MAXM17504 5V Output
Evaluation Kit
General Description
The MAXM17504 evaluation kit (EV kit) is a demonstration
circuit of the MAXM17504 high-voltage, high-efficiency, current-mode scheme, synchronous step-down
DC-DC switching power module. The MAXM17504
EV kit is designed for 5V output and delivers up to
3.5A load current from a wide input voltage range of
11V to 60V. The EV kit switches at an optimal 500kHz
switching frequency to allow the use of small component
sizes that help minimize solution size while maintaining
high performance. The EV kit provides a precisionenable input, an open-drain RESET output signal, and
external frequency synchronization to provide a simple and
reliable startup sequence and eliminate beat frequency
between regulators. The EV kit also includes optional component footprints to program different output
voltages, an adjustable input undervoltage-lockout, and a
soft-start time to control inrush current during startup. The
MAXM17504 data sheet provides a complete description
of the part that should be read in conjunction with this
evaluation kit data sheet prior to modifying the demo
circuit.
Evaluates: MAXM17504 in 5V
Output-Voltage Application
Features
●● Highly Integrated Solution with Integrated Shield
Inductor
●● Wide 11V to 60V Input Range
●● Preset 5V Output with a Fixed Resistor-Divider on
Feedback Pin (FB)
●● Programmable Output Voltage Feature (0.9V to 12V)
●● Up to 3.5A Output Current
●● High 92.5% Efficiency (VIN = 12V, VOUT = 5V at 1.0A)
●● 500kHz Switching Frequency
●● Enable/UVLO Input, Resistor-Programmable UVLO
Threshold
●● Adjustable Soft-Start Time
●● Selectable PWM, PFM, or DCM Mode
●● Open-Drain RESET Output
●● External Frequency Synchronization
●● Overcurrent and Overtemperature Protection
●● Low-Profile, Surface-Mount Components
●● Lead(Pb)-Free and RoHS Compliant
●● Fully Assembled and Tested
Ordering Information appears at end of data sheet.
19-7590; Rev 0; 4/15
MAXM17504 5V Output
Evaluation Kit
Quick Start
Recommended Equipment
●● MAXM17504 evaluation kit
●● 11V to 60V DC power supply (VIN)
●● Dummy load capable of sinking 3.5A
●● Digital voltmeter (DVM)
●● 100MHz dual-trace oscilloscope
Procedure
Evaluates: MAXM17504 in 5V
Output-Voltage Application
also available for monitoring output-voltage regulation to
enable/disable the application circuit of the load.
Soft-Start Input (SS)
The device utilizes an adjustable soft-start function to
limit inrush current during startup. The soft-start time is
programmed by the value of C1, the external capacitor
from SS to GND. The selected output capacitance (CSEL)
and the output voltage (VOUT) determine the minimum
value of C1, as shown by the following equation:
C1 ≥ 28 × 10 −3 × C SEL × VOUT
The MAXM17504 EV kit is fully assembled and tested.
Please follow the steps below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed.
where C1 is in nF and CSEL is in µF.
1) Set the power supply at a voltage between 11V and
60V. Disable the power supply.
t SS = C1/ 5.55
The soft-start time (tSS) is calculated by the equation below:
2) Connect the positive and negative terminals of the
power supply to IN and PGND PCB pads, respectively.
where tSS is in ms and C1 is in nF.
3) Connect the positive and negative terminals of the
3.5A load to OUT and PGND2 PCB pads, respectively,
and set the load to 0A.
The EV kit offers an adjustable input undervoltage-lockout
level by resistor-dividers connecting between the IN, EN/
UVLO, and GND pins. For normal operation, a shunt
should not be installed across pins 1-2 on JU1 to enable
the output through an internal pullup 3.3MΩ resistor from
EN/UVLO pin to IN pin. To disable the output, install the
shunt across pins 1-2 on JU1 to pull the EN/UVLO pin
to GND. See Table 1 for JU1 setting details. The EV kit
also provides an optional R3 PCB footprint to program a
UVLO threshold voltage at which an input voltage level
device turns on. The R3 resistor can be calculated by the
following equation:
4) Connect the DVM across the OUT PCB pad and the
PGND2 PCB pad.
5) Verify that no shunts are installed across pins 1-2 on
jumper JU1 to enable UVLO (see Table 1 for details).
6) Verify that a shunt is installed across JU3 to disable
the external synchronization (see Table 3 for details).
7) Verify that a shunt is installed across JU2 to enable
PWM mode (see Table 2 for details).
Programmable Undervoltage-Lockout (UVLO)
8) Enable the input power supply.
R3 =
9) Verify the DVM display 5V.
10) Increase the load up to 3.5A to verify the DVM
continue displaying 5V.
Detailed Description of Hardware
The MAXM17504 EV kit is a proven circuit to demonstrate
the high-voltage, high-efficiency, and compact solution
size of the synchronous step-down DC-DC power module. The output voltage is preset to 5V to operate from
11V to 60V and provides up to 3.5A load current. The
optimal frequency is set at 500kHz to maximize
efficiency and minimize component size. The EV kit includes
jumper JU1 to enable/disable UVLO of the device, JU2 to
configure in PWM, PFM, or DCM mode in advance of
light-load efficiency, and JU3 to enable/disable external
clock synchronize (SYNC). The RESET PCB pad is
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4009.5
(VINU − 1.215)
where VINU is the input voltage at which the device is
required to turn on, and R3 unit is in kΩ.
Table 1. UVLO Enable/Disable
Configuration (JU1)
SHUNT
POSITION
EN PIN
MAXM17504_
OUTPUT
Installed
Connected to GND
Disable
Connected to VIN
Enable
Not installed*
*Default position.
Maxim Integrated │ 2
Evaluates: MAXM17504 in 5V
Output-Voltage Application
MAXM17504 5V Output
Evaluation Kit
MODE Selection (MODE)
The device’s MODE pin can be used to select among
PWM, PFM, or DCM modes of operation in advance of
constant frequency or high-efficiency at light-load. The
logic state of the MODE pin is latched when the VCC
and EN/UVLO voltage exceed the respective UVLO rising
thresholds and all internal voltages are ready to allow LX
switching. The changes on the MODE pin are ignored
during normal operation. Refer to the MAXM17504
data sheet for more information on the PWM, PFM, and
DCM modes of operation. Table 2 shows EV kit jumper
settings that can be used to configure the desired mode of
operation.
amplitude should be greater than 50ns and 2.1V, respectively. The minimum external clock low-pulse width should
be greater than 160ns, and the maximum external clock
low-pulse amplitude should be less than 0.8V. Table 3
describes the connection of the SYNC pin.
Setting VOUT with a Resistive
Voltage Divider at FB
External Clock Synchronization (SYNC)
The internal oscillator of the device can be synchronized
to an external clock signal to eliminate beat frequency
between regulators through the SYNC pin. The external
synchronization clock frequency must be between 1.1fSW
to 1.4fSW, where fSW is the frequency of operation set
by R5. The minimum external clock high-pulse width and
The MAXM17504 EV kit is preset for 5V and offers an
adjustable output voltage range from as low as 0.9V up
to 12V at 3.5A maximum load. The adjustable output
voltage can be programmed by the set of resistor dividers
R1 and R2. Refer to Table 1 (Selection Component Values)
in the MAXM17504 data sheet to select optimal component
values for each specific input voltage range from 4.5V
up to 60V and an output voltage from 0.9V up to 12V.
To obtain an output voltage other than the default setting
outputs in Table 1, only seven component (R1, R2, C1,
C2, C3, C4, and C8) values are needed to modify the
equation described in the Setting the Output Voltage
section of the MAXM17504 data sheet.
Table 2. MODE Description (JU2)
Table 3. SYNC Description (JU3)
SHUNT
POSITION
MODE PIN
MAXM17504 MODE
Not installed
Unconnected
PFM mode of operation
1-2
Connected to VCC
DCM mode of operation
2-3*
Connected to GND
*Default position.
PWM mode of operation
SHUNT
POSITION
SYNC PIN
MAXM17504_SYNC
1-2*
Connected to
SGND
SYNC feature unused
Not installed
Connected to test
loop on PCB
Frequency can be
synchronized with an
external clock
*Default position.
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Maxim Integrated │ 3
Evaluates: MAXM17504 in 5V
Output-Voltage Application
MAXM17504 5V Output
Evaluation Kit
Typical Operating Characteristics (continued)
(VIN = 11V - 60V, VOUT = 5V, IOUT = 0 – 3.5A, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 5V, PFM MODE
toc01
100
100
90
80
70
VIN = 12V,
fSW = 500kHz
60
VIN = 36V,
fSW = 500kHz
VIN = 48V,
fSW = 500kHz
VIN = 24V,
fSW = 500kHz
50
EFFICIENCY (%)
EFFICIENCY (%)
90
40
80
VIN = 12V,
fSW = 500kHz
60
VIN = 36V,
fSW = 500kHz
50
MODE = SGND
MODE = OPEN
0
1000
2000
40
3000
0
1000
2000
3000
OUTPUT CURRENT (mA)
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 5V, DCM MODE
toc03
100
LOAD AND LINE REGULATION
VOUT = 5V, PFM MODE
toc04
5.5
5.4
90
VIN = 12V,
fSW = 500kHz
5.3
80
VIN =12V,
fSW = 500kHz
70
VIN = 48V,
fSW = 500kHz
60
5.2
VIN = 24V,
fSW = 500kHz
VOUT (V)
EFFICIENCY (%)
VIN = 24V,
VIN = 48V,
fSW = 500kHz
fSW = 500kHz
70
OUTPUT CURRENT (mA)
VIN = 36V,
fSW = 500kHz
5.1
5
4.8
4.6
1000
2000
4.5
3000
OUTPUT CURRENT (mA)
VIN = 48V,
fSW = 500kHz
VIN = 24V,
fSW = 500kHz
4.7
MODE = VCC
0
VIN = 36V,
fSW = 500kHz
4.9
50
40
EFFICIENCY vs. OUTPUT CURRENT
VOUT = 5V, PWM MODE
toc02
MODE = OPEN
0
1000
2000
3000
OUTPUT CURRENT (mA)
LOAD AND REGULATION
VOUT = 5V, PWM MODE
5.5
toc05
5.4
VIN = 12V,
fSW = 500kHz
5.3
VOUT (V)
5.2
VIN = 36V,
fSW = 500kHz
5.1
5
4.9
4.8
VIN = 48V,
fSW = 500kHz
VIN = 24V,
fSW = 500kHz
4.7
4.6
4.5
MODE = SGND
0
1000
2000
3000
OUTPUT CURRENT (mA)
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Maxim Integrated │ 4
Evaluates: MAXM17504 in 5V
Output-Voltage Application
MAXM17504 5V Output
Evaluation Kit
Typical Operating Characteristics
(VIN = 11V - 60V, VOUT = 5V, IOUT = 0 – 3.5A, TA = +25°C, unless otherwise noted.)
LOAD AND LINE REGULATION
VOUT = 5V, DCM MODE
LOAD CURRENT TRANSIENT RESPONSE
VIN = 24V, VOUT = 5V, IOUT = 0.05A - 1.75A,
MODE = OPEN
toc07
toc6
5.5
5.4
5.3
VOUT (V)
5.1
200mV/div
(AC
COUPLED)
VOUT
VIN = 48V,
fSW = 500kHz
VIN = 24V,
fSW = 500kHz
5.2
5
4.9
4.8
VIN = 12V,
fSW = 500kHz
4.7
4.6
4.5
2A/div
IOUT
VIN = 36V,
fSW = 500kHz
MODE = VCC
0
1000
2000
200µs/div
3000
OUTPUT CURRENT (mA)
LOAD CURRENT TRANSIENT RESPONSE
VIN = 24V, VOUT = 5V, IOUT = 0.05A - 1.75A,
MODE = VCC
toc09
LOAD CURRENT TRANSIENT RESPONSE
VIN = 24V, VOUT = 5V, IOUT = 0.05A-1.75A,
toc08
MODE = SGND
200mV/div
(AC
COUPLED)
VOUT
200mV/div
(AC
COUPLED)
2A/div
IOUT
2A/div
IOUT
200µs/div
200µs/div
LOAD CURRENT TRANSIENT RESPONSE
VIN = 24V, VOUT = 5V, IOUT = 1.75A - 3.5A,
MODE = SGND
toc10
CLOSED-LOOP BODE PLOT
VIN = 24V, VOUT = 5V, IOUT = 3.5A,
MODE = SGND
toc11
50
40
GAIN (dB)
200mV/div
(AC
COUPLED)
VOUT
PHASE
30
2A/div
60
30
0
0
GAIN
-10
-30
-60
CROSSOVER
FREQUENCY = 43kHz
PHASE MARGIN = 72.8◦
-30
-50
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90
10
-40
200µs/div
120
20
-20
IOUT
150
1k
10k
PHASE MARGIN (°)
VOUT
-90
-120
100k
-150
1Meg
FREQUENCY (Hz)
Maxim Integrated │ 5
MAXM17504 5V Output
Evaluation Kit
Evaluates: MAXM17504 in 5V
Output-Voltage Application
Component Suppliers
SUPPLIER
WEBSITE
Murata Americas
www.murata.com
NEC TOKIN America, Inc.
www.nec-tokinamerica.com
Panasonic Corp.
www.panasonic.com
SANYO Electric Co., Ltd.
www.sanyodevice.com
TDK Corp.
www.component.tdk.com
TOKO America, Inc.
www.tokoam.com
Note: Indicate that you are using the MAXM17504 when contacting these component suppliers.
Component List and Schematic
Refer to the following files attached to this data sheet for
component information and schematic:
●● MAXM17504EV_BOM.xls
●● MAXM17504_EV_Schematic.pdf
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Maxim Integrated │ 6
MAXM17504 5V Output
Evaluation Kit
Figure 1. MAXM17504 EV Kit Component Placement Guide—
Component Side
Evaluates: MAXM17504 in 5V
Output-Voltage Application
Figure 2. MAXM17504 EV Kit Component Placement Guide—
Solder Side
Figure 3. MAXM17504 EV Kit PCB Layout—Component Side
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Maxim Integrated │ 7
MAXM17504 5V Output
Evaluation Kit
Figure 4. MAXM17504 EV Kit PCB Layout—PGND Layer 2
Evaluates: MAXM17504 in 5V
Output-Voltage Application
Figure 5. MAXM17504 EV Kit PCB Layout—PGND Layer 3
Figure 6. MAXM17504 EV Kit PCB Layout—Solder Side
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Maxim Integrated │ 8
Evaluates: MAXM17504 in 5V
Output-Voltage Application
MAXM17504 5V Output
Evaluation Kit
Ordering Information
PART
TYPE
MAXM17504EVKIT#
EV Kit
#Denotes RoHS compliant.
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Maxim Integrated │ 9
Evaluates: MAXM17504 in 5V
Output-Voltage Application
MAXM17504 5V Output
Evaluation Kit
Revision History
REVISION
NUMBER
REVISION
DATE
0
4/15
DESCRIPTION
Initial release
PAGES
CHANGED
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