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ADuM4471ARIZ-RL Datasheet(PDF) 1 Page - Analog Devices

Part # ADuM4471ARIZ-RL
Description  Isolated Switching Regulator with Quad-Channel Isolators
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADuM4471ARIZ-RL Datasheet(HTML) 1 Page - Analog Devices

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Isolated Switching Regulator
with Quad-Channel Isolators
Data Sheet
ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM4474
Rev. 0
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2012 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
FEATURES
Isolated PWM feedback with built in compensation
Primary side transformer driver for up to 2.5 W output power
with 5 V input voltage
Regulated adjustable output: 3.3 V to 24 V
Up to 80% efficiency
Quad dc-to-25 Mbps (NRZ) signal isolation channels
200 kHz to 1 MHz adjustable oscillator
Soft start function at power-up
Pulse-by-pulse overcurrent protection
Thermal shutdown
5000 V rms isolation
High common-mode transient immunity: >25 kV/μs
20-lead SOIC package with 8.3 mm creepage
High temperature operation: 105°C
APPLICATIONS
Power supply start-up bias and gate drives
Isolated sensor interfaces
Process controls
RS-232/RS-422/RS-485 transceivers
FUNCTIONAL BLOCK DIAGRAM
ADuM4470/
ADuM4471/
ADuM4472/
ADuM4473/
ADuM4474
PRIMARY
CONTROLLER/
DRIVER
SECONDARY
CONTROLLER
INTERNAL
FEEDBACK
VDD2
OC
FB
VREG
VDD1
VDDA
GND1
GND2
REG
RECT
5V
VISO
CHA
CHB
CHC
CHD
SECONDARY
DATA I/O
4-CHANNEL
PRIMARY
DATA I/O
4-CHANNEL
I/OA
I/OB
I/OC
I/OD
I/OA
I/OB
I/OC
I/OD
Figure 1.
GENERAL DESCRIPTION
The ADuM4470/ADuM4471/ADuM4472/ADuM4473/
ADuM44741 are quad-channel, digital isolators with a regu-
lated dc-to-dc isolated power supply controller and an internal
MOSFET driver. The dc-to-dc controller has an internal isolated
PWM feedback from the secondary side, based on the
iCoupler® chip scale transformer technology and complete loop
compensation. This eliminates the need to use an optocoupler
for feedback and compensates the loop for stability.
The ADuM447x isolators provide a more stable output voltage
and higher efficiency compared to unregulated isolated dc-
to-dc power supplies. The fully integrated feedback and loop
compensation in a wide-body SOIC package provide a smaller
form factor and 8.3 mm creepage distance solution.
The regulated feedback provides a relatively flat efficiency curve
over the full output power range. The ADuM447x enable a dc-
to-dc converter with a 3.3 V to 24 V isolated output voltage
range from either a 5.0 V or a 3.3 V input voltage, with an
output power of up to 2.5 W.
The ADuM447x isolators provide four independent isolation
channels in a variety of channel configurations and data rates.
(The x in ADuM447x throughout this data sheet stands for the
ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM4474.)
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7075 329 B2. Other patents pending.


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