WPMDU1251501 / 171021501
MagI³C
Power Module
VDRM
- Variable Step Down Regulator Module
7 - 50V / 2.5A / 2.5 - 15V Output
DESCRIPTION
The VDRM series of the MagI³C Power Module family
provide a fully integrated DC-DC power supply including
the buck switching regulator and inductor in a package.
The WPMDU1251501 offers high efficiency and delivers
up to 2.5A of output current. It operates from 7V input
voltage up to 50V. It is designed for fast transient
response.
It is available in a standard industrial high power density
BQFN-41 (9 x 11 x 2.8mm) package with good thermal
performance.
The VDRM regulators have an on-board protection
circuitry to guard against thermal overstress and electrical
damage featuring thermal shutdown, over-current, short-
circuit, overvoltage and undervoltage protections.
FEATURES
Peak efficiency up to 96%
Current capability up to 2.5A
Wide input voltage range: 7V to 50V
65V transients capability
Output voltage range: 2.5V to 15V
Continuous output power: 37.5W
Integrated shielded inductor solution for quick time to
market and ease of use
Adjustable switching frequency (0.3 to 1MHz)
Current Mode Control
Undervoltage lockout protection (UVLO)
Adjustable soft-start and voltage tracking
Frequency synchronization with external clock
Thermal shutdown and output short circuit protection
Cycle by cycle current limit
Power Good
Operating ambient temperature up to 85°C
Operating junction temp. range: -40 to 105°C
RoHS & REACH compliant
Mold compound UL 94 Class V0 (flammability
testing) certified
Complies with EN 55022 class B radiated and
conducted emissions standard
TYPICAL APPLICATIONS
Point-of-Load DC-DC applications from 12V and 24V
industrial rails
Industrial, Test & Measurement, Medical applications
System power supplies
DSPs, FPGAs, MCUs and MPUs supply
I/O interface power supply
41
N-
QF
B
TYPICAL CIRCUIT DIAGRAM
V
IN
26
35
27
C
IN
31
VIN
PG
VOUT
V
OUT
R
SET
Module
FB
AGND
INTSS
29
SS/TRK
28
36
EN/UVLO
RT/CLK
PGND
C
OUT
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© May 2016
Würth Elektronik eiSos GmbH & Co. KG
- Data Sheet - REV 1.0
1/46
WPMDU1251501 / 171021501
MagI³C
Power Module
VDRM
- Variable Step Down Regulator Module
PACKAGE
27 EN/UVLO
28 SS/TRK
27 EN/UVLO
28 SS/TRK
20 PGND
19 PGND
19 PGND
20 PGND
25 BOOT
25 BOOT
29 INTSS
26 VIN
INTRRT 30
RT/CLK 31
SW
41
PGND
40
18 PGND
17 PGND
16 PGND
15 VOUT
PGND 18
PGND 17
PGND 16
VOUT 15
VOUT 14
VOUT 13
VOUT 12
PGND
40
SW
41
26 VIN
23 SW
22 SW
21 SW
21 SW
24 SW
24 SW
22 SW
23 SW
29 INTSS
30 INTRRT
31 RT/CLK
AGND 32
AGND 33
AGND 34
PG 35
FB 6
AGND
37
Top view
SW
38
Bottom view
AGND
37
32 AGND
33 AGND
34 AGND
35 PG
36 FB
VOUT
39
14 VOUT
13 VOUT
12 VOUT
VOUT
39
SW
38
VOUT 10
VOUT 11
VOUT 11
RSET INT 1
RCCOMP 3
VOUT 10
AGND 5
SW 6
NC 8
NC 9
NC 8
SW 7
SW 6
AGND 5
AGND 4
RCCOMP 3
COMP 2
COMP 2
AGND 4
SW 7
NC 9
PIN DESCRIPTION
SYMBOL
VIN
VOUT
PIN
26
10, 11, 12,
13, 14, 15,
39
16, 17, 18,
19, 20, 40
TYPE
Power
Power
PIN DESCRIPTION
The supply input pin is a terminal for an unregulated input voltage source. It is
required to place the input capacitor nearby the VIN pin and PGND.
The output voltage pins are connected to the internal inductor. Connect external
bypass capacitors between these pins and PGND.
This is the return current path for the power stage of the device. Connect these pins
to the load and to the bypass capacitors associated with VIN and VOUT. Pad 40
should be connected to PCB ground planes using multiple vias for good thermal
performance.
These pins are connected to the internal analog ground (AGND) of the device. This
node should be treated as the zero volt ground reference for the analog control
circuitry. Pad 37 should be connected to PCB ground planes using multiple vias for
good thermal performance. Not all pins are connected together internally. All pins
must be connected together externally with a copper plane. Connect AGND to PGND
at a single point (at the ground terminal of the first output capacitor). See Layout
section for recommendations.
An internal resistor of 10KΩ is connected internally between R
SET INT
and FB. This is
the low side resistor of the feedback voltage divider.
Must be connected to AGND.
Connect a resistor from the last output capacitor terminal to FB to set the output
voltage.
PGND
Power
AGND
4, 5, 32,
33, 34, 37
Supply
RSET INT
1
Analog
FB
36
Input
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© May 2016
Würth Elektronik eiSos GmbH & Co. KG
- Data Sheet - REV 1.0
RSET INT 1
2/46
WPMDU1251501 / 171021501
MagI³C
Power Module
VDRM
- Variable Step Down Regulator Module
PINS FOR OPTIONAL USE
SYMBOL
EN/UVLO
PIN
27
TYPE
Input
PIN DESCRIPTION
Enable and UVLO adjust pin. Use an open drain or open collector logic device to
ground this pin to disable the device. A resistor divider between this pin, AGND, and
VIN sets the UVLO voltage.
This pin sets the switching frequency. Left open will set the internal oscillator to the
default switching frequency. An external resistor from this pin to AGND sets a user
defined switching frequency. This pin can also be used to synchronize with an
external clock.
Internal Resistor (R
RT INT
) which defines the default switching frequency. Must be
connected to AGND.
Soft-start and tracking pin. Connecting an external capacitor to this pin adjusts the
output voltage rise time during start-up. A voltage applied to this pin allows for tracking
and sequencing control.
Internal soft-start or track feature select. Connect this pin to AGND to enable the
internal SS capacitor. Leave this pin open to enable the tracking feature of pin
SS/TRK.
Power Good flag pin. This open drain output asserts low if the output voltage is more
than approximately ±6% out of regulation. A pull-up resistor is required if this function
is used.
RT/CLK
31
Input
INTRRT
30
Analog
SS/TRK
28
Input
INTSS
29
Input
PG
35
Output
AUXILIARY PINS DESCRIPTION
SYMBOL
COMP
RCCOMP
BOOT
SW
NC
PIN
2
3
25
6, 7, 21,
22, 23, 24,
38, 41
8, 9
TYPE
Output
Analog
Supply
Power
PIN DESCRIPTION
Output of the error amplifier. Do Not Connect. This pin must be soldered to an isolated
pad.
Internal R and C of the compensation network. Do Not Connect. This pin must be
soldered to an isolated pad.
Internal bootstrap pin for the high-side MOSFET. Do Not Connect. This pin must be
soldered to an isolated pad.
Switch node. Do not place any external component on these pins or tie them to a pin
of another function.
Not
These pins are not connected to the internal circuitry, and are not connected to each
connect. other.
we-online.com
© May 2016
Würth Elektronik eiSos GmbH & Co. KG
- Data Sheet - REV 1.0
3/46
WPMDU1251501 / 171021501
MagI³C
Power Module
VDRM
- Variable Step Down Regulator Module
ORDERING INFORMATION
ORDER CODE
171021501
178021501
PART DESCRIPTION
WPMDU1251501NT
Evaluation Board
SPECIFICATIONS
2.5A / 37.5W version
2.5A / 37.5W version
PACKAGE
BQFN-41
PACKING UNIT
Tape and Reel with 250 Units
1
PACKAGE SPECIFICATIONS
Weight
0.54g
Molding compound
EME-G770H
UL class
UL94 V-0
Certificate number
E41429
SALES INFORMATION
SALES CONTACTS
Würth Elektronik eiSos GmbH & Co. KG
EMC & Inductive Solutions
Max-Eyth-Str. 1
74638 Waldenburg
Germany
Tel. +49 (0) 79 42 945 - 0
www.we-online.com
powermodules@we-online.com
we-online.com
© May 2016
Würth Elektronik eiSos GmbH & Co. KG
- Data Sheet - REV 1.0
4/46
WPMDU1251501 / 171021501
MagI³C
Power Module
VDRM
- Variable Step Down Regulator Module
ABSOLUTE MAXIMUM RATINGS
Caution:
Exceeding the listed absolute maximum ratings may affect the device negatively and may cause permanent damage.
SYMBOL
VIN
VOUT
AGND
SW
EN/UVLO
FB
PG
SS/TRK
INTSS
RT/CLK
T
storage
T
SOLR
Mechanical
Shock
Mechanical
Vibration
PARAMETER
Input voltage
Output voltage
AGND to PGND
Switching node pin voltage
Switching node pin voltage (10ns transient)
Enable/Undervoltage lockout pin voltage
Enable/Undervoltage lockout pin source current
Output voltage adjust pin voltage
Power good pin voltage
Power good pin sink current
Soft-start/Tracking pin voltage
Soft-start/Tracking pin sink current
Internal soft-start or tracking feature select pin voltage
Timer/Clock pin voltage
Timer/Clock pin source current
Assembled, non operating storage temperature
Peak case/leads temperature during reflow soldering, max. 30sec per
JEDEC J-STD020. Maximum three cycles!
Mil-STD-883D, Method 2002.3, 1msec, ½ sine, mounted
Mil-STD-883D, Method 2007.2, 20-2000Hz
LIMITS
MIN
-0.3
-0.6
-0.2
-0.6
-2
-0.3
-0.3
-0.3
-0.3
-0.3
-0.3
-65
MAX
65
V
IN
2.3
65
65
5
100
3
6
10
3
200
3
3.6
100
150
245 ±5°C
1500
20
UNIT
V
V
V
V
V
V
µA
V
V
mA
V
µA
V
V
µA
°C
°C
G
G
OPERATING CONDITIONS
Operating conditions are conditions under which operation of the device is intended to be functional. All values are referenced
to GND.
SYMBOL
V
IN
V
OUT
f
SW
T
A
T
J
I
OUT
Input voltage
Regulated output voltage
Switching frequency
Ambient temperature range
Junction temperature range
Nominal output current
PARAMETER
MIN
(1)
7
2.5
300
-40
-40
-
-
-
TYP
(2)
-
MAX
(1)
50
15
1000
85
(3)
105
2.5
UNIT
V
V
kHz
°C
°C
A
THERMAL SPECIFICATIONS
SYMBOL
θ
JA
ψ
JT
ψ
JB
T
SD
PARAMETER
Thermal resistance junction to ambient
(4)
Thermal resistance junction to top
(5)
Thermal resistance junction to board
(6)
Thermal shutdown, junction temperature, rising
Thermal shutdown hysteresis, falling
TYP
14
3.3
6.8
180
15
UNIT
°C/W
°C/W
°C/W
°C
°C
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© May 2016
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- Data Sheet - REV 1.0
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