MPM3570E
Ultra Low EMI, 75V Input,
0.3A Step-Down Power Module
with Integrated Inductor
DESCRIPTION
FEATURES
The MPM3570E is a high density, non-isolated,
DC/DC power module for space-sensitive
applications. It offers a very compact solution
that achieves 0.3A of output current over a wide
4.5V to 75V input supply range and can provide
an adjustable output voltage from 1.0V to 12V
via an external FB resistor (default 3.3V output).
The MPM3570E integrates a switching
controller, power switches, inductors, a modest
amount of input and output capacitors, and all
supporting components in a small package size.
This compact solution helps system design and
production significantly by offering a greatly
simplified
board
design,
layout,
and
manufacturing requirements.
Ultra-high efficiency is achieved through
synchronous
rectification
and
control
techniques,
especially
under
light-load
conditions. A 25μA shutdown quiescent current
in the full temperature range is optimal for
battery-powered applications.
The MPM3570E offers standard features,
including internal fixed soft start (SS), remote
enable (EN) control, and power OK indication
(POK). Full protection features include overcurrent protection (OCP), under-voltage lockout
(UVLO), and thermal shutdown.
The MPM3570E requires a minimal number of
external components and is available in a
compact LGA8 (10mmx10mmx4.2mm) package.
Integrated Inductor, Switches, and
Controller
High Efficiency, Synchronous
Low Component Count and Small Size
Ease of Design and Fastest Time to Market
Wide 4.5V to 75V Operating Input Range
Output Adjustable from 1V to 12V
0.3A Output Current
40μA Quiescent Current
Ultra-Fast Transient Response
Internal Fixed Soft-Start (SS) Time
Power OK Indicator (POK)
Non-Latch Over-Current Protection (OCP)
and Under-Voltage Lockout (UVLO)
Thermal Shutdown Protection
Remote Enable (EN) Control
Weight: 0.80g
Operating Temperature: -40°C to +125°C
CISPR25 Class 5 Compliant
Available in a LGA8 (10mmx10mmx4.2mm)
Package
APPLICATIONS
Automotive Systems
Industrial Supplies
Telecom and Networking Systems
Distributed Power and POL Systems
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
POK
EN
VIN
CIN
VOUT
MPM3570E
POK
EN
FB
GND
COUT
Efficiency
VOUT
3.3V
VOUT=3.3V
90
85
FB
GND
80
EFFICIENCY (%)
VIN
4.5-75VDC
75
70
65
60
55
VIN=24V,VO=3.3V
50
VIN=36V,VO=3.3V
45
40
0.001
VIN=48V,VO=3.3V
0.01
0.1
1
LOAD CURRENT (A)
MPM3570E Rev. 1.0
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1
MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
ORDERING INFORMATION
Part Number*
MPM3570EGLD
Package
LGA-8 (10mmx10mmx4.2mm)
Top Marking
See Below
* For Tape & Reel, add suffix –Z (e.g. MPM3570EGLD–Z).
TOP MARKING
MPS: MPS prefix
YY: Year code
WW: Week code
MPM3570E: First eight digits of the part number
LLLLLLLLL: Lot number
PACKAGE REFERENCE
TOP VIEW
EN
1
8
VIN
FB
2
7
GND
GND
3
6
GND
POK
4
5
VOUT
LGA-8 (10mmx10mm)
MPM3570E Rev. 1.0
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MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
PIN FUNCTIONS
PIN #
1
Name
EN
2
FB
3, 6, 7
GND
4
POK
5
VOUT
8
VIN
Description
Enable. Drive EN high to turn on the module, and drive it low to turn off the module.
Feedback point. The MPM3570E regulates its FB pin to 1V. Connect an external
resistor (RFB1) from FB to VOUT to set the output voltage (for an output voltage
smaller than 3.3V). For output voltage larger than 3.3V, connect an external resistor
(RFB2) from FB to GND.
Ground.
Power OK indication. The output of POK will go HIGH if the output voltage
exceeds 90% of the rated voltage. It will drop down if the output voltage is less than
84% of the rated voltage.
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 pin 6 if needed.
Input voltage. VIN supplies all power to the module. Connect VIN to the input
supply and connect external bypass capacitors of at least 4.7µF between VIN and
pin 7.
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (4)
VIN ................................................-0.3V to +80V
All other pins ................................-0.3V to +6.0V
Continuous power dissipation (TA = +25°C) (2)
LGA8 (10mmx10mmx4.2mm) .................... 2.5W
Junction temperature ................................150°C
Lead temperature .....................................260°C
Storage temperature .................. -65°C to 150°C
LGA-8 (10mmx10mm) ........... 50 ....... 20 ... °C/W
Recommended Operating Conditions (3)
Continuous supply voltage (VIN) ..... 4.5V to 75V
Output voltage (VOUT) ................. 1.0V to 12.0V
Operating temperature (TO) ..... -40°C to +125°C
θJA
θJC
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) θJA: the thermal resistance from junction-to-ambient. This is
the natural convection junction-to-ambient air thermal
resistance measured in a one cubic foot sealed enclosure.
θJC: the 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.
MPM3570E Rev. 1.0
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MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
ELECTRICAL CHARACTERISTICS
VIN = 12V, External CIN=2x4.7μF, COUT=2x22μF, TA = -40C to +125C, unless otherwise noted.
Parameters
Input Voltage and Current
Input DC voltage range
Maximum input current
Input current (shutdown)
Input current (quiescent)
Input Under-Voltage Lockout
VIN UVLO rising threshold
VIN UVLO falling threshold
Output Voltage and Current
Output range
Symbol
VIN
IIN-MAX
IIN
IIN
VOUT
Output voltage precision(5)
Output regulation (VOUT=3.3V)
(5)
Output regulation (VOUT=5V)
(5)
Output ripple (VOUT=3.3V) (5)
VOUT (AC)
Output ripple (VOUT=5V) (5)
VOUT (AC)
Output current range
Condition
IOUT
Min
Typ
4.5
Units
75
110
15
18
25
40
V
mA
µA
µA
3.85
3.35
4.2
3.75
4.5
4.15
V
V
1.0
3.3
5.0
V
-2.0
+2.0
%
-3.0
+3.0
%
-2.0
+2.0
%
-2.0
+2.0
%
-2.0
+2.0
%
-2.0
+2.0
%
IOUT = 0.3A, VOUT = 3.3V
VEN = 0V
Enabled, no load, VOUT = 3.3V
Via an external FB resistor
Output 3.3V, over all supply
voltage, load current, TA=25C
Output 3.3V, over all supply
voltage, load current and
temperature range
Line regulation (VIN = 4.5V to
75V, IOUT =0A), TA=25C
Load regulation (IOUT = 0A to
0.3A), TA=25C
Line regulation (VIN = 4.5V to
75V, IOUT = 0A), TA=25C
Load regulation (IOUT = 0A to
0.3A), TA=25C
Max
VIN = 12V, Iout=0.3A, TA=25C
30
mV
VIN = 24V, Iout=0.3A, TA=25C
25
mV
VIN = 12V, Iout=0.3A, TA=25C
30
mV
VIN = 24V, Iout=0.3A, TA=25C
25
mV
0
MPM3570E Rev. 1.0
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0.3
A
4
MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, External CIN=2×4.7μF, COUT=2×22μF, TA = -40C to +125C, unless otherwise noted.
Parameters
Symbol
Output Turn-On Delay and Rise Time
Turn-on delay time
TDELAY
Rise time
TRISE
Condition
Min
IOUT = 0A, from EN high to
10% of the rated VOUT
IOUT = 0A, from 10% to 90%
of the rated VOUT
Typ
Max
Units
0.9
ms
1.4
ms
VIN=12V, IOUT =0.15A,TA=25C
85.5
%
VIN=24V, IOUT =0.15A,TA=25C
85.2
%
VIN=12V, IOUT =0.15A,TA=25C
88.5
%
VIN=24V, IOUT =0.15A,TA=25C
88.2
%
140
kHz
165
kHz
Efficiency
Efficiency (VOUT = 3.3V) (5)
η
Efficiency (VOUT = 5V) (5)
η
Frequency
(5)
Switching frequency
EN (Active High)
EN input rising threshold
EN input falling threshold
EN threshold hysteresis
POK
POK rising threshold
POK falling threshold
POK deglitch time
POK default voltage
fSW
IOUT = 0.3A, VOUT = 3.3V,
TA=25C
IOUT = 0.3A, VOUT = 5V,
TA=25C
VEN-RISING
VEN-FALLING
VEN-HYS
POKVth-Rising
POKVth-Falling
tPOK
VPOK
VOUT = 3.3V
1.35
1.1
1.6
1.2
400
1.85
1.3
V
V
mV
86%
80%
90%
84%
40
3.28
94%
88%
VFB-REF
VFB-REF
µs
V
Thermal Protection
Thermal shutdown(5)
Thermal shutdown
hysteresis(5)
TSD
175
°C
TSD-HYS
20
°C
Note:
5) Derived from bench characterization, not tested in production.
MPM3570E Rev. 1.0
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MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VOUT = 3.3V, External CIN=2x4.7μF, COUT=2x22μF, TA = 25ºC, unless otherwise noted.
Efficiency
Efficiency
VOUT=5.5V
90
85
85
80
80
75
75
EFFICIENCY (%)
EFFICIENCY (%)
VOUT=3.3V
90
70
65
60
55
VIN=24V,VO=3.3V
50
VIN=36V,VO=3.3V
45
VIN=48V,VO=3.3V
40
0.001
0.01
0.1
70
65
60
55
VIN=24V,VO=5V
VIN=36V,VO=5V
VIN=48V,VO=5V
50
45
40
0.001
1
0.01
LOAD CURRENT (A)
LINE REGULATION (%)
LINE REGULATION (%)
Line Regulation vs. Vin
VO=3.3V,IO=0.15A
VO=3.3V,IO=0.3A
0
20
40
60
INPUT VOLTAGE (V)
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
VO=5V,IO=0.15A
VO=5V,IO=0.3A
0
80
20
40
60
80
INPUT VOLTAGE (V)
Load Regulation vs. Iout
Load Regulation vs. Iout
2
2
1.5
VIN=24V,VO=3.3V
1
VIN=36V,VO=3.3V
0.5
VIN=48V,VO=3.3V
LOAD REGULATION (%)
LOAD REGULATION (%)
1
LOAD Current (A)
Line Regulation vs. Vin
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
0.1
0
-0.5
-1
-1.5
1.5
VIN=24V,VO=5V
1
VIN=36V,VO=5V
0.5
VIN=48V,VO=5V
0
-0.5
-1
-1.5
-2
-2
0
0.1
0.2
LOAD CURRENT (A)
0.3
0
0.1
0.2
LOAD CURRENT (A)
MPM3570E Rev. 1.0
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3/1/2019
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0.3
6
MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VOUT = 3.3V, External CIN=2x4.7μF, COUT=2x22μF, TA = 25ºC, unless otherwise noted.
Thermal Derating
OUTPUT CURRENT (A)
0.5
0.4
0.3
0.2
0.1
0
20
40
60
80
100
120
AMBIENT TEMPERATURE (°C)
MPM3570E Rev. 1.0
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MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
With External EMI Filter: 10μF+4.7μH, External COUT=1×22μF, Io=0.3A (CISPR25 Class 5)
Radiated Emissions Performance
Conducted Emissions Performance
EMI Filter Circuit
MPM3570E Rev. 1.0
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MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VOUT = 3.3V, External CIN=2x4.7μF, COUT=2x22μF, TA = 25ºC, unless otherwise noted.
Vo Ripple
Vo Ripple
IOUT=0A
IOUT=0.3A
CH1:
VOUT/AC
20mV/div.
CH1:
VOUT/AC
20mV/div.
CH4: IOUT
1A/div.
CH4: IOUT
100mA/div.
40ms/div.
4µs/div.
Vin Start-Up
Vin Start-Up
IOUT=0A
IOUT=0.3A
CH1: VOUT
2V/div.
CH1: VOUT
2V/div.
CH2: VIN
5V/div.
CH2: VIN
5V/div.
CH3: POK
2V/div.
CH3: POK
1V/div.
CH4: IOUT
100mA/div.
CH4: IOUT
200mA/div.
1ms/div.
1ms/div.
Vin Shutdown
Vin Shutdown
IOUT=0A
IOUT=0.3A
CH1: VOUT
2V/div.
CH1: VOUT
2V/div.
CH2: VIN
5V/div.
CH2: VIN
5V/div.
CH3: POK
2V/div.
CH3: POK
2V/div.
CH4: IOUT
200mA/div.
CH4: IOUT
200mA/div.
20ms/div.
4ms/div.
MPM3570E Rev. 1.0
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MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, External CIN=2x4.7μF, COUT=2x22μF, TA = 25ºC, unless otherwise noted.
EN Start-Up
EN Start-Up
IOUT=0A
IOUT=0.3A
CH1: VOUT
2V/div.
CH1: VOUT
2V/div.
CH2: VIN
10V/div.
CH2: VIN
10V/div.
CH3: EN
2V/div.
CH3: POK
2V/div.
CH4: IOUT
200mA/div.
CH4: IOUT
200mA/div.
1ms/div.
1ms/div.
EN Shutdown
EN Shutdown
IOUT=0A
IOUT=0.3A
CH1: VOUT
2V/div.
CH1: VOUT
2V/div.
CH2: VIN
10V/div.
CH2: VIN
10V/div.
CH3: EN
2V/div.
CH3: POK
2V/div.
CH4: IOUT
200mA/div.
CH4: IOUT
200mA/div.
200ms/div.
1ms/div.
EN On/Off Cycle
EN On/Off Cycle
IOUT=0A
IOUT=0.3A
CH1: VOUT
2V/div.
CH1: VOUT
2V/div.
CH2: VIN
10V/div.
CH2: VIN
10V/div.
CH3: EN
2V/div.
CH3: EN
2V/div.
CH4: IOUT
200mA/div.
CH4: IOUT
200mA/div.
1s/div.
1s/div.
MPM3570E Rev. 1.0
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MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, External CIN=2x4.7μF, COUT=2x22μF, TA = 25ºC, unless otherwise noted.
SCP Steady State
CH1: VOUT
2V/div.
CH2: VIN
10V/div.
CH3: POK
2V/div.
CH4: IOUT
200mA/div.
40µs/div.
MPM3570E Rev. 1.0
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MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
BLOCK DIAGRAM
VIN
EMI
FILTER
REN
VOUT
POK
Regulator
BIAS
VCC
Reference
Current
Limit
Comparator
RSEN
ILIMIT
HS
Driver
VREF
CVCC
GND
BST
3Mohm
85% or 90%VREF
EN
Current
Sense
Amplifer
CIN
L 22uH
Zero Current
Detector
POK
Comparato
r
LOGIC
VCC
LS
Driver
Soft-Start
CSS
VOUT
CONTROL
LOOP
Comparator
COUT
Internal
FB
Resistor
FB
Figure 1: Functional Block Diagram
MPM3570E Rev. 1.0
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MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
OPERATION
The MPM3570E is a fully integrated,
synchronous, rectified, step-down, non-isolated
switch-mode power module. A block diagram of
the device is shown in Figure 1. It is available
with a 4.5V to 75V wide input supply range and
can achieve 0.3A continuous output current over
an ambient temperature range of -40°C to
+125°C.This module provides a default 3.3V
output voltage and can be adjusted to a range of
1.0V to 12.0V output via an external FB resistor.
Enable Control
The MPM3570E can be enabled or disabled via a
remote EN signal, which is referenced to ground.
The remote EN control operates with positive logic,
which is compatible with popular logic devices.
Positive logic implies that the converter is enabled if
the EN signal goes high, and disabled if the EN
signal goes low. Its rising threshold is 1.6V, and
the trailing threshold is about 400mV lower.
When EN = 0V, the module goes into the lowest
shutdown current mode. When EN is higher than
zero, but lower than its rising threshold, the
module remains in shutdown mode with a slightly
larger shutdown current.
EN is connected to the VIN through a pull-up
resistor internally, allowing the user to enable the
device with this pin floating. If an application
requires remote EN control, use a suitable logic
device to interface with EN.
An internal 6.5V Zener diode on EN clamps the
pin voltage to prevent runaway. Therefore, when
driving EN directly with an external logic signal,
use a signal voltage less than 6V to prevent
damage to the Zener diode.
Internal Soft Start
Soft start ramps VOUT gradually during start-up
to prevent overshoot. When the module starts up,
the internal circuitry generates a soft-start voltage
(VSS), which ramps up at a slow pace set by the
soft-start time. When VSS is lower than VREF, VSS
takes over VREF as the reference to the FB
comparator. Once VSS exceeds VREF, VREF
resumes control. At this point, soft start finishes,
and the MPM3570E enters steady state. The
soft-start time is set to about 1.4ms internally.
If VFB drops, VSS tracks VFB. This function
prevents output voltage from overshooting in
short-circuit recovery. When the short circuit is
removed, the VSS ramps up as if it is a fresh softstart process.
Power OK Indicator
The MPM3570E has a power OK (POK)
indicator. POK is the open drain of a MOSFET,
and it is connected to VOUT internally through a
100kΩ resistor. In the presence of an input
voltage, the MOSFET turns on so that POK is
pulled to GND before the soft start is ready. After
VFB reaches 90%×VREF, POK is pulled high after
a delay. When VFB drops to 84%×VREF, POK will
be pulled low. The default voltage of POK is the
same as VOUT. If another voltage is needed for
compatibility, an appropriate resistor can be
placed between POK and GND or an external
voltage source.
Over-Current Protection (OCP)
The MPM3570E is equipped with an internal
current limit, which can provide over-current
protection (OCP) in an over-current fault
condition. This is very helpful to reduce the OCP
thermal dissipation, which may worsen when the
output voltage is shorted.
Input UVLO protection
The MPM3570E has under-voltage lockout
protection (UVLO) to ensure reliable output
power. This function prevents the module from
operating when the input voltage is too low.
UVLO is a non-latch protection.
Thermal Shutdown
The module has thermal protection by monitoring
the junction temperature of the internal IC. This
function prevents the device from operating at an
exceedingly high temperature. If the junction
temperature exceeds the threshold value
(175ºC), it shuts down the whole device. This is a
non-latch protection. There is about a 20ºC
hysteresis. Once the junction temperature drops
to about 155ºC, the module resumes operation
by initiating a soft start.
MPM3570E Rev. 1.0
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MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
APPLICATION INFORMATION
Output Voltage Setting
Under Voltage Lockout Point Setting
The MPM3570E has an internal FB divider to set
a default 3.3V output voltage. The upper divider
resistor is 1.2MΩ, and the lower divider resistor is
523kΩ (see Figure 2).
The MPM3570E has a 4.2V built-in UVLO rising
threshold with a 450mV hysteresis. An external
resistor between EN and GND can be used to
get a higher equivalent UVLO threshold (see
Figure 3).
VOUT
RFB_up
1.2M
VOUT
VIN
RFB1
REN_up
1M
FB
RFB_down
523k
EN
RFB2
REN_down
3M
GND
RUVLO
GND
Figure 2: Adjusting Output with FB Resistors
The MPM3570E regulates FB to 1V. By
connecting an external trim resistor, the output
can be set to any voltage from 1.0V to 5.0V. For
a VOUT less than 3.3V, connect an appropriate
resistor (RFB1) between FB and VOUT. For a VOUT
over 3.3V, connect an appropriate resistor (RFB2)
between FB and GND. These two resistors can
be calculated with Equation (1) and Equation (2):
RFB1(k)
1200 (VOUT 1)
, VOUT 3.3V
3.3 VOUT
1200
RFB2 (k)
VOUT 3.3
, VOUT 3.3V
(1)
(2)
The calculated resistance may need fine-tuning
during the bench test. For typical applications,
Table 1 provides the RFB values for different
output voltages.
Table 1: RFB Values to Typical VOUT
VOUT (V)
RFB1 (kΩ)
RFB2 (kΩ)
1.0
1.2
1.5
1.8
2.5
3.3
5
0
110
324
634
2200
NS
NS
NS
NS
NS
NS
NS
NS
698
Figure 3: Adjustable UVLO using EN Pin
The resistor for adjusting the UVLO can be
calculated with Equation (3):
RUVLO (k)
1600
VIN 2.13
(3)
The calculated resistance may need fine-tuning
during the bench test.
Input Capacitor
The MPM3570E integrates 3x0.1μF high
frequency decoupling input ceramic capacitors to
reduce switching spikes. A minimum input
capacitance of 4.7μF is required adjacent to the
VIN pin for common application. To minimize the
input ripple voltage, more external capacitors
may be needed.
Ceramic capacitors with low ESR are
recommended for best performance. The
capacitance
can
vary
significantly
with
temperature. Use capacitors with X5R and X7R
ceramic dielectrics because they are fairly stable
over a wide temperature range. Other types,
including Y5V and Z5U, must not be used as
they lose too much capacitance with frequency,
temperature, and bias voltage.
MPM3570E Rev. 1.0
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MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
To achieve a smaller solution size, choose a
proper package size capacitor with a rating
voltage compliant to the input spec. Table 2
contains a list of recommended input capacitors.
Table 2: Recommended Input Capacitors
Value
Description
Vendor
Part Number
4.7μF 100V,X7S,1210 Murata GRM32DC72A475KE01
4.7μF 100V,X7S,1210
TDK C3225X7S2A475K200AB
10μF
50V,X7R,1210 Murata GRM32ER71H106KA12
10μF
50V,X7R,1210
10μF
25V,X7S,0805
10μF
25V,X5R,0603
TDK C3225X7R1H106M250AC
Murata GRM21BC71E106KE11
TDK 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 (4):
ICIN IOUT
VOUT
V
(1 OUT )
VIN
VIN
(4)
The worst-case condition occurs at VIN = 2VOUT,
where:
I
ICIN OUT
(5)
2
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, choose an external
capacitor that meets the specification.
Estimate the input voltage ripple with Equation
(6):
IOUT
V
V
(6)
VIN
OUT (1 OUT )
FSW CIN VIN
VIN
The worst-case condition occurs at VIN = 2VOUT,
where:
IOUT
1
(7)
VIN
4 FSW CIN
Output Capacitor
The MPM3570E has an integrated 22μF output
ceramic capacitor for stable operation. To reduce
the output ripple and improve load transient
response, add external capacitors as close as
possible to the load. Ceramic capacitors with low
ESR are recommended for best performance.
The capacitance can vary significantly with
temperature. Use capacitors with X5R and X7R
ceramic dielectrics, because they are fairly stable
over a wide temperature range. Other types,
including Y5V and Z5U, must not be used as
they lose too much capacitance with frequency,
temperature, and bias voltage. Initial values of
10μF to 47μF may be tried (either single or
multiple capacitors in parallel). Table 3 contains a
list of recommended output capacitors.
Table 3: Recommended Output Capacitors
Value
Description
Vendor
Part Number
10μF
10V,X7R,0805 Murata GRM21BR71A106KE51
10μF
10V,X7R,0805
TDK C2012X7R1A106K125AC
22μF
10V,X7T,0805
22μF
10V,X7S,0805
Murata GRM21BD71A226ME44
47μF
10V,X5R,0805 Murata GRM21BR61A476ME15
47μF
10V,X5R,0805
TDK C2012X7S1A226M125AC
TDK C2012X5R1A476M125AC
The output voltage ripple can be estimated with
Equation (8):
VOUT
VOUT
V
1
(1 OUT ) (R ESR
) (8)
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 (9):
VOUT
VOUT
V
(1 OUT )
8 fSW L COUT
VIN
2
(9)
EMI Considerations
High radiated EMI noise is a disadvantage for
switching regulators. Fast switching turn-on and
turn-off create the large di/dt change in the
converters, which acts as the radiation sources
in most systems. The MPM3570E 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 MPM3570E can meet CISPR25
Class 5 by adding only a small external input
filter. For example, a PI model filter consisting of
a 10µF capacitor, 2.2µH inductor, and 22µF
capacitor is sufficient. Also, conducted emissions
specifications, including CISPR22 Class B and
CISPR25 class 5, can be met with this filter (see
Figure 4).
MPM3570E Rev. 1.0
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MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
Input (+)
12V
2.2µH
MPM3570E
10µF
Load
22µF
Input (-)
Figure 4: MPM3570E with EMI filter
The filter inductor needs to be placed at a certain
distance to the module’s main inductor to avoid
magnetic coupling. As the rating current is not
large, a multi-layer inductor with a small package
is preferred. Table 4 contains a list of
recommended filter inductors.
Table 4: Recommended Filter Inductors
Value
Description
Vendor
Part Number
2.2μH 0.75A,300mΩ,0603 Murata LQM18PN2R2MFRL
Taiyo
2.2μH 0.65A ,300mΩ,0603
CKP1608D2R2M-T
Yuden
Input Fusing
Certain applications may require fuses at the
inputs of the power module. Fuses should also
be used when there is the possibility of sustained
input voltage reversal, which is not currentlimited. For safety, we recommend a fast blow
fuse installed in the ungrounded input supply line.
Thermal Considerations
The MPM3570E’s ability to accommodate a wide
range of ambient temperatures is the result of its
extremely high power conversion efficiency and
resulting 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 current
derating is dependent upon the input voltage,
output power, and ambient temperature. The air
velocity (forced or natural convection) may also
affect the thermal condition. The derating curves
and temperature rise curves given in the Typical
Performance Characteristics section can be used
as a guide. These curves were generated by an
MPM3570E mounted to a 40cm2, 2-layer FR4
printed circuit board. Boards of other sizes and
layer count can exhibit different thermal behavior,
so it is incumbent upon the user to verify proper
operation over the intended system’s line, load,
and environmental operating conditions.
layout of the circuit to ensure good heat sinking.
The bulk of the heat flow out of the MPM3570E is
through the bottom of the module and the pads
into the printed circuit board. Consequently, a
poor printed circuit board design can cause
excessive heating, resulting in impaired
performance or reliability. Please refer to the
PCB layout section below for printed circuit board
design suggestions.
PCB Layout Guidelines
Common PCB layout problems have been
alleviated or even eliminated by the high level of
integration of the MPM3570E. For optimal
performance, refer to Figure 5 and Figure 6 and
follow the guidelines below:
1. Use large copper areas for power planes
(VIN, VOUT, and GND) to minimize
conduction loss and thermal stress.
2. Use multiple vias to connect the power
planes to the internal layers.
3. Place the vias away from pads and vias on
the module board.
These vias can provide both a good
connection and thermal path to the internal
planes of the printed circuit board.
4. Place the ceramic input and output capacitors
close to the module pins to minimize high
frequency noise.
5. Keep the connections as short and wide as
possible.
6. Place RFB as close to FB as possible.
The thermal shutdown temperature of the
MPM3570E is 175°C, so carefully consider the
MPM3570E Rev. 1.0
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MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
Figure 5: Top-Layer Recommended Layout
Figure 6: Bottom-Layer Recommended Layout
MPM3570E Rev. 1.0
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MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
TYPICAL APPLICATION
VIN
4.5-75VDC
VIN
CIN
2.2µF
VOUT
MPM3570E
POK
POK
EN
EN
VOUT
RFB1
0
FB
1.0V
COUT
22µF
FB
GND
GND
Figure 7: Typical Application Circuit with 1.0V Output
VIN
4.5-75VDC
VIN
CIN
2.2µF
VOUT
MPM3570E
POK
POK
EN
EN
VOUT
RFB1
634k
FB
1.8V
COUT
22µF
FB
GND
GND
Figure 8: Typical Application Circuit with 1.8V Output
VIN
4.5-75VDC
VIN
CIN
2.2µF
VOUT
MPM3570E
POK
POK
EN
EN
FB
GND
VOUT
RFB1
2.2M
2.5V
COUT
22µF
FB
GND
Figure 9: Typical Application Circuit with 2.5V Output
MPM3570E Rev. 1.0
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3/1/2019
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MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
VIN
4.5-75VDC
VIN
CIN
2.2µF
VOUT
MPM3570E
POK
POK
EN
EN
COUT
22µF
FB
VOUT
3.3V
FB
GND
GND
Figure 10: Typical Application Circuit with 3.3V Output
VIN
4.5-75VDC
POK
VIN
CIN
2.2µF
VOUT
MPM3570E
POK
COUT
22µF
FB
VOUT
5V
FB
RFB2
698k
EN
EN
GND
GND
Figure 11: Typical Application Circuit with 5V Output
MPM3570E Rev. 1.0
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MPM3570E – ULTRA LOW EMI, 75V INPUT, 0.3A STEP-DOWN POWER MODULE W/ INTEGRATED INDUCTOR
PACKAGE INFORMATION
PACKAGE OUTLINE DRAWING FOR 8L MODULE (10X10)
LGA-8 (10mmx10mmx4.2mm)
PIN 1 ID
0.40x45° TYP.
PIN 1 ID
MARKING
PIN 1 ID
INDEX AREA
TOP VIEW
BOTTOM VIEW
SIDE VIEW
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) DRAWING IS NOT TO SCALE.
RECOMMENDED LAND PATTERN
NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third
party 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.
MPM3570E Rev. 1.0
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3/1/2019
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