ADUM4473 Isolated Switch Regulator with Quad-Channel Isolators (1/3 Channel Directionality)

Power supply startup bias and gate drives Isolated sensor interfaces Process controls RS-232/RS-422/RS-485 transceivers

The ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM4474 are quad-channel, digital isolations with a regulated DC/DC isolated power supply controller with an internal MOSFET driver. The DC/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 isolator provides a more stable output voltage and higher efficiency compared to unregulated isolated DC/DC jpower 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 ADuM3070 enables a DC/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)

Applications

Features and Benefits

For 2500 V rms isolation, please visit the ADuM3473 product page
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

Interface & Isolation

isoPower

Data Sheets

Document	note
ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM4474: Isolated Switching Regulator with Quad-Channel Isolators Data Sheet (Rev. 0)	PDF 743 kB

User Guides

Document	note
UG-492: Evaluating the iCoupler ADuM4470, ADuM4471, ADuM4472, ADuM4473, and ADuM4474 Isolated Switching Regulators with Integrated Feedback	PDF 367 kB

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
ADUM4473ARIZ Production	20 ld SOIC (increased Creepage)	OTH 31	-40 to 105C	5.13	4.45	Y
ADUM4473ARIZ-RL Production	20 ld SOIC (increased Creepage)	REEL 1000	-40 to 105C	0	4.45	Y
ADUM4473CRIZ Production	20 ld SOIC (increased Creepage)	OTH 31	-40 to 105C	6.41	5.57	Y
ADUM4473CRIZ-RL Production	20 ld SOIC (increased Creepage)	REEL 1000	-40 to 105C	0	5.57	Y