a 4-channel device.
Package Type
18-lead DFN
(Top view)
1
18
NC
A1
2
17
B1
NC
3
16
NC
A2
4
15
B2
NC
5
14
NC
A3
6
13
B3
NC
7
12
NC
A4
8
11
B4
NC
9
10
NC
NC
See Table 2-1 for pin information. Pads are at the bottom of device.
2018 Microchip Technology Inc.
DS20005739A-page 1
MD0105
Functional Block Diagram
COM
Switch Control
A
DS20005739A-page 2
B
2018 Microchip Technology Inc.
MD0105
Typical Application Circuit
+130V
Piezo
Transducers
Transmitter
-130V
Logic
Control
and
Signal
Processing
TX
RX
Receiver
2018 Microchip Technology Inc.
B
MD0105
T/R Switch
A
High Voltage
Switches
DS20005739A-page 3
MD0105
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings†
Differential Voltage, VA-B ............................................................................................................................ 0V to +140V
Maximum Junction Temperature, TJ ................................................................................................................... +125°C
Storage Temperature, TS ..................................................................................................................... –65°C to +150°C
Power Dissipation:
18-lead DFN ................................................................................................................................................. 1.6W
† 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: Device is ESD sensitive. Handling precautions are recommended.
DC ELECTRICAL CHARACTERISTICS
Electrical Specifications: TJ = 25°C unless otherwise specified.
Parameter
Sym.
Min.
Typ.
Max.
Unit
VA-B
±130
—
—
V
IA-B = ±1 mA
Switch-On Resistance from A to B
RSW
—
15
—
Ω
IA-B = ±5 mA
VA-B Trip Point to Turn Off
VTRIP
—
±1
±2
V
VOFF
—
±2
—
V
IA-B = ±1 mA
IA-B(OFF)
—
±200
±300
µA
VA-B = ±130V
Max.
Unit
Maximum Differential Input Voltage
from A to B
Switch Turn-Off Voltage
Switch-Off Current
Conditions
AC ELECTRICAL CHARACTERISTICS
Electrical Specifications: TJ = 25°C unless otherwise specified.
Parameter
Sym.
Min.
Typ.
Peak Switching Current
IPEAK
—
±60
—
mA
Turn-Off Time
TOFF
—
—
20
ns
Turn-On Time
Conditions
TON
—
—
20
ns
Switch-On Capacitance from A to B
CSW(ON)
—
21
—
pF
SW = ON
Switch-Off Capacitance from A to B
CSW(OFF)
—
15
—
pF
VSW = 25V
BW
—
100
—
Sym.
Min.
Typ.
Max.
Unit
Operating Junction Temperature
TJ
–40
—
+125
°C
Storage Temperature
TS
–65
—
+150
°C
JA
—
40
—
°C/W
Small Signal Bandwidth
MHz RLOAD = 50Ω
TEMPERATURE SPECIFICATIONS
Parameter
Conditions
TEMPERATURE RANGE
PACKAGE THERMAL RESISTANCE
18-lead DFN
Note 1:
Note 1
Mounted on an FR4 board, 25 mm x 25 mm x 1.57 mm
DS20005739A-page 4
2018 Microchip Technology Inc.
MD0105
Typical I-V Characteristics
+IPEAK
IA-B
IA-B = +200μA
-130V
-VOFF
+1.0mA
-VTRIP
+VTRIP
+1.0mA
+VOFF
VA-B
+130V
IA-B = -200μA
RSW = 15Ω
-IPEAK
2018 Microchip Technology Inc.
DS20005739A-page 5
MD0105
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
A1
Switch Terminal A1
3
NC
No internal connection
4
A2
Switch Terminal A2
5
NC
No internal connection
6
A3
Switch Terminal A3
7
NC
No internal connection
8
A4
Switch Terminal A4
9
NC
No internal connection
10
NC
No internal connection
11
B4
Switch Terminal B4
12
NC
No internal connection
13
B3
Switch Terminal B3
14
NC
No internal connection
15
B2
Switch Terminal B2
16
NC
No internal connection
17
B1
Switch Terminal B1
18
NC
No internal connection
Center Tab
DS20005739A-page 6
Description
Connect to ground
2018 Microchip Technology Inc.
MD0105
3.0
DETAILED DESCRIPTION
The MD0105 can be considered as a normally closed
switch controlled by a built-in control circuit. (See
Functional Block Diagram.) The switch control circuit
monitors the voltage drop across Terminals A and B. If
the voltage difference is greater than ±2V, 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 Terminal
A and Terminal B drops below ±2V. A pair of
back-to-back diodes, from the receiver side of the
switch to ground is needed to complete the circuit and
allow the peak current (about 60 mA) to flow through
the switch. If the diodes are not present, there is no
current path and the voltage drop across Terminals A
and B becomes less than ±2V. As a result, the switch
remains in the closed position.
3.1
On Resistance
When the voltage across Terminals A and B is below
±2V, the switch is in Receive mode and the RON is
typically 15Ω. Once the voltage across Terminals A and
B is greater than ±2V, the switch is in Transmit mode
and prevents high-voltage pulses from passing through
to the receiver.
3.2
Switch Capacitance
The typical switch-on capacitance, CSW(ON), is 21 pF.
This is measured from Terminal A to Terminal B when
the switch is turned on.
The switch-off capacitance is a function of the voltage
across the T/R switch. The CSW(OFF) is about 12 pF to
19 pF for 10V to 130V of transmit voltage.
3.3
TON and TOFF Time
TON and TOFF of the MD0105 are less than 20 ns,
which provides a quick transition between Transmit
Receive modes. The TON and TOFF are proportional to
the rise and fall times of the transmit pulses.
2018 Microchip Technology Inc.
DS20005739A-page 7
MD0105
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:
DS20005739A-page 8
Example
MD0105
K6
e3 1823
513
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.
2018 Microchip Technology Inc.
MD0105
Note: For the most current package drawings, see the Microchip Packaging Specification at www.microchip.com/packaging.
2018 Microchip Technology Inc.
DS20005739A-page 9
MD0105
NOTES:
DS20005739A-page 10
2018 Microchip Technology Inc.
MD0105
APPENDIX A:
REVISION HISTORY
Revision A (November 2018)
• Converted Supertex Doc# DSFP-MD0105 to
Microchip DS20005739A
• Changed the package marking format
• Changed the quantity of the 18-lead DFN K6
M932 media type from 2500/Reel to 3300/Reel
• Made minor text changes throughout the document
2018 Microchip Technology Inc.
DS20005739A-page 11
MD0105
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:
MD0105
=
4-Channel High-Voltage Protection T/R
Switch
Package:
K6
=
18-lead VDFN
Environmental:
G
=
Lead (Pb)-free/RoHS-compliant Package
Media Type:
(blank)
=
490/Tray for a K6 Package
M932
=
3300/Reel for a K6 Package
DS20005739A-page 12
Examples:
a) MD0105K6-G:
4-Channel High-Voltage
Protection T/R Switch
18-lead VDFN, 490/Tray
b) MD0105K6-G-M932:
4-Channel High-Voltage
Protection T/R Switch
18-lead VDFN, 3300/Reel
2018 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
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
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conveyed, implicitly or otherwise, under any Microchip
intellectual property rights unless otherwise stated.
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© 2018, Microchip Technology Incorporated, All Rights Reserved.
ISBN: 978-1-5224-3904-2
== ISO/TS 16949 ==
2018 Microchip Technology Inc.
DS20005739A-page 13
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DS20005739A-page 14
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08/15/18
