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DS4412
Dual-Channel, I2C Adjustable
Sink/Source Current DAC
_______________________________________________________________________________________
9
Applications Information
Example Calculation
for an Adjustable Power Supply
In this example, the Typical Operating Circuit is used
as a base to create Figure 3, a 2.0V voltage supply with
±20% margin. The adjustable power supply has a
DC-DC converter output voltage, VOUT, of 2.0V and a
DC-DC converter feedback voltage, VFB, of 0.8V. To
determine the relationship of R0A and R0B, we start with
the equation:
Substituting VFB = 0.8V and VOUT = 2.0V, the relation-
ship between R0A and R0B is determined to be:
R0A = 1.5 x R0B
IOUT0 is chosen to be 1mA (midrange source/sink cur-
rent for the DS4412). Summing the currents into the
feedback node, we have the following
Where:
And
To create a 20% margin in the supply voltage, the value
of VOUT is set to 2.4V. With these values in place, R0B is
calculated to be 267
Ω, and R0A is calculated to be 400Ω.
The current DAC in this configuration allows the output
voltage to be moved linearly from 1.6V to 2.4V using 15
settings. This corresponds to a resolution of 25.8mV/step.
VCC Decoupling
To achieve the best results when using the DS4412,
decouple the power supply with a 0.01F or 0.1F
capacitor. Use a high-quality ceramic surface-mount
capacitor if possible. Surface-mount components mini-
mize lead inductance, which improves performance,
and ceramic capacitors tend to have adequate high-
frequency response for decoupling applications.
I
VV
R
RA
OUT
FB
A
0
=
I
V
R
RB
FB
B
0
=
II
I
OUT
R B
R A
00
0
=
V
R
RR
V
FB
B
AB
OUT
=
+
×
0
00
DC-DC
CONVERTER
FB
OUT
SDA
SCL
OUT0
GND
RFS0 = 4.612k
Ω
4.7k
Ω
4.7k
Ω
VCC
VOUT = 2.0V
FS0
R0B = 267
Ω
R0A = 400
Ω
VFB = 0.8V
IR0A
IR0B
IOUT0
DS4412
Figure 3. Example Application Circuit
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
8 SOP
U8+1
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
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