Datasheet

WPMDB1400362Q / 171040302
MagI
3
C Power Module
VDRM – Variable Step Down Regulator Module
we-online.com Würth Elektronik eiSos GmbH & Co. KG – Data Sheet Rev. 1.0
© May 2016 3/48
PIN DESCRIPTION
SYMBOL NUMBER TYPE DESCRIPTION
VIN 30,31,32 Power Input Voltage. Place input capacitors as close as possible
VOUT
8,9,10,11,
12,13,14,
38
Power Output voltage. Place output capacitors as close as possible. For thermal
performance use copper plane(s) at these pins.
AGND 33,34 Supply Analog ground for internal circuitry. Connect to power ground
PGND 37 Power
Power ground for the internal switching circuitry. Connect to copper plane(s) with
thermal vias for thermal performance.
VSENSE+ 36 Input
Connect to positive terminal of the output capacitor. An internal resistor of 1430 Ω is
connected internally between V
SENSE+
and FB. This is the upper resistor of the
feedback voltage divider.
FB 35 Input
A resistor (R
SET
) from FB to AGND is needed to select the output voltage. This is
the lower resistor of the feedback voltage divider.
RT/CLK 4 Input
An external resistor from RT/CLK to AGND adjusts the switching frequency of the
device. This pin can also be used to synchronize with an external clock.
INTRRT 5 Analog Internal resistor which defines the default switching frequency.
RCOMP 1 Analog Internal resistor of the compensation network. Must be connected to AGND.
OPTIONAL
SYMBOL NUMBER TYPE DESCRIPTION
UVLO 29 Input
An internal undervoltage lock out resistor of 34kΩ is connected to the enable pin. If
connected to analog ground, the internal UVLO resistor divider will be activated. For
input voltages below 3.3V this pin should be left open and an optional resistor from
enable to analog ground sets the UVLO to values between 2.95 and 3.3 V.
ENABLE 28 Input
Enable pin. Internally pull-up source. Pull to analog ground to disable. Float to
Enable.
PG 27 Output
Open drain output. The PG pin pulls low during thermal shutdown, over-current,
output overvoltage or undervoltage or disabled device. A pull-up resistor is required.
SS/TRK 6 Input
Internal current source. Connect an external capacitor to optionally increase the
soft-start time. A voltage applied to this pin allows tracking and sequencing.
INTSS 7 Analog
An internal 3.3nF capacitor is connected to this pin. If pin 7 is connected to analog
ground, a 1.1ms soft-start time is selected.
AUXILIARY
SYMBOL NUMBER TYPE DESCRIPTION
COMP 3 Output
Output of the error amplifier. If an external compensation is used, pin 1 must be left
open.
CCOMP 2 Analog Internal capacitor of the compensation network. Do not connect.
BOOT 26 Supply Internal bootstrap pin for the high side MOSFET.
SWITCH
17,18,19,
20,21,22,
23,24,25,
39
Power Internal switch node. Do not connect these pins.
NC 15,16 Not connected to internal circuitry.