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
Step 7 Optional: Enable / Disable
The EN pin provides electrical on/off control of the device. Once the EN pin voltage exceeds the threshold voltage, the
device starts operation. If the EN pin voltage is pulled below the threshold voltage, the regulator stops switching and enters
low quiescent current state.
Figure 7 shows the typical application of the enable function. The EN pin has an internal pull-up current source, allowing
the user to float the EN pin for enabling the device. If an application requires controlling the EN pin, use an open
drain/collector device, or a suitable logic gate to interface with the pin.
Turning Q1 on applies a low voltage to the enable (EN) pin and disables the output of the supply shown in Figure 9. If Q1
is turned off, the supply executes a soft-start power-up sequence, as shown in Figure 8. A regulated output voltage is
produced within 5ms.
EN/UVLO
VIN
AGND
R
UVLO1
R
UVLO2
INTSS
26
V
IN
27
29
EN
Control
Q1
Figure 7. Typical Enable/Disable Control
2ms/Div
V
EN
5V/Div
V
SS
1V/Div
V
OUT
2V/Div
100µs/Div
V
EN
5V/Div
V
SS
1V/Div
V
OUT
2V/Div
Figure 8. EN start-up I
OUT
= 2A Figure 9. EN shutdown I
OUT
= 2A