MPM3683-7
2.7V-16V, 8A, Step-Down Power Module
in QFN (7x7x4mm) Package
DESCRIPTION
FEATURES
The MPM3683-7 is an easy-to-use, fully
integrated, step-down, DC/DC power module
with 8A of continuous current and 10A of peak
current. The MPM3683-7 integrates a DC/DC
converter, power inductor, and some basic
passive components. The MPM3683-7 can
deliver output current over a wide input voltage
supply range with excellent load and line
regulation.
The MPM3683-7 uses constant-on-time (COT)
control to provide fast transient response and
ease loop stabilization.
The operating frequency can be set to 600kHz,
800kHz, or 1000kHz easily with the MODE
configuration,
allowing
the
MPM3683-7
frequency to remain constant regardless of the
input and output voltages.
The MPM3683-7 has an internal soft-start (SS)
timer of about 1.6ms. This can be increased
with an extra SS capacitor placed between
TRK/REF and AGND. An open-drain power
good signal indicates that the output voltage is
within the nominal voltage range.
The MPM3683-7 has fully integrated, nonlatched protection features including overcurrent
protection
(OCP),
over-voltage
protection (OVP), under-voltage protection
(UVP), and over-temperature protection (OTP).
The MPM3683-7 is available in a space-saving
QFN-28 (7mmx7mmx4mm) package.
Wide Input Voltage Range from 2.7V
o 2.7V to 16V with External 3.3V Bias
o 4V to 16V with Internal Bias or External
3.3V Bias
Differential Output Voltage Remote Sense
Low RDS(ON) Integrated Power MOSFETs
Integrated Inductor
Proprietary Switching Loss Reduction
Technique
Adaptive Constant-on-Time (COT) for
Ultrafast Transient Response
Stable with Zero-ESR Output Capacitor
0.5% Reference Voltage over 0°C to +70°C
Junction Temperature Range
1% Reference Voltage from -40°C to
+125°C Junction Temperature Range
Selectable Pulse Skip or Forced Continuous
Conduction Mode (CCM) Operation
Excellent Load Regulation
Output Voltage Tracking
Output Voltage Discharge
PG Active Clamped Low Level during
Power Failure
Programmable Soft-Start Time from 1.6ms
Pre-Bias Start-Up
Selectable Switching Frequency from
600kHz, 800kHz, and 1000kHz
Non-Latch OCP, UVP, UVLO, Thermal
Shutdown, and OVP
Output Adjustable from 0.6V to up to 5.5V
Max
Available in a QFN-28 (7mmx7mmx4mm)
Package
APPLICATIONS
Telecom and Networking Systems
Base Stations
Industrial Systems
Servers & Storage
FPGA & ASIC Cards
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.
MPM3683-7 Rev. 1.01
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7/27/2020
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1
MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
TYPICAL APPLICATION
VOUT
VIN
NC
VIN
VOUT
CIN1
MPM3683-7
EN
EN
PG
SW
RFB1
COUT
Vo Sense+
RFB2
RCS
Efficiency
VIN = 5V/12V/16V, VOUT = 3.3V, IOUT = 0-10A
EFFICIENCY (%)
100
90
80
70
Vin=12V
60
Vin=16V
VIN=5V
50
0
2
4
6
8
10
LOAD CURRENT (A)
MPM3683-7 Rev. 1.01
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2
MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
ORDERING INFORMATION
Part Number
MPM3683GQN-7
Package
QFN-28 (7mmx7mmx4mm)
Top Marking
See Below
MSL
3
TOP MARKING
MPS: MPS prefix
YY: Year code
WW: Week code
MP3683-7: Product code of MPM3683GQN-7
LLLLLLLLL: Lot number
M: Module
PACKAGE REFERENCE
TOP VIEW
QFN-28 (7mmx7mmx4mm)
MPM3683-7 Rev. 1.01
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
PIN FUNCTIONS
Pin #
1, 2, 6, 7
3
4
5, 8, 9, 27
10, 11, 12
13
14 - 16, 19,
20, 28
17
18, 21
22
23
24
25
26
Name
VOUT
Description
Module voltage output node.
Enable. EN is a digital input that turns the regulator on or off. Drive EN high to turn on
EN
the regulator. Drive EN low to turn off the regulator. Connect EN to VIN through a
pull-up resistor or a resistive voltage divider for automatic start-up. Do not float EN.
Power good output. PG is an open-drain signal. A pull-up resistor (connected to a
DC voltage) indicates high if the output voltage is within regulation. There is a delay
PG
of about 1ms from when Vo Sense+ becomes greater than or equal to 92.5% and
when PG pulls high.
Input voltage. VIN supplies power for the internal MOSFET and regulator. Input
VIN
capacitors are needed at VIN to decouple the input rail. Use wide PCB traces to
make the connection.
System ground. PGND is the reference ground of the regulated output voltage and
PGND
requires careful consideration during the PCB layout. Use wide PCB traces to make
the connection.
Internal 3.3V LDO output. The driver and control circuits are powered from the VCC
VCC
voltage. The module integrates an LDO output capacitor and does not require an
additional external capacitor.
Switch output. A large copper plane is recommended on SW to improve the thermal
SW
performance.
Bootstrap. A bootstrap capacitor is integrated internally and does not require an
BST
external connection.
AGND
Analog ground. Select AGND as the control circuit reference point.
CS
Current limit. Connect a resistor to ground to set the current limit trip point.
Operation mode selection. Program MODE to select CCM, pulse-skip mode, and
MODE
the operating switching frequency. See Table 1 on page 16 for additional details.
External tracking voltage input. The output voltage tracks the TRK/REF input
signal. Decouple TRK/REF with a ceramic capacitor as close to TRK/REF as
TRK/REF possible. X7R or X5R grade dielectric ceramic capacitors are recommended for their
stable temperature characteristics. The capacitance of this capacitor determines the
soft-start time. See Equation 2 on page 16 for additional details.
Vo Sense-. Connect Vo Sense- to the negative side of the voltage sense point
Vo Sensedirectly. Short Vo Sense- to GND if the remote sense is not used.
Vo Sense+ Vo Sense+. Place a resistor from Vo Sense+ to GND to set the output voltage.
MPM3683-7 Rev. 1.01
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (5)
Supply voltage (VIN to GND) ........... -0.3V to 18V
VSW(DC) to GND ...................... -0.3V to VIN + 0.3V
VSW (25ns) to GND ................................. -5V to 25V
VCC ................................................................ 4.5V
All other pins ................................ -0.3V to +4.3V
Continuous power dissipation (TA = +25°C) (2)
QFN-28 (7mmx7mmx4mm) ......................... 2.7W
Junction temperature ................................ 170°C
Lead temperature...................................... 260°C
Storage temperature .................-55°C to +170°C
QFN-28 (7mmx7mmx4mm) ..... 32 ..... 11 ... °C/W
Recommended Operating Conditions (3)
Supply voltage (VIN) ............................ 4V to 16V
VIN(DC) - VSW(DC) ...................... -0.3V to VIN + 0.3V
VSW(DC) ................................... -0.3V to VIN + 0.3V
Output voltage (VOUT) ...................... 0.6V to 5.5V
External VCC bias (VCC_EXT) ......... 3.12V to 3.6V
EN voltage(4) (VEN)........................................ 3.6V
Operating junction temp. (TJ). ...-40°C to +125°C
θJA
θJC
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 produces an excessive die temperature.
3) The device is not guaranteed to function outside of its
operating conditions.
4) EN pin has zener diode embedded for clamping the voltage at
3.6V. Please refer to the Operation Section for current
limitation.
5) Measured on EVM3683-7-QN-01A.
MPM3683-7 Rev. 1.01
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
ELECTRICAL CHARACTERISTICS
VIN = 12V, VOUT = 1.2V, TJ = -40°C to 125°C
otherwise noted.
Parameters
Supply Current
Supply current (shutdown)
Supply current (quiescent)
MOSFET
Switch leakage
Current Limit
Current limit threshold
Low-side negative current
limit
Negative current limit timeout (6)
Switching Frequency
Symbol
IIN
IIN
SWLKG_HS
SWLKG_LS
(7)
, typical value is tested at TJ = 25°C, unless
Condition
Min
VEN = 0V
VEN = 2V, VVo Sense+ = 0.62V
VEN = 0V, VSW = 0V
VEN = 0V, VSW = 12V
VLIM
1.15
Typ
Max
Units
10
650
20
850
μA
μA
0
0
10
30
μA
1.2
1.25
V
ILIM_NEG
-9
A
tNCL_Timer
200
ns
MODE = GND, IOUT = 0A,
VOUT = 1V, TJ = +25°C
MODE = 34.8kΩ, IOUT = 0A,
Switching frequency (7)
fSW
VOUT = 1V, TJ = +25°C
MODE = 80.6kΩ, IOUT = 0A,
VOUT = 1V, TJ = +25°C
Minimum on time (7)
TON_MIN
VVO SENSE+ = 500mV
Minimum off time (7)
TOFF_MIN
VVO SENSE+ = 500mV
Over-Voltage and Under-Voltage Protection (OVP, UVP)
OVP threshold
VOVP
UVP threshold
VUVP
Feedback Voltage and Soft Start (SS)
TJ = -40°C to +125°C
Feedback voltage
VREF
TJ = 0°C to +70°C
TRK/REF sourcing current
ITRACK_Source VTRK/REF = 0V
TRK/REF sinking current
ITRACK_Sink
VTRK/REF = 1V
Soft-start time
tSS
CTRACK = 100nF, TJ = 25°C
Error Amplifier
Feedback current
I Vo Sense+
VVo Sense+ = REF
Enable and Under-Voltage Lockout (UVLO)
Enable input rising
VIHEN
threshold
Enable hysteresis
VEN-HYS
Enable input current
IEN
VEN = 2V
Soft shutdown discharge
RON_DISCH
MOSFET
VIN UVLO
VIN under-voltage lockout
VINVth_Rise
threshold rising
VCC = 3.3V
VIN under-voltage lockout
VINVth_Fall
threshold falling
480
600
720
kHZ
680
800
920
kHZ
850
1000
1150
kHZ
50
180
ns
ns
113%
77%
116%
80%
119%
83%
VREF
VREF
594
597
600
600
42
12
1.6
606
603
mV
mV
μA
μA
ms
50
100
nA
1.22
1.27
V
1.17
200
0
mV
μA
80
150
Ω
2.1
2.4
2.7
V
1.55
1.85
2.15
V
MPM3683-7 Rev. 1.01
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, VOUT = 1.2V, TJ = -40°C to 125°C
otherwise noted.
Parameters
VCC Regulator
VCC under-voltage lockout
threshold rising
VCC under-voltage lockout
threshold falling
VCC regulator
VCC load regulation
Power Good (PG)
Power good high threshold
Power good low threshold
Power good low to high
delay
Power good sink current
capability
Power good leakage
current
Symbol
(7)
, typical value is tested at TJ = 25°C, unless
Condition
Min
Typ
Max
Units
VCCVth_Rise
2.65
2.8
2.95
V
VCCvth_Fall
2.35
2.5
2.65
V
VCC
2.88
3.00
0.5
3.12
V
%
Icc = 25 mA
PGVth_Hi_Rise
Vo Sense+ from low to high
89.5%
92.5%
95.5%
VREF
PGVth_Lo_Rise
PGVth_Lo_Fall
Vo Sense+ from low to high
Vo Sense+ from high to low
113%
77%
116%
80%
119%
83%
VREF
VREF
PGTd
TJ = 25°C
VPG
IPG = 10mA
0.4
V
IPG_LEAK
VPG = 3.3V
3
µA
650
850
mV
800
1000
mV
VOL_100
Power good low-level
output voltage
VOL_10
VIN = 0V, pull PG up to 3.3V
through a 100kΩ resistor @
25°C
VIN = 0V, pull PG up to 3.3V
through a 10kΩ resistor @
25°C
0.9
ms
Thermal Protection
Thermal shutdown (7)
Thermal shutdown
hysteresis (7)
TSD
160
°C
30
°C
NOTES:
6) Not tested in production, guaranteed by over-temperature correlation.
7) Guarantee by engineering sample characterization
MPM3683-7 Rev. 1.01
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7/27/2020
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
TYPICAL CHARACTERISTICS
Efficiency
Efficiency
VIN = 4V/12V/16V, VOUT = 1V, IOUT = 0-10A
VIN = 4V/12V/16V, VOUT = 1.2V, IOUT = 0-10A
100
100
90
90
EFFICIENCY (%)
EFFICIENCY (%)
VIN = 12V, VOUT = 1.2V, CCM = 1000kHz, TA = 25°C, unless otherwise noted.
80
70
Vin=4V
Vin=12V
Vin=16V
60
50
0
2
4
6
8
80
70
Vin=4V
Vin=12V
Vin=16V
60
50
10
0
2
6
8
10
LOAD CURRENT (A)
Efficiency
VIN = 4V/12V/16V, VOUT = 1.8V, IOUT = 0-10A
VIN = 5V/12V/16V, VOUT = 3.3V, IOUT = 0-10A
100
100
90
90
80
70
Vin=4V
Vin=12V
Vin=16V
60
0
2
4
6
8
80
70
Vin=12V
60
Vin=16V
VIN=5V
50
50
0
10
2
4
6
8
Efficiency
Line Regulation
VIN = 6.5V/12V/16V, VOUT = 5V, IOUT = 0-10A
VOUT = 1V/1.2V/1.8V/3.3V/5V, IOUT = 10A
100
LINE REGULATION (%)
90
80
70
Vin=6.5V
Vin=12V
Vin=16V
60
50
0
2
4
6
LOAD CURRENT (A)
10
LOAD CURRENT (A)
LOAD CURRENT (A)
EFFICIENCY (%)
4
Efficiency
EFFICIENCY (%)
EFFICIENCY (%)
LOAD CURRENT (A)
8
10
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
Vo=1.2V
Vo=1.8V
Vo=3.3V
Vo=5V
Vo=1V
4
6
8
10
12
14
INPUT VOLTAGE (V)
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8
MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
TYPICAL CHARACTERISTICS (continued)
Load Regulation
Thermal Derating
VIN = 12V, VOUT = 1V/1.2V/1.8V/3.3V/5V,
IOUT = 0-10A
VIN = 12V
10
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
8
MAX LOAD (A)
LOAD REGULATION (%)
VIN = 12V, VOUT = 1.2V, CCM=1000kHz, TA = 25°C, unless otherwise noted.
Vo=1.2V
Vo=1V
Vo=1.8V
Vo=3.3V
Vo=5V
0
5
LOAD CURRENT (A)
10
6
Vo=0.85V
Vo=1.2V
Vo=1.8V
Vo=3.3V
Vo=5V
4
2
25
45
65
85
105
AMBIENT TEMPERATURE (°C)
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 1.2V, CCM=1000kHz, TA = 25˚C, unless otherwise noted.
Vo Ripple
Vo Ripple
IOUT = 0A
IOUT = 10A
CH1:
VOUT/AC
5mV/div.
CH1:
VOUT/AC
5mV/div.
CH4: IOUT
5A/div.
CH4: IOUT
5A/div.
1μs/div.
1μs/div.
VIN Start-Up through Input Voltage
VIN Start-Up through Input Voltage
IOUT = 0A
IOUT = 10A
CH1: VOUT
1V/div.
CH1: VOUT
1V/div.
CH2: VIN
5V/div.
CH2: VIN
5V/div.
CH3: VSW
5V/div.
CH3: VSW
5V/div.
CH4: IOUT
10A/div.
CH4: IOUT
10A/div.
2ms/div.
2ms/div.
VIN Shutdown through Input Voltage
VIN Shutdown through Input
Voltage
IOUT = 10A
IOUT = 0A
CH1: VOUT
1V/div.
CH1: VOUT
1V/div.
CH2: VIN
5V/div.
CH2: VIN
5V/div.
CH3: VSW
5V/div.
CH3: VSW
5V/div.
CH4: IOUT
CH4: IOUT
10A/div.
10A/div.
20ms/div.
1ms/div.
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 1.2V, CCM=1000kHz, TA = 25°C, unless otherwise noted.
EN On
EN On
IOUT = 0A
IOUT = 10A
CH1: VOUT
1V/div.
R1: VPG
2V/div.
CH2: VEN
5V/div.
CH1: VOUT
1V/div.
R1: VPG
2V/div.
CH2: VEN
5V/div.
CH3: VSW
10V/div.
CH3: VSW
10V/div.
CH4: IOUT
CH4: IOUT
10A/div.
10A/div.
2ms/div.
2ms/div.
EN Off
EN Off
IOUT = 0A
IOUT = 10A
CH1: VOUT
1V/div.
R1: VPG
2V/div.
CH1: VOUT
1V/div.
R1: VPG
2V/div.
CH2: VEN
5V/div.
CH2: VEN
5V/div.
CH3: VSW
10V/div.
CH3: VSW
10V/div.
CH4: IOUT
CH4: IOUT
10A/div.
10A/div.
2ms/div.
400µs/div.
SCP Recovery
SCP Recovery
IOUT = 0A
IOUT = 10A
CH1: VOUT
1V/div.
CH1: VOUT
1V/div.
CH2: VPG
2V/div.
CH2: VPG
2V/div.
CH3: VSW
10V/div.
CH3: VSW
10V/div.
CH4: IOUT
10A/div.
CH4: IOUT
10A/div.
10ms/div.
10ms/div.
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 12V, VOUT = 1.2V, CCM=1000kHz, TA = 25°C, unless otherwise noted.
SCP Entry
SCP Entry
IOUT = 0A
IOUT = 10A
CH1: VOUT
1V/div.
CH1: VOUT
1V/div.
CH2: VPG
2V/div.
CH2: VPG
2V/div.
CH3: VSW
10V/div.
CH3: VSW
10V/div.
CH4: IOUT
10A/div.
CH4: IOUT
10A/div.
10ms/div.
10ms/div.
SCP Steady State
Load Transient
IOUT = 5-10A,1A/μs
CH1: VOUT
1V/div.
CH1:
VOUT/AC
20mV/div.
CH2: VPG
2V/div.
CH3: VSW
10V/div.
CH4: IOUT
5A/div.
CH4: IOUT
10A/div.
10ms/div.
100μs/div.
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
TYPICAL CHARACTERISTICS (continued)
VIN = 12V, VOUT = 1.2V, CCM=1000kHz, TA = 25°C, unless otherwise noted.
Conducted Emission, EN55022 Class B
Vout=1.2V,Io=7A,EMI tested with the input filter
installed as shown in the EMI test circuit
Radiated Emission, EN55022 Class B
Vout=1.2V,Io=7A, EMI tested with the input filter
installed as shown in the EMI test circuit
100
60
90
50
80
CLASS B_Main Voltage_QP
60
CLASS B_Main Voltage_AV
50
40
30
40
Level in dB礦/m
Level in dB礦
70
Class_B Radiated Emission_QP_10m
30
20
20
10
10
0
150k
300 400 500
800 1M
2M
3M 4M 5M 6
8 10M
Frequency in Hz
CLASS B_Main Voltage_QP
Preview Result 1-PK+
Data Reduction Result 1 [1]-PK+
CLASS B_Main Voltage_AV
Preview Result 2-AVG
Data Reduction Result 2 [1]-AVG
20M
30M
0
30M
50
60
80 100M
200
300
400
500
800
1G
Frequency in Hz
Class_B Radiated Emission_QP_10m
Data Reduction Result 1 [1]-PK+
Preview Result 1V-PK+
EMI Test Circuit:
MPM3683-7 Rev. 1.01
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
BLOCK DIAGRAM
VIN
MODE
0.1µF
243K
MODE
Select
3 V LDO
VCC
BST
REG
1µF
Reference
EN
Off
Timer
System
Monitor
xS
0.1µF
xR
Vo Sense+
Q
HSG
LSG
TRK/REF
Error
Amplifier
1µF
HS
Driver
OV_TH UV_TH
Vo Sense-
BST
PWM
Comparator
SW
0.68µH
Logic
Control
VOUT
On
Timer
HSG
LSG
LS
Driver
Ramp
ZCD
Valley
Current
xLIM Limit &
ZCD
PGOOD
Comparator
OV_TH
PGND
OV Detect
Comparator
PG
CS
UV_TH
FAULT
10K
UV Detect
Comparator
Figure 1: Functional Block Diagram
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
OPERATION
Constant-on-Time (COT) Control
The MPM3683-7 employs constant-on-time
(COT) control to achieve a fast load transient
response. Figure 2 details the control stage of
the MPM3683-7.
The operational amplifier (AMP) corrects any
error voltage between Vo Sense+ and VREF.
With the help of AMP, the MPM3683-7 can
provide excellent load regulation over the entire
load range, regardless of whether it is operating
in forced continuous conduction mode (CCM) or
pulse-skip mode.
The dedicated Vo Sense- pin helps to provide
feedback remote GND sensing.
The
MPM3683-7
uses
internal
ramp
compensation to support low ESR MLCC output
capacitor solutions. The adaptive, internal ramp
is optimized so that the MPM3683-7 is stable in
the entire operating input and output voltage
ranges with a proper design of the output L/C
filter.
state to minimize conduction loss. A dead short
occurs between VIN and PGND if both the HSFET and the LS-FET are turned on at the same
time. This is called shoot through. To avoid
shoot through, a dead time (DT) is generated
internally between the HS-FET off and LS-FET
on period or the LS-FET off and HS-FET on
period.
Vo Sense+
REF
RAMP
COMP
PWM
HS-FET
Driver
TON
LS-FET
Driver
IO
IL
Figure 3: Heavy-Load Operation (PWM)
Figure 2: COT Control
Pulse-Width Modulation (PWM) Operation
Figure 3 shows how the pulse-width modulation
(PWM) is generated. AMP corrects any error
between Vo Sense+ and REF and generates a
fairly smooth DC voltage (COMP). The internal
ramp is superimposed onto COMP, and the
superimposed COMP is compared with the Vo
Sense+ signal. Whenever Vo Sense+ drops
below the superimposed COMP, the integrated
high-side MOSFET (HS-FET) turns on. The HSFET remains on for a fixed on time determined
by the input voltage, output voltage, and
selected switching frequency. After the on
period elapses, the HS-FET turns off and turns
on again when Vo Sense+ drops below the
superimposed COMP. By repeating this
operation, the MPM3683-7 regulates the output
voltage. The integrated low-side MOSFET (LSFET) turns on when the HS-FET is in its off
Continuous
Conduction
Mode
(CCM)
Operation
CCM occurs when the output current is high
and the inductor current is always above zero
amps. The MPM3683-7 can also be configured
to operate in forced CCM operation when the
output current is low (see the Mode Selection
section on page 15 for details).
In CCM operation, the switching frequency is
fairly constant (PWM mode), so the output
ripple remains almost constant throughout the
entire load range.
Pulse-Skip Operation
At light-load condition, the MPM3683-7 can be
configured to work in pulse-skip mode to
optimize the efficiency. When the load
decreases, the inductor current decreases as
well. Once the inductor current reaches zero,
the MPM3683-7 transitions from CCM to pulseskip mode if it is configured to do so (see the
Mode Selection section on page 15 for details).
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
Figure 4 shows pulse-skip mode operation in
light-load condition. When Vo Sense+ drops
below the superimposed COMP, the HS-FET
turns on for a fixed interval. When the HS-FET
turns off, the LS-FET turns on until the inductor
current reaches zero. In pulse-skip mode
operation, Vo Sense+ will not reach the
superimposed COMP while the inductor current
is approaching zero. The LS-FET driver enters
tri-state (Hi-Z) when the inductor current
reaches zero. A current modulator takes over
control of the LS-FET and limits the inductor
current below -1mA. Therefore, the output
capacitors discharge slowly to PGND through
the LS-FET. In light-load condition, the HS-FET
is not turned on as frequently in pulse-skip
mode as it is in forced CCM. As a result, the
efficiency in pulse-skip mode is improved
greatly compared to that in forced CCM
operation.
Where FSW represents the switching frequency,
and L=0.68μH represents the inductance of the
integrated inductor.
The MPM3683-7 enters PWM mode once the
output current exceeds the critical level.
Afterward, the switching frequency remains
fairly constant over the output current range.
The MPM3683-7 can be configured to operate
in forced CCM, even in a light-load condition
(see Table 1).
Mode Selection
The MPM3683-7 provides both forced CCM
operation and pulse-skip mode of operation
under light-load condition. The MPM3683-7 has
three options for switching frequency selection
(600kHz, 800kHz, and 1000kHz). Select the
operation mode under light-load condition and
the switching frequency by choosing the value
of the resistor connected between MODE and
AGND or VCC (see Table 1).
Table 1: MODE Selection
MODE
VCC
Float
243kΩ (±20%)
to GND
GND
34.8kΩ (±20%)
to GND
80.6kΩ (±20%)
to GND
Figure 4: Pulse-Skip Mode at Light Load
As the output current increases from the lightload condition, the current modulator regulation
time period becomes shorter, and the HS-FET
is turned on more frequently. Therefore, the
switching frequency increases accordingly. The
output current reaches critical levels when the
current modulator time is zero. The critical level
of the output current is determined with
Equation (1):
IOUT
( V VOUT ) VOUT
IN
2 L FSW VIN
(1)
Light-Load
Mode
Pulse skip
Pulse skip
Switching
Frequency
600kHz
800kHz
Pulse skip
1000kHz
Forced CCM
600kHz
Forced CCM
800kHz
Forced CCM
1000kHz
Soft Start (SS)
With the integrated 100nF soft-start capacitor,
the minimum soft-start time is limited to 1.6ms.
This time can be increased by adding an
external capacitor between TRK/REF and
AGND.
The value of the soft-starting capacitor CSS is
determined by:
CSS (nF)
t ss (ms) 36A
-100nF
0.6(V)
(2)
Output Voltage Tracking and Reference
The MPM3683-7 provides an analog input pin
(TRK/REF) to track another power supply or
accept an external reference. When an external
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
voltage signal is connected to TRK/REF, it acts
as a reference for the MPM3683-7 output
voltage. The Vo Sense+ voltage follows this
external voltage signal exactly, and the softstart settings are ignored. The TRK/REF input
signal can be in the range of 0.3V to 1.4V.
During the initial start-up, the TRK/REF must
first reach 600mV or above to ensure proper
operation. Afterward, it can be any value
between 0.3V and 1.4V.
Pre-Bias Start-Up
The MPM3683-7 has been designed for
monotonic start-up into pre-biased loads. If the
output is pre-biased to a certain voltage during
start-up, the IC disables the switching of both
the HS-FET and LS-FET until the voltage on
the TRK/REF pin exceeds the sensed output
voltage at Vo Sense+ pin. Before the TRK/REF
voltage reaches the pre-biased Vo Sense+ level,
if the BST voltage (from BST to SW) is lower
than 2.3V, the LS-FET is turned on to allow the
BST voltage to be charged through VCC. The
LS-FET is turned on for very narrow pulses, so
the drop-in pre-biased level is negligible.
Output Voltage Discharge
When the MPM3683-7 is disabled through EN,
output voltage discharge mode is enabled. This
causes both the HS-FET and the LS-FET to
latch off. A discharge MOSFET connected
between SW and PGND is turned on to
discharge the output voltage. The typical switch
on resistance of this MOSFET is about 80Ω.
Once the Vo Sense+ voltage drops below
10%*REF, the discharge MOSFET is turned off.
Current Sense and Over-Current Protection
(OCP)
The MPM3683-7 features on-die current
sensing and programmable over-current
protection threshold for the inductor valley
current.
The over-current protection is active when
MPM3683-7 is enabled. During the LS-FET on
state, the inductor current is sensed and
mirrored to CS pin with the ratio of GCS. By
connecting a resistor (RCS) between the CS and
AGND pins, a VCS voltage is generated which is
proportional to the inductor current cycle-bycycle. The HS-FET is allowed to turn on only
when the VCS voltage is below the internal over-
current protection voltage threshold (VOCP)
(during the LS-FET on state) to limit the
inductor valley current cycle-by-cycle. The
MPM3683-7 integrates an 10kΩ current sensing
resistor in between CS and AGND pins.
The over-current protection threshold of the
inductor valley current is determined by:
IValley
[RCS (MΩ) 0.01] VOCP
RCS (MΩ) 0.01 GCS
(3)
Calculate the value of the external current
sensing resistor RCS for the desired output
current limit ILIM by the following equation:
RCS (MΩ) 0.01
RCS (MΩ) 0.01
VOCP
(VIN VO ) VO
1
GCS (ILIM
)
VIN
2 L(H) fs (MHz)
(4)
Where VOCP=1.2V, GCS=20µA/A, L=0.68µH, and
ILIM is the desired output current limit (A).
It should be noted that the MPM3683-7
provides accurate cycle-by-cycle over-current
protection for the inductor valley current.
However, the conversion between the inductor
valley current and the output current may
involve error introduced by the tolerance of the
integrated inductor and switching frequency
variation due to the COT operation. The values
for RCS selection is shown in Table 2 for typical
applications.
Table 2: RCS Values for Typical Applications
Conditions
VIN=12V,VOUT=5V
,ILIM=8A
VIN=12V,VOUT=3.3
V,ILIM=8A
VIN=12V,VOUT=1.8
V,ILIM=10A
VIN=12V,VOUT=1.2
V,ILIM=10A
VIN=12V,VOUT=1V
,ILIM=10A
RCS
Switching
Frequency
249K
1000kHz
78.7KΩ
1000kHz
16.2KΩ
1000kHz
16KΩ
1000kHz
15KΩ
1000kHz
OCP hiccup is active 3ms after the MPM3683-7
is enabled. Once OCP hiccup is active, if the
MPM3683-7 detects an over-current condition
for 31 consecutive cycles or if the Vo Sense+
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
drops below the under-voltage protection (UVP)
threshold, the device enters hiccup mode. In
hiccup mode, the MPM3683-7 latches off the
HS-FET immediately and latches off the LSFET after zero-current detection (ZCD) is
detected. Meanwhile, the TRK/REF capacitor is
discharged as well. After about 11ms, the
MPM3683-7 attempts to soft start automatically.
If the over-current condition still remains after
3ms, the MPM3683-7 repeats this operation
cycle until the over-current condition is removed
and the output voltage rises back to the
regulation level smoothly.
Negative Inductor Current Limit
When the LS-FET detects a -9A (typical)
current, the MPM3683-7 turns off the LS-FET
for 200ns to limit the negative current.
Output-Sinking Mode (OSM)
The MPM3683-7 employs output-sinking mode
(OSM) to regulate the output voltage to the
targeted value. When the Vo Sense+ voltage is
higher than 104%*REF but lower than the OVP
threshold, OSM is triggered. During OSM
operation, the LS-FET remains on until it
reaches the -5.5A negative current limit.
Afterward, the LS-FET is turned off momentarily
(200ns) before turning on again. The
MPM3683-7 repeats this operation until the Vo
Sense+ drops below 102%*REF. Afterward, the
MPM3683-7 exits OSM after 15 consecutive
cycles of forced CCM.
Over-Voltage Protection (OVP)
The MPM3683-7 monitors the output voltage by
connecting Vo Sense+ to the tap of the output
voltage feedback resistor divider to detect an
over-voltage condition. This provides hiccup
over-voltage protection (OVP) mode.
If the Vo Sense+ voltage exceeds 116% of the
REF voltage, OVP is triggered. PG is pulled
down until it reaches the low-side negative
current limit (NOCP). Then the LS-FET is
turned off momentarily for 200ns. The HS-FET
is turned on during this period. After 200ns, the
LS-FET is turned on again. The MPM3683-7
repeats this operation to discharge any overvoltage on the output. The MPM3683-7 exits
OVP discharge mode when the feedback
voltage drops below 105%*REF.
Over-Temperature Protection (OTP)
The MPM3683-7 has an over-temperature
protection (OTP). The MPM3683-7 monitors the
junction temperature internally. If the junction
temperature exceeds the threshold value
(typically 160°C), the converter shuts off and
discharges the TRK/REF capacitors. OTP is a
non-latch protection. There is a hysteresis of
about 30°C. Once the junction temperature
drops to about 130°C, a soft start is initiated.
The OTP function is effective once
MPM3683-7 is enabled.
the
Power Good (PG)
The MPM3683-7 has a power good (PG) output.
PG is the open drain of a MOSFET. Connect
PG to VCC or another external voltage source
(less than 3.6V) through a pull-up resistor
(typically 10kΩ). After applying the input voltage,
the MOSFET turns on, so PG is pulled to GND
before TRK/REF is ready. After the Vo Sense+
voltage reaches 92.5% of the REF voltage, PG
is pulled high after a 0.9ms delay.
When the Vo Sense+ voltage drops to 80% of
the REF voltage or exceeds 116% of the
nominal REF voltage, PG is latched low. PG
can only be pulled high again after a new soft
start.
If the input supply fails to power the MPM36837, PG is clamped low, even though PG is tied to
an external DC source through a pull-up
resistor. The relationship between the PG
voltage and the pull-up current is shown in
Figure 5.
Figure 5: PG Clamped Voltage vs. Pull-Up
Current
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
EN Configuration
The MPM3683-7 turns on when EN goes high.
The MPM3683-7 turns off when EN goes low.
EN cannot be left floating for proper operation.
EN can be driven by an analog or digital control
logic signal to enable or disable the MPM36837.
The MPM3683-7 provides accurate EN
thresholds, so a resistor divider from VIN to
AGND can be used to program the input
voltage at which the MPM3683-7 is enabled.
This is highly recommended for applications
where there is no dedicated EN control logic
signal to avoid possible under-voltage lockout
(UVLO) bouncing during power-up and powerdown. The resistor divider values can be
determined by Equation (5):
VIN _ START ( V ) VIHEN
R UP R DOWN
R DOWN
(5)
Where VIHEN is 1.22V, typically.
RUP and RDOWN should be chosen so that the
EN voltage does not exceed 3.6V when VIN
reaches the maximum value.
EN can also be connected to VIN directly
through a pull-up resistor (RUP). RUP should be
chosen so that the maximum current going into
EN is 50μA. An easy calculation of RUP is given
in Equation (6):
R UP (K)
VINMAX ( V )
0.05(mA )
(6)
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
The worst-case condition occurs at VIN = 2VOUT,
shown in Equation (9):
APPLICATION INFORMATION
Setting the Output Voltage
The circuit connection is shown in Figure 6.
ICIN
IOUT
2
(9)
For simplification, choose an input capacitor
with an RMS current rating that exceeds half of
the maximum load current. The input capacitor
value determines the converter input voltage
ripple. If there is an input voltage ripple
requirement in the system, select an input
capacitor that meets the specification.
Estimate the input voltage ripple with Equation
(10):
Figure 6: Circuit Connection
R2 can be determined with Equation (7):
VREF
R 2 (k )
R1(k )
VO VREF
VIN
(7)
Table 3 lists the recommended resistor values
for common output voltages.
Table 3: Resistor Selection for Common Output
Voltages
R2 (kΩ)
VOUT (V)
1.0
3
1.2
2
1.8
1
3.3
0.442
5
0.272
Selecting the Input Capacitor
The input current to the step-down converter is
discontinuous and therefore requires a
capacitor to supply AC current to the step-down
converter while maintaining the DC input
voltage. Use ceramic capacitors for the best
performance. During the layout, place the input
capacitors as close to VIN as possible.
The capacitance can vary significantly with the
temperature. Capacitors with X5R and X7R
ceramic dielectrics are recommended because
they are fairly stable over a wide temperature
range and offer very low ESR.
The capacitors must have a ripple current rating
that exceeds the converter’s maximum input
ripple current. Estimate the input ripple current
with Equation (8):
ICIN IOUT
VOUT
V
(1 OUT )
VIN
VIN
(8)
IOUT
V
V
OUT (1 OUT )
FSW CIN
VIN
VIN
(10)
The worst-case condition occurs at VIN = 2VOUT,
shown in Equation (11):
VIN
IOUT
1
4 FSW CIN
(11)
Selecting the Output Capacitor
The output capacitor maintains the DC output
voltage. Use POSCAP or ceramic capacitors.
Estimate the output voltage ripple with Equation
(12):
VOUT
VOUT
V
1
) (12)
(1 OUT ) (RESR
FSW L
VIN
8 FSW COUT
When
using
ceramic
capacitors,
the
capacitance dominates the impedance at the
switching frequency. The capacitance also
dominates the output voltage ripple. For
simplification, estimate the output voltage ripple
with Equation (13):
VOUT
VOUT
2
8 FSW L COUT
(1
VOUT
) (13)
VIN
The ESR dominates the switching frequency
impedance for the POSCAP capacitors. For
simplification, the output ripple can be
approximated with Equation (14):
VOUT
VOUT
V
(1 OUT ) R ESR
FSW L
VIN
(14)
Where L is fixed at 0.68μH internally.
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
PCB Layout Guidelines
Efficient PCB layout is critical for stable
operation. For the best performance, refer to
Figure 6 and follow the guidelines below.
1. Place the input MLCC capacitors as close
to the VIN and PGND pins as possible.
2. Place the major MLCC capacitors on the
same layer as the MPM3683-7.
3. Maximize the VIN and PGND copper plane
to minimize parasitic impedance.
4. Ensure that the high-current paths (PGND,
IN, and OUT) have short, direct, and wide
traces.
5. Place the ceramic input capacitor close to
IN and PGND.
6. Keep the input capacitor and the IN
connection as short and wide as possible.
7. Place as many PGND vias as possible as
close to PGND as possible to minimize both
the parasitic impedance and thermal
resistance.
8. Place the external feedback resistors next
to Vo Sense+.
Figure 7: Recommended Layout
9. Keep the feedback network away from the
switching node.
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
TYPICAL APPLICATION CIRCUITS
4-16V
5,8,9,27
VIN
R2
499kΩ
CIN4
CIN3 CIN2 CIN5 CIN1
10µF
10µF 10µF 0.1µF 100µF
VIN
14,15,16,
19,20,28
Rcs
249kΩ
GND
TRK/REF
VCC
MODE
CS
GND
AGND
C6
25 NS
R10
272R
22µF
22µF 22µF
22µF
R11
0
R1
2k Ω
24
COUT7
22µF
VOUT
R12
0
GND
R9
0
C2
27nF
AGND
23
22
Vo Sense-
18,21
13
C1
1µF
PG
10,11,12
VCC
R4
100kΩ
PGND
4
PG
Vo Sense+
22µF
C3
4.7nF
26
MPM3683-7
EN
22µF
17
BST
EN
VOUT
COUT1 COUT2 COUT3 COUT4 COUT5COUT6
VOUT
SW
3
5V/8A
1,2,6,7
GND
AGND
AGND
AGND
Figure 8: 12VIN 5V/8A Output, CCM1000KHz
4-16V
VIN
5,8,9,27
CIN4 CIN3 CIN2 CIN5 CIN1
R2
499kΩ
10µF
10µF 10µF0.1µF
VOUT
100µF
SW
14,15,16,
19,20,28
13
C1
1µF
23
22
PG
10,11,12
GND
AGND
C6
25 NS
R10
442R
22µF
22µF
22µF
22µF
R11
0
R1
2k Ω
24
TRK/REF
VCC
MODE
CS
Rcs
78.7kΩ
GND
Vo Sense-
22µF
VOUT
R12
0
GND
R9
0
C2
27nF
AGND
VCC
R4
100kΩ
18,21
4
PG
Vo Sense+
PGND
EN
22µF
C3
4.7nF
26
MPM3683-7
EN
22µF
17
BST
3
3.3V/8A
VOUT
COUT1 COUT2 COUT3 COUT4 COUT5 COUT6 COUT7
1,2,6,7
VIN
AGND
AGND
GND
AGND
Figure 9: 12VIN 3.3V/8A Output, CCM1000KHz
4-16V
VIN
5,8,9,27
VIN
CIN4 CIN3 CIN2 CIN5 CIN1
R2
499kΩ
10µF
10µF 10µF0.1µF
VOUT
100µF
SW
14,15,16,
19,20,28
BST
GND
13
C1
1µF
23
22
Rcs
16.2kΩ
AGND
PG
Vo Sense-
TRK/REF
VCC
MODE
CS
GND
17
22µF
C3
4.7nF
C6
25 NS
R10
1kΩ
24
C2
27nF
AGND
VCC
4
R4
100kΩ
22µF
26
Vo Sense+
10,11,12
PG
EN
18,21
EN
MPM3683-7
PGND
3
1.8V/10A
VOUT
COUT1 COUT2 COUT3 COUT4 COUT5 COUT6 COUT7
1,2,6,7
AGND
22µF
22µF
22µF
R11
0
R1
2kΩ
R12
0
22µF
22µF
VOUT
GND
R9
0
AGND
GND
AGND
Figure 10: 12VIN 1.8V/10A Output, CCM1000KHz
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MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
TYPICAL APPLICATION CIRCUITS (continued)
4-16V
VIN
5,8,9,27
VIN
CIN4 CIN3 CIN2 CIN5 CIN1
R2
499kΩ
10µF
10µF 10µF0.1µF
VOUT
100µF
13
C1
1µF
23
22
PG
Vo Sense-
TRK/REF
VCC
MODE
CS
10,11,12
Rcs
16kΩ
GND
GND
AGND
22µF 22µF
C6
25 NS
R1
2kΩ
R10
2kΩ
22µF
22µF
R11
0
24
22µF
VOUT
R12
0
GND
R9
0
C2
27nF
AGND
VCC
R4
100kΩ
18,21
4
PG
22µF
C3
4.7nF
26
Vo Sense+
PGND
EN
22µF
17
BST
MPM3683-7
EN
COUT1 COUT2 COUT3 COUT4 COUT5 COUT6 COUT7
14,15,16,
19,20,28
SW
3
1.2V/10A
VOUT
1,2,6,7
AGND
AGND
GND
AGND
Figure 11: 12VIN 1.2V/10A Output, CCM1000KHz
4-16V
VIN
5,8,9,27
VIN
CIN4 CIN3 CIN2 CIN5 CIN1
R2
499kΩ
10µF
10µF 10µF0.1µF
VOUT
100µF
SW
14,15,16,
19,20,28
BST
GND
13
C1
1µF
23
22
Rcs
15kΩ
AGND
PG
Vo Sense-
TRK/REF
VCC
MODE
CS
GND
17
22µF
C3
4.7nF
C6
25 NS
R10
3kΩ
24
C2
27nF
AGND
VCC
4
R4
100kΩ
22µF
26
Vo Sense+
10,11,12
PG
EN
18,21
EN
MPM3683-7
PGND
3
1V/10A
VOUT
COUT1 COUT2 COUT3 COUT4 COUT5 COUT6 COUT7
1,2,6,7
AGND
22µF
22µF
22µF 22µF
R11
0
R1
2kΩ
R12
0
22µF
VOUT
GND
R9
0
AGND
GND
AGND
Figure 12: 12VIN 1V/10A Output, CCM1000KHz
MPM3683-7 Rev. 1.01
www.MonolithicPower.com
7/27/2020
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2020 MPS. All Rights Reserved.
23
MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
PACKAGE INFORMATION
QFN-28 (7mmx7mmx4mm)
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) SHADED AREA IS THE KEEP-OUT ZONE. ANY PCB
METAL TRACE AND VIA ARE NOT ALLOWED TO
CONNECT TO THIS AREA ELECTRICALLY OR
MECHANICALLY.
3) LEAD COPLANARITY SHALL BE 0.08
MILLIMETERS MAX.
4) JEDEC REFERENCE IS MO-220.
5) DRAWING IS NOT TO SCALE.
MPM3683-7 Rev. 1.01
www.MonolithicPower.com
7/27/2020
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2020 MPS. All Rights Reserved.
24
MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
CARRIER INFORMATION
Detail A
All package in Tray
Pin 1
ABCD
1
Detail A
Note:
This is a schematic diagram of Tray. Different packages correspond to different trays with different length, width and height
Part Number
Package
Description
Quantity/Reel
Quantity/Tube
Quantity/Tray
Reel
Diameter
Carrier
Tape
Width
Carrier
Tape
Pitch
MPM3683GQN7
QFN 7x7x 4
N/A
N/A
416
N/A
N/A
N/A
MPM3683-7 Rev. 1.01
www.MonolithicPower.com
7/27/2020
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2020 MPS. All Rights Reserved.
25
MPM3683-7 – 16V, 8A, STEP-DOWN POWER MODULE
Revision History
Revision #
1.01
Revision
Date
Description
6/2/2020
update Thermal Derating curve;
Add EMI circuit;
Remove the TRK/REF pin to VOSNS- pin capacitor;
Add Table 2 to descript the Rcs and current limit
relationship;
PCB Layout Guideline modified;
Add note for EN of ABS list:
Modified the Block Diagram to add the values for
internal components;
Add MSL information to ORDERING INFORMATION
Add CARRIER INFORMATION in the last page
Pages Updated
page9
page13
page23.24
page17
page22
page5
page14
Page3
page25
NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third
party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not
assume any legal responsibility for any said applications.
MPM3683-7 Rev. 1.01
www.MonolithicPower.com
7/27/2020
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2020 MPS. All Rights Reserved.
26
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