Isolated Precision Half-Bridge Driver,
4 A Output
ADuM7234
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2010 Analog Devices, Inc. All rights reserved.
FEATURES
Isolated high-side and low-side outputs
Working Voltage
High-side or low-side relative to input: ±350 V peak
High-side/low-side differential: 350 V peak
4 A peak output current
High frequency operation: 1 MHz maximum
High common-mode transient immunity: >25 kV/μs
High temperature operation: 105°C
Narrow body, 16-lead SOIC
Safety and regulatory approvals (pending)
UL recognition
UL 1577 1000 V rms input-to-output withstand voltage
APPLICATIONS
Isolated IGBT/MOSFET gate drives
Plasma displays
Industrial inverters
Switching power supplies
GENERAL DESCRIPTION
The ADuM72341 is an isolated, half-bridge gate driver that
employs the Analog Devices, Inc., iCoupler® technology to
provide independent and isolated high-side and low-side
outputs. Combining high speed CMOS and monolithic
transformer technology, this isolation component provides
outstanding performance characteristics superior to
optocoupler-based solutions.
By avoiding the use of LEDs and photodiodes, this iCoupler
gate drive device is able to provide precision timing characteristics
not possible with optocouplers. Furthermore, the reliability and
performance stability problems associated with optocoupler
LEDs are avoided.
In comparison to gate drivers employing high voltage level
translation methodologies, the ADuM7234 offers the benefit of
true, galvanic isolation between the input and each output and
between each input. Each output may be operated up to ±350 V
peak relative to the input, thereby supporting low-side switching
to negative voltages. The differential voltage between the high
side and low side may be as high as 350 V peak.
As a result, the ADuM7234 provides reliable control over the
switching characteristics of IGBT/MOSFET configurations over
a wide range of positive or negative switching voltages.
FUNCTIONAL BLOCK DIAGRAM
ENCODE DECODE
ENCODE DECODE
ADuM7234
DISABLE
NC
NC
V
DD1
NC
V
DDB
V
OB
GND
B
5
6
7
8
12
11
GND
1
NC
413
V
DD1
GND
A
314
V
IB
V
OA
215
V
IA
V
DDA
116
10
9
07990-001
Figure 1.
1 Protected by U.S. Patents 5,952,849 and 6,291,907.
ADuM7234
Rev. A | Page 2 of 12
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Electrical Characteristics ............................................................. 3
Package Characteristics ............................................................... 4
Insulation and Safety-Related Specifications ............................ 4
Recommended Operating Conditions ...................................... 4
Regulatory Information ................................................................4
Absolute Maximum Ratings ............................................................5
ESD Caution...................................................................................5
Pin Configuration and Function Descriptions ..............................6
Typical Performance Characteristics ..............................................7
Applications Information .................................................................8
Common-Mode Transient Immunity ........................................8
Insulation Lifetime ........................................................................9
Outline Dimensions ....................................................................... 10
Ordering Guide .......................................................................... 10
REVISION HISTORY
1/10—Rev. Sp0 to Rev. A
Changes to Table 1 ............................................................................ 3
1/09—Revision Sp0: Initial Version
ADuM7234
Rev. A | Page 3 of 12
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
All voltages are relative to their respective ground. 4.5 V ≤ VDD1 ≤ 5.5 V, 12 V ≤ VDDA ≤ 18 V, 12 V ≤ VDDB ≤ 18 V. All minimum/maximum
specifications apply over the entire recommended operating range, unless otherwise noted. All typical specifications are at TA = 25°C,
VDD1 = 5 V, VDDA = 15 V, VDDB = 15 V.
Table 1.
Parameter Symbol Min Typ Max Unit Test Conditions
DC SPECIFICATIONS
Input Supply Current, Quiescent IDDI(Q) 1.0 2.2 mA
Output Supply Current A or Output Supply
Current B, Quiescent
IDDA(Q), IDDB(Q) 1.5 3.2 mA
Input Supply Current, 2 Mbps IDDI(2) 1.4 3.0 mA
Output Supply Current A or Output Supply
Current B, 2 Mbps
IDDA(2), IDDB(2) 22 30 mA CL = 1000 pF
Input Currents IIA, IIB, IDISABLE −10 +0.01 +10 μA 0 ≤ VIA, VIB, VDISABLE ≤ VDD1
Logic High Input Threshold VIH 0.7 × VDD1 V
Logic Low Input Threshold VIL 0.3 × VDD1 V
Logic High Output Voltages VOAH,VOBH VDDA − 0.15,
VDDB − 0.15
VDDA, VDDB V IOA, IOB = −20 mA
Logic Low Output Voltages VOAL,VOBL 0.15 V IOA, IOB = 20 mA
Undervoltage Lockout, VDDA or VDDB Supply
Positive-Going Threshold VDDBUV+ 8.0 8.9 9.8
Negative-Going Threshold VDDBUV- 7.4 8.2 9.0
Hysteresis VDDBUVH 0.3 0.7
Output Short-Circuit Pulsed Current1 I
OA(SC), IOB(SC) 2.0 4.0 A
SWITCHING SPECIFICATIONS
Minimum Pulse Width2 PW 100 ns CL = 1000 pF
Maximum Switching Frequency3 2 Mbps CL = 1000 pF
Propagation Delay4 t
PHL, tPLH 130 160 200 ns CL = 1000 pF
Change vs. Temperature 130 ps/°C CL = 1000 pF
Pulse Width Distortion, |tPLH − tPHL| PWD 14 ns CL = 1000 pF
Channel-to-Channel Matching,
Rising or Falling Edges5
11 ns CL = 1000 pF
Channel-to-Channel Matching,
Rising vs. Falling Edges6
25 ns CL = 1000 pF
Part-to-Part Matching, Rising or Falling Edges7 55 ns CL = 1000 pF, input tr = 3 ns
Part-to-Part Matching, Rising vs. Falling Edges8 63 ns CL = 1000 pF, input tr = 3 ns
Output Rise/Fall Time (10% to 90%) tR/tF 8 14 30 ns CL = 1000 pF
1 Short-circuit duration less than 1 second. Average power must conform to the limit shown under the . Absolute Maximum Ratings
2 The minimum pulse width is the shortest pulse width at which the specified timing parameters are guaranteed.
3 The maximum switching frequency is the maximum signal frequency at which the specified timing parameters are guaranteed.
4 tPHL propagation delay is measured from the 50% level of the falling edge of the VIx signal to the 50% level of the falling edge of the VOx signal. tPLH propagation delay is
measured from the 50% level of the rising edge of the VIx signal to the 50% level of the rising edge of the VOx signal.
5 Channel-to-channel matching, rising, or falling edges, is the magnitude of the propagation delay difference between two channels of the same part when the inputs
are either both rising or falling edges. The supply voltages and the loads on each channel are equal.
6 Channel-to-channel matching, rising vs. falling edges is the magnitude of the propagation delay difference between two channels of the same part when one input is
a rising edge and the other input is a falling edge. The supply voltages and loads on each channel are equal.
7 Part-to-part matching, rising or falling edges, is the magnitude of the propagation delay difference between the same channels of two different parts when the inputs
are either both rising or falling edges. The supply voltages, temperatures, and loads of each part are equal.
8 Part-to-part matching, rising vs. falling edges, is the magnitude of the propagation delay difference between the same channels of two different parts when one input
is a rising edge and the other input is a falling edge. The supply voltages, temperatures, and loads of each part are equal.
ADuM7234
Rev. A | Page 4 of 12
PACKAGE CHARACTERISTICS
Table 2.
Parameter Symbol Min Typ Max Unit Test Conditions
Resistance (Input-to-Output)1 R
I-O 1012 Ω
Capacitance (Input-to-Output)1 C
I-O 2.0 pF f = 1 MHz
Input Capacitance CI 4.0 pF
IC Junction-to-Ambient Thermal Resistance θJA 76 °C/W
1 The device is considered a 2-terminal device: Pin 1 through Pin 8 are shorted together, and Pin 9 through Pin 16 are shorted together.
INSULATION AND SAFETY-RELATED SPECIFICATIONS
Table 3.
Parameter Symbol Value Unit Conditions
Rated Dielectric Insulation Voltage 1000 V rms 1 minute duration
Minimum External Air Gap (Clearance) L(I01) 4.0 min mm Measured from input terminals to output terminals,
shortest distance through air
Minimum External Tracking (Creepage) L(I02) 4.0 min mm Measured from input terminals to output terminals,
shortest distance path along body
Minimum Internal Gap (Internal Clearance) 0.025 min mm Insulation distance through insulation
Tracking Resistance (Comparative Tracking Index) CTI >600 V DIN IEC 112/VDE 0303 Part 1
Isolation Group I Material Group (DIN VDE 0110, 1/89, Table 1)
Maximum Working Voltage Compatible with
50 Years Service Life
VIORM 354 V peak
Continuous peak voltage across the isolation
barrier
RECOMMENDED OPERATING CONDITIONS
Table 4.
Parameter Symbol Min Max Unit
Operating Temperature TA −40 +105 °C
Input Supply Voltage1 V
DD1 4.5 5.5 V
Output Supply Voltages1 V
DDA, VDDB 12 18 V
Input Signal Rise and Fall Times 100 ns
Common-Mode Transient Immunity, Input-to-Output2 −35 +35 kV/μs
Common-Mode Transient Immunity, Between Outputs2 −35 +35 kV/μs
Transient Immunity, Supply Voltages2 −35 +35 kV/μs
1 All voltages are relative to their respective ground.
2 See the Common-Mode Transient Immunity section for additional data.
REGULATORY INFORMATION
The ADuM7234 is approved by the organization listed in Table 5.
Table 5.
UL (Pending)
Recognized under 1577 component recognition program1
Single/basic insulation, 1000 V rms isolation voltage
File E214100
1 In accordance with UL 1577, each ADuM7234 is proof tested by applying an insulation test voltage of 1200 V rms for 1 sec (current leakage detection limit = 5 μA).
ADuM7234
Rev. A | Page 5 of 12
ABSOLUTE MAXIMUM RATINGS
Table 6.
Parameter Rating
Storage Temperature (TST) −55°C to +150°C
Ambient Operating Temperature (TA) −40°C to +105°C
Input Supply Voltage (VDD1)1 −0.5 V to +7.0 V
Output Supply Voltage1 (VDDA, VDDB) −0.5 V to +27 V
Input Voltage1 (VIA, VIB) −0.5 V to VDDI + 0.5 V
Output Voltage1
VOA −0.5 V to VDDA + 0.5 V
VOB −0.5 V to VDDB + 0.5 V
Input-to-Output Voltage2 −350 V peak to +350 V peak
Output Differential Voltage3 350 V peak
Output DC Current (IOA, IOB) −800 mA to +800 mA
Common-Mode Transients4 −100 kV/μs to +100 kV/μs
1 All voltages are relative to their respective ground.
2 Input-to-output voltage is defined as GNDA − GND1 or GNDB − GND1.
3 Output differential voltage is defined as GNDA − GNDB.
4 Refers to common-mode transients across any insulation barrier.
Common-mode transients exceeding the absolute maximum ratings
may cause latch-up or permanent damage.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; Functional operation of the device at these or any
other conditions above those listed in the operational sections
of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Ambient temperature = 25°C, unless otherwise noted.
ESD CAUTION
ADuM7234
Rev. A | Page 6 of 12
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
NC = NO CONNECT
ADuM7234
TOP VIEW
(Not to Scale)
NC
1
V
IA 2
V
IB 3
V
DD1 4
V
DDA
16
V
OA
15
GND
A
14
NC
13
GND
15
NC
12
DISABLE
6
V
DDB
11
V
DD1 7
V
OB
10
NC
8
GND
B
9
07990-002
Figure 2. Pin Configuration
Table 7. ADuM7234 Pin Function Descriptions
Pin No. Mnemonic Description
1, 8, 12 13 NC No Connect. Pin 12 and Pin 13 are floating and should be left unconnected.
2 VIA Logic Input A.
3 VIB Logic Input B.
4, 7 VDD1 Input Supply Voltage, 4.5 V to 5.5 V. Pin 4 and Pin 7 are internally connected. Connecting both pins to VDD1 is
recommended.
5 GND1 Ground Reference for Input Logic Signals.
6 DISABLE Input Disable. Disables the isolator inputs and refresh circuits. Outputs take on the default low state.
9 GNDB Ground Reference for Output B.
10 VOB Output B.
11 VDDB Output B Supply Voltage, 12 V to 18 V.
14 GNDA Ground Reference for Output A.
15 VOA Output A.
16 VDDA Output A Supply Voltage, 12 V to 18 V.
Table 8. Truth Table (Positive Logic)
VIA/VIB Input VDD1 State DISABLE VOA/VOB Output Notes
H Powered L H
L Powered L L
X Unpowered X L Output returns to the input state within 1 μs of VDD1 power restoration.
X Powered H L
ADuM7234
Rev. A | Page 7 of 12
TYPICAL PERFORMANCE CHARACTERISTICS
1.2
1.0
0.8
0.6
0.4
0.2
0
0 0.5 1.0 1.5 2.0
DATA RATE (Mbps)
INPUT CURRENT (mA)
07990-012
Figure 3. Typical Input Supply Current Variation with Data Rate
25
20
15
10
5
0
0 0.5 1.0 1.5 2.0
DATA RATE (Mbps)
OUTPUT CURRENT (mA)
07990-013
Figure 4. Typical Output Supply Current Variation with Data Rate
160
155
150
145
140
–40 –20 0 20406080100120
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
07990-014
Figure 5. Typical Propagation Delay Variation with Temperature
166
164
162
160
158
156
154
152
4.5 5.0 5.5
INPUT SUPPLY VOLTAGE (V)
PROPAGATION DELAY (ns)
07990-015
CHANNEL A FALL CHANNEL B FALL
CHANNEL A RISE
CHANNEL B RISE
Figure 6. Typical Propagation Delay Variation with Input Supply Voltage
(Output Supply Voltage = 15.0 V)
166
164
162
160
158
156
154
152
12 15 18
OUTPUT SUPPLY VOLTAGE (V)
PROPAGATION DELAY (ns)
07990-016
CHANNEL B FALL
CHANNEL A RISE
CHANNEL B RISE
CHANNEL A FALL
Figure 7. Typical Propagation Delay Variation with Output Supply Voltage
(Input Supply Voltage = 5.0 V)
ADuM7234
Rev. A | Page 8 of 12
APPLICATIONS INFORMATION
COMMON-MODE TRANSIENT IMMUNITY
In general, common-mode transients consist of linear and
sinusoidal components. The linear component of a common-
mode transient is given by
VCM, linear = (ΔV/Δt)t
where ΔV/Δt is the slope of the transient shown in Figure 11
and Figure 12.
The transient of the linear component is given by
dVCM/dt = ΔV/Δt
Figure 8 characterizes the ability of the ADuM7234 to operate
correctly in the presence of linear transients. The data, based on
design simulation, is the maximum linear transient magnitude
that the ADuM7234 can tolerate without an operational error.
This data shows a correlation with the data that is listed in
Table 4, which is based on measured data.
TEMPERATURE (°C)
100–40 0 40 80–20 20 60
TRANSIENT IMMUNITY (kV/µs)
50
45
35
40
30
25
20
15
10
5
0
07990-003
BEST-CASE PROCESS VARIATION
WORST-CASE PROCESS VARIATION
Figure 8. Transient Immunity (Linear Transients) vs. Temperature
The sinusoidal component (at a given frequency) is given by
VCM, sinusoidal = V0sin(2πft)
where:
V0 is the magnitude of the sinusoidal.
f is the frequency of the sinusoidal.
The transient magnitude of the sinusoidal component is given by
dVCM/dt = 2πf V0
Figure 9 and Figure 10 characterize the ability of the ADuM7234
to operate correctly in the presence of sinusoidal transients.
The data is based on design simulation and is the maximum
sinusoidal transient magnitude (2πf V0) that the ADuM7234
can tolerate without an operational error. Values for immunity
against sinusoidal transients are not included in Tabl e 4 because
measurements to obtain such values have not been possible.
FREQUENCY (MHz)
20000 500 1000 1500 1750250 750 1250
TRANSIENT IMMUNITY (kV/µs)
250
200
150
100
50
0
07990-004
BEST-CASE PROCESS VARIATION
WORST-CASE PROCESS VARIATION
Figure 9. Transient Immunity (Sinusoidal Transients),
27°C Ambient Temperature
FREQUENCY (MHz)
20000 500 1000 1500 1750250 750 1250
TRANSIENT IMMUNITY (kV/µs)
250
100
150
200
50
0
07990-005
BEST-CASE PROCESS VARIATION
WORST-CASE PROCESS VARIATION
Figure 10. Transient Immunity (Sinusoidal Transients),
100°C Ambient Temperature
ADuM7234
Rev. A | Page 9 of 12
GND
1
V
DD1
ΔV
Δt
ΔV
Δt
5V
GND
1
V
DD1
15V
15V
GND
A
AND GND
B
V
DDA
AND V
DDB
5V
GND
A
AND GND
B
V
DDA
AND V
DDB
15V
15V
07990-006
Figure 11. Common-Mode Transient Immunity Waveforms, Input to Output
GND
A
/GND
B
V
DDB
/V
DDA
ΔV
Δt
ΔV
Δt
15V
GND
A
/GND
B
V
DDA
/V
DDB
15V
15V
GND
A
/GND
B
V
DDA
/V
DDB
15V
GND
B
/GND
A
V
DDB
/V
DDA
15V
15V
07990-007
Figure 12. Common-Mode Transient Immunity Waveforms,
Between Outputs
GNDA/GNDB
V
DDA/VDDB
V
DDA
/V
DDB
GNDA/GNDB
ΔVDD
Δt
07990-008
Figure 13. Transient Immunity Waveforms, Output Supplies
INSULATION LIFETIME
All insulation structures eventually break down when subjected to
voltage stress over a sufficiently long period. The rate of insulation
degradation depends on the characteristics of the voltage waveform
applied across the insulation. In addition to the testing performed
by the regulatory agencies, Analog Devices conducts an extensive
set of evaluations to determine the lifetime of the insulation struc-
ture within the ADuM7234.
Analog Devices performs accelerated life testing using voltage
levels higher than the rated continuous working voltage. Acce-
leration factors for several operating conditions are determined.
These factors allow calculation of the time to failure at the
actual working voltage. Table 3 lists the peak voltage for 50
years of service life for a bipolar ac operating condition and the
maximum Analog Devices recommended working voltage. In
many cases, the approved working voltage is higher than the 50-
year service life voltage. Operation at these high working
voltages can lead to shortened insulation life in some cases.
The insulation lifetime of the ADuM7234 depends on the
voltage waveform type imposed across the isolation barrier.
The iCoupler insulation structure degrades at different rates
depending on whether the waveform is bipolar ac, unipolar
ac, or dc. Figure 14, Figure 15, and Figure 16 illustrate these
different isolation voltage waveforms.
Bipolar ac voltage is the most stringent environment. The goal
of a 50-year operating lifetime under the ac bipolar condition
determines the maximum working voltage recommended by
Analog Devices.
In the case of unipolar ac or dc voltage, the stress on the insu-
lation is significantly lower. This allows operation at higher
working voltages while still achieving a 50-year service life.
The working voltage listed in Table 3 can be applied while
maintaining the 50-year minimum lifetime provided the voltage
conforms to either the unipolar ac or dc voltage cases. Any cross
insulation voltage waveform that does not conform to Figure 15
or Figure 16 should be treated as a bipolar ac waveform, and its
peak voltage should be limited to the 50-year lifetime voltage
value listed in Table 3. Note that the voltage presented in Figure 15
is shown as sinusoidal for illustration purposes only. It is meant
to represent any voltage waveform varying between 0 V and
some limiting value. The limiting value can be positive or
negative, but the voltage cannot cross 0 V.
0V
RATED PEAK VOLTAGE
07990-009
Figure 14. Bipolar AC Waveform
0V
RATED PEAK VOLTAGE
07990-010
Figure 15. Unipolar AC Waveform
0V
RATED PEAK VOLTAGE
07990-011
Figure 16. DC Waveform
ADuM7234
Rev. A | Page 10 of 12
OUTLINE DIMENSIONS
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
COMPLIANT TO JEDEC STANDARDS MS-012-AC
10.00 (0.3937)
9.80 (0.3858)
16 9
8
1
6.20 (0.2441)
5.80 (0.2283)
4.00 (0.1575)
3.80 (0.1496)
1.27 (0.0500)
BSC
SEATING
PLANE
0.25 (0.0098)
0.10 (0.0039)
0.51 (0.0201)
0.31 (0.0122)
1.75 (0.0689)
1.35 (0.0531)
0.50 (0.0197)
0.25 (0.0098)
1.27 (0.0500)
0.40 (0.0157)
0.25 (0.0098)
0.17 (0.0067)
COPLANARITY
0.10
8°
0°
060606-A
45°
Figure 17. 16-Lead Standard Small Outline Package [SOIC_N]
Narrow Body (R-16)
Dimensions shown in millimeters and (inches)
ORDERING GUIDE
Model1
No. of
Channels
Output Peak
Current (A)
Output
Voltage (V) Temperature Range Package Description
Package
Option
ADuM7234BRZ 2 4 15 −40°C to +105°C 16-Lead SOIC_N R-16
ADuM7234BRZ-RL7 2 4 15 −40°C to +105°C 16-Lead SOIC_N, 7-Inch Tape
and Reel Option (1,000 Units)
R-16
1 Z = RoHS Compliant Part.
ADuM7234
Rev. A | Page 11 of 12
NOTES
ADuM7234
Rev. A | Page 12 of 12
NOTES
©2010 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D07990-0-1/10(A)
