Datasheet

Data Sheet 16 Rev. 1.01, 2009-10-19
IFX27001
Application Information
6 Application Information
Note: The following information is given as a hint for the implementation of the device only and shall not be
regarded as a description or warranty of a certain functionality, condition or quality of the device.
Figure 5 Application Diagram
Application Hints
Adjustable Version
At the fixed voltage IFX27001 devices, the output voltage is divided internally and compared to an internal
reference of 1.25 V typical. The regulation loop controls the output voltage to achieve the output voltage of 5 V,
3.3 V, 2.6 V, 1.8V or 1.5V. The variable version compares the voltage difference between the adjust pin ADJ and
the output pin Q to the internal reference of typically 1.25 V. The output voltage is adjusted by an external voltage
divider between Q, ADJ and GND and calculates:
AES02815
C
I
1
C
I
2
V
I
I
C
Q2
V
Q
Q
ADJ
R
2
C
ADJ
R
1
IFX27001TFV
V
Q
- V
ADJ
= V
REF
32
1
I
ADJ
C
I
1
C
I
2
V
I
C
Q2
V
Q
IFX27001TFV
I
Q
GND
32
1
V
Q
V
REF
1
R
2
R
1
-----+
⎝⎠
⎛⎞
I
ADJ
R
2
×+×=