Datasheet

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© May 2016
Würth Elektronik eiSos GmbH & Co. KG - Data Sheet - REV 1.0
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WPMDU1251501 / 171021501
MagI³C Power Module
VDRM - Variable Step Down Regulator Module
DESIGN FLOW
The next 10 simple steps will show how to select the external components to design your power application.
Essential Steps
1. Set output voltage
2. Set operating frequency
3. Select input capacitor
4. Select output capacitor
Optional Steps
5. Select soft-start capacitor
6. Select undervoltage lockout divider
7. Enable/Disable
8. Voltage tracking
9. Synchronization to an external clock
10. Power Good
C
IN
EN/UVLO
VIN
RT/CLK
PGND SS/TRK
FB
VOUT
Module
R
SET
C
SS
C
OUT
AGND
26
27
31
28
36
V
IN
V
OUT
INTSS
29
PG
35
R
UVLO1
R
UVLO2
R
RT
10.
1.
8.
3. 4.
6.
5.
2.
7.
9.
Step 1 Setting the output voltage (V
OUT
)
The MagI³C Power Module is designed to provide output voltages from 2.5 V to 15 V. The output voltage is determined by
the value of R
SET
, which must be connected between the V
OUT
node and the FB pin (Pin 36). For output voltages higher
than 5 V, improved operating performance can be obtained by increasing the operating frequency. This adjustment
requires the addition of R
RT
between RT/CLK (Pin 31) and AGND (Pin 30). See the Step 2 Set operating frequency section
for more details. Table 1 gives the standard external R
SET
resistor for a number of common bus voltages and also includes
the recommended R
RT
resistor for output voltages above 5 V.
V
OUT
R
SET
2.5V
21.5kΩ
3.3V
31.6kΩ
5V
52.3kΩ
9V
102kΩ
12V
140kΩ
15V
178kΩ
Table 1: Recommended standard output voltages