MPM3570E [MPS]
Ultra Low EMI, 75V Input, 0.3A Step-Down Power Module with Integrated Inductor;
| 型号： | MPM3570E |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | Ultra Low EMI, 75V Input, 0.3A Step-Down Power Module with Integrated Inductor |
| 文件： | 总20页 (文件大小：875K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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).
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
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
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
simplified
board
design,
layout,
and
manufacturing requirements.
Ultra-high efficiency is achieved through
synchronous
techniques,
rectification
especially
and
under
control
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 over-
current protection (OCP), under-voltage lockout
(UVLO), and thermal shutdown.
APPLICATIONS
Automotive Systems
Industrial Supplies
Telecom and Networking Systems
Distributed Power and POL Systems
The MPM3570E requires a minimal number of
external components and is available in a
compact LGA8 (10mmx10mmx4.2mm) package.
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
Efficiency
VOUT=3.3V
VOUT
3.3V
VOUT
VIN
4.5-75VDC
VIN
POK
EN
CIN
COUT
90
85
80
75
70
65
60
MPM3570E
FB
FB
POK
EN
55
50
45
40
VIN=24V,VO=3.3V
VIN=36V,VO=3.3V
VIN=48V,VO=3.3V
GND
GND
0.001
0.01
0.1
1
LOAD CURRENT (A)
MPM3570E Rev. 1.0
3/1/2019
www.MonolithicPower.com
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© 2019 MPS. All Rights Reserved.
1
ORDERING INFORMATION
Part Number*
Package
Top Marking
MPM3570EGLD
LGA-8 (10mmx10mmx4.2mm)
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
8
7
6
5
1
2
3
4
VIN
EN
FB
GND
GND
GND
POK
VOUT
LGA-8 (10mmx10mm)
MPM3570E Rev. 1.0
3/1/2019
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2
PIN FUNCTIONS
PIN #
Name
Description
1
EN
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.
2
FB
3, 6, 7
4
GND
POK
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.
5
8
VOUT
VIN
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)
VIN................................................-0.3V to +80V
All other pins................................-0.3V to +6.0V
Thermal Resistance (4)
LGA-8 (10mmx10mm)........... 50....... 20... °C/W
θJA θJC
NOTES:
(2)
Continuous power dissipation (TA = +25°C)
1) Absolute maximum ratings are rated under room temperature
unless otherwise noted. Exceeding these ratings may
damage the device.
LGA8 (10mmx10mmx4.2mm).................... 2.5W
Junction temperature ................................150°C
Lead temperature .....................................260°C
Storage temperature.................. -65°C to 150°C
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-to-
ambient 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.
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
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
3/1/2019
www.MonolithicPower.com
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3
ELECTRICAL CHARACTERISTICS
VIN = 12V, External CIN=2x4.7μF, COUT=2x22μF, TA = -40C to +125C, unless otherwise noted.
Parameters
Symbol Condition
Min
Typ
Max
Units
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
VIN
4.5
75
V
IIN-MAX
IIN
IOUT = 0.3A, VOUT = 3.3V
110
15
mA
µA
µA
VEN = 0V
25
40
IIN
Enabled, no load, VOUT = 3.3V
18
3.85
3.35
4.2
4.5
V
V
3.75
4.15
VOUT
Via an external FB resistor
1.0
3.3
5.0
V
Output 3.3V, over all supply
voltage, load current, TA=25C
-2.0
+2.0
%
(5)
Output voltage precision
Output 3.3V, over all supply
voltage, load current and
temperature range
-3.0
+3.0
%
Line regulation (VIN = 4.5V to
75V, IOUT =0A), TA=25C
-2.0
-2.0
-2.0
-2.0
+2.0
+2.0
+2.0
+2.0
%
%
%
%
Output regulation (VOUT=3.3V)
(5)
Load regulation (IOUT = 0A to
0.3A), TA=25C
Line regulation (VIN = 4.5V to
75V, IOUT = 0A), TA=25C
(5)
Output regulation (VOUT=5V)
Load regulation (IOUT = 0A to
0.3A), TA=25C
mV
mV
mV
mV
A
30
25
30
25
VIN = 12V, Iout=0.3A, TA=25C
VIN = 24V, Iout=0.3A, TA=25C
VIN = 12V, Iout=0.3A, TA=25C
VIN = 24V, Iout=0.3A, TA=25C
(5)
VOUT (AC)
Output ripple (VOUT=3.3V)
(5)
VOUT (AC)
IOUT
Output ripple (VOUT=5V)
Output current range
0
0.3
MPM3570E Rev. 1.0
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3/1/2019
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© 2019 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, External CIN=2×4.7μF, COUT=2×22μF, TA = -40C to +125C, unless otherwise noted.
Parameters
Symbol Condition
Min
Typ
Max
Units
Output Turn-On Delay and Rise Time
IOUT = 0A, from EN high to
10% of the rated VOUT
Turn-on delay time
TDELAY
0.9
1.4
ms
ms
IOUT = 0A, from 10% to 90%
of the rated VOUT
Rise time
TRISE
Efficiency
%
%
%
%
85.5
85.2
88.5
88.2
VIN=12V, IOUT =0.15A,TA=25C
VIN=24V, IOUT =0.15A,TA=25C
VIN=12V, IOUT =0.15A,TA=25C
VIN=24V, IOUT =0.15A,TA=25C
(5)
η
η
Efficiency (VOUT = 3.3V)
(5)
Efficiency (VOUT = 5V)
Frequency
IOUT = 0.3A, VOUT = 3.3V,
TA=25C
140
165
kHz
kHz
(5)
fSW
Switching frequency
IOUT = 0.3A, VOUT = 5V,
TA=25C
EN (Active High)
EN input rising threshold
EN input falling threshold
EN threshold hysteresis
POK
VEN-RISING
VEN-FALLING
VEN-HYS
1.35
1.1
1.6
1.2
400
1.85
1.3
V
V
mV
POK rising threshold
POK falling threshold
POK deglitch time
POKVth-Rising
POKVth-Falling
tPOK
86%
80%
90%
84%
40
94%
88%
VFB-REF
VFB-REF
µs
POK default voltage
Thermal Protection
VPOK
VOUT = 3.3V
3.28
V
(5)
TSD
175
20
°C
°C
Thermal shutdown
Thermal shutdown
TSD-HYS
(5)
hysteresis
Note:
5) Derived from bench characterization, not tested in production.
MPM3570E Rev. 1.0
3/1/2019
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5
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VOUT = 3.3V, External CIN=2x4.7μF, COUT=2x22μF, TA = 25ºC, unless otherwise noted.
Efficiency
VOUT=3.3V
Efficiency
VOUT=5.5V
90
85
80
75
70
65
60
55
50
45
40
90
85
80
75
70
65
60
55
50
45
40
VIN=24V,VO=3.3V
VIN=36V,VO=3.3V
VIN=48V,VO=3.3V
VIN=24V,VO=5V
VIN=36V,VO=5V
VIN=48V,VO=5V
0.001
0.01
0.1
1
0.001
0.01
0.1
1
LOAD CURRENT (A)
LOAD Current (A)
Line Regulation vs. Vin
Line Regulation vs. Vin
1
0.8
0.6
0.4
0.2
0
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
-0.2
-0.4
-0.6
-0.8
-1
VO=3.3V,IO=0.15A
VO=3.3V,IO=0.3A
VO=5V,IO=0.15A
VO=5V,IO=0.3A
0
20
40
60
80
0
20
40
60
80
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Load Regulation vs. Iout
Load Regulation vs. Iout
2
1.5
1
2
1.5
1
VIN=24V,VO=3.3V
VIN=36V,VO=3.3V
VIN=48V,VO=3.3V
VIN=24V,VO=5V
VIN=36V,VO=5V
VIN=48V,VO=5V
0.5
0
0.5
0
-0.5
-1
-0.5
-1
-1.5
-2
-1.5
-2
0
0.1
0.2
0.3
0
0.1
0.2
0.3
LOAD CURRENT (A)
LOAD CURRENT (A)
MPM3570E Rev. 1.0
3/1/2019
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TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VOUT = 3.3V, External CIN=2x4.7μF, COUT=2x22μF, TA = 25ºC, unless otherwise noted.
Thermal Derating
0.5
0.4
0.3
0.2
0.1
0
20
40
60
80
100
120
AMBIENT TEMPERATURE (°C)
MPM3570E Rev. 1.0
3/1/2019
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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
3/1/2019
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TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VOUT = 3.3V, External CIN=2x4.7μF, COUT=2x22μF, TA = 25ºC, unless otherwise noted.
Vo Ripple
IOUT=0A
Vo Ripple
IOUT=0.3A
CH1:
VOUT/AC
CH1:
VOUT/AC
20mV/div.
20mV/div.
CH4: IOUT
1A/div.
CH4: IOUT
100mA/div.
40ms/div.
4µs/div.
Vin Start-Up
IOUT=0A
Vin Start-Up
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
CH4: IOUT
100mA/div.
200mA/div.
1ms/div.
1ms/div.
Vin Shutdown
IOUT=0A
Vin Shutdown
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
CH4: IOUT
200mA/div.
200mA/div.
20ms/div.
4ms/div.
MPM3570E Rev. 1.0
3/1/2019
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TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, External CIN=2x4.7μF, COUT=2x22μF, TA = 25ºC, unless otherwise noted.
EN Start-Up
IOUT=0A
EN Start-Up
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
CH4: IOUT
200mA/div.
200mA/div.
1ms/div.
1ms/div.
EN Shutdown
IOUT=0A
EN Shutdown
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
CH4: IOUT
200mA/div.
200mA/div.
200ms/div.
1ms/div.
EN On/Off Cycle
IOUT=0A
EN On/Off Cycle
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
CH4: IOUT
200mA/div.
200mA/div.
1s/div.
1s/div.
MPM3570E Rev. 1.0
3/1/2019
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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
3/1/2019
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BLOCK DIAGRAM
EMI
FILTER
Current
Sense
Amplifer
VIN
CIN
REN
VOUT
Current
Limit
RSEN
Comparator
Regulator
Reference
POK
ILIMIT
GND
BST
BIAS
VCC
3Mohm
CVCC
HS
Driver
85% or 90%VREF
L 22uH
Zero Current
Detector
VOUT
FB
POK
Comparato
r
CONTROL
LOGIC
VCC
COUT
EN
LS
Driver
Internal
FB
Resistor
Soft-Start
LOOP
Comparator
CSS
Figure 1: Functional Block Diagram
MPM3570E Rev. 1.0
3/1/2019
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OPERATION
The MPM3570E is
a
fully integrated,
short-circuit recovery. When the short circuit is
removed, the VSS ramps up as if it is a fresh soft-
start process.
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.
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.
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.
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.
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.
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.
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.
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.
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
MPM3570E Rev. 1.0
3/1/2019
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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
RFB1
VOUT
FB
RFB_up
1.2M
VIN
REN_up
1M
EN
RFB_down
523k
RFB2
REN_down
RUVLO
GND
3M
GND
Figure 2: Adjusting Output with FB Resistors
Figure 3: Adjustable UVLO using EN Pin
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
The resistor for adjusting the UVLO can be
calculated with Equation (3):
1600
(3)
RUVLO(k)
V 2.13
over 3.3V, connect an appropriate resistor (RFB2
)
IN
between FB and GND. These two resistors can
be calculated with Equation (1) and Equation (2):
The calculated resistance may need fine-tuning
during the bench test.
1200(VOUT 1)
(1)
RFB1(k)
ꢀ, VOUT 3.3V
Input Capacitor
3.3 VOUT
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.
1200
(2)
RFB2(k)
, VOUT 3.3V
VOUT 3.3
The calculated resistance may need fine-tuning
during the bench test. For typical applications,
Table 1 provides the RFB values for different
output voltages.
Ceramic capacitors with low ESR are
recommended for best performance. The
Table 1: RFB Values to Typical VOUT
VOUT (V)
1.0
R
FB1 (kΩ)
R
FB2 (kΩ)
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.
0
NS
1.2
110
324
634
2200
NS
NS
1.5
NS
1.8
NS
2.5
NS
3.3
NS
5
NS
698
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To achieve a smaller solution size, choose a
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.
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 Murata GRM21BC71E106KE11
10μF 25V,X5R,0603 TDK C1608X5R1E106M080AC
TDK C3225X7R1H106M250AC
Table 3: Recommended Output Capacitors
Value Description Vendor
10μF 10V,X7R,0805 Murata GRM21BR71A106KE51
10μF 10V,X7R,0805 TDK C2012X7R1A106K125AC
22μF 10V,X7T,0805 Murata GRM21BD71A226ME44
22μF 10V,X7S,0805 TDK C2012X7S1A226M125AC
47μF 10V,X5R,0805 Murata GRM21BR61A476ME15
47μF 10V,X5R,0805 TDK C2012X5R1A476M125AC
Part Number
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):
VOUT
VOUT
(4)
ICIN IOUT
(1
)
V
V
IN
IN
The output voltage ripple can be estimated with
Equation (8):
The worst-case condition occurs at VIN = 2VOUT
,
where:
VOUT
V
1
(1 OUT )(RESR
(8)
)
VOUT
IOUT
fSW L
V
8fSW COUT
IN
ICIN
(5)
2
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):
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.
VOUT
VOUT
(9)
VOUT
(1
)
8fSW2 LCOUT
V
IN
EMI Considerations
Estimate the input voltage ripple with Equation
(6):
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).
IOUT
V
VOUT
V
OUT (1
)
(6)
IN
FSW CIN
V
V
IN
IN
The worst-case condition occurs at VIN = 2VOUT
,
where:
IOUT
4 FSW CIN
1
(7)
V
IN
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.
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2.2µH
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.
12V
Input (+)
Input (-)
MPM3570E
Load
10µF
22µF
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
recommended filter inductors.
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:
4
contains a list of
Table 4: Recommended Filter Inductors
Value
Description
Vendor
Part Number
2.2μH 0.75A,300mΩ,0603 Murata LQM18PN2R2MFRL
1. Use large copper areas for power planes
(VIN, VOUT, and GND) to minimize
conduction loss and thermal stress.
Taiyo
2.2μH 0.65A ,300mΩ,0603
CKP1608D2R2M-T
Yuden
Input Fusing
2. Use multiple vias to connect the power
planes to the internal layers.
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 current-
limited. For safety, we recommend a fast blow
fuse installed in the ungrounded input supply line.
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.
Thermal Considerations
4. Place the ceramic input and output capacitors
close to the module pins to minimize high
frequency noise.
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
5. Keep the connections as short and wide as
possible.
required to operate in
a
high ambient
6. Place RFB as close to FB as possible.
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.
The thermal shutdown temperature of the
MPM3570E is 175°C, so carefully consider the
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Figure 5: Top-Layer Recommended Layout
Figure 6: Bottom-Layer Recommended Layout
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TYPICAL APPLICATION
VOUT
1.0V
VOUT
VIN
4.5-75VDC
VIN
POK
EN
CIN
2.2µF
COUT
22µF
RFB1
0
MPM3570E
FB
FB
POK
EN
GND
GND
Figure 7: Typical Application Circuit with 1.0V Output
VOUT
1.8V
VOUT
VIN
4.5-75VDC
VIN
POK
EN
CIN
2.2µF
COUT
22µF
RFB1
634k
MPM3570E
FB
FB
POK
EN
GND
GND
Figure 8: Typical Application Circuit with 1.8V Output
VOUT
2.5V
VOUT
VIN
4.5-75VDC
VIN
POK
EN
CIN
2.2µF
COUT
22µF
RFB1
2.2M
MPM3570E
FB
FB
POK
EN
GND
GND
Figure 9: Typical Application Circuit with 2.5V Output
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VOUT
3.3V
VOUT
VIN
4.5-75VDC
VIN
POK
EN
COUT
22µF
CIN
2.2µF
MPM3570E
FB
FB
POK
EN
GND
GND
Figure 10: Typical Application Circuit with 3.3V Output
VOUT
5V
VOUT
VIN
4.5-75VDC
VIN
POK
EN
COUT
22µF
CIN
2.2µF
MPM3570E
FB
FB
POK
EN
RFB2
698k
GND
GND
Figure 11: Typical Application Circuit with 5V Output
MPM3570E Rev. 1.0
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PACKAGE INFORMATION
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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