MPQ4314
45V, 4A, Low-IQ, Synchronous Step-Down
Converter with Frequency Spread Spectrum,
AEC-Q100 Qualified
DESCRIPTION
FEATURES
The MPQ4314 is a configurable-frequency,
synchronous, step-down switching regulator with
integrated internal high-side and low-side power
MOSFETs (HS-FET and LS-FET, respectively).
It provides up to 4A highly efficient output current
(IOUT) with current mode control for fast loop
response.
•
The wide 3.3V to 45V input voltage (VIN) range
accommodates a variety of step-down
applications in automotive input environments. A
1.7μA shutdown mode quiescent current allows
the device to be used in battery-powered
applications.
High power conversion efficiency across a wide
load range is achieved by scaling down the
switching frequency (fSW) under light-load
conditions to reduce the switching and gate
driver losses.
An open-drain power good (PG) signal indicates
whether the output is within 95% to 105% of its
nominal voltage.
Frequency foldback helps prevent inductor
current runaway during start-up. Thermal
shutdown provides reliable, fault-tolerant
operation. High-duty cycle and low-dropout
mode are provided for automotive cold crank
conditions.
The MPQ4314 is available in a QFN-20
(4mmx4mm) package.
MPQ4314 FAMILY VERSIONS
Part Number
MPQ4312
MPQ4313
MPQ4314
MPQ4315
MPQ4316
MPQ4317
IOUT
2A
3A
4A
5A
6A
7A
Note:
1)
Package
QFN-20
(4mmx4mm) WF (1)
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Wide 3.3V to 45V Operating Input Voltage
(VIN) Range
4A Continuous Output Current (IOUT)
1.7μA Low Shutdown Supply Current (ISHDN)
18μA Sleep Mode Quiescent Current (IQ)
Internal 48mΩ High-Side MOSFET (HSFET) and 20mΩ Low-Side MOSFET (LSFET)
350kHz to 1000kHz Programmable
Switching Frequency (fSW) for Car Battery
Applications
Synchronize to External Clock
Out-of-Phase Synchronized Clock Output
Fixed Output Options: 3.3V
Frequency Spread Spectrum (FSS) for Low
EMI
Symmetric VIN for Low EMI
Power Good (PG) Output
External Soft Start (SS)
100ns Minimum On Time
Selectable Advanced Asynchronous
Modulation (AAM) Mode or Forced
Continuous Conduction Mode (FCCM)
Low-Dropout Mode
Hiccup Over-Current Protection (OCP)
Available in a QFN-20 (4mmx4mm)
Package
Available in a Wettable Flank Package
Available in AEC-Q100 Grade 1
APPLICATIONS
•
•
•
•
Automotive Infotainment
Automotive Clusters
Advanced Driver Assistance Systems
(ADAS)
Industrial 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 “Simple, Easy Solutions” are
trademarks of Monolithic Power Systems, Inc. or its subsidiaries.
WF means wettable flank.
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
1
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL APPLICATION
Efficiency vs. Load Current
VIN =
3.3V to 45V
BST
VOUT
VOUT = 5V, fSW = 470kHz, L = 4.7μH
(DCR = 15mΩ), AAM mode
EN
VIN
MODE
100
SYNCO
90
SW
FREQ
FB
VCC
PG
NC
SS
SYNCIN
GND
Figure 1: Adjustable-Output Version
VIN =
3.3V to 45V
80
70
60
50
40
30
20
10
0
Vin=12V
Vin=24V
Vin=36V
Vin=45V
0.1
EN
VIN
BST
VOUT
EFFICIENCY (%)
MPQ4314
1
10
100
LOAD CURRENT (mA)
1000 4000
MODE
SYNCO
SW
MPQ4314
FREQ
FB
PG
VCC
SS
NC
SYNCIN
GND
Figure 2: Output Fixed Version
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
2
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
ORDERING INFORMATION
Part Number*
Package
Top Marking
MSL Rating**
MPQ4314GRE-AEC1***
MPQ4314GRE-33-AEC1***
QFN-20 (4mmx4mm)
QFN-20 (4mmx4mm)
See Below
See Below
1
1
* For Tape & Reel, add suffix -Z (e.g. MPQ4314GRE-AEC1-Z).
** Moisture Sensitivity Level Rating
*** Wettable Flank
TOP MARKING
MPS: MPS prefix
Y: Year code
WW: Week code
MP4314: Part number
LLLLLL: Lot number
E: Wettable flank
PACKAGE REFERENCE
TOP VIEW
20
SS
FB
19
18
NC
17
16
15
MODE
SYNCIN
14
2
13
VIN
3
12
VIN
PGND
4
11
PGND
PGND
5
10
6
7
8
9
BST
SW
SW
EN
QFN-20 (4mmx4mm)
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
3
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
PIN FUNCTIONS
Pin #
Name
Description
1
MODE
AAM or FCCM select pin. Pull this pin high to make the MPQ4314 operate in forced
continuous conduction mode (FCCM). Pull it low to make the MPQ4314 operate in
advanced asynchronous modulation (AAM) mode under light loads. Do not float this pin.
2
SYNC input. Apply a 350kHz to 1000kHz clock signal to the SYNCIN pin to synchronize
the internal oscillator frequency to the external clock. This pin has an internal high
impedance. Do not float this pin. If using the SYNCIN pin, ensure that the external SYNC
SYNCIN
clock has adequate pull-up and pull-down capability. It is recommended to place a ≤51kΩ
resistor between the SYNCIN pin and GND if the external SYNC clock’s pull-down
capability is not sufficient, or if the pin enters a high-impedance (Hi-Z) state.
Input supply. VIN supplies power to all of the internal control circuitry, as well as the power
MOSFET connected to SW. To minimize switching spikes, it is recommended to connect
a decoupling capacitor from VIN to ground, as close to VIN as possible.
3, 12
VIN
4, 5, 10, 11
PGND
6
BST
Bootstrap. BST is the positive power supply for the high-side MOSFET (HS-FET) driver
connected to SW. Connect a bypass capacitor between this pin and SW. See the
Application Information section on page 33 to calculate the size of this capacitor.
7, 8
SW
Switch node. SW is the output of the internal power MOSFET.
9
EN
Enable. Pull the EN pin below the specified threshold (0.85V) to shut down the chip. Pull
the EN pin above the specified threshold (1V) to enable the chip.
Power ground.
13
SYNC output. This pin can output a clock signal 180° out-of-phase with the internal
SYNCO oscillator signal, or opposite of the clock signal applied at the SYNCIN pin. Float this pin if
it is not used.
14
PG
Power good (PG) indicator. This pin has an open-drain output. A pull-up resistor
connected to the power source is required if this pin is used. PG goes high if the output
voltage (VOUT) is within 95% to 105% of the nominal voltage. PG goes low if VOUT is above
106.5% or below 93.5% of the nominal voltage.
15
NC
Not connected. Float this pin.
16
VCC
17
AGND
18
FB
Feedback input. To set VOUT, connect FB to the center point of the external resistor divider
between the output and AGND. The feedback threshold voltage (VFB) is 0.815V. Place the
resistor divider as close to FB as possible. Avoid placing vias on the FB traces.
19
SS
Soft start (SS) input. Place a capacitor from SS to GND to set the soft-start time (tSS).
The MPQ4314 sources 13μA from SS to the soft-start capacitor (CSS) at start-up. As the
SS voltage (VSS) rises, VFB increases to limit the inrush current during start-up.
20
FREQ
Switching frequency configuration. Connect a resistor from this pin to ground to set the
switching frequency. To set the frequency, see the fSW vs. RFREQ curve on page 15.
Bias supply. This pin supplies power to the internal control circuit and gate drivers. A
decoupling capacitor to ground must be placed close to this pin. See the Application
Information section on page 33 to calculate the size of this capacitor.
Analog ground.
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
4
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
θJA
θJC
ABSOLUTE MAXIMUM RATINGS (2)
Thermal Resistance
VIN, EN ......................................... -0.3V to +50V
SW ................................. -0.3V to VIN(MAX) +0.3V
BST ..................................................VSW + 5.5V
All other pins ............................... -0.3V to +5.5V
Continuous power dissipation ... (TA = 25°C) (3) (5)
QFN-20 (4mmx4mm) .................................5.4W
Operating junction temperature................ 150°C
Lead temperature .................................... 260°C
Storage temperature ................ -65°C to +150°C
QFN-20 (4mmx4mm)
JESD51-7 (4)............................44.........9....°C/W
EVQ4314-R-00A (5)..................23........2.5..°C/W
ESD Ratings
Human body model (HBM) ........................ ±2kV
Charged device model (CDM).................. ±750V
Recommended Operating Conditions
Supply voltage (VIN) ........................ 3.3V to 45V
Output voltage (VOUT) ............ 0.815 to 0.95 x VIN
Operating junction temp (TJ) .... -40°C to +150°C
Notes:
2) Exceeding these ratings may damage the device.
3) 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 can cause excessive die temperature, and the
regulator may go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
4) Measured on JESD51-7, 4-layer PCB. The values given in this
table are only valid for comparison with other packages and
cannot be used for design purposes. These values were
calculated in accordance with JESD51-7, and simulated on a
specified JEDEC board. They do not represent the
performance obtained in an actual application.
5) Measured on an MPS standard EVB, 4-layer (9cmx9cm) PCB.
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
5
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
ELECTRICAL CHARACTERISTICS
VIN = 12V, VEN = 2V, TJ = -40°C to +125°C, typical values are at TJ = 25°C, unless otherwise noted.
Parameter
VIN under-voltage lockout
(UVLO) rising threshold
VIN UVLO falling threshold
Symbol
VIN_UVLO_RISING
VIN_UVLO_
FALLING
VIN UVLO hysteresis
VCC voltage
VCC regulation
VCC current limit
VIN_UVLO_HYS
VCC
VIN quiescent current
IQ
VIN quiescent current (switching)
(6)
VIN shutdown current
ILIMIT_VCC
IQ_ACTIVE
ISHDN
FB reference voltage
VFB
Output voltage accuracy
(MPQ4314-33)
VOUT
FB current
IFB
Switching frequency
fSW
Minimum on time (6)
Minimum off time (6)
SYNCIN voltage rising threshold
SYNCIN voltage falling threshold
Condition
IVCC = 0A
IVCC = 30mA
VCC = 4V
FB = 0.85V, no load, (sleep
mode)
MODE = GND (AAM mode),
switching, no load,
RFB_UP = 1MΩ,
RFB_DOWN = 316kΩ
MODE = high (FCCM),
switching, fSW = 2MHz, no
load
MODE = high (FCCM),
switching, fSW = 470kHz, no
load
Min
Typ
Max
Units
2.8
3
3.2
V
2.5
2.7
2.9
V
4.6
280
4.9
1
5.2
4
mV
V
%
mA
18
26
μA
100
VFB = 0.85V, adjustableoutput version
RFREQ = 62kΩ
RFREQ = 26.1kΩ
mA
μA
V
0.799 0.815
3234 3300
0.831
3366
V
mV
3201
3300
3399
mV
-50
0
+50
nA
420
820
470
1000
100
80
520
1180
0.4
kHz
kHz
ns
ns
V
V
1000
kHz
1.8
External clock
350
SYNCO high voltage
VSYNCO_HIGH
ISYNCO = -1mA
3.3
SYNCO low voltage
SYNCO phase shift
VSYNCO_LOW
ISYNCO = 1mA
Tested under SYNCIN
ILIMIT_VALLEY
9.5
3.5
fSYNC
ILIMIT
mA
0.823
SYNCIN clock range
HS current limit
LS valley current limit
40
1.7
tON_MIN
tOFF_MIN
VSYNC_RISING
VSYNC_FALLING
μA
0.807 0.815
EN = 0V
VIN = 3.3V to 45V, TJ = 25C
VIN = 3.3V to 45V
TJ = 25°C
20
Duty cycle = 30%
4.5
V
0.4
V
deg
9.6
7.2
A
A
180
6.4
4.8
8
6
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
6
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, VEN = 2V, TJ = -40°C to +125°C, typical values are at TJ = 25°C, unless otherwise noted.
Parameter
Zero-current detection (ZCD)
current
Low-side (LS) reverse current
limit
Switch leakage current
High-side MOSFET (HS-FET)
on resistance
Low-side MOSFET (LS-FET) on
resistance
Soft-start current
Symbol
Condition
Min
Typ
Max
Units
IZCD
AAM mode
-0.15
0.1
0.35
A
2
4.5
7
A
0.01
1
µA
ILIMIT_REVERSE
FCCM
ISW_LKG
RON_HS
VBST - VSW = 5V
48
80
mΩ
RON_LS
VCC = 5V
20
40
mΩ
ISS
VSS = 0V
8
13
19
µA
EN rising threshold
VEN_RISING
0.8
1
1.2
V
EN falling threshold
VEN_FALLING
0.65
0.85
1.05
V
EN hysteresis voltage
VEN_HYS
MODE rising threshold
VMODE_RISING
MODE falling threshold
VMODE_FALLING
PG rising threshold (VFB / VREF)
PG falling threshold (VFB / VREF)
PG output voltage low
PG rising delay
PG falling delay
(6)
Thermal shutdown
Thermal shutdown hysteresis (6)
190
mV
1.8
V
0.4
PGRISING
VFB rising
VFB falling
92%
102%
95%
105%
98%
108%
PGFALLING
VFB falling
VFB rising
90.5%
103.5%
93.5%
106.5%
96.5%
109.5%
0.1
0.3
VPG_LOW
ISINK = 1mA
V
VREF
V
tPG_R_DELAY
35
µs
tPG_F_DELAY
35
µs
TSD
TSD_HYS
170
20
°C
°C
Note:
6) Derived from bench testing characterization. Not tested in production.
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
7
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL CHARACTERISTICS
VIN = 12V, TJ = -40°C to +125°C, unless otherwise noted.
Quiescent Current vs. Temperature
23
Feedback Voltage vs. Temperature
0.818
22
0.817
0.816
20
VFB (V)
IQ (μA)
21
19
0.815
18
0.814
17
0.813
16
15
0.812
-50
-25
0
25
50
75
100
125
-50
-25
TEMPERATURE (°C)
125
6.4
9.0
8.8
8.6
8.4
8.2
8.0
7.8
7.6
7.4
7.2
7.0
6.3
6.2
6.1
6.0
5.9
5.8
5.7
5.6
-50
-25
0
25
50
75
100
-50
125
-25
0
25
50
75
100
125
TEMPERATURE (°C)
TEMPERATURE (°C)
Reverse Current Limit vs.
Temperature
VIN UVLO Threshold vs. Temperature
3.1
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
4.1
4.0
VIN UVLO THRESHOLD (V)
ILIMIT_REVERSE (A)
100
Valley Current Limit vs. Temperature
ILIMIT_VALLEY (A)
ILIMIT (A)
Current Limit vs. Temperature
0
25
50
75
TEMPERATURE (°C)
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
3.0
2.9
VIN UVLO Rising
2.8
VIN UVLO Falling
2.7
2.6
-50
-25
0
25
50
75
TEMPERATURE (°C)
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
100
125
8
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL CHARACTERISTICS (continued)
VIN = 12V, TJ = -40°C to +125°C, unless otherwise noted.
PG Rising and Falling Thresholds vs.
Temperature
EN UVLO Threshold vs. Temperature
PG THRESHOLDS (% OF VREF)
1.05
EN UVLO (V)
1.00
0.95
EN UVLO Rising
EN UVLO Falling
0.90
0.85
0.80
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
110
108
106
104
102
100
98
96
94
92
90
88
125
-50
VIN Shutdown Current vs.
Temperature
-25
0
25
50
75
TEMPERATURE (°C)
100
125
100
125
100
125
HS-FET On Resistance vs.
Temperature
2.2
70
2.1
65
2.0
60
RHS_ON (mΩ)
ISHDN (μA)
PG Upper Falling Threshold
PG Lower Rising Threshold
PG Upper Rising Threshold
PG Lower Falling Threshold
1.9
1.8
1.7
55
50
45
1.6
40
1.5
35
1.4
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
-50
125
LS-FET On Resistance vs.
Temperature
-25
0
25
50
75
TEMPERATURE (°C)
VCC vs. Temperature
30
4.96
28
4.95
4.93
VCC (V)
RLS_ON (mΩ)
4.94
26
24
22
4.92
4.91
4.90
20
4.89
18
4.88
16
4.87
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
-50
-25
0
25
50
75
TEMPERATURE (°C)
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
9
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL CHARACTERISTICS (continued)
VIN = 12V, TJ = -40°C to +125°C, unless otherwise noted.
Zero-Current Detection vs.
Temperature
Soft-Start Current vs. Temperature
150
15.0
14.5
130
13.5
ZCD (mA)
ISS (μA)
14.0
13.0
12.5
110
90
12.0
70
11.5
11.0
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
100
125
50
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
Switching Frequency vs.
Temperature
RFREQ = 62kΩ
473
472
fSW (kHz)
471
470
469
468
467
466
465
-50
-25
0
25
50
75
TEMPERATURE (°C)
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
10
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VOUT = 3.3V, L = 4.7μH (7), fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
Input Current vs. Load Current
Input Current vs. Load Current
AAM mode, VOUT = 3.3V
AAM mode, VOUT = 5V
80
60
INPUT CURRENT (µA)
70
INPUT CURRENT (µA)
120
VIN=12V
VIN=24V
VIN=36V
VIN=45V
50
40
30
VIN=12V
VIN=24V
VIN=36V
VIN=45V
100
80
60
40
20
20
10
20
30
40 50 60 70 80
LOAD CURRENT (µA)
10
90 100
Efficiency vs. Load Current
20
30
40 50 60 70 80
LOAD CURRENT (µA)
90 100
Efficiency vs. Load Current
AAM mode, VOUT = 3.3V
AAM mode, VOUT = 3.3V
100
90
80
90
EFFICIENCY (%)
EFFICIENCY (%)
70
60
50
40
Vin=12V
Vin=24V
Vin=36V
Vin=45V
30
20
80
70
60
Vin=12V
Vin=24V
Vin=36V
Vin=45V
50
10
40
0.1
0.5
1
10
5
10
Efficiency vs. Load Current
20
98
18
96
16
94
14
92
90
88
Vin=12V
Vin=24V
Vin=36V
Vin=45V
EFFICIENCY (%)
EFFICIENCY (%)
1000
5
10
FCCM, VOUT = 3.3V
100
82
500
Efficiency vs. Load Current
AAM mode, VOUT = 3.3V
84
100
LOAD CURRENT (mA)
LOAD CURRENT (mA)
86
50
Vin=12V
Vin=24V
Vin=36V
Vin=45V
12
10
8
6
4
2
0
80
1000
2000
3000
LOAD CURRENT (mA)
4000
0.1
0.5
1
LOAD CURRENT (mA)
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
11
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Efficiency vs. Load Current
Efficiency vs. Load Current
FCCM, VOUT = 3.3V
FCCM, VOUT = 3.3V
100
100
90
98
80
96
70
EFFICIENCY (%)
EFFICIENCY (%)
VIN = 12V, VOUT = 3.3V, L = 4.7μH (7), fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
60
50
40
30
Vin=12V
Vin=24V
Vin=36V
Vin=45V
20
10
500
100
50
LOAD CURRENT (mA)
88
Vin=12V
Vin=24V
Vin=36V
Vin=45V
86
80
1000
1000
2000
3000
LOAD CURRENT (mA)
Efficiency vs. Load Current
Efficiency vs. Load Current
AAM mode, VOUT = 5V
AAM mode, VOUT = 5V
4000
100
80
90
70
EFFICIENCY (%)
EFFICIENCY (%)
90
82
90
60
50
Vin=12V
Vin=24V
Vin=36V
Vin=45V
40
30
20
80
70
60
Vin=12V
Vin=24V
Vin=36V
Vin=45V
50
40
10
0.1
5
0.5
1
LOAD CURRENT (mA)
10
10
50
100
LOAD CURRENT (mA)
Efficiency vs. Load Current
Efficiency vs. Load Current
AAM mode, VOUT = 5V
FCCM, VOUT = 5V
100
98
94
92
90
88
Vin=12V
Vin=24V
Vin=36V
Vin=45V
86
84
82
80
1000
2000
3000
LOAD CURRENT (mA)
4000
EFFICIENCY (%)
96
EFFICIENCY (%)
92
84
0
10
94
24
22
20
18
16
14
12
10
8
6
4
2
0
500
1000
5
10
Vin=12V
Vin=24V
Vin=36V
Vin=45V
0.1
0.5
1
LOAD CURRENT (mA)
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
12
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Efficiency vs. Load Current
Efficiency vs. Load Current
FCCM, VOUT = 5V
FCCM, VOUT = 5V
100
100
90
98
80
96
70
EFFICIENCY (%)
EFFICIENCY (%)
VIN = 12V, VOUT = 3.3V, L = 4.7μH (7), fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
60
50
40
30
Vin=12V
Vin=24V
Vin=36V
Vin=45V
20
10
500
100
50
LOAD CURRENT (mA)
92
90
88
Vin=12V
Vin=24V
Vin=36V
Vin=45V
86
84
82
0
10
94
80
1000
1000
Load Regulation
0.12
0.09
0.09
LOAD REGULATION (%)
LOAD REGULATION (%)
FCCM, VOUT = 3.3V
0.12
VIN=12V
VIN=24V
VIN=36V
VIN=45V
0.03
0.00
-0.03
-0.06
10
100
1000
LOAD CURRENT (mA)
VIN=12V
VIN=24V
VIN=36V
VIN=45V
0.06
0.03
0.00
-0.03
-0.06
4000
10
Line Regulation
100
1000
LOAD CURRENT (mA)
4000
Line Regulation
AAM mode, VOUT = 3.3V
FCCM, VOUT = 3.3V
0.10
0.10
0.08
0.08
Io=10mA
Io=2A
Io=4A
0.06
0.04
LINE REGULATION (%)
LINE REGULATION (%)
4000
Load Regulation
AAM mode, VOUT = 3.3V
0.06
2000
3000
LOAD CURRENT (mA)
0.02
0.00
-0.02
-0.04
-0.06
0.06
0.04
0.02
0.00
Io=10mA
Io=2A
Io=4A
-0.02
-0.04
-0.08
5
10
15 20 25 30 35
INPUT VOLTAGE (V)
40
45
5
10
15 20 25 30 35
INPUT VOLTAGE (V)
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
40
45
13
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH (7), fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
Load Regulation
Load Regulation
AAM mode, VOUT = 5V
FCCM, VOUT = 5V
0.12
0.09
LOAD REGULATION (%)
LOAD REGULATION (%)
0.12
VIN=12V
VIN=24V
VIN=36V
VIN=45V
0.06
0.03
0.00
-0.03
-0.06
-0.09
0.09
0.03
0.00
-0.03
-0.06
10
100
1000
LOAD CURRENT (mA)
10
4000
Line Regulation
4000
FCCM, VOUT = 5V
0.10
0.08
0.06
LINE REGULATION (%)
Io=10mA
Io=2A
Io=4A
0.08
LINE REGULATION (%)
100
1000
LOAD CURRENT (mA)
Line Regulation
AAM mode, VOUT = 5V
0.04
0.02
0.00
-0.02
-0.04
0.06
0.04
0.02
0.00
Io=10mA
Io=2A
Io=4A
-0.02
-0.04
-0.06
5
10
15 20 25 30 35
INPUT VOLTAGE (V)
40
5
45
Case Temperature Rise
10
15 20 25 30 35
INPUT VOLTAGE (V)
40
45
Case Temperature Rise
VOUT = 3.3V
VOUT = 5V
30
CASE TEMPERATURE RISE
( C)
30
CASE TEMPERATURE RISE
(°C)
VIN=12V
VIN=24V
VIN=36V
VIN=45V
0.06
25
20
15
10
5
0
0
1
2
3
LOAD CURRENT (A)
4
25
20
15
10
5
0
0
1
2
3
4
LOAD CURRENT (A)
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
14
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH (7), fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
fSW vs. RFREQ
fSW vs. RFREQ
RFREQ = 10kΩ to 30kΩ
RFREQ = 10kΩ to 30kΩ
2400
900
2250
800
2100
700
1800
fSW (kHz)
fSW (kHz)
1950
1650
1500
600
500
1350
1200
400
1050
900
300
10 12 14 16 18 20 22 24 26 28 30
RFREQ (kΩ)
30
60
70
RFREQ (kΩ)
80
90
100
VOUT = 5V
5.2
Rfreq=62K
Rfreq=12K
4.9
4.6
VOUT (V)
fSW (kHz)
50
Low-Dropout Mode
fSW vs. VIN
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
0
40
4.3
4.0
3.7
IOUT=0A
IOUT=1A
IOUT=2A
IOUT=3A
IOUT=4A
3.4
3.1
2.8
2.5
6
9 12 15 18 21 24 27 30 33 36 39 42 45
VIN (V)
3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7 6.0
VIN (V)
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
15
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 5V, IOUT = 4A, L = 4.7μH (7), fSW = 470kHz, TA = 25°C, unless otherwise noted.(8)
CISPR25 Class 5 Peak Conducted
Emissions
CISPR25 Class 5 Average Conducted
Emissions
150kHz to 108MHz
AVG CONDUCTED EMI (dBuV)
PK CONDUCTED EMI (dBuV)
150kHz to 108MHz
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
-5
-10
-15
-20
CISPR25 CLASS 5 PK LIMITS
PK NOISE FLOOR
1
0.1
Frequency (MHz)
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
-5
-10
-15
-20
CISPR25 CLASS 5 AVG LIMITS
108
10
0.1
CISPR25 Class 5 Peak Radiated
Emissions
PK RADIATED EMI (dBuV)
AVG RADIATED EMI (dBuV)
PK NOISE FLOOR
1
Frequency (MHz)
30
10
60
55
50
45
40
35
30
25
20
15
10
5
0
-5
-10
AVG RADIATED EMI (dBuV)
PK RADIATED EMI (dBuV)
CISPR25 CLASS 5 PK LIMITS
PK NOISE FLOOR
230
330
1
Frequency (MHz)
30
10
30MHz to 1GHz
HORIZONTAL POLARIZATION
130
AVG NOISE FLOOR
CISPR25 Class 5 Average Radiated
Horizontal
30MHz to 1GHz
30
108
10
CISPR25 CLASS 5 AVG LIMITS
0.1
CISPR25 Class 5 Peak Radiated
Horizontal
55
50
45
40
35
30
25
20
15
10
5
0
-5
Frequency (MHz)
150kHz to 30MHz
CISPR25 CLASS 5 PK LIMITS
0.1
1
CISPR25 Class 5 Average Radiated
Emissions
150kHz to 30MHz
60
55
50
45
40
35
30
25
20
15
10
5
0
-5
-10
AVG NOISE FLOOR
430
530
630
Frequency (MHz)
730
830
930 1000
55
50
45
40
35
30
25
20
15
10
5
0
-5
HORIZONTAL POLARIZATION
CISPR25 CLASS 5 AVG LIMITS
AVG NOISE FLOOR
30
130
230
330
430
530
630
Frequency (MHz)
730
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
830
930 1000
16
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 5V, IOUT = 4A, L = 4.7μH (7), fSW = 470kHz, TA = 25°C, unless otherwise noted.(8)
CISPR25 Class 5 Peak Radiated
Emissions
CISPR25 Class 5 Average Radiated
Emissions
Vertical, 30MHz to 1GHz
VERTICAL POLARIZATION
AVG RADIATED EMI (dBuV)
PK RADIATED EMI (dBuV)
Vertical, 30MHz to 1GHz
55
50
45
40
35
30
25
20
15
10
5
0
-5
CISPR25 CLASS 5 PK LIMITS
PK NOISE FLOOR
30
130
230
330
430
530
630
Frequency (MHz)
730
830
930 1000
55
50
45
40
35
30
25
20
15
10
5
0
-5
VERTICAL POLARIZATION
CISPR25 CLASS 5 AVG LIMITS
AVG NOISE FLOOR
30
130
230
330
430
530
630
Frequency (MHz)
730
830
930 1000
Notes:
7) Inductor part number: XAL6060-472MEC. DCR = 15mΩ.
8) The EMC test results are based on the application circuit with EMI filters (see Figure 14 on page 35).
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
17
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
Steady State
Steady State
IOUT = 0A, AAM mode
IOUT = 0A, FCCM
CH2:
VOUT/AC
50mV/div.
CH3: PG
5V/div.
CH1: VSW
5V/div.
CH2:
VOUT/AC
10mV/div.
CH4: IL
1A/div.
CH4: IL
500mA/div.
CH1: VSW
5V/div.
2μs/div.
40ms/div.
Steady State
Start-Up through VIN
IOUT = 4A
IOUT = 0A, AAM mode
CH3: PG
5V/div.
CH3: VIN
5V/div.
CH1: VSW
5V/div.
CH2:
VOUT/AC
10mV/div.
CH2: VOUT
1V/div.
CH4: IL
2A/div.
CH1: VSW
10V/div.
CH4: IL
1A/div.
2μs/div.
1ms/div.
Start-Up through VIN
Start-Up through VIN
IOUT = 0A, FCCM
IOUT = 4A
CH3: VIN
5V/div.
CH1: VSW
5V/div.
CH3: VIN
5V/div.
CH1: VSW
5V/div.
CH2: VOUT
2V/div.
R1: PG
5V/div.
CH4: IL
1A/div.
CH2: VOUT
2V/div.
R1: PG
5V/div.
CH4: IL
2A/div.
1ms/div.
1ms/div.
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
18
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
Shutdown through VIN
Shutdown through VIN
IOUT = 0A, AAM mode
IOUT = 0A, FCCM
CH3: VIN
5V/div.
CH3: VIN
5V/div.
CH1: VSW
5V/div.
CH4: IL
1A/div.
CH2: VOUT
1V/div.
CH2: VOUT
2V/div.
R1: PG
5V/div.
CH4: IL
500mA/div.
CH1: VSW
5V/div.
10ms/div.
10ms/div.
Shutdown through VIN
Start-Up through EN
IOUT = 4A
IOUT = 0A, AAM mode
CH3: VEN
2V/div.
CH3: VIN
5V/div.
CH1: VSW
5V/div.
CH2: VOUT
1V/div.
CH2: VOUT
2V/div.
R1: PG
5V/div.
CH4: IL
5A/div.
CH4: IL
2A/div.
CH1: VSW
10V/div.
4ms/div.
1ms/div.
Start-Up through EN
Start-Up through EN
IOUT = 0A, FCCM
IOUT = 4A
CH3: VEN
2V/div.
CH3: VEN
2V/div.
CH1: VSW
5V/div.
CH1: VSW
5V/div.
CH2: VOUT
2V/div.
R1: PG
5V/div.
CH4: IL
2A/div.
CH2: VOUT
2V/div.
R1: PG
5V/div.
CH4: IL
5A/div.
1ms/div.
1ms/div.
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
19
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
Shutdown through EN
Shutdown through EN
IOUT = 0A, AAM mode
IOUT = 0A, FCCM
CH3: VEN
2V/div.
CH3: VEN
2V/div.
CH1: VSW
5V/div.
CH4: IL
1A/div.
CH2: VOUT
1V/div.
CH2: VOUT
2V/div.
R1: PG
5V/div.
CH4: IL
1A/div.
CH1: VSW
5V/div.
100ms/div.
100ms/div.
Shutdown through EN
SCP Entry
IOUT = 4A
IOUT = 0A, AAM mode
CH3: VEN
2V/div.
CH2: VOUT
2V/div.
CH3: VPG
5V/div.
CH1: VSW
5V/div.
CH2: VOUT
2V/div.
R1: PG
5V/div.
CH4: IL
5A/div.
CH4: IL
10A/div.
CH1: VSW
10V/div.
100µs/div.
20ms/div.
SCP Entry
SCP Entry
IOUT = 0A, FCCM
IOUT = 4A
CH2: VOUT
2V/div.
CH2: VOUT
2V/div.
CH3: VPG
5V/div.
CH3: VPG
5V/div.
CH4: IL
10A/div.
CH4: IL
5A/div.
CH1: VSW
10V/div.
CH1: VSW
10V/div.
20ms/div.
20ms/div.
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
20
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
SCP Recovery
SCP Recovery
IOUT = 0A, AAM mode
IOUT = 0A, FCCM
CH2: VOUT
2V/div.
CH2: VOUT
2V/div.
CH3: VPG
5V/div.
CH3: VPG
5V/div.
CH4: IL
5A/div.
CH4: IL
10A/div.
CH1: VSW
10V/div.
CH1: VSW
10V/div.
10ms/div.
20ms/div.
SCP Recovery
SCP Steady State
IOUT = 4A
CH2: VOUT
1V/div.
CH2: VOUT
2V/div.
CH3: VPG
5V/div.
CH4: IL
5A/div.
CH4: IL
5A/div.
CH1: VSW
10V/div.
CH1: VSW
10V/div.
20ms/div.
10ms/div.
Load Transient
SYNC Operation
IOUT = 2A to 4A, 1.6A/μs
IOUT = 4A, SYNC frequency = 350kHz
CH3:
SYNCIN
5V/div.
CH2:
VOUT/AC
100mV/div.
CH2: VOUT
1V/div.
CH4: IL
2A/div.
CH1: VSW
10V/div.
CH4: IOUT
2A/div.
CH1: VSW
10V/div.
200µs/div.
2µs/div.
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
21
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
SYNC Operation
SYNCO Operation
IOUT = 4A, SYNC frequency = 1000kHz
IOUT = 4A, SYNC frequency = 350kHz
CH3:
SYNCIN
2V/div.
CH3:
SYNCO
2V/div.
CH4: IL
2A/div.
CH2: VOUT
1V/div.
CH1: VSW
5V/div.
CH4: IL
2A/div.
CH2: VOUT
1V/div.
CH1: VSW
5V/div.
1µs/div.
2µs/div.
SYNCO Operation
PG in Start-Up through VIN
IOUT = 4A, SYNC frequency = 1000kHz
IOUT = 0A, AAM mode
CH3:
SYNCO
2V/div.
CH3: VIN
5V/div.
CH2: VOUT
2V/div.
CH4: IL
2A/div.
CH2: VOUT
1V/div.
CH1: VSW
5V/div.
CH4: VPG
2V/div.
CH1: VSW
10V/div.
1µs/div.
1ms/div.
PG in Shutdown through VIN
PG in Start-Up through EN
IOUT = 0A, AAM mode
IOUT = 0A, AAM mode
CH3: VEN
2V/div.
CH3: VIN
5V/div.
CH2: VOUT
2V/div.
CH2: VOUT
2V/div.
CH4: VPG
2V/div.
CH4: VPG
2V/div.
CH1: VSW
5V/div.
CH1: VSW
5V/div.
20ms/div.
1ms/div.
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
22
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
PG in Shutdown through EN
Low-Dropout Mode
IOUT = 0A, AAM mode
VIN = 3.3V, VOUT set to 3.3V, IOUT = 0A
CH3: VEN
2V/div.
CH4: IL
50mA/div.
CH2: VOUT
2V/div.
CH3: VIN
500mV/div.
CH1: VSW
1V/div.
CH2: VOUT
500mV/div.
CH4: VPG
2V/div.
CH1: VSW
5V/div.
100ms/div.
4µs/div.
Low-Dropout Mode
Load Dump
VIN = 3.3V, VOUT set to 3.3V, IOUT = 4A
VIN = 12V to 36V, IOUT = 4A
CH3: VIN
1V/div.
CH2: VOUT
1V/div.
CH3: VIN
10V/div.
CH2: VOUT
2V/div.
CH4: IL
2A/div.
CH1: VSW
50V/div.
CH4: IL
1A/div.
CH1: VSW
1V/div.
4µs/div.
100ms/div.
Cold Crank
VIN Ramping Up and Down
VIN = 12V to 3.3V to 5V, IOUT = 4A
IOUT = 0.1A
CH3: VIN
5V/div.
CH3:VIN
1V/div.
CH2: VOUT
1V/div.
CH2: VOUT
1V/div.
CH4: IL
2A/div.
CH1: VSW
5V/div.
4ms/div.
1s/div.
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
23
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
CH3: VIN
10V/div.
VIN Ramping Down and Up
VIN Ramping Down and Up
IOUT = 1mA
IOUT = 4A
4.5V
4.5V
CH3: VIN
10V/div.
CH2: VOUT
2V/div.
CH4: IL
2A/div.
CH2: VOUT
2V/div.
CH4: IL
5A/div.
CH1: VSW
20V/div.
CH1: VSW
20V/div.
10s/div.
10s/div.
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
24
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
FUNCTIONAL BLOCK DIAGRAM
VCC
VCC
VCC
Regulator
VREF
EN
Reference
BST
Regulator
BST
FREQ
ISW
Oscillator
SYNCIN
PG
+
-
VPG_REF
VFB
Control Logic
SW
VCC
ISS
Error Amplifier
VREF
SS
VIN
VCC
VFB
+
+
-
VCOMP
1.15M
2pF
ILS
60pF
PGND
FB
AGND
MODE
Figure 3: Functional Block Diagram (Adjustable-Output Version)
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
25
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
FUNCTIONAL BLOCK DIAGRAM (continued)
VCC
VCC
VCC
Regulator
VREF
EN
VIN
VCC
Reference
BST
Regulator
BST
FREQ
ISW
Oscillator
SYNCIN
SYNCO
PG
+
-
VFB
Control Logic
Error Amplifier
VREF
VFB
+
+
-
VCOMP
1.15M
875k
FB
SW
VCC
ISS
SS
VPG_REF
2pF
ILS
60pF
PGND
280k
AGND
MODE
Figure 4: Functional Block Diagram (3.3V Fixed-Output Version)
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
26
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
TIMING SEQUENCE
VIN
0
SW
0
EN
0
EN
Threshold
15µs
VCC
Threshold
VCC
0
VOUT
95% of
VREF
93.5% of VREF
95% of
VREF
106.5% of VREF
105% of VREF
93.5% of VREF
70% of VREF
SS
0
IL = I LIMIT
IL
0
PG
35µs
35µs
35µs
35µs
35µs
35µs
0
Start-Up
Normal
Normal
OCP
OV
Normal
Shutdown
OC
Release
Figure 5: Timing Sequence
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
27
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
OPERATION
The MPQ4314 is a synchronous, step-down
switching converter with integrated internal highside and low-side power MOSFETs (HS-FET
and LS-FET, respectively). The device provides
4A of highly efficient output current (IOUT) with
current mode control.
The MPQ4314 features a wide input voltage (VIN)
range, configurable switching frequency (fSW),
external soft start (SS), and a precise current
limit. The device’s low operational quiescent
current (IQ) makes it well-suited for batterypowered applications.
PWM Control
At moderate to high output currents, the
MPQ4314 operates with fixed-frequency, peak
current control to regulate the output voltage
(VOUT). A PWM cycle is initiated by the internal
clock. At the rising edge of the clock, the HS-FET
turns on, and remains on until its current reaches
the value set by the internal COMP voltage
(VCOMP). The HS-FET stays on for at least 100ns.
When the HS-FET is off, the LS-FET
immediately turns on, and stays on until the next
cycle starts. The LS-FET remains on for at least
80ns before the next cycle starts.
If the current in the HS-FET does not reach the
value set by COMP within one PWM period, then
the HS-FET remains on, which saves a turn-off
operation. The HS-FET is forced off if it stays on
for about 10µs, even if it does not reach the value
set by COMP.
Light-Load Operation
Under light-load conditions, the MPQ4314 can
work in two different operation modes based on
the MODE pin.
The MPQ4314 works in forced continuous
conduction mode (FCCM) when the MODE pin
is pulled above 1.8V. In FCCM, the device works
with a fixed frequency from no-load to full-load
conditions. The advantage of FCCM is its
controllable frequency and lower output ripple
under light loads.
The MPQ4314 works in advanced asynchronous
modulation (AAM) mode when the MODE pin is
pulled below 0.4V. AAM mode optimizes
efficiency under
conditions.
light-load
and
no-load
When AAM mode is enabled, the MPQ4314
enters asynchronous operation while the
inductor current (IL) approaches 0A under light
loads (see Figure 6). If the load is further
decreased or there is no load, VCOMP drops to the
set value, and the MPQ4314 enters AAM mode.
Inductor
Current
Load
Decreased
Inductor
Current
AAM
FCCM
t
t
Load
t Decreased
t
t
t
Figure 6: AAM Mode and FCCM
In AAM mode, the internal clock resets when
VCOMP crosses the set value. The crossover time
is used as a benchmark for the next clock. When
the load increases and VCOMP exceeds the set
value, the device operates in discontinuous
conduction mode (DCM) or CCM, which both
have a constant fSW.
Error Amplifier (EA)
The error amplifier (EA) compares the FB pin
voltage (VFB) to the internal reference voltage
(VREF, about 0.815V), and outputs a current that
is proportional to the difference between the
voltages. This current charges the compensation
network to form VCOMP, which controls the power
MOSFET current.
During normal operation, the minimum VCOMP is
clamped to 0.9V, and its maximum is clamped to
2.0V. COMP is internally pulled down to GND
when the device shuts down.
Internal Regulator VCC
The internal 4.9V regulator (VCC) powers most
of the internal circuitry. This regulator uses VIN as
the input and operates in the full VIN range. When
VIN exceeds 4.9V, VCC is in full regulation. When
VIN is below 4.9V, the VCC output degrades.
Bootstrap (BST) Charging
The bootstrap (BST) capacitor (CBST) is charged
and regulated to about 5V by the dedicated
internal BST regulator. When the voltage
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
28
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
between the BST and SW nodes drops below its
regulated value, a P-channel MOSFET pass
transistor connected from VCC to BST turns on
to charge CBST. The external circuit should
provide enough voltage headroom to facilitate
charging. When the HS-FET is on, BST exceeds
VCC, which means that CBST cannot be charged.
Under higher duty cycles, there is less time for
CBST to charge, so it may not be charged
sufficiently. If the external circuit has an
insufficient voltage (or not enough time) to
charge CBST, use additional external circuitry to
ensure that the bootstrap voltage (VBST) remains
in the normal operation range.
Low-Dropout Mode and BST Refresh
To improve dropout, the MPQ4314 is designed
to operate at close to 100% duty cycle when the
difference between the voltages on the BST and
SW pins exceeds 2.5V. When the voltage from
BST to SW drops below 2.5V, the HS-FET turns
off using an under-voltage lockout (UVLO) circuit.
This allows the LS-FET to conduct and refresh
the charge on CBST. In DCM or pulse-skip mode
(PSM), the LS-FET is forced on to refresh VBST.
Since the supply current sourced from CBST is
low, the HS-FET can remain on for more
switching cycles than are required to refresh the
capacitor. As a result, the effective duty cycle of
the switching regulator is high.
The regulator’s effective duty cycle during
dropout is mainly influenced by the voltage drop
across the power MOSFET, the inductor
resistance, the low-side diode, and the PCB
resistance.
Enable Control
EN is a digital control pin that turns the regulator
on and off.
Enabled by an External Logic (High/Low)
Signal
When EN is pulled below its falling threshold
voltage (about 0.85V), the chip operates in its
lowest shutdown current mode. Force EN above
its rising threshold voltage (about 1V) to turn the
MPQ4314 on.
internal current source, the circuit can generate
a configurable VIN UVLO threshold and
hysteresis. Use resistor dividers to set the EN
voltage (see Figure 7).
VIN
REN1
EN
REN2
Figure 7: Enable Divider Circuit
Configurable Switching Frequency (fSW) and
Foldback
The MPQ4314’s oscillating frequency can be
configured via an external resistor (RFREQ)
connected from the FREQ pin to ground, or by a
logic level SYNC signal.
To set fSW, select RFREQ using the fSW vs. RFREQ
curve on page 15. Note that when fSW is set high,
it may fold back at high input voltages to avoid
triggering a minimum on time and forcing the
output out of regulation.
The fSW for car battery applications is between
350kHz and 1000kHz. Table 1 lists the
recommended RFREQ values for common
frequencies. Higher frequencies can be used in
applications that do not have a critical switching
frequency limit, as well as applications with a
low, stable VIN.
Table 1: RFREQ vs. fSW
RFREQ (kΩ)
86.6
80.6
75
62
59
54.9
49.9
45.3
41.2
37.4
34
30.9
28.7
26.1
fSW (kHz)
350
380
410
470
500
530
590
640
700
760
830
910
960
1000
Configurable VIN Under-Voltage Lockout
(UVLO)
When VIN is sufficiently high, the chip can be
enabled and disabled via the EN pin. With an
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
29
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
Frequency Spread Spectrum
The MPQ4314 uses a 12kHz modulation
frequency with a fixed 128-step triangular profile
to spread the internal oscillator frequency across
a 20% (±10%) window (see Figure 8). The steps
are fixed and independent of the set oscillator
frequency, which optimizes the frequency
spread spectrum (FSS) performance.
Steps Vary with
Oscillator
Frequency (Max
128 Steps)
fSPAN = 20% of fSW
fMOD = 12k
Figure 8: Spread Spectrum Scheme
Side bands are created by modulating fSW with a
triangle modulation waveform. This reduces the
emission power of the fundamental fSW, as well
as its harmonics, which then reduces peak EMI
noise.
Soft Start (SS)
Soft start (SS) is implemented to prevent the
converter’s VOUT from overshooting during startup.
When SS begins, an internal current source
begins charging the external soft-start capacitor
(CSS). When the soft-start voltage (VSS) is below
the internal reference voltage (VREF), VSS
overrides VREF, so the EA uses VSS as the
reference. When VSS exceeds VREF, the EA uses
VREF as the reference.
CSS can be calculated using Equation (1):
CSS (nF) =
t SS (ms) ISS (μA)
= 13.5 t SS (ms) (1)
VREF (V)
The SS pins can be used for tracking and
sequencing.
Pre-Biased Start-Up
If VFB exceeds VSS - 150mV during start-up, this
means that the output has a pre-biased voltage.
In the scenario, the HS-FET and LS-FET do not
turn on until VSS exceeds VFB.
Thermal Shutdown
Thermal shutdown is implemented to protect the
chip from thermal runaway. If the silicon die
temperature exceeds its upper threshold
(typically 170°C), the device shuts down the
power MOSFETs. Once the temperature falls
below the lower threshold (150°C), the chip is reenabled and resumes normal operation.
Current Comparator and Current Limit
The power MOSFET’s current is accurately
sensed via a current-sense MOSFET. This
current is then fed to the high-speed current
comparator for current mode control. The current
comparator uses this sensed current as one of
its inputs.
When the HS-FET turns on, the comparator is
blanked until the end of the turn-on transition to
mitigate noise. The comparator compares the
power MOSFET’s current to the value set by
VCOMP. When the sensed current exceeds the
value set by COMP, the comparator outputs low
to turn off the HS-FET. The internal power
MOSFET’s maximum current is internally limited
cycle by cycle.
Hiccup Protection
If the output is shorted to ground, VOUT may drop
below 70% of its nominal output. If this occurs,
the MPQ4314 shuts down momentarily and
begins discharging CSS. The device restarts with
a full soft start when CSS is fully discharged. This
process repeats until the fault is removed.
Start-Up and Shutdown
If both VIN and EN exceed their appropriate
thresholds, the chip starts up. The reference
block starts first, generating a stable reference
voltage and currents, and then the internal
regulator is enabled. The regulator provides a
stable supply for the remaining circuitries.
While the internal supply rail is up, an internal
timer keeps the power MOSFET off for about
50µs to blank any start-up glitches. When the SS
block is enabled, the SS output stays low to
ensure that the remaining circuitries are ready
before slowly ramping up.
Three events can shut down the chip: EN going
low, VIN going low, and thermal shutdown. When
shutdown is initiated, the signaling path is first
blocked to avoid any fault triggering. Next, VCOMP
and the internal supply rail are pulled down. The
floating driver is not subject to this shutdown
command, but its charging path is disabled.
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
30
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
Power Good (PG) Output
The MPQ4314 includes an open-drain power
good (PG) output. If using the PG pin, connect it
to a power source using a pull-up resistor. PG
goes high if VOUT is within 95% to 105% of the
nominal voltage. PG goes low if VOUT is above
106.5% or below 93.5% of the nominal voltage.
SYNCIN and SYNCO
fSW can be synchronized to the rising edge of the
clock signal applied at SYNCIN. The
recommended SYNCIN frequency range is
350kHz to 1000kHz. Ensure that SYNCIN’s off
time is shorter than the internal oscillator period.
Otherwise, the internal clock may turn on the HSFET before the rising edge of SYNCIN.
There is no limit for the SYNCIN pulse width, but
there is always parasitic capacitance on the pad.
If the pulse width is too short, a clear rising and
falling edge may not be achieved due to the
parasitic capacitance. It is recommended to
make the pulse longer than 100ns.
When using SYNCIN in AAM mode, drive
SYNCIN below its specified threshold (about
0.4V), or float the SYNCIN pin before starting up
the MPQ4314. Then add the external SYNCIN
clock. Connect a resistor from SYNCIN to GND
to avoid floating SYNCIN when using this
function. It recommended to use a 10kΩ to 51kΩ
resistor.
The SYNCO pin provides a default 180° phaseshifted clock for the internal oscillator. If there is
no external SYNCIN clock, SYNCO can provide
a clock that is phase-shifted 180° compared to
the internal clock.
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
31
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
APPLICATION INFORMATION
Setting the Output Voltage
The external resistor divider connected to FB
sets VOUT (see Figure 9).
MPQ4314
RFB1
FB
VOUT
Calculate RFB2 with Equation (2):
(2)
Tab 2 lists the recommended feedback resistor
values for common output voltages.
Table 2: Recommended Resistor Values for
Output Voltages
VOUT (V)
RFB1 (kΩ)
RFB2 (kΩ)
3.3
100 (1%)
32.4 (1%)
5
100 (1%)
19.6 (1%)
For most applications, use a 4.7µF to 10µF
capacitor. It is strongly recommended to use
another, lower-value capacitor (e.g. 0.1µF) with
a small package size (0603) to absorb highfrequency switching noise. Place the smaller
capacitor as close to VIN and GND as possible.
Since the input capacitor (CIN) absorbs the input
switching current, it requires an adequate ripple
current rating. Estimate the RMS current in the
input capacitor (ICIN) with Equation (3):
VOUT
V
(1 − OUT )
VIN
VIN
(4)
When using ceramic capacitors, ensure that they
have enough capacitance to provide a sufficient
charge to prevent an excessive voltage ripple at
the input. The input voltage ripple (∆VIN) caused
by the capacitance can be estimated with
Equation (5):
VIN =
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
due to their low ESR and small temperature
coefficients.
ICIN = ILOAD
ILOAD
2
The input capacitor can be electrolytic, tantalum,
or ceramic. When using electrolytic or tantalum
capacitors, place a small, high-quality ceramic
capacitor (e.g. 0.1μF) as close to the device as
possible.
Figure 9: Feedback Network
RFB1
VOUT
−1
0.815V
ICIN =
For simplification, choose an input capacitor with
an RMS current rating greater than half of the
maximum load current.
RFB2
RFB2 =
The worst-case condition occurs at VIN = 2 x
VOUT, calculated with Equation (4):
(3)
ILOAD
V
V
OUT (1 − OUT )
fSW CIN
VIN
VIN
(5)
Selecting the Output Capacitor
The output capacitor maintains the DC output
voltage. Use ceramic, tantalum, or low-ESR
electrolytic capacitors. For the best results, use
low-ESR capacitors to keep the output voltage
ripple low. The output voltage ripple (∆VOUT) can
be calculated with Equation (6):
VOUT =
VOUT
V
1
(1 − OUT ) (RESR +
) (6)
fSW L
VIN
8 fSW COUT
Where L is the inductance, 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 causes the majority of the output
voltage ripple. For simplification, the output
voltage ripple (∆VOUT) can be estimated with
Equation (7):
VOUT =
VOUT
V
(1 − OUT ) (7)
8 fSW L COUT
VIN
2
For tantalum or electrolytic capacitors, the ESR
dominates the impedance at the switching
frequency. For simplification, the output voltage
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
32
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
ripple (∆VOUT) can be calculated with Equation
(8):
VOUT
V
V
= OUT (1 − OUT ) RESR
fSW L
VIN
R UP
(9)
Where ∆IL is the peak-to-peak inductor ripple
current.
Choose the inductor ripple current to be
approximately 30% of the maximum load current.
The maximum inductor peak current (ILP) can be
calculated with Equation (10):
ILP
EN
RDOWN
Selecting the Inductor
A 1µH to 10µH inductor with a DC current rating
at least 25% greater than the maximum load
current is recommended for most applications.
For higher efficiency, choose an inductor with a
lower DC resistance. A larger-value inductor
results in less ripple current and a lower output
ripple voltage; however, also has a larger
physical size, higher series resistance, and lower
saturation current. A good rule to determine the
inductance is to allow the inductor ripple current
to be approximately 30% of the maximum load
current. The inductance (L) can be estimated
with Equation (9):
VOUT
V
(1 − OUT )
fSW IL
VIN
VIN
(8)
The characteristics of the output capacitor also
affect the stability of the regulation system. The
MPQ4314 can be optimized for a wide range of
capacitance and ESR values.
L=
VIN
VOUT
V
= ILOAD +
(1 − OUT ) (10)
2 fSW L
VIN
VIN Under-Voltage Lockout (UVLO) Setting
The MPQ4314 has an internal fixed undervoltage lockout (UVLO) threshold. The rising
threshold is 3V, and the falling threshold is about
2.7V. For applications that require a higher
UVLO point, place an external resistor divider
between VIN and EN to raise the equivalent
UVLO threshold (see Figure 10).
Figure 10: Adjustable UVLO Using EN Divider
The UVLO rising and falling thresholds can be
calculated with Equation (11) and Equation (12),
respectively:
VIN _ UVLO _ RISING = (1 +
RUP
) VEN _ RISING (11)
RDOWN
VIN _ UVLO _ FALLING = (1 +
RUP
) VEN _ FALLING (12)
RDOWN
Where VEN_RISING is 1V, and VEN_FALLING is 0.85V.
Selecting the External BST Diode and
Resistor
An external BST diode can enhance the
regulator’s efficiency when the duty cycle is high.
A power supply between 2.5V and 5V can be
used to power the external BST diode. It is
recommended to make VCC or VOUT the power
supply in the circuit (see Figure 11).
VCC
RBST
External BST Diode
IN4148
BST
VCC / VOUT
CBST
L
VOUT
SW
COUT
Figure 11: Optional External Bootstrap Diode to
Enhance Efficiency
The recommended external BST diode is
IN4148, and the recommended CBST value is
between 0.1µF and 1μF. Connect a resistor
(RBST) in series with CBST to reduce the SW rising
rate and voltage spikes. This enhances EMI
performance and reduces voltage stress at
higher input voltages. A higher resistance
reduces SW spikes but compromises efficiency.
It is recommended for RBST to be ≤20Ω.
Selecting the VCC Capacitor
The VCC capacitor should be 10 times greater
than the boost capacitor. A VCC capacitor above
68µF (nominal) is not recommended.
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
33
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
PCB Layout Guidelines (9)
Efficient PCB layout, especially input capacitor
placement, is critical for stable operation. A 4layer layout is strongly recommended to achieve
better thermal performance. For the best results,
refer to Figure 12 and follow the guidelines below:
1.
Place symmetric input capacitors as close to
VIN and GND as possible.
2.
Connect a large copper plane directly to
PGND.
3.
If the bottom layer is a ground plane, add
vias near PGND.
4.
Ensure that the high-current paths at GND
and VIN have short, direct, and wide traces.
5.
Place the ceramic input capacitor, especially
the small package size (0603) input bypass
capacitor, as close to VIN and PGND as
possible to minimize high-frequency noise.
6.
Keep the connection between the input
capacitor and VIN as short and wide as
possible.
7.
Place the VCC capacitor as close to VCC
and GND as possible.
8.
Route SW and BST away from sensitive
analog areas, such as FB.
9.
Place the feedback resistors close to the
chip to ensure that the trace connected to
FB is as short as possible.
Top Layer
Mid-Layer 1
Mid-Layer 2
10. Use multiple vias to connect the power
planes to the internal layers.
Note:
9) The recommended PCB layout is based on Figure 13 on page
35.
Bottom Layer
Figure 12: Recommended PCB Layout
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
34
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
6
TYPICAL APPLICATION CIRCUITS
VIN = 3.3V to 45V
3, 12
C1C
C1A C1B
GND
10µF 10µF 0.1µF
EN
VIN
C1D
Typ 8A
ILIMIT
MPQ4314
0.85V 1V
9 EN
20
FREQ
SS
VOUT
R4
100k
GND
R5
32.4k
PG 14
PG
R6
100k
2
SYNCIN
16
VCC
R3
51k
C6
4.7µF FCCM
3
NC 15
MODE 1
2
JP1
AAM
4, 5,
10, 11
17 AGND
PGND
13 SYNCO
1
SYNCO
4.7µH
Typ 0.815V
C3
22nF
SYNCIN
3.3V/4A
C2A C2B
C5
47µF 47µF
10V
47pF 10V
1210 1210
18
FB
R2
62k
19
L1
7, 8
SW
R1
100k
0.1µF
C4
0.1µF
BST
U1
Figure 13: Typical Application Circuit (VOUT = 3.3V, fSW = 470kHz)
4.7µH VIN
BLM41PG600SN1L
VEMI
CIN1
CIN2
1nF
10nF
GND
L1
C1B
C1C
VIN
C1D
10µF 10µF 0.1µF 0.1µF
L2
CIN5
47µF
C4
0.1µF
SW
R1
7, 8
L3
Typ 8A 4.7µH
100k
ILIMIT
MPQ4314
9
EN
20
FREQ
18
FB Typ 0.815V
R2
62k
19
SS
PG
10V
1210
10V
1210
10nF 1nF
10nF 1nF
GND
R5
19.6k
COUT2
COUT4
PG
R6
100k
NC
17
PGND
MODE
16
15
C6
4.7µF
3
VCC
SYNCO
AGND
13
SYNCIN
1
2
JP1
4, 5,
10, 11
2
R3
51k
47pF
5V/4A
VOUT
COUT3
14
C3
22nF
SYNCIN
C5
C2B
47µF
R4
100k
EN 0.85V 1V
SYNCO
COUT1
C2A
47µF
1
C1A
GND
3, 12
BST
VIN = 3.3V to 45V
CIN4
1µF
6
U1
CIN3
1µF
Figure 14: Typical Application Circuit (VOUT = 5V, fSW = 470kHz with EMI Filters)
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
35
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
6
TYPICAL APPLICATION CIRCUITS (continued)
VIN = 3.3V to 45V
C1A C1B
C1C
GND 10µF 10µF 0.1µF
C4
0.1µF
BST
U1
3, 12 VIN
C1D
0.1µF
SW
R1
4A
C2A C2B C2C C2D
47µF 47µF 22µF 22µF
4.7uH
Typ 8A ILIMIT
100k
EN
L1
7,8
10V
1210
MPQ4314
0.85V 1V
9 EN
20
FREQ
FB
18
10V 10V
1210 1210
10V
1210
VOUT
GND
R2
62k
SS
PG 14
R4
100k
SYNCIN
2
SYNCIN
VCC
R3
51k
16
15
C5
4.7µF FCCM
2
1
MODE 1
4,5,10,
11
13 SYNC
O
PGND
NC
17 AGND
SYNCO
PG
3
19
C3
22nF
JP1
AAM
Figure 15: Typical Application Circuit (fSW = 470kHz, 3.3V Fixed Output)
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
36
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
PACKAGE INFORMATION
QFN-20 (4mmx4mm)
Wettable Flank
PIN 1 ID
PIN 1 ID
MARKING
PIN 1 ID
INDEX AREA
0.10x45°
TOP VIEW
BOTTOM VIEW
SIDE VIEW
SECTION A-A
NOTE:
1) THE LEAD SIDE IS WETTABLE.
2) ALL DIMENSIONS ARE IN MILLIMETERS.
3) LEAD COPLANARITY SHALL BE 0.08
MILLIMETERS MAX.
4) JEDEC REFERENCE IS MO-220.
5) DRAWING IS NOT TO SCALE.
RECOMMENDED LAND PATTERN
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
37
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
CARRIER INFORMATION
1
Pin1
1
ABCD
1
1
ABCD
ABCD
ABCD
Feed Direction
Part Number
MPQ4314GRE-AEC1-Z
Package
Description
QFN-20
(4mmx4mm)
Quantity/
Reel
Quantity/
Tube (10)
Reel
Diameter
Carrier Tape
Width
Carrier
Tape Pitch
5000
N/A
13in
12mm
8mm
Note:
10) N/A indicates not available in tubes. For 500-piece tape & reel prototype quantities, contact MPS. The order code for 500-piece partial reels
is “-P”, and the tape & reel dimensions same as full reel.
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
38
MPQ4314 – 45V, 4A, LOW IQ, SYNC STEP-DOWN CONVERTER WITH FSS, AEC-Q100
REVISION HISTORY
Revision #
Revision Date
1.0
11/03/2021
Description
Pages Updated
Initial Release
-
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.
MPQ4314 Rev. 1.0
www.MonolithicPower.com
11/3/2021
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
39
工商网监
湘ICP备2023018690号
