MPM3550E
36V, 5A, High-Efficiency, Fast Transient,
Non-Isolated, DC/DC Power Module
with Integrated Inductor
DESCRIPTION
FEATURES
The MPM3550E is a high-density, non-isolated,
DC/DC power module for space-sensitive
applications. The module offers a very compact
solution that achieves 5A of continuous output
current with fast transient and good stability over
a wide input supply and load range. The
MPM3550E can provide an adjustable output
voltage from 1.0 - 12.0V via an external FB
resistor (default 3.3V output). Ultra-high
efficiency is achieved through the use of
synchronous rectification and control techniques.
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The MPM3550E offers standard features,
including an internal fixed soft start, remote
enable control, and power good indicator. The
MPM3550E has fully integrated protection
features, including over-current protection
(OCP), short-circuit protection (SCP), output
under-voltage protection (UVP), input undervoltage lockout (UVLO), and thermal shutdown.
The MPM3550E integrates a switching controller,
power switches, inductors, a modest amount of
input and output capacitors, and all support
components
in
an
advanced
12mmx12mmx3.82mm
package.
The
MPM3550E only requires a minimal number of
standard external components. This compact
solution helps system design and productivity
significantly by offering greatly simplified board
design, layout, and manufacturing requirements.
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Integrated Inductor, Switches, Controller
High-Efficiency Synchronous Mode Control
Low Component Count and Small Size
Ease of Design and Fastest Time to Market
Wide 4.5V to 36V Operating Input Range
Output Adjustable from 1.0V to 12.0V
Guaranteed 5A Continuous Output Current
Ultra-Fast Transient Response
Internal Fixed Soft-Start Time
External Frequency Selection Pin
Power Good (PGOOD) Indicator
Non-Latch OCP, SCP, UVP, and UVLO
Thermal Shutdown Protection
Remote Enable Control (EN)
Available in an LGA-18
(12mmx12mmx3.82mm) Package
Weight: 1.4g
Operating Temperature: -40°C to +125°C
CISPR25 Class 5 Compliant
APPLICATIONS
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Automotive Systems
Industrial Supplies
Telecom and Networking Systems
Distributed Power and POL Systems
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For
MPS green status, please visit MPS website under Quality Assurance. “MPS” and
“The Future of Analog IC Technology” are registered trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
VIN
4.5~36VDC
VIN
RFREQ
RFREQ
PGOOD
PGOOD
EN
VOUT
MPM3550E
EN
FB
GND
COUT
VOUT
3.3V
FB
GND
MPM3550E Rev. 1.1
MonolithicPower.com
4/22/2022
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2022 MPS. All Rights Reserved.
1
MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
ORDERING INFORMATION
Part Number*
MPM3550EGLE
Package
LGA-18 (12mmx12mmx3.82mm)
Top Marking
See Below
MSL Rating
3
TOP MARKING
MPS: MPS prefix
YY: Year code
WW: Week code
MPM3550E: First eight digits of the part number
LLLLLLLLL: Lot number
PACKAGE REFERENCE
TOP VIEW
TOP VIEW
EN
RFREQ
PGOOD
FB
1
9
18
10
17
2
11
16
12
15
13
14
3
4
9-18 GND
8
VIN
7
GND
6
GND
5
VOUT
LGA-18 (12mmx12mmx3.82mm)
MPM3550E Rev. 1.1
MonolithicPower.com
4/22/2022
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© 2022 MPS. All Rights Reserved.
2
MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
θJA
θJC
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (4)
VIN .................................................-0.3V to +40V
VOUT ...............................................-0.3V to +14V
All other pins ................................-0.3V to +6.0V
Continuous power dissipation (TA = 25°C) (2)
LGA-18 (12mmx12mm) ............................. 2.6W
Junction temperature ................................150°C
Lead temperature......................................260°C
Storage temperature .................. -65°C to 150°C
LGA-18 (12xmm12mmx3.82mm)……………….
............................................... 48 ...... 18 .... °C/W
Recommended Operating Conditions (3)
Continuous supply voltage (VIN) ....... 4.5V to 36V
Output voltage (VOUT) .................... 1.0V to 12.0V
Operating temperature (TO). .... -40°C to +125°C
Notes:
1) Absolute maximum ratings are rated under room temperature
unless otherwise noted. Exceeding these ratings may
damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation produces an excessive die temperature, causing
the module to go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on a 4-layer PCB (63.5mmx63.5mm).
θJA: thermal resistance from the junction-to-ambient. This is
the natural convection junction-to-ambient air thermal
resistance measured in a one cubic foot sealed enclosure.
θJC: thermal resistance from junction to the metal lid of the
module. This is the junction-to-board thermal resistance with
all of the component power dissipation flowing through the
entire package.
MPM3550E Rev. 1.1
MonolithicPower.com
4/22/2022
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© 2022 MPS. All Rights Reserved.
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MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
ELECTRICAL CHARACTERISTICS
VIN = 24V, external COUT = 22μF, TJ = -40°C to +125°C, unless otherwise noted.
Parameters
Symbol
Input Voltage and Current
Input DC voltage
VIN
(5)
Maximum input current
IIN-MAX
Input current (shutdown)
IIN
Input current (quiescent)
IIN
Input Under-Voltage Lockout (UVLO)
VIN UVLO rising threshold
VIN UVLO falling threshold
Output Voltage and Current
Output voltage range
VOUT
Output voltage precision
Output regulation (5)
VOUT
VOUT
Output ripple (VOUT = 3.3V) (5)
VOUT (AC)
Output ripple (VOUT = 5V) (5)
VOUT (AC)
Condition
Rise time
tDELAY
tRISE
Typ
4.5
Via an external FB resistor
Output
Overall supply
3.3V
voltage and
temperature range,
Output
IOUT = 0.5A to 5A
5V
Load regulation (VOUT = 3.3V,
IOUT = 0.5A to 5A), TA = 25°C
VIN = 12V, IOUT = 5A, TA = 25°C
VIN = 24V, IOUT = 5A, TA = 25°C
VIN = 12V, IOUT = 5A, TA = 25°C
VIN = 24V, IOUT = 5A, TA = 25°C
Units
36
2
1.6
70
500
1000
3.6
2.7
4.0
3.1
4.4
3.5
V
V
1.0
3.3
12.0
V
-2.0
2.0
%
-2.0
2.0
%
-2.0
2.0
%
17
22
13
18
25
30
25
30
5
mV
mV
mV
mV
A
0.75
1.1
ms
3.8
5
ms
0
IOUT = 0A, from EN high to 10%
of the rated VOUT
IOUT = 0A, from 10% to 90% of
the rated VOUT
Max
V
A
µA
μA
IOUT = 5A, VOUT = 3.3V
VEN = 0V
Enabled, no load, VOUT = 3.3V
Output current
IOUT
Output Turn-On Delay and Rise Time
Turn-on delay time
Min
2.6
Efficiency
VIN = 12V, IOUT = 2.5A, TA = 25°C
VIN = 24V, IOUT = 2.5A, TA = 25°C
VIN = 12V, IOUT = 2.5A, TA = 25°C
Efficiency (VOUT = 5V) (5)
η
VIN = 24V, IOUT = 2.5A, TA = 25°C
Transient Load Response (Load: 50% to 100% to 50% of Full Load, dIOUT/dt = 1A/μs)
VOUT = 3.3V, TA = 25°C
VPK-PK
VOUT = 5V, TA = 25°C
Transient load response (5)
VOUT = 3.3V, TA = 25°C
tRECOVERY
VOUT = 5V, TA = 25°C
Frequency
VOUT = 5V, TA = 25°C,
Switching frequency (5)
fSW
457
RFREQ = 100kΩ
Efficiency (VOUT = 3.3V) (5)
η
92.9
90.0
94.6
91.7
%
%
%
%
100
105
25
30
mV
mV
µs
µs
507
MPM3550E Rev. 1.1
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4/22/2022
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© 2022 MPS. All Rights Reserved.
557
kHz
4
MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
ELECTRICAL CHARACTERISTICS (continued)
VIN = 24V, external COUT = 22μF, TJ = -40°C to +125°C, unless otherwise noted.
Parameters
Enable (EN) (Active High)
EN input rising threshold
EN input falling threshold
EN threshold hysteresis
Power Good (PGOOD)
PGOOD rising threshold
PGOOD falling threshold
PGOOD deglitch time
PGOOD default voltage
Symbol
Condition
Min
Typ
Max
Units
VEN-RISING
VEN-FALLING
VEN-HYS
1.05
0.7
1.25
0.86
400
1.45
1.02
V
V
mV
PGVth-Rising
PGVth-Falling
tPGOOD
VPGOOD
89%
81%
600
4.3
92%
84%
800
4.5
95%
87%
1000
5.2
VFB-REF
VFB-REF
µs
V
Thermal Protection
Thermal shutdown (5)
Thermal shutdown hysteresis
(5)
TSD
175
°C
TSD-HYS
45
°C
NOTE:
5) Derived from bench characterization, not tested in production.
MPM3550E Rev. 1.1
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4/22/2022
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© 2022 MPS. All Rights Reserved.
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MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 24V, VOUT = 3.3V, external COUT = 3 x 22μF, TA = 25°C, unless otherwise noted.
Output Current vs. Efficiency
3
2
70
1.5
60
1
Eff,Vin = 24V,Vo = 1V
Eff,Vin = 5V,Vo = 1V
Eff,Vin = 36V,Vo = 1V
Ploss,Vin=24V,Vo=1V
Ploss,Vin=5V,Vo=1V
Ploss,Vin=36V,Vo=1V
50
40
EFFICIENCY (%)
80
0.5
2.5
90
2
85
80
1.5
75
Eff,Vin = 24V,Vo = 3.3V
Eff,Vin = 5V,Vo = 3.3V
Eff,Vin = 36V,Vo = 3.3V
Ploss,Vin=24V,Vo=3.3V
Ploss,Vin=5V,Vo=3.3V
Ploss,Vin=36V,Vo=3.3V
70
65
30
0
0
3
95
2.5
PLOSS (W)
EFFICIENCY (%)
90
100
60
2
4
OUTPUT CURRENT (A)
2.5
90
2
85
1.5
80
1
75
0.5
70
0
0
2
4
OUTPUT CURRENT (A)
LOAD REGULATION (%)
3
PLOSS (W)
EFFICIENCY(%)
95
2
4
OUTPUT CURRENT (A)
Output Current vs. Load Regulation
3.5
Eff,Vin = 24V,Vo = 5V
Eff,Vin = 36V,Vo = 5V
Ploss,Vin=24V,Vo=5V
Ploss,Vin=36V,Vo=5V
0.5
0
0
Output Current vs. Efficiency
100
1
PLOSS (W)
100
Output Current vs. Efficiency
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
-1.2
-1.4
-1.6
Vin = 24V,Vo = 3.3V
Vin = 5V,Vo = 3.3V
Vin = 36V,Vo = 3.3V
0
1
2
3
4
5
OUTPUT CURRENT (A)
Input Voltage vs. Line Regulation
Conducted EMI
80
No i s e Le ve l[ dB u V / m]
LINE REGULATION (%)
0.5
0
-0.5
-1
Vo = 3.3V,Io = 0.1A
-1.5
Vo = 3.3V,Io = 2.5A
-2
Vo = 3.3V,Io = 5A
70
60
50
40
30
20
10
0
-2.5
5
10
15
20
25
30
INPUT VOLTAGE (V)
35
40
0.1
1
10
Frequency[MHz]
100
MPM3550E Rev. 1.1
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1000
6
MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 24V, VOUT = 3.3V, external COUT = 3 x 22μF, TA = 25°C, unless otherwise noted.
Output Current vs. TRISE
Radiated: EMI
CASETEMPERATURE RISE
(°C)
70
Vo = 1V
Vo = 3.3V
Vo = 5V
60
50
40
30
20
10
1
1.5
2
2.5
3
3.5
4
OUTPUT CURRENT (A)
4.5
5
Thermal Derating
VIN = 24V, VOUT = 1V/3.3V/5V
LOAD CURRENT (A)
6
5
4
3
Vin=24V,Vo=1V
2
Vin=24V,Vo=3.3V
1
Vin=24V,Vo=5V
0
-40
-20
0
20
40
60
80
AMBIENT TEMPERATURE (°C)
100
MPM3550E Rev. 1.1
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MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 24V, VOUT = 3.3V, External COUT = 3 x 22μF, TA = 25°C, unless otherwise noted.
VIN Start-Up
VIN Start-Up
VIN = 24V, VOUT = 3.3V, IOUT = 0A
VIN = 24V, VOUT = 3.3V, IOUT = 5A
CH1: VOUT
2V/div.
CH1: VOUT
2V/div.
CH2: VIN
20V/div.
CH2: VIN
20V/div.
CH3: VPG
5V/div.
CH3: VPG
5V/div.
CH4: IO
5A/div.
CH4: IO
5A/div.
2ms/div.
2ms/div.
VIN Shutdown
VIN Shutdown
VIN = 24V, VOUT = 3.3V, IOUT = 0A
VIN = 24V, VOUT = 3.3V, IOUT = 5A
CH1: VOUT
2V/div.
CH1: VOUT
2V/div.
CH2: VIN
10V/div.
CH2: VIN
20V/div.
CH3: VPG
5V/div.
CH3: VPG
5V/div.
CH4: IO
5A/div.
CH4: IO
5A/div.
20ms/div.
200µs/div.
EN Start-Up
EN Start-Up
VIN = 24V, VOUT = 3.3V, IOUT = 0A
VIN = 24V, VOUT = 3.3V, IOUT = 5A
CH1: VOUT
2V/div.
CH2:EN
5V/div.
CH1: VOUT
2V/div.
CH2:EN
5V/div.
CH3: VPG
5V/div.
CH3: VPG
5V/div.
CH4: IO
5A/div.
CH4: IO
5A/div.
4ms/div.
4ms/div.
MPM3550E Rev. 1.1
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MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 24V, VOUT = 3.3V, external COUT = 3 x 22μF, TA = 25°C, unless otherwise noted.
EN Shutdown
EN Shutdown
VIN = 24V, VOUT = 3.3V, IOUT = 0A
VIN = 24V, VOUT = 3.3V, IOUT = 5A
CH1: VOUT
2V/div.
CH2: EN
5V/div.
CH1: VOUT
2V/div.
CH2: EN
5V/div.
CH3: VPG
5V/div.
CH3: VPG
5V/div.
CH4: IO
5A/div.
CH4: IO
5A/div.
200ms/div.
40µs/div.
Steady State
Steady State
VIN = 24V, VOUT = 3.3V, IOUT = 0A
VIN = 24V, VOUT = 3.3V, IOUT = 5A
CH1:
VOUT/AC
50mV/div.
CH2: VIN
20V/div.
CH1: VOUT/AC
50mV/div.
CH2: VIN
20V/div.
CH4: IO
5A/div.
CH4: IO
5A/div.
10ms/div.
2µs/div.
SCP Entry
SCP Entry
VIN = 24V, VOUT = 3.3V, IOUT = 0A
VIN = 24V, VOUT = 3.3V, IOUT = 5A
CH1: VOUT
5V/div.
CH1: VOUT
5V/div.
CH2: VIN
20V/div.
CH2: VIN
20V/div.
CH3: VPG
5V/div.
CH3: VPG
5V/div.
CH4: IO
5A/div
CH4: IO
5A/div
20ms/div.
20ms/div.
MPM3550E Rev. 1.1
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MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 24V, VOUT = 3.3V, external COUT = 3 x 22μF, TA = 25°C, unless otherwise noted.
SCP Recovery
SCP Recovery
VIN = 24V, VOUT = 3.3V, IOUT = 0A
VIN = 24V, VOUT = 3.3V, IOUT = 5A
CH1: VOUT
5V/div.
CH1: VOUT
5V/div.
CH2: VIN
20V/div.
CH2: VIN
20V/div.
CH3: VPG
5V/div.
CH3: VPG
5V/div.
CH4: IO
5A/div
CH4: IO
5A/div
20ms/div.
20ms/div.
SCP Steady State
Current Limit
VIN = 24V, VOUT = 3.3V
VIN = 24V, VOUT = 3.3V
CH1: VOUT
2V/div.
CH1: VOUT
2V/div.
CH2: VEN
5V/div.
CH2: VEN
20V/div.
CH3: VSW
10V/div.
CH3: VSW
5V/div.
CH4: IL
2A/div.
CH4: IL
2A/div.
400ms/div.
4ms/div.
Transient
Transient
VIN = 24V, VOUT = 3.3V, IOUT = 2.5 -> 5A
VIN = 24V, VOUT = 3.3V, IOUT = 5 -> 2.5A
CH1:
VOUT/AC
50mV/div.
CH1: VOUT/AC
50mV/div.
CH4: IOUT
2A/div.
CH4: IOUT
2A/div.
10µs/div.
10µs/div.
MPM3550E Rev. 1.1
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MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
PIN FUNCTIONS
PIN #
1
Name
EN
2
RFREQ
3
PGOOD
4
FB
5
VOUT
6, 7, 9-18
GND
8
VIN
Description
Enable. Drive EN high to turn on the module. Drive EN low to turn off the module.
Frequency set. RFREQ is the input voltage and the frequency-set resistor connected
to GND to determine the on period. Do not float RFREQ.
Power good indication. The output of PGOOD rises high if the output voltage exceeds
90% of the rated voltage. The output of PGOOD drops down if the output voltage is
lower than 85% of the rated voltage.
Feedback point. The MPM3550E regulate FB to 0.815V. Connect an external resistor
(RFB1) from FB to VOUT to set the output voltage below 3.3V. For output voltages higher
than 3.3V, connect an external resistor (RFB2) from FB to GND.
Output voltage. VOUT is connected to the internal power inductor and output
capacitor. Connect VOUT to the output load and connect external bypass capacitors
between VOUT and VIN if needed.
Ground of the module.
Input voltage. VIN supplies power to the converter. Connect VIN to the input supply.
Connect external bypass capacitors between VIN and GND (pin 7) if needed.
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MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
BLOCK DIAGRAM
VIN
EMI
FILTER
Current Sense
Amplifer
CIN
REN
VCC
PGOOD
CVCC
VCC
Regulator
Reference
VREF
85% or
90%VREF
EN
ILIMIT
50%VREF
1MΩ
RSEN
Current Limit
Comparator
FREQ
RFREQ
PGOOD
Comparator
HS
Driver
CONTROL
LOGIC
UV Detect
Comparator
Soft-Start
CSS
L=3.3µH
VOUT
VCC
SCP Detect
RFREQ
GND
BST
OCP Timer
RC
Ramp
LS
Driver
COUT
Internal
FB
Resistor
FB
LOOP
Comparator
Figure 1: Functional Block Diagram
MPM3550E Rev. 1.1
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MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
OPERATION
The MPM3550E is a fully integrated,
synchronous, rectified, step-down, non-isolated,
switch-mode power module. The MPM3550E
operates with a wide 4.5V to 36V input supply
range and can achieve 5A of continuous output
current over an ambient temperature range of 40°C to +125°C. The MPM3550E provides a
default 3.3V output voltage and can be adjusted
to a range of 1.0 - 12.0V via an external FB
resistor.
Light-Load Operation
At light-load or no-load conditions, the
MPM3550E reduces the switching frequency
automatically to maintain high efficiency. After
the output current exceeds a critical current limit,
the switching frequency remains fairly constant
over the output current range.
Enable Control (EN)
The MPM3550E can be enabled or disabled via
a remote EN signal referenced to ground. The
remote EN control operates with a positive logic
compatible with popular logic devices. A positive
logic implies that the converter is enabled if the
EN signal goes high and disabled if it goes low.
The rising threshold is 1.25V, and the trailing
threshold is about 390mV lower.
EN is connected to VIN through a pull-up resistor
internally, allowing EN to be floated to enable the
module. If an application requires EN to be
controlled, use a suitable logic device to
interface with EN.
An internal 6.5V Zener diode on EN clamps the
EN voltage to prevent runaway. Therefore, when
driving EN directly with an external logic signal,
use a signal voltage below 6V to prevent
damage to the Zener diode.
Internal Soft Start (SS)
Soft start prevents the output voltage from
overshooting during start-up. When the module
starts, an internal circuitry generates a soft-start
voltage (VSS), which ramps up slowly at a
controlled slew rate. When VSS is lower than the
internal reference (VREF), VSS overrides VREF as
the error amplifier reference. Once VSS exceeds
VREF, VREF acts as the reference. At this point, the
soft start finishes, and the MPM3550E enters
steady-state operation. The soft-start time is set
to about 4.5ms internally.
If VFB drops somehow, VSS tracks VFB. This
function prevents an output voltage overshoot
during short-circuit recovery. When the short
circuit is removed, VSS ramps up as if it is a fresh
soft-start process.
Power Good Indicator (PGOOD)
The MPM3550E has a power good indicator
(PGOOD). PGOOD is the open drain of a
MOSFET connected to an internal 5V source
through a 100kΩ resistor. In the presence of an
input voltage, the MOSFET turns on so that
PGOOD is pulled to GND before the soft start is
ready. After VFB reaches 90%xVREF, PGOOD is
pulled high after a delay (typically 700μs). When
VFB drops to 85%xVREF, PGOOD is pulled low to
indicate a failure output status. The default
voltage of PGOOD is about 5V. If another
voltage is needed for compatibility, an
appropriate resistor can be placed between
PGOOD and GND or an external voltage source.
Switching Frequency
The duty ratio remains at VOUT/VIN, making the
switching frequency fairly constant over the input
voltage range. The switching frequency can be
set with Equation (1):
FSW(kHz) =
106
96 RFREQ ( k )
V
[
+ tDELAY (ns )] IN
VIN
VOUT
(1)
Where tDELAY is the comparator delay (~20ns).
The external frequency resistor values for
500kHz operations is shown in Table 1.
Table 1: External RFREQ Values
Recommended
VIN (V) VOUT (V)
fSW (kHz)
External RFREQ (kΩ)
24
1
15.8
503
24
1.5
26.1
505
24
1.8
31.6
508
24
2.5
47
502
24
3.3
63.4
503
24
5
100
496
24
12
243
504
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MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
Over-Current Protection (OCP) and ShortCircuit Protection (SCP)
To provide protection in an over-current or shortcircuit fault condition, the MPM3550E is
equipped with an internal current limit. Once the
internal inductor current exceeds the current limit,
the switches stop. Simultaneously, the overcurrent protection (OCP) timer starts. The OCP
timer is set to 100μs. Short-circuit protection
(SCP) is triggered if the current limit is reached
in each cycle during this 100μs time frame.
If a short circuit occurs, the MPM3550E reaches
its current limit immediately, and VFB drops below
50%xVREF (0.815V). The module considers this
to be an output dead short and enters hiccup
SCP mode immediately.
In hiccup mode, the module disables the output
power stage, discharges the soft-start capacitor,
and attempts to soft start automatically. If the
over-current or short-circuit condition still
remains after the soft start ends, the module
repeats this operation cycle until the fault
condition is removed and the output rises back
to the regulation level. This protection mode
reduces the average short-circuit current greatly
by restarting the part periodically to alleviate
thermal issues and protect the module.
Under-Voltage Protecting (UVP)
The MPM3550E also monitors VFB to detect an
output under-voltage condition. If VFB drops
below 50%xVREF, under-voltage protection (UVP)
is triggered, and a current limit triggers SCP.
Input
Under-Voltage
Lockout
(UVLO)
Protection
The MPM3550E has input under-voltage lockout
protection (UVLO) to ensure reliable output
power. This function prevents the module from
operating at an insufficient voltage. This is a nonlatch protection.
Thermal Shutdown
The module implements thermal protection by
monitoring the junction temperature of the
internal IC. This function prevents the device
from operating at exceedingly high temperatures.
If the junction temperature exceeds the threshold
value (175°C), the entire chip shuts down. This
is a non-latch protection. There is a hysteresis of
about 45°C. Once the junction temperature
drops to about 130°C, the module resumes
operation by initiating a soft start.
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MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
APPLICATION INFORMATION
Output Voltage Setting
The MPM3550E uses an internal FB resistor
divider to set a default 3.3V output voltage. The
upper resistor divider is 31.6kΩ, and the lower
divider resistor is 10kΩ (see Figure 2).
VOUT
VOUT
RFB_up
31.6kΩ
RFB1
Under-Voltage Lockout Point Setting
The MPM3550E has a 4.0V built-in UVLO turnon threshold with a 900mV hysteresis. When the
supply voltage exceeds the UVLO turn-on
threshold voltage, the module powers up. It
shuts off when the supply voltage falls below the
UVLO turn-off threshold voltage. An external
resistor between EN and GND can be used to
achieve a higher equivalent UVLO threshold
(see Figure 3).
FB
RFB_down
10kΩ
RFB2
VIN
GND
REN_up
499kΩ
EN
Figure 2: FB Resistors for Setting Output Voltage
The MPM3550E regulate its FB pin at 0.815V.
By connecting an external resistor to FB, the
output can be set to any voltage between 1 - 12V.
For applications with a VOUT lower than 3.3V,
connect an appropriate resistor (RFB1) between
FB and VOUT. For applications with a VOUT over
3.3V, connect an appropriate resistor (RFB2)
between FB and GND. Calculate the rough value
of this resistor with Equation (2) and Equation (3):
R FB1 =
31.6//620×(VOUT −0.815)
R FB2 =
3.3−VOUT
31.6//620×0.815
VOUT −3.3
, VOUT < 3.3V (2)
, VOUT > 3.3V
(3)
The calculated resistance may need fine-tuning
during the bench test. For some typical
applications, Table 2 provides the corresponding
RFB values for different output voltages.
Table 2: RFB Values for Typical VOUT
VOUT (V)
RFB1 (kΩ)
RFB2 (kΩ)
1.0
1.2
1.5
1.8
2.5
3.3
5
12
2.4
5.49
11.5
19.6
63.4
NS
NS
NS
NS
NS
NS
NS
NS
NS
14.3
2.7
REN_down
1MΩ
RUVLO
GND
Figure 3: Adjustable UVLO with External
Resistor
The resistor for adjusting the UVLO can be
calculated with Equation (4):
RUVLO (k) =
623.75
VIN − 1.87
(4)
The calculated resistance may need fine-tuning
during the bench test.
Selecting the Input Capacitor
The MPM3550E has three, internal, 4.7μF input
ceramic capacitors. This is sufficient for common
applications. To minimize the input ripple voltage,
extra external capacitors can be placed adjacent
to the VIN pin of the module.
For the best performance, use ceramic
capacitors with low ESR. The capacitance can
vary significantly with the temperature.
Capacitors with X5R and X7R ceramic
dielectrics are recommended because they are
fairly stable over a wide temperature range.
Other types of capacitors, including Y5V and
Z5U, are not recommended since they lose too
much capacitance with the frequency,
temperature, and bias voltage.
For a small solution size, choose a capacitor with
a proper package size and a rating voltage
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MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
compliant to the input specification. Table 3
shows a list of recommended input capacitors.
Table 3: Recommended Input Capacitors
Value
Description
Vendor
4.7μF 50V,X7S,0805 Murata
4.7μF 50V,X6S,0805
TDK
TDK
TDK
GRM32ER71H106KA12
C3225X7R1H106M250AC
10μF 25V,X7S,0805 Murata
10μF 25V,X5R,0603
GRM21BC71H475KE11
C2012X6S1H475K125AC
10μF 50V,X7R,1210 Murata
10μF 50V,X7R,1210
Part Number
GRM21BC71E106KE11
C1608X5R1E106M080AC
The capacitors must also have a ripple current
rating that exceeds the converter’s maximum
input ripple current. Estimate the input ripple
current with Equation (5):
ICIN = IOUT
VOUT
V
(1 − OUT )
VIN
VIN
(5)
The worst-case condition occurs at VIN = 2VOUT,
shown in Equation (6):
ICIN =
IOUT
2
(6)
For simplification, choose an input capacitor with
an RMS current rating that exceeds half the
maximum load current.
The input capacitance value determines the
converter input voltage ripple. If there is an input
voltage ripple requirement in the application,
choose an external capacitor that meets the
specification.
Estimate the input voltage ripple with Equation
(7):
IOUT
V
V
VIN =
OUT (1 − OUT )
FSW CIN
VIN
VIN
(7)
The worst-case condition occurs at VIN = 2VOUT,
shown in Equation (7):
VIN =
IOUT
1
4 FSW CIN
(8)
Selecting the Output Capacitor
The MPM3550E has an internal, 10μF, output
ceramic capacitor for stable operation. To
reduce the output ripple and improve the load
transient response, it is recommended to add an
external output capacitor as close to the board
as possible.
Low ESR ceramic capacitors are recommended
for the best performance. The capacitance can
vary significantly with the temperature.
Capacitors with X5R or X7R ceramic dielectrics
are recommended because they are fairly stable
over a wide temperature range. Other types of
capacitors, including Y5V and Z5U, are not
recommended since these lose too much
capacitance with the frequency, temperature,
and bias voltage. Initial values of 10 - 47μF may
be tried in either single or multiple capacitor
configurations in parallel. Table 4 shows a list of
recommended output capacitors.
Table 4: Recommended Output Capacitors
Value
Description
10μF 25V,X7S,0805
10μF 16V, X5R,0805
Vendor
Part Number
Murata GRM21BC71E106KE11L
TDK
C2012X5R1C106K
22μF 16V,X5R,0805 Murata GRM219R61C226ME15L
22μF 16V,X7R,0805
TDK
C2012X7R1C226MT000N
47μF 16V, X5R,1210 Murata GRM32ER61C476ME15L
The output voltage ripple can be estimated with
Equation (9):
VOUT =
VOUT
V
1
(1 − OUT ) (RESR +
) (9)
fSW L
VIN
8 fSW COUT
When using ceramic capacitors, the capacitance
dominates the impedance at the switching
frequency. The capacitance also dominates the
output voltage ripple. For simplification, estimate
the output voltage ripple with Equation (10):
VOUT =
VOUT
V
(1 − OUT ) (10)
8 fSW L COUT
VIN
2
EMI Considerations
High radiated EMI noise is a disadvantage for
switching regulators. Fast switching turn-on and
turn-off create a large di/dt change in the
converters, which act as the radiation sources in
most systems. The MPM3550E is designed with
an input EMI filter and other features to make its
radiated emissions compliant with several EMC
specifications, including CISPR22 Class B. The
MPM3550E can meet CISPR25 Class 5 specs
by adding only a small external input filter. For
example, an LC low-pass filter consisting of two,
10µF capacitors and a 3.3µH inductor is
sufficient. Conducted emission
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MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
specifications, including CISPR22 Class B and
CISPR25 Class 5, can be met with this filter. The
filter inductor must be placed at a certain
distance to the module main inductor to avoid
magnetic coupling. A shielded inductor is
recommended (see Figure 4).
Input (+)
3.3µH
12V
10µF
MPM3550E
Load
10µF
Input (-)
Figure 4: MPM3550E with EMI filter
PCB Layout Guidelines
The difficult parts of PCB layout are alleviated or
even eliminated by the high level of integration of
the MPM3550E. To achieve optimal electrical
and thermal performance, an optimized PCB
layout is critical. For best results, refer to Figure
5 and follow the guidelines below.
1. Use large copper areas for the power planes
(VIN, VOUT, and GND) to minimize
conduction loss and thermal stress.
2. Use multiple vias to connect the power
planes to internal layers.
Input Fusing
Certain applications may require fuses at the
inputs of the power module. Fuses should be
used when there is the possibility of sustained
input voltage reversal, which is not currentlimited. For safety, it is recommend to install a
fast blow fuse in the ungrounded input supply
line. The installer must observe all relevant
safety standards and regulations.
3. Place the vias away from the pads and vias
on the module board.
Thermal Considerations
The MPM3550E can accommodate a wide range
of ambient temperatures due to its extremely
high power conversion efficiency and low power
dissipation. However, the output current may
need to be derated if it is required to operate in a
high ambient temperature or deliver a large
amount of continuous power. The amount of the
current derating depends on the input voltage,
output power, and ambient temperature. The
temperature rise curves in the Typical
Performance Characteristics section can be
used as a guide. These curves were generated
by an MPM3550E mounted to a 40cm2, 2-layer,
FR4, printed circuit board (PCB). Boards of other
sizes and layer counts can exhibit different
thermal behavior, making it inconvenient for
users to verify the proper operation over the
intended system’s line, load, and environmental
operating conditions.
5. Keep the connections as short and wide as
possible.
The thermal shutdown temperature of the
MPM3550E is 175°C, so the layout of the circuit
should be done carefully to ensure good heat
sinking. The bulk of the heat flows through the
bottom of the MPM3550E module and the pads
into the PCB. Consequently, a poor PCB design
can cause excessive heat, resulting in impaired
performance or reliability.
These vias can provide a good connection
and thermal path to the internal planes of the
PCB.
4. Place ceramic input and output capacitors
close to the module pins to minimize high
frequency noise.
6. Place RFB as close to FB as possible.
Figure 5: Recommended Layout (Top Layer)
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MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
TYPICAL APPLICATION CIRCUITS
VIN
4.5-36VDC
VIN
RFREQ
RFREQ
RF
15.8kΩ
PGOOD
EN
VOUT
MPM3550E
VOUT
RFB1
2.4kΩ
FB
1.0V
COUT
22µF
FB
PGOOD
EN
GND
GND
Figure 6: Typical Application Circuit with 1.0V Output
VIN
4.5-36VDC
RFREQ
RF
31.6kΩ
PGOOD
EN
VIN
VOUT
MPM3550E
RFREQ
VOUT
RFB1
19.6kΩ
FB
1.8V
COUT
22µF
FB
PGOOD
EN
GND
GND
Figure 7: Typical Application Circuit with 1.8V Output
VIN
4.5-36VDC
RFREQ
PGOOD
EN
RF
47kΩ
VIN
VOUT
MPM3550E
RFREQ
FB
VOUT
RFB1
63.4kΩ
2.5V
COUT
22µF
FB
PGOOD
EN
GND
GND
Figure 8: Typical Application Circuit with 2.5V Output
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MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
TYPICAL APPLICATION CIRCUITS (continued)
VIN
4.5~36VDC
VIN
RFREQ
RFREQ
PGOOD
PGOOD
RF
63.4kΩ
MPM3550E
EN
EN
VOUT
COUT
FB
VOUT
3.3V
FB
GND
GND
Figure 9: Typical Application Circuit with 3.3V Output
VIN
6~36VDC
VIN
VOUT
MPM3550E
RFREQ
RFREQ
RF
100kΩ
PGOOD
FB
FB
RFB2
14.3kΩ
PGOOD
EN
EN
VOUT
COUT 5V
22µF
GND
GND
Figure 10: Typical Application Circuit with 5V Output
VIN
14~36VDC
VIN
RFREQ
RFREQ
PGOOD
PGOOD
RF
243kΩ
EN
VOUT
MPM3550E
EN
VOUT
COUT 12V
22µF
FB
FB
RFB2
2.7kΩ
GND
GND
Figure 11: Typical Application Circuit with 12V Output
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MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
PACKAGE INFORMATION
LGA-18 (12mmx12mmx3.82mm)
PIN 1 ID
0.43x45° TYP.
PIN 1 ID
MARKING
PIN 1 ID INDEX
AREA
BOTTOM VIEW
TOP VIEW
SIDE VIEW
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) DRAWING IS NOT TO SCALE.
RECOMMENDED LAND PATTERN
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MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
CARRIER INFORMATION
Detail A
Pin 1
ABCD
1
Detail A
Note:
This is a schematic diagram of Tray. Different packages correspond to different trays with different length, width and height.
Part Number
Package Description
Quantity/
Reel
Quantity/
Tube
Quantity/
Tray
Reel
Diameter
Carrier
Tape
Width
Carrier
Tape
Pitch
MPM3550EGLE
LGA-18
(12mmx12mmx3.82mm)
N/A
N/A
168
N/A
N/A
N/A
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MPM3550E – 36V, 5A, HIGH-EFFICIENCY, NON-ISOLATED, DC/DC POWER MODULE
REVISION HISTORY
Revision #
1.0
Revision Date
3/26/2021
1.1
4/22/2022
Description
Initial Release
Update height from 4.2mm to 3.82mm
Add MSL rating
Update Package Information
Add Carrier Information section
Pages Updated
1, 2, 3, 20, 21
2
20
21
Notice: The information in this document is subject to change without notice. Users should warrant and guarantee that thirdparty Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume
any legal responsibility for any said applications.
MPM3550E Rev. 1.1
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