Isolated Switching Regulator with Integrated Feedback Data Sheet ADuM4070 FEATURES FUNCTIONAL BLOCK DIAGRAM V V ISO DD1 Isolated PWM feedback with built-in compensation RECTIFIER Primary side transformer driver for up to 2.5 W output power V X1 X2 REG with 5 V input voltage Regulated adjustable output: 3.3 V to 24 V ADuM4070 Up to 70% efficiency V DD2 200 kHz to 1 MHz adjustable oscillator REGULATOR Soft start function at power-up 5V Pulse-by-pulse overcurrent protection PRIMARY V CONTROLLER/ DDA FB SECONDARY Thermal shutdown DRIVER CONTROLLER OC INTERNAL 5000 V rms isolation FEEDBACK High common-mode transient immunity: >25 kV/s GND GND 16-lead SOIC package with 8.3 mm creepage 1 2 High temperature operation: 105C maximum Figure 1. Safety and regulatory approvals (pending) UL recognition: 5000 V rms for 1 minute per UL 1577 CSA Component Acceptance Notice 5A VDE certificate of conformity DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 V = 849 V peak IORM APPLICATIONS Power supply start-up bias and gate drives Isolated sensor interfaces Process controls GENERAL DESCRIPTION 1 The ADuM4070 is a regulated dc-to-dc isolated power supply The regulated feedback provides a relatively flat efficiency curve controller with an internal MOSFET driver. The dc-to-dc controller over the full output power range. The ADuM4070 enables a dc-to- has internal isolated PWM feedback from the secondary side based 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 on the iCoupler chip scale transformer technology and complete of up to 2.5 W. loop compensation. This architecture eliminates the need to use an optocoupler for feedback and compensates the loop for stability. The ADuM4070 isolator provides 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 solution with a smaller form factor and 8.3 mm creepage distance. 1 Protected by U.S. Patents 5,952,849 6,873,065 and 7,075,329. Other patents pending. Rev. 0 Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 2012 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 10461-001ADuM4070 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Pin Configuration and Function Descriptions ..............................8 Applications ....................................................................................... 1 Typical Performance Characteristics ..............................................9 Functional Block Diagram .............................................................. 1 Applications Information .............................................................. 14 General Description ......................................................................... 1 Application Schematics ............................................................. 14 Revision History ............................................................................... 2 Transformer Design ................................................................... 15 Specifications ..................................................................................... 3 Transformer Turns Ratio ........................................................... 15 Electrical Characteristics5 V Primary Input Supply/ Transformer ET Constant ......................................................... 15 5 V Secondary Isolated Supply ................................................... 3 Transformer Primary Inductance and Resistance ................. 16 Electrical Characteristics3.3 V Primary Input Supply/ Transformer Isolation Voltage .................................................. 16 3.3 V Secondary Isolated Supply ................................................ 3 Switching Frequency .................................................................. 16 Electrical Characteristics5 V Primary Input Supply/ Transient Response .................................................................... 16 3.3 V Secondary Isolated Supply ................................................ 4 Component Selection ................................................................ 16 Electrical Characteristics5 V Primary Input Supply/ 15 V Secondary Isolated Supply ................................................. 4 Printed Circuit Board (PCB) Layout ....................................... 17 Package Characteristics ............................................................... 5 Thermal Analysis ....................................................................... 17 Power Consumption .................................................................. 17 Regulatory Approvals (Pending) ................................................ 5 Insulation and Safety-Related Specifications ............................ 5 Power Considerations ................................................................ 17 DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 Insulation Lifetime ..................................................................... 18 Insulation Characteristics ............................................................ 6 Outline Dimensions ....................................................................... 19 Recommended Operating Conditions ...................................... 6 Ordering Guide .......................................................................... 19 Absolute Maximum Ratings ............................................................ 7 ESD Caution .................................................................................. 7 REVISION HISTORY 10/12Revision 0: Initial Version Rev. 0 Page 2 of 20