MP4316
45V, 6A, Low IQ, Synchronous
Step-Down Converter with
Frequency Spread Spectrum
DESCRIPTION
FEATURES
The MP4316 is a frequency-configurable,
synchronous, step-down switching converter
with integrated internal high-side and low-side
power MOSFETs (HS-FET and LS-FET,
respectively). It can achieve up to 6A of highly
efficient, continuous output current (IOUT) with
current control mode for fast loop response.
The wide 3.3V to 45V input voltage (VIN) range
accommodates a variety of step-down
applications in an automotive input environment.
The device’s 1.7μA shutdown current (ISD)
makes it ideal for battery-powered applications.
The MP4316 provides high power conversion
efficiency across the entire load range.
Advanced asynchronous modulation (AAM)
mode achieves high efficiency under light-load
conditions by scaling down the switching
frequency (fSW) to reduce the switching and gate
driver losses.
An open-drain power good (PG) signal indicates
whether the output is between 95% and 105% of
its nominal voltage. High duty cycle and lowdropout (LDO) mode enable the device to
withstand automotive cold-crank conditions.
Full protection features include frequency
foldback to prevent inductor current (IL) runaway
during start-up, over-current protection (OCP)
with hiccup mode, and thermal shutdown for
reliable, fault-tolerant operation.
The MP4316 is available
(4mmx4mm) package.
in
a
QFN-20
Wide 3.3V to 45V Operating Input (VIN)
Voltage Range
Up to 6A of Continuous Output Current
(IOUT)
Low 1.7μA Shutdown Current (ISD)
18μA Sleep Mode Quiescent Current (IQ)
Internal 48mΩ and 20mΩ Power MOSFETs
350kHz to 1000kHz Configurable Switching
Frequency (fSW) for Car Battery Applications
External SYNC Clock
Out-of-Phase Synchronized Clock Output
Frequency Spread Spectrum (FSS) for Low
Electromagnetic Interference (EMI)
Symmetric VIN for Low EMI
Power Good (PG) Output
External Soft Start (SS)
100ns Minimum On Time (tON_MIN)
Selectable Advanced Asynchronous
Modulation (AAM) Mode or Forced
Continuous Conduction Mode (FCCM)
Low-Dropout (LDO) Mode
Over-Current Protection (OCP) with Hiccup
Mode
Available in a QFN-20 (4mmx4mm)
Package
Available in a Wettable Flank Package
APPLICATIONS
Radios
Battery-Powered Systems
General-Purpose Consumer Applications
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.
MP4316 Rev. 1.0
9/22/2021
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1
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL APPLICATION
Efficiency vs. Load Current
VIN =
3.3 to 45V
EN
VIN
BST
100
MODE
90
SYNCO
SW
MP4316
FREQ
FB
VCC
PG
NC
SS
SYNCIN
GND
80
EFFICIENCY (%)
VOUT
VOUT = 5V, fSW = 470kHz, L = 4.7μH,
DCR = 15mΩ, AAM
70
60
50
40
30
VIN=12V
VIN=24V
VIN=36V
VIN=45V
20
10
0
0.1
1
10
100
1000
6000
LOAD CURRENT (mA)
MP4316 Rev. 1.0
9/22/2021
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2
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
ORDERING INFORMATION
Part Number*
MP4316GRE***
Package
QFN-20 (4mmx4mm)
Top Marking
See Below
MSL Rating**
1
* For Tape & Reel, add suffix -Z (e.g. MP4316GRE-Z).
** Moisture Sensitivity Level Rating
*** Wettable Flank
TOP MARKING
MPS: MPS prefix
Y: Year code
WW: Week code
MP4316: 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)
MP4316 Rev. 1.0
9/22/2021
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3
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
PIN FUNCTIONS
Pin #
1
2
3, 12
4, 5,
10, 11
6
7, 8
9
13
14
15
16
17
18
19
20
Name
Description
Mode selection. Pull the MODE pin high to make the converter operate in forced continuous
conduction mode (FCCM). Pull MODE low to make the converter operate in advanced
asynchronous modulation (AAM) mode. Do not float MODE.
Synchronous input. Apply a 350kHz and 1000kHz clock signal to the SYNCIN pin to
synchronize the internal oscillator frequency to the external clock. SYNCIN has an internal
high impedance (Hi-Z). If using SYNCIN, ensure that the external SYNC clock has an
SYNCIN adequate pull-up and pull-down resistance. If the external clock’s pull-down resistance is not
sufficient, or if SYNCIN enters a Hi-Z state, place a ≤51kΩ resistor between the SYNCIN
pin and AGND. Do not float SYNCIN.
Input supply. The VIN pin powers the internal circuitry and the high-side MOSFET (HS-FET)
VIN
connected to the SW pin. To minimize switching spikes at the input, connect a decoupling
capacitor between the VIN pin and PGND. Place this capacitor close to VIN.
MODE
PGND
Power ground.
Bootstrap. The BST pin is the positive power supply for the HS-FET. Connect a bypass
capacitor between the BST and SW pins. For more information, see the Selecting the External
Bootstrap (BST) Diode and Resistor section on page 32.
SW
Switch output. The SW pin is the output of the internal power MOSFETs.
EN
Enable. Pull the EN pin above 1V to turn the converter on; pull EN below 0.85V to turn it off.
Synchronous output. The SYNCO pin outputs a clock that is 180° out-of-phase with the
SYNCO internal oscillator. SYNCO can also output a signal opposite of the clock applied at the
SYNCIN pin. Float SYNCO if not used.
Power good indicator. The PG pin is an open-drain output. Connect PG to a power source
via a pull-up resistor. If the output voltage (VOUT) is between 95% and 105% of the nominal
PG
voltage, PG is pulled high. If VOUT exceeds 106.5% or drops below 93% of the nominal
voltage, PG is pulled low.
NC
Not connected. Float the NC pin if not used.
Bias supply. The VCC pin supplies 4.9V to the internal control circuit and gate drivers.
VCC
Connect a decoupling capacitor from VCC to AGND. Place this capacitor close to VCC. For
information, see the Selecting the VCC Capacitor (CVCC) section on page 32.
AGND Analog ground.
Feedback input. To set VOUT, connect the FB pin to the center of the external resistor divider
FB
connected between the output and AGND. The feedback (FB) voltage (VFB) is about 0.815V.
Place the resistor divider as close to FB as possible. Keep vias away from the FB traces.
Soft-start input. Place a capacitor between the SS pin and AGND to set the soft-start time
SS
(tSS). During start-up, SS provides 13µA to the soft-start capacitor (CSS). As the SS voltage
(VSS) increases, VFB increases to limit the input inrush current during start-up.
Switching frequency setting. Connect a resistor from the FREQ pin to AGND to set the
FREQ
switching frequency (fSW). For more information, see the fSW vs. RFREQ curves on page 15.
BST
MP4316 Rev. 1.0
9/22/2021
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4
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
θJA
θJC
ABSOLUTE MAXIMUM RATINGS (1)
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) (2) (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
EVQ4316-R-00A (5).................23........2.5..°C/W
ESD Ratings
Human body model (HBM) ........................ ±2kV
Charged device model (CDM) .................. ±750V
Recommended Operating Conditions
Input voltage (VIN) ........................... 3.3V to 45V
Output voltage (VOUT)......... 0.815V to 0.95 x VIN
Operating junction temp (TJ) -40°C to +125°C (3)
MP4316 Rev. 1.0
9/22/2021
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX) - TA) / θJA. Exceeding the maximum allowable power
dissipation can cause excessive die temperature, and the
converter may go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) An operating junction temperature above 125°C may be
supported. Contact MPS for details.
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 evaluation board (9cmx9cm),
thick 2oz copper, 4-layer PCB.
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
ELECTRICAL CHARACTERISTICS
VIN = 12V, VEN = 2V, TJ = -40°C to +125°C (6), typical values are at TJ = 25°C, unless otherwise noted.
Parameter
Symbol
VIN under-voltage lockout
VIN UVLO_
(UVLO) rising threshold
RISING
VIN UVLO falling
VIN_UVLO_
threshold
FALLING
VIN UVLO_HYS
VIN UVLO hysteresis
VCC voltage
VCC
VCC voltage regulation
ILIMIT_VCC
VCC current limit
Quiescent current during
ISLEEP
sleep mode
Quiescent current (7)
IQ
Shutdown current
ISD
Feedback (FB) voltage
VFB
FB current
IFB
Switching frequency
fSW
Minimum on time (7)
Minimum off time (7)
SYNCIN voltage rising
threshold
SYNCIN voltage falling
threshold
SYNCIN clock range
SYNCO high voltage
SYNCO low voltage
SYNCO phase shift
High-side MOSFET (HSFET) peak current limit
Low-side MOSFET (LSFET) valley current limit
Zero-current detection
(ZCD) current
LS reverse current limit
Switch leakage current
HS-FET on resistance
LS-FET on resistance
Soft-start current
EN rising threshold
EN falling threshold
EN hysteresis
MODE rising threshold
MODE falling threshold
MP4316 Rev. 1.0
9/22/2021
Condition
IVCC = 0A
IVCC = 30mA
VCC = 4V
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, sleep mode, no load
MODE is low, advanced asynchronous
modulation (AAM) mode, no load,
switching, RFB_PU = 1MΩ, RFB_PD = 324kΩ
MODE is high, forced continuous
conduction mode (FCCM), switching, no
load, fSW = 2MHz
MODE is high, FCCM, no load, switching,
fSW = 470kHz
VEN = 0V
VIN = 3.3V to 45V, TJ = 25°C
VIN = 3.3V to 45V
VFB = 0.85V
RFREQ = 62kΩ
RFREQ = 26.1kΩ
tON_MIN
tOFF_MIN
VSYNC_RISING
20
μA
40
mA
9.5
mA
1.7
3.5
0.807 0.815 0.823
0.799 0.815 0.831
-50
0
+50
420
470
520
820 1000 1180
100
80
μA
V
V
nA
1.8
ILIMIT_PEAK
30% duty cycle
ILIMIT_VALLEY
IZCD
ILIMIT_REVERSE
ISW_LKG
RDS(ON)_HS
RDS(ON)_LS
ISS
VEN_RISING
VEN_FALLING
VEN_HYS
VMODE_RISING
VMODE_FALLING
AAM mode
FCCM
VBST - VSW = 5V
VCC = 5V
VSS = 0V
350
3.3
ns
ns
V
VSYNC_FALLING
fSYNC
External clock
VSYNCO_HIGH ISYNCO = -1mA
VSYNCO_LOW ISYNCO = 1mA
Tested under SYNCIN
kHz
0.4
V
1000
kHz
V
V
Deg
4.5
0.4
180
10
13
16
A
8
10
12
A
-0.15
0.1
+0.35
A
2
4.5
0.01
48
20
13
1
0.85
190
7
1
80
40
19
1.2
1.05
A
µA
mΩ
mΩ
µA
V
V
mV
V
V
8
0.8
0.65
1.8
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0.4
6
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, VEN = 2V, TJ = -40°C to +125°C (6), typical values are at TJ = 25°C, unless otherwise noted.
Parameter
Symbol
PG rising threshold
VPG_RISING
PG falling threshold
VPG_FALLING
PG output low voltage
PG rising delay
VPG_LOW
tPG_DELAY_
Condition
VFB rising, VFB / VREF
VFB falling, VFB / VREF
VFB falling, VFB / VREF
VFB rising, VFB / VREF
ISINK = 1mA
35
µs
35
µs
TSD
170
°C
TSD_HYS
20
°C
RISING
tPG_DELAY_
PG falling delay
FALLING
Thermal shutdown (7)
Thermal shutdown
hysteresis (7)
Min
Typ
Max Units
92
95
98
102
105
108
% of
90.5 93.5 96.5 VREF
103.5 106.5 109.5
0.1
0.3
V
Notes:
6) Guaranteed by over-temperature correlation. Not tested in production.
7) Derived from bench characterization. Not tested in production.
.
MP4316 Rev. 1.0
9/22/2021
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
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
21
0.816
VFB (V)
IQ (μA)
20
0.815
19
18
0.814
17
0.813
16
0.812
15
-50
-25
0
25
50
75
100
-50
125
-25
TEMPERATURE (°C)
15.0
14.5
ILIMIT_VALLEY (A)
ILIMIT (A)
14.0
13.5
13.0
12.5
12.0
11.5
11.0
-25
0
25
50
75
100
125
100
125
11.0
10.8
10.6
10.4
10.2
10.0
9.8
9.6
9.4
9.2
9.0
-50
125
-25
TEMPERATURE (°C)
Reverse Current Limit vs.
Temperature
0
25
50
75
TEMPERATURE (°C)
VIN UVLO Threshold vs.
Temperature
3.1
5.0
4.8
4.6
4.4
4.2
4.0
3.8
3.6
3.4
3.2
3.0
V IN UVLO THRESHOLD (V)
ILIMIT_REVERSE (A)
100
Valley Current Limit vs.
Temperature
Current Limit vs. Temperature
-50
0
25
50
75
TEMPERATURE (°C)
-50
MP4316 Rev. 1.0
9/22/2021
-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
100
125
TEMPERATURE (°C)
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL CHARACTERISTICS (continued)
VIN = 12V, TJ = -40°C to +125°C, unless otherwise noted.
EN UVLO Threshold vs.
Temperature
PG Threshold vs. Temperature
PG THRESHOLD (% OF V REF)
EN UVLO THRESHOLD (V)
1.05
1.00
0.95
EN UVLO Rising
EN UVLO Falling
0.90
0.85
0.80
-50
-25
0
25
50
75
100
110
108
106
104
102
100
98
96
94
92
90
88
PG Upper Falling Threshold
PG Lower Rising Threshold
PG Upper Rising Threshold
PG Lower Falling Threshold
-50
125
-25
TEMPERATURE (°C)
2.2
70
2.1
65
2.0
60
RDS(ON)_HS (mΩ)
ISD (μA)
25
50
75
100
125
HS-FET On Resistance vs.
Temperature
Shutdown Current vs. Temperature
1.9
1.8
1.7
1.6
55
50
45
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)
100
125
VCC vs. Temperature
4.96
30
4.95
28
4.94
26
4.93
V CC (V)
RDS(ON)_LS (mΩ)
0
TEMPERATURE (°C)
24
22
4.92
4.91
4.90
20
4.89
18
4.88
16
-50
MP4316 Rev. 1.0
9/22/2021
-25
0
25
50
75
TEMPERATURE (°C)
100
125
4.87
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL CHARACTERISTICS (continued)
VIN = 12V, TJ = -40°C to +125°C, unless otherwise noted.
Zero-Current Detection vs.
Temperature
150
130
ZCD (mA)
ISS (μA)
Soft-Start Current vs. Temperature
16.0
15.5
15.0
14.5
14.0
13.5
13.0
12.5
12.0
11.5
11.0
10.5
10.0
110
90
70
50
-50
-25
0
25
50
75
TEMPERATURE (°C)
100
125
100
125
-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
MP4316 Rev. 1.0
9/22/2021
-25
0
25
50
75
TEMPERATURE (°C)
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VOUT = 3.3V, L = 4.7μH (8), fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
Input Current vs. Load Current
Input Current vs. Load Current
70
65
60
55
50
45
40
35
30
25
20
15
AAM mode, VOUT = 5V
110
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 45V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 45V
100
INPUT CURRENT (µA)
INPUT CURRENT (µA)
AAM mode, VOUT = 3.3V
90
80
70
60
50
40
30
20
10
20
30
40
50
60
70
80
10
90 100
Efficiency vs. Load Current
70
EFFICIENCY (%)
EFFICIENCY (%)
80
60
50
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 45V
40
30
20
10
1
0.5
LOAD CURRENT (mA)
5
10
80
90 100
100
50
LOAD CURRENT (mA)
500 1000
Efficiency vs. Load Current
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 45V
4000
5000
LOAD CURRENT (mA)
EFFICIENCY (%)
EFFICIENCY (%)
70
FCCM, VOUT = 3.3V
100
98
96
94
92
90
88
86
84
82
80
MP4316 Rev. 1.0
9/22/2021
60
Vin=12V
Vin=24V
Vin=36V
Vin=45V
10
AAM mode, VOUT = 3.3V
3000
50
100
95
90
85
80
75
70
65
60
55
50
Efficiency vs. Load Current
2000
40
AAM mode, VOUT = 3.3V
90
1000
30
Efficiency vs. Load Current
AAM mode, VOUT = 3.3V
0.1
20
LOAD CURRENT (µA)
LOAD CURRENT (µA)
6000
20
18
16
14
12
10
8
6
4
2
0
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 45V
0.1
1
5
0.5
LOAD CURRENT (mA)
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11
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VOUT = 3.3V, L = 4.7μH (8), fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
Efficiency vs. Load Current
Efficiency vs. Load Current
FCCM, VOUT = 3.3V
100
100
90
98
80
96
70
EFFICIENCY (%)
EFFICIENCY (%)
FCCM, VOUT = 3.3V
60
50
40
30
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 45V
20
10
0
94
92
90
88
86
84
82
80
10
100
50
LOAD CURRENT (mA)
500
1000
1000
Efficiency vs. Load Current
70
EFFICIENCY (%)
EFFICIENCY (%)
80
60
50
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 45V
30
20
10
0.1
1
0.5
LOAD CURRENT (mA)
5
100
95
90
85
80
75
70
65
60
55
50
10
1000
EFFICIENCY (%)
FCCM, VOUT = 5V
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 45V
MP4316 Rev. 1.0
9/22/2021
50
500
100
LOAD CURRENT (mA)
Efficiency vs. Load Current
AAM mode, VOUT = 5V
1000
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 45V
10
Efficiency vs. Load Current
100
98
96
94
92
90
88
86
84
82
80
6000
AAM mode, VOUT = 5V
90
40
2000
3000
4000
5000
LOAD CURRENT (mA)
Efficiency vs. Load Current
AAM mode, VOUT = 5V
EFFICIENCY (%)
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 45V
2000
3000
4000
5000
LOAD CURRENT (mA)
6000
24
22
20
18
16
14
12
10
8
6
4
2
0
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 45V
0.1
0.5
1
LOAD CURRENT (mA)
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10
12
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 12V, VOUT = 3.3V, L = 4.7μH (8), fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
Efficiency vs. Load Current
Efficiency vs. Load Current
FCCM, VOUT = 5V
100
100
90
98
80
96
70
EFFICIENCY (%)
EFFICIENCY (%)
FCCM, VOUT = 5V
60
50
40
30
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 45V
20
10
50
500
100
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
6000
FCCM, VOUT = 3.3V
0.10
0.10
Vin=12V
Vin=24V
Vin=36V
Vin=45V
0.08
0.06
0.04
LOAD REGULATION (%)
LOAD REGULATION (%)
3000
4000
5000
LOAD CURRENT (mA)
Load Regulation
AAM mode, VOUT = 3.3V
0.02
0.00
-0.02
-0.04
0.08
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 45V
0.06
0.04
0.02
0.00
-0.02
-0.04
-0.06
-0.06
10
100
1000
LOAD CURRENT (mA)
10
6000
Line Regulation
100
1000
LOAD CURRENT (mA)
6000
Line Regulation
AAM mode, VOUT = 3.3V
FCCM, VOUT = 3.3V
0.06
0.08
IOUT = 10mA
IOUT = 3A
IOUT = 6A
0.04
IOUT = 10mA
IOUT = 3A
IOUT = 6A
0.06
LINE REGULATION (%)
LINE REGULATION (%)
2000
0.02
0.00
-0.02
-0.04
-0.06
0.04
0.02
0.00
-0.02
-0.04
-0.06
-0.08
5
MP4316 Rev. 1.0
9/22/2021
10
15
20 25
VIN (V)
30
35
40
45
5
10
15
20
25
VIN (V)
30
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40
45
13
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH (8), fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
Load Regulation
Load Regulation
AAM mode, VOUT = 5V
FCCM, VOUT = 5V
0.10
0.08
LOAD REGULATION (%)
0.06
0.04
LOAD REGULATION (%)
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 45V
0.08
0.02
0.00
-0.02
-0.04
0.06
0.04
0.02
0.00
-0.02
-0.04
-0.06
10
10
6000
100
1000
LOAD CURRENT (mA)
Line Regulation
0.03
0.03
LINE REGULATION (%)
LINE REGULATION (%)
0.04
0.02
0.01
0.00
-0.01
IOUT = 10mA
IOUT = 3A
IOUT = 6A
-0.03
6000
FCCM, VOUT = 5V
0.04
-0.02
100
1000
LOAD CURRENT (mA)
Line Regulation
AAM mode, VOUT = 5V
-0.04
IOUT = 10mA
IOUT = 3A
IOUT = 6A
0.02
0.01
0.00
-0.01
-0.02
-0.03
-0.04
5
10
15
20 25
VIN (V)
30
35
40
45
5
Case Temperature Rise
CASE TEMPERATURE RISE
( C)
40
35
30
25
20
15
10
5
0
MP4316 Rev. 1.0
9/22/2021
1
15
20 25
VIN (V)
30
35
40
45
VOUT = 5V
45
0
10
Case Temperature Rise
VOUT = 3.3V
CASE TEMPERATURE RISE
(°C)
VIN = 12V
VIN = 24V
VIN = 36V
VIN = 45V
2
3
4
LOAD CURRENT (A)
5
6
50
45
40
35
30
25
20
15
10
5
0
0
1
2
3
4
5
6
LOAD CURRENT (A)
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14
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH (8), fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
fSW vs. RFREQ
fSW vs. RFREQ
RFREQ = 10kΩ to 30kΩ
RFREQ = 30kΩ to 100kΩ
2400
900
2250
800
2100
fSW (kHz)
fSW (kHz)
1950
1800
1650
1500
700
600
500
1350
1200
400
1050
900
300
10 12 14 16 18 20 22 24 26 28 30
30
40
50
60
70
80
90
100
RFREQ (kΩ)
RFREQ (kΩ)
Low-Dropout Mode
2400
2200
2000
1800
1600
1400
1200
1000
800
600
400
200
VOUT = 5V
5.2
RFREQ = 62kΩ
RFREQ = 12kΩ
4.9
4.6
4.3
VOUT (V)
fsw (kHz)
fSW vs. VIN
4.0
IOUT = 0A
IOUT = 1A
IOUT = 2A
IOUT = 3A
IOUT = 4A
IOUT = 5A
IOUT = 6A
3.7
3.4
3.1
2.8
2.5
6 9 12 15 18 21 24 27 30 33 36 39 42 45
VIN (V)
MP4316 Rev. 1.0
9/22/2021
3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7 6.0
VIN (V)
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15
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 5V, IOUT = 6A, L = 4.7μH (8), fSW = 410kHz, TA = 25°C, unless otherwise noted. (9)
CISPR25 Class 5 Peak Conducted
Emissions
CISPR25 Class 5 Average Conducted
Emissions
150kHz to 108MHz
CISPR25 CLASS 5 PK LIMITS
AVG CONDUCTED EMI (dBµV)
PK CONDUCTED EMI (dBµV)
150kHz to 108MHz
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
-5
-10
-15
-20
PK NOISE FLOOR
0.1
1
Frequency (MHz)
108
10
75
70
65
60
CISPR25 CLASS 5 AVG LIMITS
55
50
45
40
35
30
25
20
15
10
5
0
-5
-10
-15
-20 AVG NOISE FLOOR
0.1
CISPR25 Class 5 Peak Radiated
Emissions
150kHz to 30MHz
150kHz to 30MHz
60
55
55
CISPR25 CLASS 5 PK LIMITS
50
AVG RADIATED EMI (dBµV)
50
PK RADIATED EMI (dBµV)
108
10
CISPR25 Class 5 Average Radiated
Emissions
60
45
40
35
30
25
20
15
10
45
40
35
CISPR25 CLASS 5 AVG LIMITS
30
25
20
15
10
5
5
0
0
PK NOISE FLOOR
-5
-5
AVG NOISE FLOOR
-10
-10
0.1
1 Frequency (MHz)
30
10
0.1
CISPR25 Class 5 Peak Radiated
Emissions
1
30
10
Frequency (MHz)
CISPR25 Class 5 Average Radiated
Emissions
Horizontal, 30MHz to 1GHz
Horizontal, 30MHz to 1GHz
55
55
HORIZONTAL POLARIZATION
45
CISPR25 CLASS 5 PK LIMITS
40
35
30
25
20
15
10
PK NOISE FLOOR
5
45
40
35
30
25
15
10
5
0
-5
-5
130
MP4316 Rev. 1.0
9/22/2021
230
CISPR25 CLASS 5 AVG LIMITS
20
0
30
HORIZONTAL POLARIZATION
50
AVG RADIATED EMI (dBµV)
50
PK RADIATED EMI (dBµV)
Frequency (MHz)
1
330
430
530
Frequency (MHz)
630
730
830
930
AVG NOISE FLOOR
30
130
230
330
430
530
Frequency (MHz)
630
730
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830
930
16
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 5V, IOUT = 6A, L = 4.7μH (8), fSW = 410kHz, TA = 25°C, unless otherwise noted. (9)
CISPR25 Class 5 Peak Radiated
Emissions
CISPR25 Class 5 Average Radiated
Emissions
Vertical, 30MHz to 1GHz
Vertical, 30MHz to 1GHz
55
55
VERTICAL POLARIZATION
50
CISPR25 CLASS 5 PK LIMITS
40
35
30
25
20
15
10
PK NOISE FLOOR
5
45
40
35
30
25
15
10
5
0
-5
-5
130
230
CISPR25 CLASS 5 AVG LIMITS
20
0
30
VERTICAL POLARIZATION
50
AVG RADIATED EMI (dBµV)
PK RADIATED EMI (dBµV)
45
330
430
530
Frequency (MHz)
630
730
830
930
AVG NOISE FLOOR
30
130
230
330
430
530
Frequency (MHz)
630
730
830
930
Notes:
8) Inductor part number: XAL6060-472MEC (DCR = 15mΩ).
9) The EMC test results are based on Figure 11 on page 35.
MP4316 Rev. 1.0
9/22/2021
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17
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM, TA = 25°C, unless otherwise noted.
Steady State
Steady State
IOUT = 0A, AAM mode
IOUT = 0A, FCCM
CH2:
VOUT/AC
10mV/div.
CH2:
VOUT/AC
50mV/div.
CH4: IL
1A/div.
CH4: IL
1A/div.
CH1: VSW
5V/div.
CH1: VSW
5V/div.
1μs/div.
40ms/div.
Steady State
Start-Up through VIN
IOUT = 6A
IOUT = 0A, AAM mode
CH2:
VOUT/AC
10mV/div.
CH3: VIN
5V/div.
CH2: VOUT
1V/div.
CH4: IL
1A/div.
CH4: IL
2A/div.
CH1: VSW
5V/div.
CH1: VSW
10V/div.
1μs/div.
1ms/div.
Start-Up through VIN
Start-Up through VIN
IOUT = 0A, FCCM
IOUT = 6A
CH3: VIN
5V/div.
CH3: VIN
5V/div.
CH2: VOUT
1V/div.
CH2: VOUT
1V/div.
CH4: IL
2A/div.
CH4: IL
5A/div.
CH1: VSW
10V/div.
CH1: VSW
10V/div.
1ms/div.
MP4316 Rev. 1.0
9/22/2021
1ms/div.
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM, 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.
CH4: IL
1A/div.
CH2: VOUT
1V/div.
CH2: VOUT
1V/div.
CH4: IL
2A/div.
CH1: VSW
10V/div.
CH1: VSW
5V/div.
10ms/div.
10ms/div.
Shutdown through VIN
Start-Up through EN
IOUT = 6A
IOUT = 0A, AAM mode
CH3: VEN
2V/div.
CH3: VIN
5V/div.
CH2: VOUT
1V/div.
CH2: VOUT
1V/div.
CH4: IL
5A/div.
CH1: VSW
10V/div.
CH4: IL
2A/div.
CH1: VSW
10V/div.
400µs/div.
1ms/div.
Start-Up through EN
Start-Up through EN
IOUT = 0A, FCCM
IOUT = 6A
CH3: VEN
2V/div.
CH3: VEN
2V/div.
CH2: VOUT
1V/div.
CH2: VOUT
1V/div.
CH4: IL
2A/div.
CH4: IL
5A/div.
CH1: VSW
10V/div.
CH1: VSW
10V/div.
1ms/div.
MP4316 Rev. 1.0
9/22/2021
1ms/div.
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19
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
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.
CH4: IL
1A/div.
CH2: VOUT
1V/div.
CH4: IL
1A/div.
CH2: VOUT
1V/div.
CH1: VSW
5V/div.
CH1: VSW
10V/div.
100ms/div.
100ms/div.
Shutdown through EN
SCP Entry
IOUT = 6A
IOUT = 0A, AAM mode
CH3: VEN
2V/div.
CH2: VOUT
2V/div.
CH3: VPG
5V/div.
CH2: VOUT
1V/div.
CH4: IL
5A/div.
CH1: VSW
10V/div.
CH4: IL
10A/div.
CH1: VSW
10V/div.
100µs/div.
20ms/div.
SCP Entry
SCP Entry
IOUT = 0A, FCCM
IOUT = 6A
CH2: VOUT
2V/div.
CH2: VOUT
2V/div.
CH3: VPG
5V/div.
CH3: VPG
5V/div.
CH4: IL
10A/div.
CH4: IL
10A/div.
CH1: VSW
10V/div.
CH1: VSW
10V/div.
20ms/div.
MP4316 Rev. 1.0
9/22/2021
20ms/div.
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20
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM, 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
10A/div.
CH4: IL
10A/div.
CH1: VSW
10V/div.
CH1: VSW
10V/div.
10ms/div.
10ms/div.
SCP Recovery
SCP Steady State
IOUT = 6A
CH2: VOUT
1V/div.
CH2: VOUT
2V/div.
CH3: VPG
5V/div.
CH4: IL
5A/div.
CH4: IL
10A/div.
CH1: VSW
10V/div.
CH1: VSW
10V/div.
10ms/div.
4ms/div.
Load Transient
SYNCIN Operation
IOUT = 3A to 6A, 1.6A/μs
IOUT = 6A, fSYNC = 350kHz
CH2:
VOUTAC
200mV/div.
CH3:
VSYNCIN
2V/div.
CH2: VOUT
2V/div.
CH1: VSW
10V/div.
CH4: IL
2A/div.
CH4: IOUT
2A/div.
CH1: VSW
10V/div.
100µs/div.
MP4316 Rev. 1.0
9/22/2021
2µs/div.
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM, TA = 25°C, unless otherwise noted.
SYNCIN Operation
SYNCO Operation
IOUT = 6A, fSYNC = 1000kHz
IOUT = 6A, fSYNC = 350kHz
CH3:
VSYNCIN
2V/div.
CH3:
VSYNCO
2V/div.
CH2: VOUT
2V/div.
CH2: VOUT
1V/div.
CH4: IL
2A/div.
CH1: VSW
5V/div.
CH1: VSW
10V/div.
CH4: IL
2A/div.
1µs/div.
2µs/div.
SYNCO Operation
PG Start-Up through VIN
IOUT = 6A, fSYNC = 1000kHz
IOUT = 0A
CH3:
VSYNCO
2V/div.
CH3: VIN
5V/div.
CH2: VOUT
2V/div.
CH2: VOUT
1V/div.
CH4: IL
2A/div.
CH1: VSW
2V/div.
CH4: VPG
2V/div.
CH1: VSW
10V/div.
1µs/div.
1ms/div.
PG Start-Up through VIN
PG Shutdown through VIN
IOUT = 6A
IOUT = 0A
CH3: VIN
5V/div.
CH2: VOUT
2V/div.
CH3: VIN
5V/div.
CH2: VOUT
2V/div.
CH4: VPG
2V/div.
CH4: VPG
2V/div.
CH1: VSW
5V/div.
CH1: 5VSW
5V/div.
1ms/div.
MP4316 Rev. 1.0
9/22/2021
20ms/div.
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22
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
PG Shutdown through VIN
PG Start-Up through EN
IOUT = 6A
IOUT = 0A
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.
PG Start-Up through EN
PG Shutdown through EN
IOUT = 6A
IOUT = 0A
CH3: VEN
2V/div.
CH3: VEN
2V/div.
CH2: VOUT
2V/div.
CH2: VOUT
2V/div.
CH4: VPG
2V/div.
CH4: VPG
2V/div.
CH1: VSW
10V/div.
CH1: VSW
5V/div.
1ms/div.
100ms/div.
PG Shutdown through EN
LDO Operation
IOUT = 6A
VIN = 3.3V, VOUT = 3.3V, IOUT = 0A
CH3: VEN
2V/div.
CH4: IL
50mA/div.
CH2: VOUT
2V/div.
CH1: VSW
1V/div.
CH3: VIN
500mV/div.
CH2: VOUT
500mV/div.
CH4: VPG
2V/div.
CH1: VSW
10V/div.
1ms/div.
MP4316 Rev. 1.0
9/22/2021
4µs/div.
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23
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 3.3V, L = 4.7μH, fSW = 470kHz, AAM mode, TA = 25°C, unless otherwise noted.
LDO Operation
Load Dump
VIN = 3.3V, VOUT = 3.3V, IOUT = 6A
VIN = 12V to 36V, IOUT = 6A
CH3: VIN
10V/div.
CH2: VOUT
2V/div.
CH4: IL
5A/div.
CH1: VSW
50V/div.
CH4: IL
2A/div.
CH2: VOUT
500mV/div.
CH3: VIN
500mV/div.
CH1: VSW
1V/div.
4µs/div.
100ms/div.
Cold Crank
VIN Ramps Up and Down
VIN = 12V to 3.3V to 5V, IOUT = 6A
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.
VIN Ramps Down and Up
VIN Ramps Down and Up
IOUT = 1mA
IOUT = 6A
CH3: VIN
10V/div.
4.5V
CH3: VIN
10V/div.
CH2: VOUT
2V/div.
CH2: VOUT
2V/div.
CH4: IL
2A/div.
CH4: IL
5A/div.
CH1: VSW
20V/div.
CH1: VSW
20V/div.
10s/div.
MP4316 Rev. 1.0
9/22/2021
4.5V
10s/div.
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
FUNCTIONAL BLOCK DIAGRAM
VCC
VCC
VCC
Regulator
EN
Reference
VIN
VCC
VREF
Bootstrap
Regulator
BST
FREQ
ISW
Oscillator
SYNCIN
SYNCO
PG
+
-
VPG_REF
VFB
ISS
SS
Control
Logic
SW
VCC
Error Amplifier
VREF
+
VCOMP
+
VFB 1.15MΩ
2pF
60pF
ILS
PGND
FB
AGND
MODE
Figure 1: Functional Block Diagram
MP4316 Rev. 1.0
9/22/2021
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TIMING SEQUENCE
VIN
0
SW
0
EN
0
EN
Threshold
15µs
VCC
Threshold
VCC
0
106.5% of VREF
95% of VREF
93.5% of VREF
95% of
VREF
105% of VREF
93.5% of VREF
70% of VREF
VOUT
SS
0
IL = ILIMIT
IL
0
PG
35µs
35µs
35µs
35µs
35µs
35µs
0
Start-Up
Normal
Over-Current
Protection
Normal
OverVoltage
Normal
Shutdown
Over-Current
Release
Figure 2: Timing Sequence
MP4316 Rev. 1.0
9/22/2021
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
OPERATION
The MP4316 is a synchronous, step-down
switching converter with integrated internal
power MOSFETs. It can achieve up to 6A of
highly efficient, continuous output current (IOUT)
with current control mode for fast loop response.
The device features a wide 3.3V to 45V input
voltage (VIN) range, configurable switching
frequency (fSW), external soft start (SS), and a
precise current limit. Its low 1.7μA shutdown
current (ISD) makes it well-suited for batterypowered applications.
Pulse-Width Modulation (PWM) Control
At moderate to high output currents, the MP4316
operates with a fixed frequency in peak current
control mode to regulate the output voltage
(VOUT). A pulse-width modulation (PWM) cycle is
initiated by the internal clock. At the rising edge
of the clock, the high-side power MOSFET (HSFET) turns on and remains on until its current
reaches the value set by the internal comparator
voltage (VCOMP). The HS-FET remains on for a
minimum of 100ns.
If the HS-FET is off, the low-side MOSFET (LSFET) turns on and remains on until the next
PWM cycle starts. The LS-FET remains on for a
minimum of 80ns before the next cycle starts.
If the HS-FET current does not reach VCOMP
within one PWM cycle, the HS-FET remains on
to avoid shutting down the device. The HS-FET
turns off after about 10µs, even if it has not
reached VCOMP.
Light-Load Operation
The MP4316 has a mode selection pin (MODE)
that selects the IC’s operation mode at light
loads. Under light-load conditions, the MP4316
can operate in either forced continuous
conduction mode (FCCM) or advanced
asynchronous modulation (AAM) mode.
efficiency under
conditions.
light-load
and
no-load
If AAM mode is enabled, then the MP4316
enters asynchronous operation as the inductor
current (IL) approaches 0A (see Figure 3). If the
load decreases further or if there is no load,
VCOMP drops to its set value, and the device
enters AAM mode.
Inductor
Current
Load
Decreases
Inductor
Current
AAM Mode
FCCM
t
t
Load
t Decreases
t
t
t
Figure 3: AAM and FCCM
In AAM mode, the internal clock resets once
VCOMP reaches its set value. The crossover time
is used as a benchmark for the next clock. If the
load increases and VCOMP exceeds its set value,
then the device operates in discontinuous
conduction mode (DCM) or FCCM, which have a
constant fSW.
Error Amplifier (EA)
The error amplifier (EA) compares the feedback
(FB) voltage (VFB) to the internal reference
voltage (VREF) (typically 0.815V), and outputs a
current that is proportional to the difference
between the voltages. This IOUT charges the
compensation network to set VCOMP, which
controls the power MOSFET’s current.
During normal operation, the minimum VCOMP is
0.9V, and the maximum is 2V. If the IC shuts
down, VCOMP is pulled down to AGND internally.
If MODE is pulled above 1.8V, then the MP4316
operates in FCCM. In FCCM, the device
operates with a fixed frequency from no load to
full loads. Advantages of FCCM include the
controllable fixed frequency and lower VOUT
ripple under light-load conditions.
Internal Regulator (VCC)
The 4.9V internal regulator (VCC) powers most
of the internal circuitry. The regulator uses the
VIN pin as its input and operates across the
entire VIN range. If VIN exceeds 4.9V, then VCC
is in full regulation. If VIN drops below 4.9V, then
VCC’s output degrades.
If MODE is pulled below 0.4V, then the MP4316
operates in AAM mode. AAM mode optimizes
Bootstrap (BST) Charging
The internal bootstrap (BST) regulator charges
MP4316 Rev. 1.0
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
and regulates the BST capacitor (CBST) to about
5V. If the difference between the BST and SW
pin voltages (VBST - VSW) drops below 5V, then a
P-channel MOSFET pass transistor connected
between the VCC and BST pins turns on to
charge CBST. The external circuit should provide
enough voltage headroom to facilitate the
charging. If the HS-FET turns on, VBST exceeds
the VCC voltage (VCC), and CBST cannot be
charged.
During high duty cycles, there is less time to
charge CBST. This means that CBST may not be
charged sufficiently. If the external circuit has an
insufficient voltage or not enough time to charge
CBST, an additional external circuit is required to
ensure that VBST remains in its normal operation
range.
Low-Dropout (LDO) Mode and Refreshing the
Bootstrap Capacitor (CBST)
To improve dropout, the MP4316 is designed to
operate at almost 100% duty cycle when
VBST - VSW exceeds 2.5V. If VBST - VSW drops
below 2.5V, then under-voltage lockout (UVLO)
turns off the HS-FET. This allows the LS-FET to
conduct and refresh the charge on CBST. In DCM
or pulse-skip mode (PSM), the LS-FET turns on
to refresh VBST.
Since the supply current sourced from CBST is
low, the HS-FET can remain on for more than the
required switching cycles to refresh CBST. As a
result, the converter has a high effective duty
cycle.
The converter’s effective duty cycle during
dropout is determined by the voltage drops
across the HS-FET, the LS-FET, the inductor
resistance, the low-side diode, and the PCB
resistance.
Enable (EN) Control
Enable (EN) is a digital control pin that turns the
converter on and off.
Enabling the IC via an External High or Low
Logic Signal
Pull EN below 0.85V to turn the converter off; pull
EN above 1V to turn it on.
Configurable VIN Under-Voltage Lockout
(UVLO) Protection
If VIN exceeds the UVLO rising threshold, then
the IC can be enabled and disabled via the EN
MP4316 Rev. 0.81
9/22/2021
pin. With an internal current source, a
configurable VIN UVLO threshold and hysteresis
can be generated. The EN voltage (VEN) can be
set via resistor dividers (REN1 + REN2) (see Figure
4).
VIN
REN1
EN
REN2
Figure 4: Enable Divider Circuit
Configurable Switching Frequency (fSW) and
Frequency Foldback
The MP4316’s fSW can be configured via an
external resistor (RFREQ) connected from the
FREQ pin to AGND, or by a logic-level SYNC
signal.
See the fSW vs. RFREQ curves on page 15 to select
RFREQ and set fSW. If fSW is set high, it may fold
back at high input voltages to avoid triggering a
minimum on time (tON_MIN) that would force the
output out of regulation.
Set the fSW between 350kHz and 1000kHz for car
battery applications. Table 1 lists the
recommended RFREQ values for common
switching frequencies. High frequencies can be
used in applications that do not require a critical
fSW limit or that have 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
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
Frequency Spread Spectrum (FSS)
The MP4316 employs a 12kHz modulation
frequency and a fixed 128-step triangular profile
to spread the internal fSW across a 20% (±10%)
window (see Figure 5). The steps are fixed and
independent of the set fSW. This optimizes the
frequency spread spectrum (FSS) performance.
128 Fixed Steps
fSPAN = 20% x fSW
fMOD = 12k
Figure 5: Frequency Spread Spectrum
Side bands are created by modulating fSW via the
triangle modulation waveform. This reduces the
fundamental fSW emission power and harmonics,
which reduces noise caused by peak
electromagnetic interference (EMI).
Soft Start (SS)
The MP4316 employs SS to prevent VOUT from
overshooting during start-up.
Once a SS is initiated, an internal current source
charges the external soft-start capacitor (CSS). If
the soft-start voltage (VSS) drops below VREF,
then VSS overrides VREF and the EA uses VSS as
the reference. If VSS exceeds VREF, then the EA
uses VREF as the reference.
The soft-start capacitance
calculated with Equation (1):
CSS (nF)
(CSS)
can
be
t SS (ms) ISS (μA)
13.5 t SS (ms) (1)
VREF (V)
The SS pin can be used for tracking and
sequencing.
Pre-Biased Start-Up
If VFB exceeds VSS - 150mV during start-up, then
the output has a pre-biased voltage. With a prebiased voltage, the HS-FET and LS-FET do not
turn on until VSS exceeds VFB.
Thermal Shutdown
Thermal shutdown prevents the IC from
operating at exceedingly high temperatures. If
the die temperature exceeds the thermal
shutdown threshold (about 170°C), then the
device shuts down. Once the temperature drops
MP4316 Rev. 1.0
9/22/2021
below about 150°C, the device initiates a SS and
resumes normal operation.
Current Comparator and Current Limit
The MOSFET currents are sensed via a currentsense MOSFET. This current is fed to the highspeed current comparator for current mode
control. The current comparator uses this
sensed current as one of its inputs.
If the HS-FET turns on, the comparator is
blanked until the end of the turn-on period to
mitigate noise. The comparator compares the
MOSFET current to the set VCOMP value. If the
sensed current exceeds VCOMP, the comparator
outputs low to turn off the HS-FET. The internal
MOSFET maximum current is limited internally
cycle by cycle.
Output Over-Voltage Protection (OVP) with
Hiccup Mode
If an output short to ground occurs, VOUT may
drop below 70% of its nominal output voltage. If
this occurs, the MP4316 shuts down to
discharge CSS. Once CSS is discharged, the
device initiates a SS to resume normal operation.
This process is repeated until the fault condition
is removed.
Start-Up and Shutdown
If both VIN and VEN exceed their respective
thresholds, the MP4316 starts up. The reference
block starts up first to generate a stable VREF and
currents. Then the internal regulator starts up to
provide a stable supply for the remaining
circuitries.
While the internal supply rail is up, an internal
timer turns the HS-FET and LS-FET off for about
50µs to blank any start-up glitches. Once the
soft-start block is enabled, the device outputs
low to ensure that the remaining circuitry is ready
before slowly ramping up.
Three events can shut down the IC: VEN going
low, VIN going low, and thermal shutdown. Once
shutdown is initiated, the signaling path is
blocked to avoid triggering any faults. Then
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.
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
Power Good (PG) Output
The power good (PG) pin is an open-drain output.
If using the PG pin, connect it to a power source
via a pull-up resistor. If VOUT is between 95% and
105% of the nominal voltage, PG is pulled high.
If VOUT exceeds 106.5% or drops below 93.5% of
the nominal voltage, PG is pulled low.
SYNCIN and SYNCO
fSW can be synchronized to the rising edge of the
SYNCIN clock. It is recommended that the
SYNCIN frequency (fSYNCIN) be between 350kHz
and 1000kHz. SYNCIN’s off time (tOFF) should be
shorter than the internal oscillator period;
otherwise, the internal clock may turn on the HSFET before the rising edge of SYNCIN.
there is always parasitic capacitance on the pad.
If the pulse width is too short, then a clear rising
and falling edge may not be achieved due to the
parasitic capacitance. It is recommended to set
the pulse width above 100ns.
If using SYNCIN in AAM mode, pull SYNCIN
below 0.4V or float SYNCIN before start-up.
Then add the external SYNCIN clock. Connect a
10kΩ to 51kΩ resistor between SYNCIN and
AGND to avoid floating SYNCIN.
The SYNCO pin provides a default 180° phaseshifted clock for the internal oscillator. If there is
no external SYNCIN clock, SYNCO can provide
a 180° phase-shifted clock that is compared to
the internal clock.
There is no SYNCIN pulse width limit; however,
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
APPLICATION INFORMATION
Setting the Output Voltage
The external resistor divider connected to the FB
pin sets VOUT (see Figure 6).
The
worst-case
condition
occurs
at
VIN = 2 x VOUT, which can be calculated with
Equation (4):
ICIN
MP4316
RFB1
FB
VOUT
CIN can be electrolytic, tantalum, or ceramic. If
using electrolytic or tantalum capacitors, place a
small, high-quality ceramic capacitor (0.1μF) as
close to the device as possible.
Figure 6: Feedback Network
The feedback resistor (RFB2) can be calculated
with Equation (2):
RFB1
VOUT
1
0.815V
(2)
Table 2 lists the recommended feedback resistor
values for common output voltages.
Table 2: Recommended Resistor Values for
Common Output Voltages
VOUT (V)
3.3
5
RFB1 (kΩ)
100 (1%)
100 (1%)
For most applications, a 4.7µF to 10µF capacitor
is sufficient. It is strongly recommended to use
another low-value capacitor (0.1µF) with a small
package size (0603) to absorb high-frequency
noise. Place the smaller capacitor as close to the
VIN pin and PGND as possible.
Since the input capacitor (CIN) absorbs the input
switching current, it requires an adequate ripple
current rating. The RMS current in CIN (ICIN) can
be estimated with Equation (3):
MP4316 Rev. 1.0
9/22/2021
VOUT
V
(1 OUT )
VIN
VIN
The input capacitance determines the input
voltage ripple of the converter. If using ceramic
capacitors, ensure that CIN meets the system
design’s input voltage ripple (∆VIN) requirement.
CIN should 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
RFB2 (kΩ)
32.4 (1%)
19.6 (1%)
Selecting the Input Capacitor (CIN)
The step-down converter has a discontinuous
input current, and requires a capacitor to supply
AC current to the converter while maintaining the
DC VIN. 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
(4)
For simplification, choose a CIN with an RMS
current rating greater than half of the maximum
load current (ILOAD_MAX).
RFB2
RFB2
ILOAD
2
(3)
ILOAD
V
V
OUT (1 OUT )
fSW CIN VIN
VIN
(5)
Selecting the Output Capacitor (COUT)
The output capacitor (COUT) maintains the DC
VOUT. Use ceramic, tantalum, or low-ESR
electrolytic capacitors. Ceramic capacitors with
low ESR are recommended for their small size
and low output voltage ripple. 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 of COUT.
For ceramic capacitors, the capacitance
dominates the impedance at fSW and causes the
majority of ∆VOUT. For simplification, ∆VOUT can
be estimated with Equation (7):
VOUT
VOUT
V
(1 OUT )
8 fSW L COUT
VIN
2
(7)
For tantalum or electrolytic capacitors, the ESR
dominates the impedance at fSW.
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
For simplification, ∆VOUT can be calculated with
Equation (8):
VOUT
VOUT
V
(1 OUT ) RESR
fSW L
VIN
(8)
The characteristics of COUT also affect the
stability of the regulation system. The MP4316
can be optimized for a wide range of
capacitances and ESR values.
Selecting the Inductor
For most applications, a 1µH to 10µH inductor
with a DC current rating of at least 25% greater
than ILOAD_MAX is recommended. For higher
efficiency, choose an inductor with a lower DC
resistance. A larger-value inductor offers less
ripple current and a lower ∆VOUT; however, a
larger-value inductor 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
(∆IL) to be approximately 30% of ILOAD_MAX. The
inductance can be estimated with Equation (9):
L
VOUT
V
(1 OUT )
fSW IL
VIN
(9)
VOUT
V
(1 OUT )
2 fSW L
VIN
(10)
Setting VIN Under-Voltage Lockout (UVLO)
The MP4316 has an internal, fixed UVLO
threshold. The rising threshold is 3V, and the
falling threshold is about 2.7V. For applications
that require a higher UVLO, place an external
resistor divider between the VIN and EN pins to
raise the UVLO threshold (see Figure 7).
VIN
RUP
) VEN_RISING
RDOWN
VIN
R UP
EN
RDOWN
(11)
Where VEN_RISING is 1V.
The UVLO falling threshold (VIN_UVLO_FALLING) can
be calculated with Equation (12):
VIN_UVLO_FALLING (1
RUP
) VEN_FALLING
RDOWN
(12)
Where VEN_FALLING is 0.85V.
Selecting the External Bootstrap (BST) Diode
and Resistor
An external BST diode can enhance the BST
regulator’s efficiency during high duty cycles. A
2.5V to 5V power supply can be used to power
the external BST diode. It is recommended to
use VCC or VOUT as the power supply (see Figure
8).
VCC
RBST
External BST diode
IN4148
BST
Vcc / VOUT
CBST
Choose ∆IL to be about 30% of ILOAD_MAX. The
maximum inductor peak current (ILP) can be
calculated with Equation (10):
ILP ILOAD
VIN_UVLO_RISING (1
L
VOUT
SW
COUT
Figure 8: Optional External BST Diode for
Enhanced Efficiency
It is recommended to use an IN4148 external
BST diode. 1μF. A resistor (RBST) in series with
CBST can reduce VSW rising slew rate and voltage
spikes. This improves EMI performance and
reduces voltage stress at a high VIN. A higher
resistance is better for SW spike reduction, but
can compromise efficiency. To make a tradeoff
between EMI and efficiency, it is recommended
to keep RBST below 20Ω. The recommended CBST
value is 0.1µF to 1μF.
Selecting the VCC Capacitor (CVCC)
The VCC capacitor (CVCC) should have a
capacitance of 10 times the boost capacitor’s
capacitance. CVCC should not exceed 68µF.
Figure 7: Setting the UVLO Threshold via the EN
Resistor Divider
The UVLO rising threshold (VIN_UVLO_RISING) can
be calculated with Equation (11):
MP4316 Rev. 1.0
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
PCB Layout Guidelines (10)
Efficient PCB layout is critical for stable
operation. It is recommended to use a 4-layer
layout to improve thermal performance. For the
best results, refer to Figure 9 and follow the
guidelines below:
1.
Place the symmetric input capacitors as
close to VIN and PGND as possible.
2.
Connect a large copper plane directly to
PGND.
3.
If the bottom PCB layer is the ground plane,
place multiple vias near PGND.
4.
Use short, direct, and wide traces for the
high-current paths connected to VIN and
PGND.
5.
Place CIN as close to the VIN and PGND
pins as possible to minimize high-frequency
noise. It is recommended that CIN be a
ceramic bypass capacitor in a small 0603
package.
6.
Keep the connection between CIN and VIN
as short and wide as possible.
7.
Place CVCC as close to VCC and AGND as
possible.
8.
Route the SW and BST traces away from
sensitive analog areas, such as FB.
9.
Keep the FB trace as short as wide as
possible by placing the FB resistors close to
the IC.
Top Layer
Mid-Layer 1
10. Use multiple vias to connect the power
planes and the internal layers.
Mid-Layer 2
Note:
10) The recommended PCB layout is based on Figure 10 on page
34.
Bottom Layer
Figure 9: Recommended PCB Layout
MP4316 Rev. 1.0
9/22/2021
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL APPLICATION CIRCUITS
6
VIN = 3.3V to 45V
C1A C1B
PGND
EN
3, 12
C1C
10µF 10µF 0.1µF
C1D
0.1µF
VIN
SW
R1
100k
0.85V 1V
9 EN
20
FREQ
R2
62k
VOUT =
3.3V/6A
L1
7, 8
C2A
47µF
47pF 10V
1210
ILIMIT 4.7µH
(Typically R4
13A) 100k
18
Typically
0.815V
C5
C2B
47µF
10V
1210
GND
R5
32.4k
MP4316
SS
PG 14
C3
22nF
2
PG
R6
100k
SYNCIN
R3
51k
SYNCO
FB
U1
19
SYNCIN
C4
0.1µF
BST
VCC 16
NC 15
13 SYNCO
MODE 1
AGND PGND
4, 5,
17
10, 11
C6
4.7µF FCCM
3
2 JP1
1
AAM
Mode
Figure 10: Typical Application Circuit (VOUT = 3.3V, fSW = 470kHz)
MP4316 Rev. 1.0
9/22/2021
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MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
TYPICAL APPLICATION CIRCUITS (continued)
4.7µH VIN
BLM41PG600SN1L
VEMI
L1
CIN1 CIN2
1nF
CIN3
1µF
10nF
CIN4
1µF
L2
CIN5
47µF
PGND
VIN = 3.3V to 45V
C1A
3, 12
C1B C1C
L3
4.7µH
7, 8
SW
ILIMIT
(Typically R4
13A) 100k
VIN
C1D
PGND 10µF 10µF 0.1µF 0.1µF
R1
100k
EN 0.85V 1V
C4
0.1µF
6
BST
9
EN
20
FREQ
R2
75k
FB
U1
SS
PG
SYNCO
C2B
47µF
10V
1210
COUT1 COUT2 COUT3 COUT4
10nF 1nF
10nF 1nF
R5
19.6k
PG
14
R6
100k
2
R3
51k
47pF
C2A
47µF
10V
1210
GND
Typically
0.815V
C3
22nF
SYNCIN
C5
18
MP4316
19
VOUT =
5V/6A
13
SYNCIN
VCC
SYNCO
NC
MODE
AGND PGND
17
4, 5,
10, 11
16
15
1
C6
4.7µF
3
2
JP1
1
Figure 11: Typical Application Circuit (VOUT = 5V, fSW = 410kHz, with EMI Filters)
MP4316 Rev. 1.0
9/22/2021
MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
35
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
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
MP4316 Rev. 1.0
9/22/2021
MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
36
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
CARRIER INFORMATION
Pin1
1
1
ABCD
1
1
ABCD
ABCD
ABCD
Feed Direction
Part Number
Package Description
MP4316GRE-Z
QFN-20 (4mmx4mm)
Quantity/
Reel
5000
Quantity/
Tube (13)
N/A
Reel
Diameter
13in
Carrier
Tape Width
12mm
Carrier
Tape Pitch
8mm
Note:
11) N/A means “not applicable.” Contact MPS for 500 pieces of tape and reel prototype quantities. The order code for a 500-piece partial reel is
“-P”. The tape and reel dimensions are the same as the full reel.
MP4316 Rev. 1.0
9/22/2021
MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
37
MP4316 – 45V, 6A, SYNC BUCK CONVERTER W/ FREQUENCY SPREAD SPECTRUM
REVISION HISTORY
Revision #
Revision
Date
Description
1.0
9/22/2021
Initial Release
Pages Updated
-
Notice: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third-party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
MP4316 Rev. 1.0
9/22/2021
MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2021 MPS. All Rights Reserved.
38
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