ADUM3070 AD [Analog Devices], ADUM3070 Datasheet - Page 8

• Manufacturer Part Number: ADUM3070
• Description: Isolated Switching Regulator
• Manufacturer: AD [Analog Devices]

ADuM3070
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
See Application Note
Table 12. Pin Function Descriptions
Pin No.
1
2, 8
3, 11, 12
5, 6
4
7
9, 15
10
13
14
16
Mnemonic Description
X1
GND
NC
TP
X2
V
GND
OC
FB
V
V
DDA
DD2
REG
1
2
AN-1109
Transformer Driver Output 1.
Ground Reference for Primary Side.
No Connect. Do not connect to this pin.
Test Point. Do not connect to this pin.
Transformer Driver Output 2.
Primary Supply Voltage 3.0 V to 5.5 V. Connect to V
Ground Reference for Secondary Side.
Oscillator Control Pin. When OC = logic high = V
output voltage, connect a resistor between the OC pin and GND
frequency of 200 kHz to 1 MHz, as programmed by the resistor value.
Feedback Input from the Secondary Output Voltage V
the V
divider is required even in open-loop mode to provide soft start.
Internal Supply Voltage Pin for the Secondary Side Controller. When a sufficient external voltage is supplied to
V
Connect a 0.1 µF bypass capacitor from V
Input of the Internal Regulator to Power the Secondary Side Controller. V
to regulate the V
REG
, the internal regulator regulates the V
for specific layout guidelines.
FB
voltage equal to the 1.25 V internal reference level using the V
DD2
*GND
*GND
*PIN 2 AND PIN 8 ARE INTERNALLY CONNECTED,
NOTES
1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN.
2. TP = TEST POINT. DO NOT CONNECT TO THIS PIN.
AND CONNECTING BOTH TO GND
RECOMMENDED. PIN 9 AND PIN 15 ARE
INTERNALLY CONNECTED, AND CONNECTING
BOTH TO GND
output to 5.0 V.
V
DDA
NC
X1
X2
TP
TP
1
1
1
2
3
4
5
6
7
8
(Not to Scale)
ADuM3070
TOP VIEW
Figure 3. Pin Configuration
2
IS RECOMMENDED.
Rev. 0 | Page 8 of 20
DD2
16
15
14
13
12
11
10
DD2
9
V
to GND
GND
V
FB
NC
NC
OC
GND
pin to 5.0 V. Otherwise, V
REG
DD2
1
IS
DD2
2
2
*
*
DD1
, the secondary controller runs open-loop. To regulate the
2
.
. Connect a 0.1 µF bypass capacitor from V
ISO
. Use a resistor divider from V
2
, and the secondary controller runs at a
ISO
DD2
= V
REG
should be in the 3.0 V to 5.5 V range.
FB
should be in the 5.5 V to 15 V range
× (R1 + R2)/R2 formula. The resistor
ISO
to the FB pin to make
Data Sheet
DDA
to GND
1
.