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MAXM15064 5V Output
Evaluation Kit
Evaluates: MAXM15064 5V
Output-Voltage Application
General Description
The MAXM15064 5V output evaluation kit (EV kit) pro-
vides a proven design to evaluate the MAXM15064
high-voltage, high-efficiency, synchronous step-down
DC-DC module. The EV kit is programmed to deliver
5V output for loads up to 300mA. The EV kit features an
adjustable input undervoltage lockout, selectable mode,
and open-drain
RESET
signal. The MAXM15064 data
sheet provides a complete description of the module
that should be read in conjunction with this EV kit data
sheet prior to modifying the demo circuit. For full module
features, benefits and parameters, refer to the MAXM15064
data sheet.
Quick Start
Recommended Equipment
● One 4.5V to 60V DC, 300mA power supply
● 1.5W resistive load with 300mA sink capacity
● Four digital multimeters (DMM)
● MAXM15064EVKIT#
Equipment Setup and Test Procedure
The EV kit is fully assembled and tested. Follow the steps
below to verify the board operation.
Caution: Do not turn on power supply until all
connections are completed.
1)
2)
Set the power supply at a voltage between 4.5V and
60V. Then, disable the power supply.
Connect the positive terminal of the power supply to
the VIN PCB pad and the negative terminal to the
nearest GND PCB pad. Connect the positive termi-
nal of the 300mA load to the VOUT PCB pad and the
negative terminal to the nearest GND PCB pad.
Connect the DVM (DMM in voltage-measurement
mode) across the VOUT PCB pad and the nearest
GND PCB pad.
Verify that shunt is not installed on jumper J1
(see
Table 1
for details).
Turn on the DC power supply.
Enable the load.
Verify that the DVM displays 5V.
Features
● Highly Integrated Solution
● Wide 12V to 60V Input Range
●
Programmed 5V Output, Delivers Up To 300mA
Output Current
● High 78.68% Efficiency
(V
IN
= 48V, V
OUT
= 5V at 220mA)
● 500kHz Switching Frequency
● ENABLE/UVLO Input, Resistor-Programmable UVLO
Threshold
● PFM Feature for Better Light-Load Efficiency
● Fixed Internal 4.1ms Soft-Start Time
● RESET Output, with Pullup Resistor to V
CC
● Overcurrent and Overtemperature Protection
(OCP and OTP)
● Low-Profile, Surface-Mount Components
● Proven PCB Layout
● Fully Assembled and Tested
3)
4)
5)
6)
7)
Ordering Information
appears at end of data sheet.
319-100150; Rev 0; 2/18
MAXM15064 5V Output
Evaluation Kit
Detailed Description
Evaluates: MAXM15064 5V
Output-Voltage Application
For MAXM15064 to turn on at 12V input, the Resistor R2
is calculated to be 249kΩ.
The MAXM15064 EV kit is designed to demonstrate
salient features of MAXM15064 power module. The EV kit
includes an EN/UVLO PCB pad, and jumper J1, to enable
the output at a desired input voltage. Jumper J2 allows
selection of either PWM or PFM mode of operation based
on light-load performance requirements. An additional
RESET
pad is available for monitoring if the converter
output voltage is in regulation.
Input Capacitor Selection
Output Capacitor Selection
The input capacitor serves to reduce the current peaks
drawn from the input power supply and reduces switching
frequency ripple at the input. The input capacitance must
be greater than or equal to the value given in Table 1 of
MAXM15064
data sheet. Input capacitor C3 is chosen to
be 1µF/100V.
X7R ceramic output capacitors are preferred due to their
stability over temperature in industrial applications. The
required output capacitor (C5) for 5V output is selected
from Table 1 of the
MAXM15064
data sheet as 10µF/6.3V.
Hot-Plug-In and Long Input Cables
Adjusting Output Voltage
The MAXM15064 supports an adjustable output-voltage
range, from 0.9V to 5V, using a feedback resistive divider
from V
OUT
to FB. Output voltage can be programmed
using the values given in Table 1 of the
MAXM15064
data
sheet. For 5V output, R3 is chosen as 348kΩ, and R4 is
chosen as 75kΩ.
Enable/Undervoltage-Lockout (EN/UVLO)
Programming
The MAXM15064 offers an adjustable input undervoltage-
lockout feature. In this EV kit, for normal operation, leave
jumper J1 open. When J1 is left open, the MAXM15064
is enabled when the input voltage rises above 12V. To
disable MAXM15064, install a jumper across pins 2-3 on
J1. See
Table 1
for J1 settings. A potential divider formed
by R1 and R2 sets the input voltage (V
INU
) at which the
module is enabled. The value of resistor R1 is chosen
to be 2.2MΩ, and R2 is calculated using the following
equation:
R
2
=
( V
INU
−
1.215 )
R
1
×
1.215
The MAXM15064 EV kit PCB provides an optional
electrolytic capacitor (C2, 4.7µF/100V) to dampen input
voltage peaks and oscillations that can arise during hot-
plug-in and/or due to long input cables. This capacitor
limits the peak voltage at the input of the MAXM15064
power module, when the EV kit is powered directly from a
precharged capacitive source or an industrial backplane
PCB. Long input cables, between input power source and
the EV kit circuit can cause input-voltage oscillations due
to the inductance of the cables. The equivalent series
resistance (ESR) of the electrolytic capacitor helps damp
out the oscillations caused by long input cables. Further,
capacitor C1 (0.1µF/100V), placed near the input of the
board, helps in attenuating high frequency noise.
Mode of Operation
The MAXM15064 features PFM mode of operation to
increase the efficiency at light-load condition. If the MODE
pin is left unconnected during powerup, the module
operates in PFM mode at light loads. If the MODE pin is
connected to GND during power-up, the part operates in
constant-frequency PWM mode at all loads. See
Table 2
for J2 settings.
Internal LDO
where R1 and R2 are in kΩ,
An internal regulator provides a 5V nominal supply to
power the internal functions of the module. The output of
the linear regulator (V
CC
) should be bypassed with a 1µF
capacitor C4 to GND.
Table 1. UVLO Enable/Disable Configuration (J1)
POSITION
Not Installed*
1-2
2-3
*Default position
EN/UVLO PIN
Connected to the center node of resistor-divider
R1 and R2.
Connected to V
IN
Connected to GND
MAXM15064_ OUTPUT
Programmed to startup at desired input-voltage
level.
Enabled if V
IN
is greater than V
IN(MIN).
Disabled
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Maxim Integrated │
2
MAXM15064 5V Output
Evaluation Kit
Table 2. Mode of Operation (J2)
POSITION
1-2
Not Installed*
*Default position
Operates in PWM mode.
Evaluates: MAXM15064 5V
Output-Voltage Application
MODE PIN
Operates in PFM mode at light-load conditions.
EV Kit Performance Report
STARTUP THROUGH ENABLE
(V
IN
= 48V, V
OUT
= 5V, MODE = PWM, FULL LOAD)
toc01
100
5V/div
90
80
70
50V/div
2V/div
EFFICIENCY (%)
60
50
40
30
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 5V, MODE = PWM)
toc02
EN/UVLO
LX
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
V
IN
= 48V
V
IN
= 60V
V
OUT
RESET
1ms/div
5V/div
20
10
0
0
30
60
90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 5V, MODE = PFM)
100
90
80
EFFICIENCY (%)
toc03
OUTPUT VOLTAGE vs. LOAD CURRENT
(V
OUT
= 5V, MODE = PWM)
5.076
5.070
OUTPUT VOLTAGE (V)
5.064
5.058
5.052
5.046
5.040
V
IN
= 48V
V
IN
= 60V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
toc04
70
60
50
40
30
20
10
0
1
10
LOAD CURRENT (mA)
100
V
IN
= 12V
V
IN
= 36V
V
IN
= 24V
V
IN
= 60V
V
IN
= 48V
0
30
60
90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
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Maxim Integrated │
3
MAXM15064 5V Output
Evaluation Kit
EV Kit Performance Report (continued)
Evaluates: MAXM15064 5V
Output-Voltage Application
OUTPUT VOLTAGE vs. LOAD CURRENT
(V
OUT
= 5V, MODE = PFM)
5.225
5.200
5.175
OUTPUT VOLTAGE (V)
5.150
5.125
5.100
5.075
5.050
5.025
5.000
0
30
60
V
IN
= 12V
OUTPUT VOLTAGE vs. INPUT VOLTAGE
V
OUT
= 5V, PWM MODE
5.10
5.09
OUTPUT VOLTAGE (V)
5.08
5.06
5.05
5.04
5.03
I
OUT
= 0A
I
OUT
= 200mA
I
OUT
= 100mA
I
OUT
= 300mA
toc06
toc05
V
IN
= 24V
V
IN
= 48V
V
IN
= 36V V = 60V
IN
90 120 150 180 210 240 270 300
LOAD CURRENT (mA)
0
20
40
INPUT VOLTAGE(V)
60
80
OUTPUT-VOLTAGE RIPPLE
(V
IN
= 48V, V
OUT
= 5V, FULL LOAD, MODE = PWM)
toc07
LOAD TRANSIENT RESPONSE
(V
IN
= 48V, V
OUT
= 5V, MODE = PFM)
(LOAD CURRENT STEPPED FROM 5mA TO 150mA)
toc08
V
OUT
(AC)
V
OUT
(AC)
10mV/div
100mV/div
I
OUT
100mA/div
100µs/div
2µs/div
LOAD TRANSIENT RESPONSE
(V
IN
= 48V, V
OUT
= 5V, MODE = PWM)
(LOAD CURRENT STEPPED FROM 150mA TO 300mA)
toc09
BODE PLOT
(V
IN
= 48V, V
OUT
= 5V, MODE = PWM, FULL LOAD)
80
60
toc10
90
60
PHASE MARGIN (°)
V
OUT
(AC)
50mV/div
40
GAIN (dB)
20
0
-20
-40
GAIN
PHASE
30
0
-30
I
OUT
100µs/div
100mA/div
-60
-80
1k
CROSSOVER FREQUENCY = 31.57kHz
PHASE MARGIN = 52.617
°
10k
FREQUENCY (Hz)
-60
-90
100k
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MAXM15064 5V Output
Evaluation Kit
Ordering Information
PART
MAXM15064EVKIT#
#Denotes RoHS compliant.
TYPE
EV Kit
Evaluates: MAXM15064 5V
Output-Voltage Application
Component Suppliers
SUPPLIER
Murata Americas
NEC TOKIN America, Inc.
Panasonic Corp.
SANYO Electric Co., Ltd.
TDK Corp.
TOKO America, Inc.
WEBSITE
www.murata.com
www.nec-tokinamerica.com
www.panasonic.com
www.sanyodevice.com
www.component.tdk.com
www.tokoam.com
Note:
Indicate that you are using the MAXM15064 when
contacting these component suppliers.
MAXM15064 5V EV Kit Bill of Materials
ITEM QTY DESIGNATION
1
1 C1
2
1 C2
3
1 C3
4
1 C4
5
1 C5
6
1 C6
7
1 R1
8
1 R2
9
1 R3
10
1 R4
11
1 R5
12
1 U1
Description
0.1µF±10%,100V, X7R ceramic capacitor (0603)
4.7µF±20%,100V, Aluminimum Capacitor
1µF±10%,100V, X7R ceramic capacitor (1206)
1µF±10%,16V, X7R ceramic capacitor (0603)
10µF±10%,6.3V, X7R ceramic capacitor (1206)
OPEN
2.2MΩ ±1% resistor (0402)
249kΩ ±1% resistor (0402)
348kΩ ±1% resistor (0402)
75kΩ ±1% resistor (0402)
100kΩ ±1% resistor (0402)
MAXM15064, 10-pin micro-SLIC Power Module
Manufacturer Partnumber-1
TDK CC0603KRX7R0BB104
NICHICON UUR2A4R7MCL6GS
MURATA GRM31CR72A105KA01L
MURATA GRM188R71C105KA12
MURATA GRM31CR70J106K
N/A
VISHAY DALE CRCW04022M20FK
VISHAY DALE CRCW0402249KFK
VISHAY DALE CRCW0402348KFK
VISHAY DALE CRCW040275K0FK
VISHAY DALE CRCW0402100KFK
MAXIM MAXM15064AMB+T
Manufacturer Partnumber-2
TDK C3216X7R2A105K160
TDK C1608X7R1C105K
YAGEO RC0402FR-07100KL
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