Data Sheet

ADuM4470/ADuM4471/ADuM4472/ADuM4473/ADuM4474

Rev. 0 | Page 17 of 36

X1

1

NC

3

X2

4

20

19

18

FB

17

16

15

14

13

OC

12

11

TOP VIEW

(Not to Scale)

ADuM4472

NOTES

1. THE PIN LABELED NC CAN BE ALLOWED TO FLOAT,

BUT IT IS BETTER TO CONNECT THIS PIN TO GROUND.

AVOID ROUTING HIGH SPEED SIGNALS THROUGH

THESE PINS BECAUSE NOISE COUPLING MAY RESULT.

*PIN 2 AND PIN 10 ARE INTERNALLY CONNECTED,

RECOMMENDED. PIN 11 AND PIN 19 ARE

INTERNALLY CONNECTED, AND CONNECTING

Figure 10. ADuM4472 Pin Configuration

Table 14. ADuM4472 Pin Function Descriptions

Pin No. Mnemonic Description

1

X1

Transformer Driver Output 1.

2, 10

GND

1

Ground Reference for Isolator Primary.

3

NC

This pin is not connected internally (see Figure 10).

4

X2

Transformer Driver Output 2.

5

V

IA

Logic Input A.

6

V

IB

Logic Input B.

7

V

OC

Logic Output C.

8

V

OD

Logic Output D.

9

V

DDA

Primary Supply Voltage 3.0 V to 5.5 V. Connect to V

11, 19

GND

2

Ground Reference for Isolator Side 2.

12

OC

Oscillator Control Pin. When OC = logic high = V

voltage, connect a resistor between the OC pin and GND

to 1 MHz, as programmed by the resistor value.

13

V

ID

Logic Input D.

14

V

IC

Logic Input C.

15

V

OB

Logic Output B.

16

V

OA

Logic Output A.

17

FB

Feedback Input from the Secondary Output Voltage, V

voltage equal to the 1.25 V internal reference level using the V

required even in open-loop mode to provide soft start.

18

V

DD2

Internal Supply Voltage Pin for the Secondary Side. When a sufficient external voltage is supplied to V

regulator regulates the V

capacitor from V

20

V

REG

Input of the Internal Regulator to Power the Secondary Side Controller. V

regulate the V