MPM3509B
36V, 0.6A Module, Synchronous,
Step-Down Converter with an
Integrated Inductor, AEC-Q100 Qualified
DESCRIPTION
FEATURES
The MPM3509B is a synchronous, rectified,
step-down converter power module with built-in
power MOSFETs, inductors, and capacitors.
The MPM3509B offers a very compact solution
and requires only four external components to
achieve 0.6A of continuous output current with
excellent load and line regulation over a wide
input supply range. The MPM3509B operates
with a 400kHz switching frequency to achieve a
fast load transient response.
Full protection features include over-current
protection (OCP) and thermal shutdown.
The MPM3509B eliminates
manufacturing
risks
while
improving time-to-market.
design and
dramatically
The MPM3509B is available in a space-saving
QFN-17 (3mmx5mmx1.6mm) package.
Complete Switch-Mode Power Supply
Wide 4V to 36V Operating Input Range
0.6A Continuous Load Current
90mΩ/50mΩ Low RDS(ON) Internal Power
MOSFETs
Fixed 400kHz Switching Frequency
410kHz to 2.2MHz Frequency Sync
Forced Continuous Conduction Mode
(FCCM)
Power Good (PG) Indicator
Over-Current Protection (OCP) with ValleyCurrent Detection and Hiccup Mode
Thermal Shutdown
Output Adjustable from 0.807V
CISPR25 Class 5 Compliant
Available in a QFN-17 (3mmx5mmx1.6mm)
Package
Available in a Wettable Flank Package
Available in AEC-Q100 Grade 1
APPLICATIONS
Automotive Infotainment
Automotive Clusters
Automotive Telematics
Medical and Imaging Equipment
Distributed Power Systems
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive.
For MPS green status, please visit the MPS website under Quality
Assurance. “MPS”, the MPS logo, and “Simply, Easy Solutions” are
registered trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
Efficiency vs. Load Current
VOUT = 3.3V
100
4V to 36V
C1
EN/
SYNC
MPM3509B
OUT
VOUT
C2
R1
EN/SYNC
FB
R2
90
80
EFFICIENCY (%)
IN
VIN
70
60
50
40
VIN=5V
VIN=12V
VIN=24V
VIN=36V
30
20
PGND
AGND
10
0
10
100
LOAD CURRENT (mA)
MPM3509B Rev. 1.0
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6/2/2020
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1
MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
ORDERING INFORMATION
Part Number*
Package
Top Marking
MSL Rating**
MPM3509BGQVE-AEC1***
QFN-17
(3mmx5mmx1.6mm)
See Below
3
* For Tape & Reel, add suffix –Z (e.g. MPM3509BGQVE-AEC1–Z).
** Moisture Sensitivity Level Rating.
*** Wettable Flank.
TOP MARKING
MP: MPS prefix
Y: Year code
W: Week code
3509B: Part number
LLL: Lot number
E: Package suffix
E: Wettable flank
M: Module
PACKAGE REFERENCE
TOP VIEW
IN
16
PG
1
EN/
SYNC
2
15
PGND
14
PGND
13
BST
NC
3
VCC
4
17
FB
AGND
5
12
SW
SW
6
11
OUT
SW
7
10
OUT
SW
8
9
OUT
NC pin must
be left floating
QFN-17 (3mmx5mmx1.6mm)
MPM3509B Rev. 1.0
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6/2/2020
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2
MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
PIN FUNCTIONS
Pin #
Name
1
PG
2
EN/
SYNC
3
FB
4
VCC
5
AGND
6, 7, 8,
12
SW
9, 10,
11
OUT
13
BST
14, 15
PGND
16
IN
17
NC
Description
Power good indicator. PG is an open-drain structure.
Enable/sync. Pull EN/SYNC above the specified threshold (1.45V) to enable the
MPM3509B. Float EN/SYNC or pull it below the specified threshold (1V) to disable the
MPM3509B. Apply an external clock to EN/SYNC to change the switching frequency.
Feedback. To set the output voltage, connect FB to the tap of an external resistor divider
from the output to AGND. The feedback threshold voltage is 0.807V. The frequency
foldback comparator lowers the oscillator frequency when the FB voltage is below 400mV.
This prevents current limit runaway during a short-circuit fault. Place the resistor divider as
close to FB as possible. Avoid placing vias on the FB traces.
Internal 4.9V LDO output. An internal circuit integrates the LDO output capacitor, so
VCC does not require an external capacitor.
Analog ground. Reference ground of the logic circuit. AGND is connected to PGND
internally. Do not add external connections to PGND.
Switch output. The SW pins are not required to be connected. However, it is
recommended to place a large copper plane on pin 6, pin 7, and pin 8 to improve heat
sinking.
Power output. Connect the load to OUT. An output capacitor is required.
Bootstrap. The bootstrap capacitor is integrated internally. BST does not require external
connections.
Power ground. PGND is the reference ground of the power device, and requires careful
consideration while designing the PCB layout. For the best results, connect PGND with
copper pours and vias.
Supply voltage. IN supplies power to the internal MOSFET and regulator. The
MPM3509B operates from a 4V to 36V input rail. A low-ESR, low-inductance capacitor is
required to decouple the input rail. Place the input capacitor very close to IN, and connect
it with wide PCB traces and multiple vias.
No connection. NC must be left floating.
MPM3509B Rev. 1.0
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6/2/2020
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
θJA θJC
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance
VIN ................................................ -0.3V to +40V
VSW, VOUT ..............................-0.3V to VIN + 0.3V
VBST .....................................................VSW + 6V
All other pins .............................. -0.3V to +6V (2)
Continuous power dissipation (TA = 25°C) (3) (5)
..................................................................3.9W
Junction temperature ............................... 150°C
Lead temperature .................................... 260°C
Storage temperature ................ -65°C to +150°C
QFN-17 (3mmx5mmx1.6mm)
JESD51-7 (4)... ........................ 46 ...... 10 ... °C/W
EVM3509B-QV-00A (5)..............32......1.6...°C/W
Notes:
1)
2)
3)
Electrostatic Discharge (ESD rating)
Human body model (HBM) ........................ ±2kV
Charged device model (CDM)…………… ±750V
Recommended Operating Conditions
Supply voltage (VIN) ........................... 4V to 36V
Output voltage (VOUT) ......... 0.807V to VIN x DMAX
Operating junction temp (TJ) .... -40°C to +125°C
4)
5)
Absolute maximum ratings are rated under room temperature
unless otherwise noted. Exceeding these ratings may
damage the device.
For details on EN/SYNC’s absolute maximum rating, see the
EN/SYNC section on page 16.
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 regulator to go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
Measured on JESD51-7, 4-layer PCB.
Measured on MPS standard EVB, 6.4cmx6.4cm, 2-oz. thick
copper, 4-layer PCB.
MPM3509B Rev. 1.0
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6/2/2020
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
ELECTRICAL CHARACTERISTICS
VIN = 12V, TJ = -40°C to +125°C, typical values are at TJ = 25°C, unless otherwise noted.
Parameter
Shutdown supply current
Symbol
IIN
Quiescent supply current
IQ
HS switch on resistance
LS switch on resistance
Inductor DC resistance
Switch leakage
Current limit (6)
Low-side valley current
limit
Reverse current limit
Oscillator frequency
Foldback frequency
during soft start (6)
Maximum duty cycle
Minimum on time (6)
HSRDS(ON)
LSRDS(ON)
LDCR
SW LKG
ILIMIT
VEN/SYNC = 0V, VSW = 12V
40% duty cycle
Min
0.7
1
mA
90
50
165
165
105
2
7.0
1.5
2.5
3.5
A
1.2
300
3
400
500
A
kHz
VFB = 200mV
DMAX
tON_MIN
VFB = 700mV
92
TJ = 25°C
TJ = -40°C to +125°C
VFB = 820mV
795
790
IFB
Units
μA
5.0
fFB
Feedback current
EN/SYNC rising
threshold
EN/SYNC falling
threshold
EN/SYNC input current
Max
8
3.0
VFB = 700mV
VFB
Typ
mΩ
mΩ
mΩ
μA
A
fSW
Feedback voltage
EN/SYNC turn-off delay
EN/SYNC frequency
range
VIN under-voltage lockout
rising threshold
VIN under-voltage lockout
threshold hysteresis
PG rising threshold
PG falling threshold
PG rising delay
PG falling delay
PG sink current capability
PG leakage current
VCC regulator
VCC load regulation
Soft-start time
Thermal shutdown (6)
Thermal hysteresis (6)
Condition
VEN/SYNC = 0V
VEN/SYNC = 2V, VFB = 1V,
no switching
VBST-SW = 5V
VCC = 5V
125
kHz
95
40
807
807
10
819
827
50
%
ns
mV
mV
nA
VEN_RISING
1.2
1.45
1.7
V
VEN_FALLING
0.8
1
1.3
V
5
10
μA
IEN
VEN/SYNC = 2V
ENTD_OFF
410
INUVVTH
3
INUVHYS
PGVTH_HI
PGVTH_LO
PGTD_RISING
PGTD_FALLING
VPG
IPG_LEAK
VCC
tSS
μs
3
2200
kHz
3.8
V
3.5
330
0.83
0.78
40
30
0.88
0.83
90
55
4.6
4.9
1.5
1.7
170
20
Sink 4mA
ICC = 5mA
VOUT from 10% to 90%
0.4
mV
0.93
0.88
160
95
0.4
100
5.2
4
3
VFB
VFB
μs
μs
V
nA
V
%
ms
°C
°C
Note:
6) Derived from the bench characterization. Not tested in production.
MPM3509B Rev. 1.0
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6/2/2020
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
TYPICAL CHARACTERISTICS
VIN=12V, TJ=-40°C to +125°C, unless otherwise noted.
IQ vs. Temperature
VFB vs. Temperature
1.0
0.820
0.815
0.8
VFB (V)
IQ (mA)
0.9
0.810
0.7
0.805
0.6
0.800
0.5
-50
-25
0
25
50
75 100
TEMPERATURE (ºC)
-50
125
25
50
75
100
125
VIN Threshold vs. Temperature
3.6
1.6
VIN THRESHOLD (V)
1.5
EN UVLO (V)
0
TEMPERATURE (ºC)
EN UVLO Threshold vs. Temperature
1.4
1.3
EN UVLO Rising
1.2
EN UVLO Falling
1.1
1.0
0.9
3.5
3.4
VIN UVLO Rising
3.3
VIN UVLO Falling
3.2
3.1
-50
-25
0
25
50
75
TEMPERATURE (ºC)
100
125
-50
-25
0
25
50
75
100
125
TEMPERATURE (ºC)
Peak Current Limit vs. Temperature
Valley Current Limit vs. Temperature
6.0
2.6
5.5
2.5
IVALLEY (A)
IPEAK (A)
-25
5.0
4.5
2.4
2.3
4.0
-50
-25
0
25
50
75
TEMPERATURE (ºC)
100
125
2.2
-50
-25
0
25
50
75 100
TEMPERATURE (ºC)
MPM3509B Rev. 1.0
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6
MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
TYPICAL CHARACTERISTICS (continued)
VIN=12V, TJ=-40°C to +125°C, unless otherwise noted.
Reverse Current Limit vs.
Temperature
VCC vs. Temperature
3.1
5.00
4.95
VCC (V)
IREVERSE (A)
3.0
2.9
2.8
4.90
4.85
2.7
4.80
2.6
-50
-25
0
25
50
75
100
-50
125
-25
25
50
75
100
125
TEMPERATURE (ºC)
TEMPERATURE (ºC)
fSW vs. Temperature
RHS_ON vs. Temperature
130
410
120
405
400
RHS_ON (mΩ)
fSW (kHz)
0
395
390
385
110
100
90
80
380
-50
-25
0
25
50
75
100
125
TEMPERATURE (ºC)
70
-50
-25
0
25
50
75
100
125
TEMPERATURE (ºC)
RLS_ON vs. Temperature
80
RLS_ON (mΩ)
70
60
50
40
-50
-25
0
25
50
75
100
125
TEMPERATURE (ºC)
MPM3509B Rev. 1.0
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VOUT = 3.3V, fSW = 400kHz, TA = 25°C, unless otherwise noted.
Efficiency vs. Load Current
Efficiency vs. Load Current
VOUT = 5V
100
100
90
90
80
80
EFFICIENCY (%)
EFFICIENCY (%)
VOUT = 3.3V
70
60
50
40
VIN=5V
VIN=12V
VIN=24V
VIN=36V
30
20
10
100
LOAD CURRENT (mA)
60
50
40
30
10
0
600
10
Load Regulation
100
LOAD CURRENT (mA)
600
Load Regulation
VOUT = 3.3V
VOUT = 5V
0.03
0.03
LOAD REGULATION (%)
LOAD REGULATION (%)
VIN=12V
VIN=24V
VIN=36V
20
0
10
70
0.02
0.01
0.00
VIN=5V
VIN=12V
VIN=24V
VIN=36V
-0.01
-0.02
-0.03
1
10
600
100
LOAD CURRENT (mA)
0.02
0.01
0.00
-0.01
VIN=12V
VIN=24V
VIN=36V
-0.02
-0.03
1
10
100
LOAD CURRENT (mA)
600
LINE REGULATION (%)
Line Regulation
0.05
0.04
0.03
0.02
0.01
0.00
-0.01
-0.02
-0.03
-0.04
-0.05
Io=0A
Io=0.3A
Io=0.6A
5
10
15
20
25
VIN (V)
30
35
40
MPM3509B Rev. 1.0
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6/2/2020
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, fSW = 400kHz, TA = 25°C, unless otherwise noted.
Steady State
Steady State
IOUT = 0A
IOUT = 0.6A
CH2:
VOUT/AC
50mV/div.
CH2:
VOUT/AC
50mV/div.
CH3: VIN
5V/div.
CH1: VSW
5V/div.
CH3: VIN
5V/div.
CH1: VSW
5V/div.
CH4: IL
1A/div.
CH4: IL
1A/div.
2μs/div.
2μs/div.
Start-Up through VIN
Start-Up through VIN
IOUT = 0A
IOUT = 0.6A
CH3: VIN
5V/div.
CH2: VOUT
2V/div.
R1: PG
5V/div.
CH1: VSW
10V/div.
CH3: VIN
5V/div.
CH2: VOUT
2V/div.
R1: PG
5V/div.
CH1: VSW
10V/div.
CH4: IL
CH4: IL
1A/div.
1A/div.
2ms/div.
2ms/div.
Shutdown through VIN
Shutdown through VIN
IOUT = 0A
IOUT = 0.6A
CH3: VIN
5V/div.
CH3: VIN
5V/div.
CH2: VOUT
2V/div.
R1: PG
CH2: VOUT
2V/div.
R1: PG
5V/div.
CH1: VSW
10V/div.
5V/div.
CH1: VSW
10V/div.
CH4: IL
1A/div.
CH4: IL
1A/div.
20ms/div.
20ms/div.
MPM3509B Rev. 1.0
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6/2/2020
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, fSW = 400kHz, TA = 25°C, unless otherwise noted.
Start-Up through EN
Start-Up through EN
IOUT = 0A
IOUT = 0.6A
CH3: VEN
2V/div.
CH2: VOUT
2V/div.
R1: PG
5V/div.
CH1: VSW
10V/div.
CH3: VEN
2V/div.
CH2: VOUT
2V/div.
R1: PG
CH4: IL
1A/div.
CH4: IL
1A/div.
5V/div.
CH1: VSW
10V/div.
1ms/div.
1ms/div.
Shutdown through EN
Shutdown through EN
IOUT = 0A
IOUT = 0.6A
CH3: VEN
2V/div.
CH2: VOUT
2V/div.
R2: PG
5V/div.
CH1: VSW
10V/div.
CH3: VEN
2V/div.
CH2: VOUT
2V/div.
R2: PG
5V/div.
CH1: VSW
10V/div.
CH4: IL
1A/div.
CH4: IL
1A/div.
1s/div.
400μs/div.
SCP Entry
SCP Entry
IOUT = 0A
IOUT = 0.6A
CH3: VPG
5V/div.
CH3: VPG
5V/div.
CH2: VOUT
2V/div.
CH2: VOUT
2V/div.
CH1: VSW
10V/div.
CH1: VSW
10V/div.
CH4: IL
5A/div.
CH4: IL
5A/div.
4ms/div.
4ms/div.
MPM3509B Rev. 1.0
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6/2/2020
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, fSW = 400kHz, TA = 25°C, unless otherwise noted.
SCP Recovery
SCP Recovery
IOUT = 0A
IOUT = 0.6A
CH3: VPG
5V/div.
CH3: VPG
5V/div.
CH2: VOUT
2V/div.
CH2: VOUT
2V/div.
CH1: VSW
10V/div.
CH1: VSW
10V/div.
CH4: IL
5A/div.
CH4: IL
5A/div.
4ms/div.
4ms/div.
SCP Steady
Load Transient
IOUT = 0.6A
IOUT = 0A to 0.6A
CH3: VPG
5V/div.
CH2: VOUT
2V/div.
CH2:
VOUT/AC
50mV/div.
CH1: VSW
10V/div.
CH4: IOUT
200mA/div.
CH4: IL
5A/div.
4ms/div.
100μs/div.
MPM3509B Rev. 1.0
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6/2/2020
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, fSW = 400kHz, TA = 25°C, unless otherwise noted.
Cold Crank
Cold Crank
VIN = 12V to 3.3V to 5V, IOUT = 0A
VIN = 12V to 3.3V to 5V, IOUT = 0.6A
CH2: VOUT
2V/div.
CH2: VOUT
2V/div.
CH3: VIN
5V/div.
CH3: VIN
5V/div.
CH1: SW
5V/div.
CH1: SW
5V/div.
CH4: IOUT
CH4: IL
1A/div.
500mA/div.
20ms/div.
20ms/div.
Load Dump
VIN Ramp Up and Down
VIN = 12V to 36V to 12V, IOUT = 0.6A
VIN = 0V to 5V to 0V, IOUT = 0A
CH2: VOUT
2V/div.
CH1: VIN
1V/div.
CH3: VIN
10V/div.
CH2: VOUT
2V/div.
CH1: SW
20V/div.
CH4: IL
1A/div.
100ms/div.
1s/div.
VIN Ramp Down and Up
VIN Ramp Down and Up
IOUT = 0A
IOUT = 0.6A
CH3: VIN
5V/div.
CH3: VIN
5V/div.
4V
4V
CH1: SW
10V/div.
CH1: SW
10V/div.
CH2: VOUT
2V/div.
CH2: VOUT
2V/div.
CH4: IL
1A/div.
CH4: IL
1A/div.
10s/div.
10s/div.
MPM3509B Rev. 1.0
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6/2/2020
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, fSW = 400kHz, TA = 25°C, with EMI filters, unless otherwise noted. (7)
CISPR25 Class 5 Peak Radiated
Emissions
CISPR25 Class 5 Average Radiated
Emissions
150kHz to 108MHz
150kHz to 108MHz
CISPR25 CLASS 5 LIMITS
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
-5
-10
-15
-20
CISPR25 CLASS 5 LIMITS
AVERAGE CONDUCTED EMI (dBuV)
PEAK CONDUCTED EMI (dBuV)
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
-5
-10
-15
-20
NOISE FLOOR
1
0.1
10
Frequency (MHz)
108
NOISE FLOOR
CISPR25 Class 5 Peak Radiated
Emissions
150kHz to 30MHz
108
150kHz to 30MHz
60
55
55
CISPR25 CLASS 5 LIMITS
50
AVERAGE RADIATED EMI (dBuV/m)
50
PEAK RADIATED EMI (dBuV/m)
10
Frequency (MHz)
CISPR25 Class 5 Average Radiated
Emissions
60
45
40
35
30
25
20
15
10
NOISE FLOOR
5
45
40
35
CISPR25 CLASS 5 LIMITS
30
25
20
15
10
5
0
0
-5
-5
-10
-10
1
0.1
Horizontal, 30MHz to 200MHz
Horizontal, 30MHz to 200MHz
55
HORIZONTAL POLARIZATION
50
30
10
Frequency (MHz)
CISPR25 Class 5 Average Radiated
Emissions
55
HORIZONTAL POLARIZATION
50
45
CISPR25 CLASS 5 LIMITS
AVERAGE RADIATED EMI (dBuV/m)
45
1
0.1
30
10
Frequency (MHz)
NOISE FLOOR
CISPR25 Class 5 Peak Radiated
Emissions
PEAK RADIATED EMI (dBuV/m)
1
0.1
40
35
30
25
20
15
10
NOISE FLOOR
5
40
35
30
25
15
10
5
0
0
-5
-5
30
40
50
CISPR25 CLASS 5 LIMITS
20
60
70
80
90
100
110
120
Frequency (MHz)
130
140
150
160
170
180
190
200
NOISE FLOOR
30
40
50
60
70
80
90
100 110 120
Frequency (MHz)
130
140
150
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160
170
180
190
200
13
MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, fSW = 400kHz, TA = 25°C, with EMI filters, unless otherwise noted. (7)
CISPR25 Class 5 Peak Radiated
Emissions
CISPR25 Class 5 Average Radiated
Emissions
Vertical, 30MHz to 200MHz
Vertical, 30MHz to 200MHz
55
55
VERTICAL POLARIZATION
50
45
CISPR25 CLASS 5 LIMITS
AVERAGE RADIATED EMI (dBuV/m)
PEAK RADIATED EMI (dBuV/m)
45
40
35
30
25
20
15
10
NOISE FLOOR
5
40
35
30
25
15
10
0
-5
40
50
CISPR25 CLASS 5 LIMITS
20
5
0
30
VERTICAL POLARIZATION
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
NOISE FLOOR
-5
200
30
40
50
60
70
80
90
Frequency (MHz)
CISPR25 Class 5 Peak Radiated
Emissions
Horizontal, 200MHz to 1GHz
HORIZONTAL POLARIZATION
150
160
170
180
190
200
HORIZONTAL POLARIZATION
50
45
AVERAGE RADIATED EMI (dBuV/m)
PEAK RADIATED EMI (dBuV/m)
140
Horizontal, 200MHz to 1GHz
55
45
CISPR25 CLASS 5 LIMITS
40
35
30
25
20
15
10
NOISE FLOOR
5
40
35
30
25
CISPR25 CLASS 5 LIMITS
20
15
10
5
0
0
-5
-5
200
300
400
500
600
700
800
900
1000
NOISE FLOOR
200
300
400
Frequency (MHz)
CISPR25 Class 5 Peak Radiated
Emissions
500
600
Frequency (MHz)
700
800
900
1000
CISPR25 Class 5 Average Radiated
Emissions
Vertical, 200MHz to 1GHz
Vertical, 200MHz to 1GHz
55
55
VERTICAL POLARIZATION
50
VERTICAL POLARIZATION
50
45
45
CISPR25 CLASS 5 LIMITS
AVERAGE RADIATED EMI (dBuV/m)
PEAK RADIATED EMI (dBuV/m)
130
CISPR25 Class 5 Average Radiated
Emissions
55
50
100 110 120
Frequency (MHz)
40
35
30
25
20
15
10
NOISE FLOOR
5
40
35
30
25
CISPR25 CLASS 5 LIMITS
20
15
10
5
0
0
-5
200
300
400
500
600
Frequency (MHz)
700
800
900
1000
NOISE FLOOR
-5
200
300
400
500
600
Frequency (MHz)
700
800
900
1000
Note:
7) The EMC test results are based on the typical application circuit in Figure 11 on page 23. The results are tested on the EVM3509B-QV00A.
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
FUNCTIONAL BLOCK DIAGRAM
IN
VCC
VCC
Regulator
RSEN
Current-Sense
Amplifier
0.1μF
BST
Bootstrap
Regulator
0.1μF
SW
HS
Driver
Oscillator
EN/SYNC
4.7μH
1pF
Reference
56pF 400kΩ
Current-Limit
Comparator
Comparator
On-Time
Control Logic
Control
OUT
VCC
LS
Driver
FB
10kΩ
Error
Amplifier
AGND
PG
PGND
Figure 1: Functional Block Diagram
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
OPERATION
The
MPM3509B
is
a
high-frequency,
synchronous, rectified, step-down, switch-mode
converter power module with built-in power
MOSFETs, an integrated inductor, and two
capacitors. The MPM3509B offers a very
compact solution that achieves 0.6A of
continuous output current with excellent load
and line regulation across a 4V to 36V input
supply range.
The MPM3509B operates in fixed-frequency,
peak current control mode to regulate the
output voltage. An internal clock initiates a
pulse-width modulation (PWM) cycle. The
integrated high-side power MOSFET (HS-FET)
turns on, and remains on until the current
reaches the value set by the COMP voltage
(VCOMP). When the power switch is off, it
remains off until the next clock cycle begins. If
the current in the power MOSFET does not
reach the value set by VCOMP within 95% of one
PWM period, the power MOSFET is forced off.
Internal Regulator
A 4.9V internal regulator powers most of the
internal circuitries. This regulator takes VIN and
operates in the full VIN range. When VIN
exceeds 4.9V, the output of the regulator is in
full regulation. When VIN drops below 4.9V, the
output decreases. The MPM3509B integrates
an internal decoupling capacitor, so an external
VCC output capacitor is not required.
Forced Continuous Conduction Mode
(FCCM) Operation
The MPM3509B uses forced continuous
conduction mode (FCCM) to ensure that the
part works with a fixed frequency from a noload to a full-load range. The advantage of
FCCM is the controllable frequency and lower
output ripple under light-load conditions.
Error Amplifier (EA)
The error amplifier compares the FB voltage to
the internal 0.807V reference (VREF) and
outputs a current proportional to the difference
between the two values. The output current
then charges or discharges the internal
compensation network to form VCOMP, which
controls the power MOSFET current. The
optimized internal compensation network
minimizes the external component count and
simplifies control loop design.
Under-Voltage Lockout (UVLO)
Under-voltage lockout (UVLO) protects the chip
from operating at an insufficient supply voltage.
The UVLO comparator monitors the output
voltage of the internal regulator (VCC). The
UVLO rising threshold is about 3.5V, and its
falling threshold is about 3.17V.
EN/SYNC
EN/SYNC is a control pin that turns the
regulator on and off. Drive EN/SYNC high to
turn on the regulator; drive EN/SYNC low to
turn off the regulator. An internal 500kΩ resistor
from EN/SYNC to GND allows EN/SYNC to be
floated to shut down the chip.
EN/SYNC is clamped internally using a 6.5V
series Zener diode (see Figure 2). Connecting
the EN/SYNC input to VIN through a pull-up
resistor limits the EN/SYNC input current below
100µA. For example, with 12V connected to
VIN, RPULLUP ≥ (12V - 6.5V) ÷ 100µA = 55kΩ.
Connecting EN/SYNC to a voltage source
directly without a pull-up resistor requires
limiting the amplitude of the voltage source
below 6V to prevent damage to the Zener diode.
Zener Diode
(6.5V, typically)
EN/SYNC
LOGIC
Figure 2: 6.5V Zener Diode Connection
Connect an external clock with a range of
410kHz to 2.2MHz to synchronize the internal
clock rising edge to the external clock rising
edge. The pulse wide of the external clock
signal should be below 1.7us, and the off time
of external clock signal should be below 1.9µs.
Internal Soft Start (SS)
Soft start (SS) prevents the converter output
voltage from overshooting during start-up.
When the chip starts up, the internal circuitry
generates a soft-start (VSS) voltage that ramps
up from 0V to 4.9V. When VSS is below VREF,
the error amplifier uses VSS as the reference.
When VSS exceeds VREF, the error amplifier
uses VREF as the reference. The SS time is set
to 1.7ms internally.
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
Over-Current Protection (OCP) and Hiccup
The MPM3509B has cycle-by-cycle peak
current limit protection and valley current
detection protection. The inductor current is
monitored during the HS-FET on state. If the
inductor current exceeds the current limit value
set by the COMP high-clamp voltage, the HSFET turns off immediately. The low-side
MOSFET (LS-FET) then turns on to discharge
the energy, and the inductor current decreases.
The HS-FET remains off unless the inductor
valley current drops below the valley current
limit, even if the internal clock pulses high.
voltage headroom to facilitate charging. As long
as VIN exceeds SW significantly, the bootstrap
capacitor remains charged. When the HS-FET
is on, VIN is about equal to VSW, so the
bootstrap capacitor cannot charge. When the
LS-FET is on, VIN - VSW reaches its maximum
value for fast charging. When there is no
inductor current, VSW is equal to VOUT, so the
difference between VIN and VOUT can charge the
bootstrap capacitor. The floating driver has its
own under-voltage lockout (UVLO) protection,
with a rising threshold of 2.2V and hysteresis of
150mV.
If the inductor current does not drop below the
valley current limit when the internal clock
pulses high, the HS-FET misses the clock, and
the switching frequency decreases to half the
nominal value. Both the peak and valley current
limits assist in keeping the inductor current from
running away during an overload or short-circuit
condition.
If the output voltage drops below the undervoltage (UV) threshold (typically 50% below
VREF), the MPM3509B enters hiccup mode to
periodically restart the part. Simultaneously, the
peak current limit is reached.
This protection mode is useful when the output
is dead-shorted to ground, and greatly reduces
the average short-circuit current to alleviate
thermal issues and protect the regulator. The
MPM3509B exits hiccup mode once the overcurrent condition is removed.
Thermal Shutdown
Thermal shutdown prevents the chip from
operating at exceedingly high temperatures.
When the die temperatures exceed 170°C, the
device stops switching. When the temperature
drops below its lower threshold (typically
150°C), the power supply resumes operation.
Figure 3: Internal Bootstrap Charging Circuit
Start-Up and Shutdown
If VIN exceeds its thresholds, the MPM3509B
starts up. The reference block starts first,
generating a stable reference voltage and
current. Then the internal regulator is enabled.
The regulator provides a stable supply for the
remaining circuitries.
Three events can shut down the chip: VIN going
low, EN/SYNC going low, and thermal
shutdown. During shutdown, the signaling path
is first blocked to avoid any fault triggering.
VCOMP and the internal supply rail are then
pulled down. The floating driver is not subject to
this shutdown command.
Floating Driver and Bootstrap Charging
An internal bootstrap capacitor powers the
floating power MOSFET driver. A dedicated
internal regulator charges and regulates the
bootstrap capacitor voltage to about 5V (see
Figure 3). When the voltage between the BST
and SW nodes drops below the regulation
voltage, a PMOS pass transistor that is
connected from VIN to BST turns on. The
charging current path is from VIN to BST to SW.
The external circuit should provide enough
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
APPLICATION INFORMATION
Setting the Output Voltage
The external resistor divider sets the output
voltage (see the Typical Application Circuits
section on page 21). The feedback resistor (R1)
sets the feedback loop bandwidth with the
internal compensation capacitor. Choose R1 to
be about 75kΩ when VOUT exceeds 1V. R2 can
then be calculated with Equation (1):
R2
R1
Figure 4 shows the feedback network.
C3
VOUT
R2
IC1 ILOAD x
R1
Figure 4: Feedback Network
Table 1 lists recommended resistor values for
common output voltages.
Table 1: Resistor Selection for Common Output
Voltages
VOUT (V)
R1 (kΩ)
R2 (kΩ)
1.8
2.5
3.3
5
75
75
75
75
61
35.7
24.3
14.3
Selecting the Input Capacitor
The step-down converter has a discontinuous
input current, and requires a capacitor to supply
AC current to the converter while maintaining
the DC input voltage. For the best performance,
use low-ESR capacitors. Ceramic capacitors
with X5R or X7R dielectrics are highly
recommended because of their low ESR and
small temperature coefficients. For the most
applications, use a 4.7µF capacitor.
Since C1 absorbs the input switching current, it
requires an adequate ripple current rating.
VOUT
VIN
V
x1 OUT
VIN
(2)
The worst-case condition occurs at VIN = 2VOUT,
calculated with Equation (3):
IC1
(1)
VOUT
1
0.807V
FB
The RMS current in the input capacitor can be
estimated with Equation (2):
ILOAD
2
(3)
For simplification, choose an input capacitor
with an RMS current rating greater than half of
the maximum load current.
The input capacitor can be electrolytic, tantalum,
or ceramic. When using electrolytic or tantalum
capacitors, add a small, high-quality ceramic
capacitor (e.g. 0.1μF) as close to the IC as
possible. When using ceramic capacitors,
ensure that they have enough capacitance to
provide a sufficient charge to prevent excessive
voltage ripple at the input. The input voltage
ripple caused by the capacitance can be
estimated with Equation (4):
ΔVIN
V
ILOAD
V
x OUT x 1 OUT
fSW xC1 VIN
VIN
(4)
Selecting the Output Capacitor
The output capacitor (C2) maintains the DC
output voltage. Use ceramic, tantalum, or lowESR electrolytic capacitors. For best results,
use low-ESR capacitors to keep the output
voltage ripple low. The output voltage ripple can
be estimated with Equation (5):
ΔVOUT
(5)
VOUT VOUT
1
x 1
x RESR
fSW xL1
VIN
8xfSW xC2
Where L1 is the inductor value, and RESR is the
equivalent series resistance (ESR) value of the
output capacitor.
For ceramic capacitors, the capacitance
dominates the impedance at the switching
frequency, and the capacitance causes the
majority of the output voltage ripple.
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
For simplification, the output voltage ripple can
be estimated with Equation (6):
ΔVOUT
V
VOUT
x 1 OUT
2
8xfSW xL1xC2
VIN
In these cases, add an external BST diode from
VCC to BST (see Figure 5).
(6)
BST
External BST Diode
IN4148
VOUT/VCC
MPM3509B
For tantalum or electrolytic capacitors, the ESR
dominates the impedance at the switching
frequency. For simplification, the output ripple
can be estimated with Equation (7):
ΔVOUT =
VOUT VOUT
x 1 xRESR
fSW xL1
VIN
(7)
The characteristics of the output capacitor also
affect the stability of the regulation system. The
MPM3509B can be optimized for a wide range
of capacitance and ESR values.
External Bootstrap Diode
An external bootstrap diode can enhance the
efficiency of the regulator under the following
conditions:
VOUT is 5V or 3.3V
The duty cycle (D) exceeds 65%. D can be
estimated with Equation (9):
D=
VOUT
VIN
(9)
OUT
COUT
Figure 5: Optional External Bootstrap Diode
Added to Enhance Efficiency
The recommended external BST diode is
IN4148.
Design Example
Table 2 lists a design example following the
application guidelines for the specifications
below.
Table 2: Design Example
VIN
VOUT
IOUT
12V
3.3V
0.6A
See the Typical Performance Characteristics
section on page 8 for more details. For
additional device applications, refer to the
related evaluation board datasheet.
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
PCB Layout Guidelines (8)
Efficient PCB layout, especially input capacitor
placement, is critical for stable operation. For
the best results, refer to Figure 6 and follow the
guidelines below:
1.
Connect a large ground plane directly to
PGND. If the bottom layer is a ground
plane, add vias near PGND.
2.
Ensure that the high-current paths at GND
and IN have short, direct, and wide traces.
3.
Place the ceramic input capacitor close to
IN and PGND.
4.
Keep the connection between the input
capacitor and IN as short and wide as
possible.
5.
Place the external feedback resistors next
to FB.
6.
Keep the feedback network away from the
switching node.
Inner Layer 2
Note:
8) The recommended layout is based on Figure 6.
Bottom Layer
Figure 6: Recommended PCB Layout
Top Layer
Inner Layer 1
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
TYPICAL APPLICATION CIRCUITS
BST
13
6, 7, 8, 12
SW
Continuous: 6V to
36V
VIN
16
IN
C2
0.1µF
C1
4.7µF
R3
100kΩ
2
EN/
SYNC
OUT
4
9, 10, 11
MPM3509B
R1
75Ω
EN/SYNC
FB
VCC
5V/0.6A
VOUT
C3
47µF
3
R2
14.3kΩ
R4
100kΩ
1
PG
PG
AGND
5
PGND
14, 15
Figure 7: VOUT = 5V, IOUT = 0.6A
BST
13
6, 7, 8, 12
SW
Continuous: 4V to 36V
16
IN
VIN
C2
0.1µF
C1
4.7µF
R3
100kΩ
2
EN/
SYNC
4
R4
100kΩ
PG
1
OUT
9, 10, 11
MPM3509B
R1
75kΩ
EN/SYNC
FB
VCC
3.3V/0.6A
VOUT
C3
47µF
3
R2
24.3kΩ
PG
AGND
5
PGND
14, 15
Figure 8: VOUT = 3.3V, IOUT = 0.6A
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
TYPICAL APPLICATION CIRCUITS (continued)
BST
13
6, 7, 8, 12
SW
Continuous: 4V to 36V
VIN
C1
4.7µF
C2
0.1µF
16
IN
R3
100kΩ
2
EN/
SYNC
4
R4
100kΩ
1
PG
OUT
9, 10, 11
MPM3509B
C3
47µF
R1
75kΩ
EN/SYNC
FB
VCC
2.5V/0.6A
VOUT
3
R2
35.7kΩ
PG
AGND
5
PGND
14, 15
Figure 9: VOUT = 2.5V, IOUT = 0.6A
BST
13
6, 7, 8, 12
SW
Continuous: 4V to 36V
VIN
C2
0.1µF
C1
4.7µF
16
IN
R3
100kΩ
2
EN/
SYNC
4
R4
100kΩ
PG
1
OUT
9, 10, 11
MPM3509B
R1
75kΩ
EN/SYNC
FB
VCC
1.8V/0.6A
VOUT
C4
22pF
C3
47µF
3
R2
61kΩ
PG
AGND
5
PGND
14, 15
Figure 10: VOUT = 1.8V, IOUT = 0.6A
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
TYPICAL APPLICATION CIRCUITS (continued)
4V to 36V
VIN
FB1
BLM41PG181SN1L
L1
2.2µH
U1
16
VEMI
CIN1
1nF
GND
CIN2
10nF
CIN3
1µF
CIN4
10µF
CIN5
22µF
C1A
C1B
10µF
10µF
IN
BST
13
C1C
0.1µF
MPM3509B
R1
100kΩ/
0402
2
EN
4
EN/SYNC
6, 7,
8, 12
SW
VOUT
VCC
R5
100kΩ/0402
VOUT
R3
82kΩ/0402
1
FB
PG
C2
C3
47µF
1nF
3
R4
26.1kΩ/0402
5, 14,
15
GND
PG
3.3V/0.6A
9, 10, 11
Figure 11: VOUT = 3.3V, IOUT = 0.6A with EMI Filter
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
PACKAGE INFORMATION
QFN-17 (3mmx5mmx1.6mm)
Wettable Flank
PIN 1 ID
0.125X45ºTYP
PIN 1 ID
MARKING
NOTE 2
PIN 1 ID
INDEX AREA
TOP VIEW
BOTTOM VIEW
SIDE VIEW
SECTION A-A
0.125X45º
NOTE:
NOTE 2
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) THE SHADED AREA IS THE KEEP-OUT ZONE. DO
NOT ELECTRONICALLY OR MECHNICALLY
CONNECT A PCB METAL TRACE OR VIA TO THIS
AREA.
3) THE LEAD SIDE IS WETTABLE.
4) LEAD COPLANARITY SHALL BE 0.10
MILLIMETERS MAX.
5) JEDEC REFERENCE IS MO-220.
6) DRAWING IS NOT TO SCALE.
RECOMMENDED LAND PATTERN
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MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
CARRIER INFORMATION
Part Number
Package Description
Quantity/Reel
Reel
Diameter
Carrier Tape
Width
Carrier Tape
Pitch
MPM3509BGQVEAEC1–Z
QFN-17
(3mmx5mmx1.6mm)
2500
13in
12mm
8mm
MPM3509B Rev. 1.0
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25
MPM3509B – SYNCHRONOUS STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
Revision History
Revision #
1.0
Revision
Date
5/28/2020
Description
Initial Release
Pages
Updated
-
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.
MPM3509B Rev. 1.0
www.MonolithicPower.com
6/2/2020
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2020 MPS. All Rights Reserved.
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