MPM3695-25
16V, 20A, Scalable
DC/DC Power Module with PMBus
DESCRIPTION
FEATURES
The MPM3695-25 is a scalable, fully integrated
power module with a PMBus interface. The
MPM3695-25 offers a complete power solution
that achieves up to 25A of peak output current
with excellent load and line regulation over a
wide input voltage range. It operates with high
efficiency over a wide load range and can be
paralleled to deliver a higher load current.
The MPM3695-25 adopts MPS’s proprietary,
multi-phase constant-on-time (MCOT) control,
which provides ultra-fast transient response and
simple loop compensation. The PMBus
interface provides module configurations and
monitoring of key parameters.
The MPM3695-25 features full protection
features, including over-current protection
(OCP), over-voltage protection (OVP), undervoltage protection (UVP), and over-temperature
protection (OTP). It requires a minimal number
of readily available external components and is
available in a QFN-59 (10mmx12mmx4mm)
package.
Wide Input Voltage Range from 3V
- 3V-16V Input Voltage with External VCC
- 4V-16V Input Voltage with Internal VCC
0.5V to 5.5V Output Voltage Range
20A Continuous Output Current, Peak 25A
Auto Interleaving for Multi-Phase Operation
Auto Compensation with Adaptive MCOT
for Ultra-Fast Transient Response
1% Reference Voltage Over 0°C to +70°C
Junction Temperature Range
True Remote Sense of Output Voltage
PMBus 1.3 Compliant
Telemetry Read-Back Including VIN, VOUT,
IOUT, Temperature, and Faults
Programmable via PMBus
o Current Limit
o Selection of Pulse-Skip Mode or
Continuous Conduction Mode (CCM)
o Soft-Start Time
o Switching Frequency
o Fault Limits
Available in a QFN-59 (10mmx12mmx4mm)
Package
APPLICATIONS
Telecom and Networking Systems
Industrial Equipment
Servers and Computing
FPGAs/ASIC AI and Data Mining
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”
and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
MPM3695-25 Rev. 1.01
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1
MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
TYPICAL APPLICATION
RTAKE
VIN
TAKE
BST
OUT
CIN
R1
CFF
CTRL
COUT
PG
VOSNS+
VCC
VOSNS-
VCC>
ADDR
ALT
SCL
IREF
SDA
ISUM
SET
R2
PASS
RADDR
PGND AGND
Single Phase Operation
Dual Phase Operation
MPM3695-25 Rev. 1.01
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2
MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
ORDERING INFORMATION
Part Number
MPM3695GRF-25-xxxx*
Package
QFN-59
(10mmx12mmx4mm)
Top Marking
\
\
EVKT-MPM3695-25-A
See Below
* -xxxx is the configuration code identifier for the register settings stored in the MTP memory. Each “x” can be a
hexadecimal value between 0 and F. The part number with default register setting is MPM3695GRF-25-0022.
Please contact MPS to create a unique configuration identifier for customized design.
TOP MARKING
MPS: MPS prefix
YY: Year code
WW: Week code
MP3695: Part number
LLLLLLLLL: Lot number
25: Suffix of part number
M: Module
EVALUATION KIT EVKT-MPM3695-25-A
EVKT-MPM3695-25-A Kit Contents: (Items can be ordered separately).
#
Part Number
Item
1
2
EVM3695-25-RF-02A
MPM3695GRF-25-0022
3
EVKT-USBI2C-02*
MPM3695-25 Single Phase Evaluation Board
1pcs MPM3695-25 Module
Includes One USB to I2C Dongle, One USB Cable,
and One Ribbon Cable
Quantity
1
1
1
Order Directly from MonolithicPower.com or MPS distributors
MPM3695-25 Rev. 1.01
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3
MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
PACKAGE REFERENCE
TOP VIEW
QFN-59 (10mmx12mmx4mm)
MPM3695-25 Rev. 1.01
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9/9/2019
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
PIN FUNCTIONS
PIN #
2,6
3
Name
AGND
IREF
4
VOSNS-
5
VOSNS+
7
VCC
8
9-15, 58
31-35
18-28, 36,
37, 50, 51,
59
38
39
40
41
BST
SW
VOUT
PGND
VCC>
VDRV
SCL
SDA
42
ALT
43
CTRL
44
PG
47
PASS
48
TAKE
49
SET
52, 53
VIN
55
ADDR
56
ISUM
1, 16, 17,
29, 30, 45,
46, 54, 57
NC
Description
Analog ground. Reference point of the control circuit.
Current reference output. Keep this pin floating.
Output voltage sense negative return. Connect directly to the GND sense point
of the load. Short to GND if remote sense is not used.
Output voltage sense positive return. Connect this pin to the positive sense point
of the output voltage to provide feedback voltage to the system.
Output of the internal 3.3V LDO. The driver and control circuits are powered by
this voltage. Must be connected to Pin 38.
Bootstrap. Keep this pin floating.
Switch node. Keep them floating.
Module output voltage node. Connect with wide PCB copper plane.
Power ground. This pin is the reference point of the regulated output voltage.
Connect with PCB copper planes as wide as possible.
Input of driver circuit. Must be connected to Pin 7.
Decoupling pin for 3.3V driver power supply.
PMBus serial clock.
PMBus serial data.
PMBus alert. Open drain output, active low. A pull-up resistor must be connected
to a 3.3V rail.
Converter control. CTRL is a digital input that turns the regulator on or off. Drive
CTRL high to turn the regulator on, drive it low to turn it off. Do not float this pin.
Multi-purpose power good output. This pin can be configured as an output pin for
single-phase operation or an input and output pin for multi-phase configuration. A
pull-up resistor connected to a DC voltage is required to indicate high if the output
voltage is higher than 90% of the nominal voltage. Refer to the application section
for detailed configuration.
Passes RUN signal to the next phase. Refer to the applications section for
connection details.
Receives RUN signal from the previous phase. Refer to the typical applications
section for connection details.
PWM signal. The set signal turns on the HSFET when a RUN signal appears. For
multi-phase operation, tie the SET pins of all the phases together.
Supply voltage. This pin provides power to the module. Decoupling capacitors are
required to be connected between VIN and GND. Connect VIN with a wide copper
plane.
PMBus slave address setting pin. Connect a resistor between this pin to AGND
to set the address of this device.
Reference current output. For single-phase operation, keep this pin floating; for
multi-phase operation, connect ISUM pins of all phases together.
No Internal Connection.
MPM3695-25 Rev. 1.01
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5
MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
ABSOLUTE MAXIMUM RATINGS (1)
Supply voltage (VIN) ...................................... 18V
VSW (DC) ................................... -0.3V to VIN + 0.3V
VSW (25ns) (2) ..................................... -3V to 25V
VSW (25ns) .......................................... -5V to 25V
VOUT ............................................................ 5.5V
VBST........................................................ VSW + 4V
VCC ............................................................... 4.5V
CTRL current (ICTRL) ................................. 2.5mA
All other pins .................................. -0.3V to 4.3V
Continuous power dissipation (TA = +25°C) (3)
........................................................................ 5W
Junction temperature ................................ 170°C
Lead temperature...................................... 260°C
Storage temperature .................-65°C to +170°C
Thermal Resistance (5)
θJA
θJB
QFN-59 (10x12x4mm) ........... 17 ...... 3.4 ... °C/W
NOTES:
1) Exceeding these ratings may damage the device.
2) Measured by using differential oscilloscope probe.
3) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation produces an excessive die temperature, causing
the regulator to go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
4) The device is not guaranteed to function outside of its
operating conditions.
5) Measured on EVM3695-25-RF-02A Demo Board 6-LAYERS
PCB.
Recommended Operating Conditions (4)
Supply voltage (VIN) ............................ 4V to 16V
Output voltage (VOUT) ...................... 0.5V to 5.5V
External VCC bias .......................... 3.12V to 3.6V
CTRL current (ICTRL) ..................................... 1mA
Operating junction temp. (TJ). ...-40°C to +125°C
MPM3695-25 Rev. 1.01
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
ELECTRICAL CHARACTERISTICS
VIN = 12V, TJ = -40°C to 125°C, unless otherwise noted.
Parameters
VIN Supply Current
Supply current (shutdown)
Input Voltage
Input voltage range
Symbol
Condition
IIN
VCTRL = 0V
VIN
No external VCC
With 3.3V External VCC
Output Voltage
Output voltage range(6)
Load regulation(6)
VOUT_RANGE
VOUT_DC_Load
Line regulation(6)
VOUT_DC_Line
Min
Typ
Max
Units
2.5
4
mA
16
16
V
5.5
±0.5
V
%VOUT
±0.5
%VOUT
27
A
5
A
32
A
-13
A
4
3
0.5
IOUT from 0A to 25A
VIN from 4V to 16V,
IOUT = 20A
Current Limit
Valley current limit
ILIM
Default setting
Min valley current limit
programmable value(6)
Max current limit
programmable value(6)
Low-side negative current
ILIM_NEG_OVP
limit in OVP
CTRL
CTRL ON threshold
CTRLON
CTRL OFF threshold
CTRLOFF
Frequency and Timer
Switching frequency
fSW
Default Value
(6)
Minimum on time
TON_MIN
Fs = 1000kHz, Vo = 0.6V
(6)
Minimum off time
TOFF_MIN
VFB = 580mV
Output Over-Voltage and Under-Voltage Protection
Default setting (D4h[1:0] =
OVP threshold
VOVP
00)
Default setting (D9h[3:2] =
UVP threshold
VUVP
10)
Max programmable OVP
VOVP_max
D4h[1:0] = 11
threshold
Min programmable OVP
VOVP_min
D4h[1:0] = 00
threshold
Max programmable UVP
D9h[3:2] = 11
VUVP_max
threshold
Min programmable UVP
D9h[3:2] = 00
VUVP_min
threshold
2.04
1.66
2.2
600
50
220
V
V
kHz
ns
ns
111%
115%
119%
VREF
75%
79%
83%
VREF
126%
130%
134%
VREF
111%
115%
119%
VREF
80%
84%
88%
VREF
65%
69%
73%
VREF
MPM3695-25 Rev. 1.01
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9/9/2019
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, TJ = -40°C to 125°C, unless otherwise noted.
Parameters
OSM threshold rising
OSM threshold falling
Symbol
VOSM_RISE
VOSM_FALL
Condition
Min
Typ
104%
102%
Max
Units
VREF
VREF
1.28
V
bits
LSB
kHz
672
606
609
mV
mV
mV
ADC(6)
Voltage range
ADC resolution
DNL
Sample rate
DAC (Feedback Voltage)
Range
Feedback accuracy
Feedback accuracy
0
10
1
3
VFB
VFB
Resolution(6)
Feedback voltage with margin
high (6)
TJ = +25°C
TJ = -40°C to 125°C
500
594
591
Per LSB
VFB_MG_HIGH
Feedback voltage with margin
VFB_MG_LOW
low (6)
Soft Start and Turn On/Off Delay
Soft-start time
tSS
Turn-on
delay(6)
Turn-off delay
600
600
600
2
mV
672
mV
500
mV
2
ms
tON_DELAY
Default setting
0
ms
tOFF_DELAY
Default setting
0
ms
VFB = VREF
50
Error Amplifier
Feedback Current
IFB
Soft Shutdown
Soft shutdown discharge FET
RON_DISCH
Under-Voltage Lockout (UVLO)
VCC under-voltage lockout
VCCVth
threshold rising
VCC under-voltage lockout
VCCHYS
threshold hysteresis
Min input programmable turnVIN_ON_MIN
on voltage
Max input programmable
VIN_ON_MAX
turn-on voltage
Min input programmable turnVIN_OFF_MIN
off voltage
Max input programmable
VIN_OFF_MAX
turn-off voltage
100
60
Default setting
Default setting
VCC= 3.3V
VCC= 3.3V
2.6
2.75
nA
Ω
2.9
V
200
mV
3
V
15
V
2.75
V
14.75
V
MPM3695-25 Rev. 1.01
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9/9/2019
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© 2019 MPS. All Rights Reserved.
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, TJ = -40°C to 125°C, unless otherwise noted.
Parameters
Power Good
Symbol
Power good high threshold
PGVth_Hi
Power good low threshold
PGVth_Lo
Power good low to high delay
Power good sink current
capability
Power good leakage current
PGTd
VPG
IPG_LEAK
VOL_100
Power good low-level output
voltage
VOL_10
Thermal Protection (TP)
TP fault rising threshold (6)
TP fault falling threshold (6)
TP warning rising threshold (6)
TP warning falling threshold (6)
Min TP warning temp (6)
Max TP warning temp (6)
Monitoring Parameters
Output voltage monitor
accuracy
Output voltage bit resolution
Output current monitor
accuracy(6)
Output current bit resolution(6)
Input voltage monitor accuracy
Input voltage bit resolution(7)
TSD_Rise
TSD_Fall
TWARN_Rise
TWARN_Fall
TSD_WARN_MIN
TSD_WARN_MAX
Condition
Min
FB from low to high, default
setting (D9h[1:0] = 01)
FB from high to low, default
setting (D9h[3:2] = 10)
Default setting (D1h[5:2] =
0000)
Typ
VREF
79%
VREF
2.0
ms
0.3
VPG = 3V
VIN = 0V, pull PGOOD up to
3.3V through a 100kΩ
resistor, TJ = 25°C
VIN = 0V, pull PGOOD up to
3.3V through a 10kΩ
resistor, TJ = 25°C
1.5
600
MIOUT_ACC
Vo = 1.2V, fs = 600kHz,
Io = 20A
µA
720
700
820
145
125
130
110
35
160
-2%
0.6
°C
°C
°C
°C
°C
°C
2%
1.5
MIN_ACC
V
mV
Default setting
Default setting
Default setting
Default setting
Vo=0.6V
Units
92.5%
IPG = 10mA
MVOUT_ACC
Max
V
mV
-10%
20
10%
A
-2%
62.5
12
25
2%
mA
V
mV
MPM3695-25 Rev. 1.01
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, TJ = -40°C to 125°C, unless otherwise noted.
Parameters
Symbol
Condition
PMBus DC Characteristics (SDA, SCL, ALERT) (6)
Input high voltage
VIH
Input low voltage
VIL
Output low voltage
VOL
IOL = 1mA
Input leakage current
ILEAK
SDA, SCL, ALERT = 3.3V
Transient voltage including
Maximum voltage (SDA, SCL,
VMAX
ringing
ALERT, CTRL)
Pin capacitance on SDA,SCL
CPIN
PMBus Timing Characteristics(7)
Min operating frequency
Max operating frequency
Between stop and start
Bus free time
condition
Holding time
Repeated start condition set-up
time
Stop condition set-up time
Data hold time
Data set-up time
Clock low time out
Clock low period
Clock high period
Clock/data fall time
Clock/data rise time
Min
Typ
Max
Units
2.1
0.4
10
V
V
V
µA
3.6
V
10
pF
0.8
-10
-0.3
3.3
10
1000
kHz
kHz
4.7
µs
4.0
µs
4.7
µs
4.0
300
250
25
4.7
4.0
µs
ns
ns
ms
µs
µs
ns
ns
35
50
300
1000
NOTE:
6) Guaranteed by design.
7) Guaranteed by design, not tested in production. The parameter is tested during parameters characterization.
MPM3695-25 Rev. 1.01
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
TYPICAL PERFORMANCE CHARACTERISTICS
VIN=12V, VOUT=1.8V, FSW=600kHz, TA=+25°C, unless otherwise noted.
Power Loss vs. Load Current
100
95
90
85
80
75
70
65
60
55
50
6
Vin=4V,Vo=0.5V,Fsw=600K
Vin=12V,Vo=0.5V,Fsw=600K
Vin=16V,Vo=0.5V,Fsw=600K
0
5
10
15
LOAD CURRENT(A)
20
Vin=16V,Vo=0.5V,Fsw=600K
3
2
1
0
25
0
5
10
15
LOAD CURRENT (A)
20
25
Power Loss vs. Load Current
7
Vin=4V,Vo=1V,Fsw=600K
Vin=12V,Vo=1V,Fsw=600K
Vin=16V,Vo=1V,Fsw=600K
6
POWER LOSS (W)
EFFICIENCY(%)
100
95
90
85
80
75
70
65
60
55
50
Vin=12V,Vo=0.5V,Fsw=600K
4
Efficiency vs. Load Current
Vin=4V,Vo=1V,Fsw=600K
Vin=12V,Vo=1V,Fsw=600K
5
4
3
2
1
Vin=16V,Vo=1V,Fsw=600K
0
0
5
10
15
LOAD CURRENT(A)
20
0
25
7
95
6
POWER LOSS (W)
100
90
85
80
Vin=4V,Vo=1.8V,Fsw=600K
Vin=12V,Vo=1.8V,Fsw=600K
75
5
10
15
20
LOAD CURRENT(A)
25
Power Loss vs. Load Current
Efficiency vs. Load Current
EFFICIENCY (%)
Vin=4V,Vo=0.5V,Fsw=600K
5
POWER LOSS (W)
EFFICIENCY(%)
Efficiency vs. Load Current
Vin=4V,Vo=1.8V,Fsw=600K
Vin=12V,Vo=1.8V,Fsw=600K
5
Vin=16V,Vo=1.8V,Fsw=600K
4
3
2
1
Vin=16V,Vo=1.8V,Fsw=600K
0
70
0
5
10
15
LOAD CURRENT (A)
20
25
0
5
10
15
20
25
LOAD CURRENT (A)
MPM3695-25 Rev. 1.01
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
VIN=12V, VOUT=1.8V, FSW=600kHz, TA=+25°C, unless otherwise noted.
Power Loss vs. Load Current
100
95
90
85
80
75
70
65
60
55
50
9
POWER LOSS (W)
EFFICIENCY(%)
Efficiency vs. Load Current
Vin=12V,Vo=3.3V,Fsw=600K
Vin=16V,Vo=3.3V,Fsw=600K
0
5
10
15
20
LOAD CURRENT(A)
8
Vin=12V,Vo=3.3V,Fsw=600K
7
Vin=16V,Vo=3.3V,Fsw=600K
6
5
4
3
2
1
0
25
0
5
10
15
20
LOAD CURRENT (A)
REGULATION(%)
REGULATION (%)
Vin=12V,Vo=0.5V,Fsw=600K
Vin=12V,Vo=1V,Fsw=600K
Vin=12V,Vo=1.8V,Fsw=600K
Vin=12V,Vo=3.3V,Fsw=600K
Vin=12V,Vo=5.5V,Fsw=600K
0
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
25
25
Full Load,Vo=0.5V,Fsw=600K
Full Load,Vo=1V,Fsw=600K
Full Load,Vo=1.8V,Fsw=600K
Full Load,Vo=3.3V,Fsw=600K
Full Load,Vo=5.5V,Fsw=600K
4
Thermal De-rating vs. Ambient
Temp@200LFM Air Flow
6
8
10
12
INPUT VOLTAGE (V)
14
16
Current Sharing
30
30
IO_U1/IO_U2 CURRENT (A)
LOAD CURRENT (A)
10
15
20
LOAD CURRENT(A)
Regulation vs. Input Voltage
Regulation vs. Load Current
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
5
25
20
15
Vo=5.5V
Vo=3.3V
Vo=1.8V
Vo=1V
Vo=0.5V
10
5
25
20
15
10
Io_U1
Io_U2
5
0
0
-40
-20
0
20
40
60
80
AMBIENT TEMPERATURE(° C)
100
-10
10
30
50
LOAD CURRENT (A)
MPM3695-25 Rev. 1.01
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
Single Phase, VIN=12V, VOUT=1.8V, FSW=600kHz, TA=+25°C, unless otherwise noted.
VIN Start-Up
VIN Start-Up
0A
25A
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
2A/div.
CH4: IOUT
20A/div.
2ms/div.
2ms/div.
VIN Shutdown
VIN Shutdown
0A
25A
CH1: VOUT
1V/div.
CH1: VOUT
1V/div.
CH2: VIN
5V/div.
CH2: VIN
5V/div.
CH3: VSW
5V/div.
CH4: IOUT
20A/div.
CH3: VSW
5V/div.
CH4: IOUT
5A/div.
40ms/div.
200μs/div.
EN Start-Up
EN Start-Up
0A
25A
CH1: VOUT
1V/div.
CH1: VOUT
1V/div.
CH2: VEN
2V/div.
CH2: VEN
2V/div.
CH3: VSW
5V/div.
CH4: IOUT
20A/div.
CH3: VSW
5V/div.
CH4: IOUT
20A/div.
1ms/div.
1ms/div.
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
Single Phase, VIN=12V, VOUT=1.8V, FSW=600kHz, TA=+25°C, unless otherwise noted.
EN Shutdown
EN Shutdown
IOUT=0A
IOUT=25A
CH1: VOUT
1V/div.
CH1: VOUT
1V/div.
CH2: VEN
2V/div.
CH2: VEN
2V/div.
CH3: VSW
5V/div.
CH4: IOUT
20A/div.
CH3: VSW
5V/div.
CH4: IOUT
20A/div.
40ms/div.
400μs/div.
SCP Entry
SCP Entry
IOUT=0A
IOUT=0A
CH1: VOUT
1V/div.
CH1: VOUT
1V/div.
CH2: VIN
10V/div.
CH2: VIN
10V/div.
CH3: VSW
5V/div.
CH4: IOUT
20A/div.
CH3: VSW
5V/div.
CH4: IOUT
20A/div.
10ms/div.
10ms/div.
SCP Entry
SCP Recovery
IOUT=25A
IOUT=25A
CH1: VOUT
1V/div.
CH1: VOUT
1V/div.
CH2: VIN
10V/div.
CH2: VIN
10V/div.
CH3: VSW
5V/div.
CH3: VSW
5V/div.
CH4: IOUT
20A/div.
CH4: IOUT
20A/div.
10ms/div.
10ms/div.
MPM3695-25 Rev. 1.01
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
Single Phase, VIN=12V, VOUT=1.8V, FSW=600kHz, TA=+25°C, unless otherwise noted.
SCP State Steady
Ripple
IOUT=0A
CH1: VOUT
1V/div.
CH1:
VOUT/AC
20mV/div.
CH2: VIN
10V/div.
CH3: VSW
5V/div.
CH4: IOUT
20A/div.
CH4: IOUT
10A/div.
4ms/div.
2μs/div.
Ripple
Load Transient
IOUT=25A
6.25-12.5A, 2.5A/μs
CH1:
VOUT/AC
20mV/div.
CH1:
VOUT/AC
20mV/div.
CH4: IOUT
10A/div.
CH4: IOUT
5A/div.
2μs/div.
100μs/div.
Thermal 12V to 1.8V/20A
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
2 Phase, VIN=12V, VOUT=1.8V, FSW=600kHz, TA=+25°C, unless otherwise noted.
MPM3695-25 Rev. 1.01
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE
VIN Shutdown,
VIN Start Up,
Io=50A
Io=50A
CH1: VOUT
1V/div.
CH1: VOUT
1V/div.
CH2: VSW1
5V/div.
CH2: VSW1
5V/div.
CH2: VSW2
5V/div.
CH2: VSW2
5V/div.
CH2: IOUT
50A/div.
CH2: IOUT
50A/div.
1ms/div.
400μs/div.
EN Start Up,
EN Start Up,
Io=0A
Io=50A
CH1: VOUT
1V/div.
CH2: VEN
2V/div.
CH1: VOUT
1V/div.
CH2: VEN
2V/div.
R1: VSW1
5V/div.
R1: VSW1
5V/div.
CH2: VSW2
5V/div.
CH2: IOUT
25A/div.
CH2: VSW2
5V/div.
CH2: IOUT
25A/div.
1ms/div.
1ms/div.
EN Shutdown,
EN Shutdown,
Io=0A
Io=50A
CH1: VOUT
1V/div.
CH2: VEN
2V/div.
CH1: VOUT
1V/div.
CH2: VEN
2V/div.
R1: VSW1
5V/div.
R1: VSW1
5V/div.
CH2: VSW2
5V/div.
CH2: IOUT
25A/div.
CH2: VSW2
5V/div.
CH2: IOUT
25A/div.
200ms/div.
TYPICAL PERFORMANCE CHARACTERISTICS
80μs/div.
(Continued)
2 Phase, VIN=12V, VOUT=1.8V, FSW=600kHz, TA=+25°C, unless otherwise noted.
MPM3695-25 Rev. 1.0
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE
SCP Entry
SCP Recovery
IOUT=0A
IOUT=0A
CH1: VOUT
1V/div.
CH1: VOUT
1V/div.
CH2: VIN
10V/div.
CH3: VSW2
5V/div.
REF: VSW1
5V/div.
CH4: IOUT
50A/div.
CH2: VIN
10V/div.
CH3: VSW2
5V/div.
REF: VSW1
5V/div.
CH4: IOUT
50A/div.
10ms/div.
10ms/div.
SCP Recovery
SCP Entry
IOUT=50A
IOUT=50A
CH1: VOUT
1V/div.
CH1: VOUT
1V/div.
CH2: VIN
10V/div.
REF: VSW1
5V/div.
CH3: VSW2
5V/div.
CH4: IOUT
50A/div.
CH2: VIN
10V/div.
REF: VSW1
5V/div.
CH3: VSW2
5V/div.
CH4: IOUT
50A/div.
10ms/div.
10ms/div.
SCP State Steady
CH1: VOUT
1V/div.
CH2: VIN
10V/div.
REF: VSW1
5V/div.
CH3: VSW2
5V/div.
CH4: IOUT
50A/div.
10ms/div.
MPM3695-25 Rev. 1.0
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
2 Phase, VIN=12V, VOUT=1.8V, FSW=600kHz, TA=+25°C, unless otherwise noted.
VOUT Ripple@VIN=12V, IO=0A
VOUT Ripple@VIN=12V, IO=50A
CH1:
VOUT/AC
5mV/div.
CH1:
VOUT/AC
5mV/div.
CH4: IOUT
25A/div.
CH4: IOUT
25A/div.
800ns/div.
800ns/div.
Load Transient @ 25%-50%,2.5A/us
VIN = 12V, VOUT = 1.8V, Io=40A, TA = 25ºC
CH1:
VOUT/AC
50mV/div.
CH4: IOUT
10A/div.
80μs/div.
MPM3695-25 Rev. 1.01
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
BLOCK DIAGRAM
MPM3695-25 Rev. 1.01
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
VFB+RAMP
VCOMP
COMP-OUT
SET
RUN1
PWM1
PASS1/TAKE2
RUN2
PWM2
PASS2/TAKE3
RUN3
PWM3
PASS3/TAKE4
RUN4
PWM4
PASS4/TAKE1
t0 t1
t2
t3 t4
t5
t6 t7
t8
t9 t10
t11
t12
t13
t14
Figure 1: Multi-Phase Operation Timing Diagram (Steady State)
VFB+RAMP
VCOMP
COMP_OUT
SET
RUN1
PWM1
PASS1/TAKE2
RUN2
PWM2
PASS2/TAKE3
RUN3
PWM3
PASS3/TAKE4
RUN4
PWM4
PASS4/TAKE1
t0
t1
t2
t3
t4
t5
t6
t7
t8
t9
t10
t11
t12
t13
Figure 2: Multi-Phase Operation Timing Diagram (Transient)
MPM3695-25 Rev. 1.01
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
OPERATION
The MPM3695-25 is a fully integrated power
solution with up to 25A output current in a
10x12x4mm QFN package. For applications
that require more than 25A, the MPM3695-25
can be connected in parallel to provide a higher
output current. The MPM3695-25 employs
constant-on-time (COT) control to provide fast
transient response. The internal ramp
compensation guarantees stable operation for
applications using zero-ESR ceramic output
capacitors.
Multi-Phase Operation
In a multi-phase configuration, one master
phase and up to five slave phases are
connected in parallel. The output current is
shared equally among all phases. The typical
application circuit illustrates four MPM3695-25s
in a multi-phase configuration. The TAKE pin of
the master phase is required to be pulled up to
a voltage source through a resistor. The
MPM3695-25
detects
its
master/slave
configuration by monitoring the state of the
TAKE pin during start-up. The PASS and
TAKE pins of all phases are connected in a
cascaded manner (See Typical Application
circuit). The PASS pin of the last slave-phase is
connected back to the TAKE pin of the master
phase.
MCOT Operation-Master Phase
A master phase performs the
functions:
following
Accepts both write and read commands
through PMBus from a host
Generates the SET signal
Manages the start-up, shut-off, and all the
protections
Monitors fault alerts from the slave phases
through the PG pin
Generates the first ON pulse
Generates the ON pulse when receiving
RUN and SET signals
Dynamically adjusts its on-time to ensure
equal current sharing
MCOT Operation-Slave Phases
The master phase performs the following
functions:
Accepts write commands through PMBus
from a host
Receives the SET signal from a master
Sends an OV/UV/OT fault alert to a master
phase through the PG pin
Starts the ON pulse when receiving RUN
and SET signals
Dynamically adjusts its on-time to ensure
equal current sharing with its own phase
based on the per-phase and total current
Generates the PASS signal
Figure 1 illustrates MCOT operation. At t0, a
SET pulse is generated by the master phase
when (VFB+RAMP) drops below the reference
level (VCOMP). All the phases receive this SET
signal, but only the phase (the MASTER) that
has an active RUN signal will take action, so
the MASTER turns on the High-Side-FET (HSFET). Meanwhile, it generates a fixed widthpulse on the PASS pin, and passes it to the
TAKE pin of SLAVE1.
At t1, the falling edge of the TAKE pin of
SLAVE1 activates the RUN signal. This enables
the SLAVE1 to wait for the SET signal to turn
on its HS-FET.
At t2, the ON time of the PWM signal of the
MASTER phase expires and the HS-FET is
turned off. The ON time of the PWM signal is
fixed for any given input voltage, output voltage
and switching frequency. The ON time of each
phase is fine-tuned based on the per phase and
the total current to ensure equal current sharing
among phases.
At t3, the (VFB+RAMP) drops below the
reference level (VCOMP) in the MASTER
phase again, only SLAVE1 has an active RUN
signal, so it turns on its HS-FET. All other
phases ignore this SET signal. Meanwhile, the
SLAVE1 generates a pulse with fixed width on
the PASS pin, and passes it to the TAKE pin of
SLAVE2.
Generates the PASS signal
MPM3695-25 Rev. 1.01
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
The MPM3695-25 keeps above operation and
each phase turns on its HS-FET one by one for
a fixed ON time. The operation is similar to a
relay race and the RUN signal is like the baton.
The relay is carried on through the PASS/TAKE
loop. Only the phase that has the baton (RUN
signal) will turn on the HS-FET when the SET
signal is ready.
The MPM3695-25 benefits from MCOT control
to achieve extremely fast load transient
response. The SET signal is generated more
frequently during a load transient compared to
steady state (See Figure 2). Consequently,
energy is delivered to the load at a higher rate,
which minimizes the output deviation during a
load transient event. With the MPM3695-25, the
SET pulses are generated with a minimum
50ns interval, i.e., the next phase can be turned
on as fast as 50ns after the turn-on of the
previous phase.
RAMP Compensation
The MPM3695-25 guarantees stable operation
with zero-ESR ceramic output capacitors by
using internal RAMP compensation. A
triangular RAMP signal is generated internally
and is superimposed on the FB signal. The
triangular RAMP signal starts to rise once
RAMP+FB drops below the REF signal, and a
SET pulse is generated. The rise time of the
RAMP signal is fixed. The amplitude of the
RAMP compensation is selectable through the
PMBus command of D0h[3:1] to support wide
operation configurations. There is a trade-off
between the stability and load transient
response. A larger RAMP signal provides
higher stability but a slower load transient
response and vice versa. Consequently, it is
necessary to optimize the RAMP compensation
selection based on the design criteria for each
application.
MPM3695-25 Rev. 1.01
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
APPLICATION INFORMATION
Vo,min
Operation Mode Selection
The MPM3695-25 provides both forced CCM
and pulse skip operations in a light-load
condition. Four switching frequencies are
available for the MPM3695-25. The selection of
operation mode in a light-load condition and the
switching frequency is done through the PMBus.
Output Voltage Setting
A feedback resistor divider is required to set the
proper feedback gain. The values of the
feedback resistors are determined using
equation 1:
R 2 (k )
0.6
R1(k )
VO 0.6
(1)
where Vo is the output voltage. The output
voltage feedback gain is determined with
equation 2:
GFB
R2
R1 R 2
(2)
To optimize the load transient response, a feedforward capacitor (CFF) is required to be placed
in parallel with R1. Table 1 lists the values of
the feedback resistors and the feedforward
capacitor for common output voltages.
Table 1: Common Output Voltages
Vo
0.9
1.2
1.8
3.3
5
R1(kΩ)
0.5
1
2
4.53
7.32
R2(kΩ)
1
1
1
1
1
CFF(nF)
33
33
33
4.7
4.7
The MPM3695-25 offers output voltage
programmability through PMBus. In addition,
the output voltage can be adjusted within a
certain range through PMBus by adjusting the
internal reference voltage of the PMW controller
(VREF). The reference voltage, which has a
default value of 0.6V, can be adjusted between
0.5V to 0.672V. For a given feedback resistor
network, the upper and lower limits of the
output voltage are determined with equation 3a
and equation 3b:
Vo,max
0.672
GFB
0.5
GFB
(3b)
Two steps need to be followed to program the
output voltage through PMBus:
1. Write GFB value determined by Equation 2
to register VOUT_SCALE_LOOP (29h)
2. Write the output voltage command to
register VOUT_COMMAND (21h)
VREF is updated automatically based on the
output voltage command and GFB
Output voltage monitoring through PMBus is
enabled
by
setting
the
register
VOUT_SCALE_LOOP (29h) with a value that
matches the GFB calculated with Equation 2.
For applications where a PMBus interface is not
required, VREF=0.6V is used by default, and the
MPM3695-25 operates in analog mode. The
feedback resistors should be determined based
on Equation 1.
Soft Start
The soft start (SS) time can be programmed
through PMBus. The default SS time is 2ms.
Pre-Bias Start-Up
The MPM3695-25 is designed for monotonic
startup into pre-biased loads. If the output
voltage is pre-biased to a certain voltage during
startup, both the high-side and low-side
switches are disabled until the internal
reference voltage exceeds the sensed output
voltage at the FB pin.
Output Voltage Discharge
The output voltage discharge mode will be
enabled if the MPM3695-25 is disabled through
the CTRL pin. In such a case, both the highside and low-side switches are latched off. A
discharge FET connected between SW and
GND is turned on to discharge the output
capacitor. A typical on-resistance of the
discharge FET is 60Ω. Once the FB voltage
drops below 10% of the reference output
voltage, the discharge FET is turned off.
This feature can be enabled or disabled through
the MFR_CTRL_VOUT (D1h) command.
(3a)
MPM3695-25 Rev. 1.01
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
Current Sense and Over-Current Protection
(OCP)
The MPM3695-25 features on-die current
sense and a programmable positive current
limit threshold.
The MPM3695-25 provides both inductor valley
current limits (set by register D7h).
Inductor
(D7h)
Valley
Over-Current
Protection
During the LS-FET ON state, the inductor
current is sensed and monitored cycle-by-cycle.
The HS-FET will only be allowed to turn ON if
over-current is not detected during the LS-FET
ON-state. If there are 31 consecutive cycles of
an OC condition detected, OCP is triggered.
During an over-current condition or output
short-circuit condition, if the output voltage
drops below the under-voltage protection (UVP)
threshold, the MPM3695-25 enters OCP
immediately.
Once OCP is triggered, it either enters HICCUP
mode or latch-off mode, depending on the
register. It should be noted that a power-recycle
of the Vcc or CTRL is required to re-enable the
MPM3695-25 once it latches-off.
The inductor valley over-current limit can be
programmed through register D7h, which sets
the per-phase inductor valley current limit for
both single and multi-phase operation.
Negative Inductor Current limit
When the LS-FET detects a negative current
lower than the limit set through register D5h[2],
the part will turn off its LS-FET for a period of
time to limit the negative current. The period is
set through register D5h[3].
Under -Voltage Protection (UVP)
The MPM3695-25 monitors the output voltage
through the FB pin to detect an under-voltage
condition. If the FB voltage drops below the
UVP
threshold
(set
through
register
VOUT_UV_FAULT_LIMIT),
the
UVP
is
triggered. After UVP is triggered, the
MPM3695-25 enters either HICCUP or latch-off
mode, depending on the PMBus selection.
Please note that a power-recycle of the Vcc or
CTRL is required to re-enable the MPM3695-25
once it latches off.
Over-Voltage Protection (OVP)
The MPM3695-25 monitors the output voltage
using the FB pin connected to the tap of a
resistor divider to detect an over-voltage
condition. Please refer to the register
VOUT_OV_FAULT_RESPONSE section for
additional information on OVP.
Output Sinking Mode (OSM)
The MPM3695-25 enters the OSM when the
output voltage is more than 5% higher than the
reference and below the OVP threshold. Once
the OSM is triggered, the MPM3695-25 runs in
forced CCM. The MPM3695-25 exits OSM
mode when the HS-FET turns back on.
Over-Temperature Protection (OTP)
The MPM3695-25 monitors the junction
temperature. If the junction temperature
exceeds the threshold value (set by register
OT_FAULT_LIMIT), the converter enters either
HICCUP or latch-off mode depending on the
PMBus selection. Please note that a powerrecycle of the Vcc or CTRL is required to reenable the MPM3695-25 once it latches off.
Power Good (PG)
The MPM3695-25 has an open-drain powergood (PG) output. The PG pin can be
configured as an output only or input and output
pin by bit [0] of register MRF_CTRL_COMP
(D0h). For single-phase configuration, the PG
pin should be configured as output only. For
multi-phase operation, the PG pin should be
configured as an input and output pin to detect
faults from the slave phases. The PG pin must
be pulled high, to VCC or a voltage source, with
less than 3.6V through a pull-up resistor
(typically 100kΩ).
PG is pulled low initially once input voltage is
applied to the MPM3695-25. After the FB
voltage reaches the threshold set by register
POWER_GOOD_ON, the PG pin is pulled high
after
a
delay
set
by
the
register
MFR_CTRL_VOUT.
PG is latched low if any fault occurs, and the
relevant protection feature is triggered (e.g., UV,
OV, OT, UVLO, etc.). After the PG is latched
low, it cannot be pulled high again unless a new
soft-start
is
initialized.
MPM3695-25 Rev. 1.01
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MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
If the input supply fails to power the MPM369525, the PG is latched low. The relationship
between the PG voltage and the pull-up current
is shown in Figure 3.
Estimate the input voltage ripple using equation
6:
VIN
V
IOUT
V
OUT (1 OUT )
VIN
FSW CIN
VIN
(6)
The worst-case condition occurs at VIN = 2VOUT,
where:
VIN
IOUT
1
4 FSW C IN
(7)
Output Capacitor
The output capacitor maintains the DC output
voltage. Use ceramic capacitors or POSCAPs.
Estimate the output voltage ripple using
equation 8:
Figure 3: Power-Good Current vs. Power-Good
Voltage
Input Capacitor
The input current to a buck converter is
discontinuous, and therefore, requires a
capacitor to supply the AC current to the stepdown module while maintaining the DC input
voltage. Use ceramic capacitors for the best
performance. During layout, place the input
capacitors as close to the IN pin as possible.
The capacitance can vary significantly with
temperature. Use capacitors with X5R and X7R
ceramic dielectrics, because they are fairly
stable over a wide temperature range.
The capacitors must also have a ripple current
rating that exceeds the converter’s maximum
input ripple current. Estimate the input ripple
current using equation 4:
ICIN
VOUT
V
IOUT
(1 OUT )
VIN
VIN
(4)
VOUT
VOUT
V
1
)
(1 OUT ) (RESR
FSW L
VIN
8 FSW COUT
(8)
Where the module internal inductor is 0.36µH.
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
using equation 9:
VOUT
VOUT
2
8 FSW L COUT
(1
VOUT
)
VIN
(9)
The ESR dominates the switching-frequency
impedance for POSCAPs, so the output voltage
ripple is determined by the ESR value.
For simplification, the output ripple can be
approximated using equation 10:
VOUT
VOUT
V
(1 OUT ) R ESR
FSW L
VIN
(10)
The worst-case condition occurs at VIN = 2VOUT,
where:
I
(5)
ICIN OUT
2
For simplification, choose an input capacitor
with an RMS current rating that exceeds half
the maximum load current.
The input capacitance value determines the
converter input voltage ripple. Select a
capacitor value that meets any input voltage
ripple requirements.
MPM3695-25 Rev. 1.01
www.MonolithicPower.com
9/9/2019
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
25
MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
PCB Layout Guidelines
PCB layout plays an important role to achieve
stable operation. For optimal performance,
follow the guidelines below:
1. Place the input ceramic capacitors as close
to the VIN and PGND pins as possible on
the same layer of the MPM3695-25.
Maximize the VIN and PGND copper plane
to minimize the parasitic impedance.
2. Place VIN vias at least 1cm from the part to
minimize noise coupling from input
pulsating current.
3. Connect AGND to a solid ground plane
through a single point.
4. Place sufficient output GND vias close to
the GND pins to minimize both parasitic
impedance and thermal resistance.
5. Keep the ISUM trace as short as possible.
The ISUM trace should be away from the
VIN copper in a multi-phase configuration.
Vias should be avoided whenever possible.
6. The keep-out area must be kept clean.
Signal traces should avoid the area directly
beneath the SW pad unless a PGND layer is
used to provide shielding.
Figure 4. Example Layout - Top Layer
MPM3695-25 Rev. 1.01
www.MonolithicPower.com
9/9/2019
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
26
MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
TYPICAL APPLICATIONS
Figure 5: Typical Circuit VIN=12V, VOUT=1.8V at 20A Output
R3
10k
48
52,53
Vin
C1D
C1C
22uF
6.3V
22uF
6.3V
43
CTRL
44
PG
7
ALT#
SCL
SDA
C2
1uF
6.3V
38
39
42
40
41
CFF(nF)
33
33
33
4.7
4.7
8
TAKE
VIN
C1A
1uF
6.3V
R4
10k
R2(kΩ)
1
1
1
1
1
R1(kΩ)
0.5
1
2
4.53
7.32
Vo
0.9
1.2
1.8
3.3
5
BST
OUT
MPM3695-25
SW
CTRL
PG
VOSNS+
VCC
VOSNS-
VCC>
Vout
31-35
9-15,
58
5
R1
0.5k
R2
1k
4
C3
10nF
COUTA
COUTB
100uF
6.3V
100uF
6.3V
COUTC
220uF
6.3V
VDRV
ADDR
ALT
55
IREF
3
ISUM
56
RADDR
SCL
SDA
SET
49
PASS
47
PGND AGND
18-28,
36, 37,
50, 51,
59
2,6
Figure 6: Typical Circuit VCC= VIN =3.3V, VOUT =0.9V at 20A Output
MPM3695-25 Rev. 1.01
www.MonolithicPower.com
9/9/2019
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
27
MPM3695-25 – 16V, 20A, SCALABLE, DC/DC POWER MODULE WITH PMBUS
Figure 7: Multi Phase Typical Circuit VIN =12V, VOUT =1.8V at 40A Output
NOTE:
8) When VIN
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