19-5267; Rev 0; 5/10
MAX15050 Evaluation Kit
General Description
The MAX15050 evaluation kit (EV kit) provides a proven
design to evaluate the MAX15050 high-efficiency, 4A,
step-down regulator with integrated switches. The EV kit
is preset for 1.8V output at load currents up to 4A from
a 2.9V to 5.5V input supply. The IC features a 1MHz
fixed switching frequency, which allows the EV kit to
achieve an all-ceramic capacitor design and fast tran-
sient responses.
The EV kit PCB comes with a MAX15050EWE+ installed.
S
All-Ceramic Capacitor Design
S
1MHz Switching Frequency
S
Output Voltage Range from 0.6V to (0.9 x V
IN
)
S
Proven PCB Layout
S
Fully Assembled and Tested
Features
S
Operates from 2.9V to 5.5V Input Supply
Evaluates: MAX15050
Ordering Information
PART
MAX15050EVKIT+
TYPE
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
C1, C4
QTY
2
DESCRIPTION
22FF
Q10%,
10V X7R ceramic
capacitors (1206)
Murata GRM31CR71A226K
0.1FF
Q10%,
50V X7R ceramic
capacitors (0603)
Murata GRM188R71H104K
TDK C1608X7R1H104K
Not installed, capacitor (0805)
Not Installed, capacitor (1206)
820pF
Q10%,
50V X7R ceramic
capacitor (0603)
Murata GRM188R71H821K
33pF
Q5%,
50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H330J
680pF
Q10%,
50V X7R ceramic
capacitor (0603)
Murata GRM188R71H681K
2.2FF
Q10%,
10V X7R ceramic
capacitor (0603)
Murata GRM188R71A225K
DESIGNATION
C11
C12
JU1
L1
R1
R2
R3
R4
R5
R6
R8
U1
—
—
QTY
1
0
1
1
1
1
1
1
1
1
0
1
1
1
DESCRIPTION
0.033FF
Q10%,
25V X7R ceramic
capacitor (0603)
Murata GRM188R71E333K
Not installed, capacitor (0603)
2-pin header
0.47FH, 16A inductor
Würth 744312047
8.06kI
Q1%
resistor (0603)
4.02kI
Q1%
resistor (0603)
6.19kI
Q1%
resistor (0603)
20kI
Q5%
resistor (0603)
48.7I
Q1%
resistor (0603)
100kI
Q5%
resistor (0603)
Not installed, resistor (0603)
Synchronous buck regulator
(16 WLP)
Maxim MAX15050EWE+
Shunt
PCB: MAX15050 EVALUATION
KIT+
C2, C6
2
C3
C5
C7
0
0
1
C8
1
C9
1
C10
1
Component Suppliers
SUPPLIER
Murata Electronics North America, Inc.
TDK Corp.
PHONE
770-436-1300
847-803-6100
WEBSITE
www.murata-northamerica.com
www.component.tdk.com
Würth Electronik GmbH & Co. KG
201-785-8800
www.we-online.com
Note:
Indicate that you are using the MAX15050 when contacting these component suppliers.
_______________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX15050 Evaluation Kit
Evaluates: MAX15050
Quick Start
• MAX15050 EV kit
where t
SS
is the required soft-start time in seconds and
C11 is in farads. C11 should be a 1nF (min) capacitor
between REFIN/SS and GND.
When no external reference is applied at REFIN/SS, the
device uses the internal 0.6V reference.
The EV kit can be adjusted from 0.6V to (0.9 x V
IN
) by
changing the values of R1 and R2. To determine the
value of the resistor-divider, first select R1 between 2kI
to 10kI, then use the following equation to calculate R2:
R2 = (V
FB
x R1)/(V
OUT
- V
FB
)
where V
FB
is equal to the reference voltage at
REFIN/SS and V
OUT
is the output. If no external refer-
ence is applied at REFIN/SS, the internal reference is
automatically selected and V
FB
becomes 0.6V. In this
case, R2 is not needed for V
OUT
= 0.6V.
When R2 is changed, compensation components C7,
C8, C9, R3, and R5 must be recalculated to ensure loop
stability (refer to the
Compensation Design
section in the
MAX15050/MAX15051 IC data sheet).
To shut down the converter, install a shunt on jumper
JU1. For normal operation, remove the shunt from JU1.
See Table 1 to configure JU1.
Recommended Equipment
• 5V, 4A DC power supply
• Load capable of 4A
• Digital voltmeter
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) Connect the positive terminal of the 5V supply to the
IN pad and the negative terminal to the nearest GND
pad.
2) Connect the positive terminal of the 4A load to the
OUT pad and the negative terminal to the nearest
GND pad.
3) Connect the digital voltmeter across the OUT pad
and the nearest GND pad.
4) Verify that a shunt is not installed on jumper JU1.
5) Turn on the DC power supply.
6) Enable the load.
7) Verify that the voltmeter displays 1.8V.
Setting Output Voltage
Procedure
Regulator Enable (EN)
Detailed Description of Hardware
The MAX15050 EV kit provides a proven design to
evaluate the MAX15050 high-efficiency, 4A, step-down
regulator with integrated switches. The applications
include server, point-of-load, ASIC/CPU/DSP, base
stations, telecom and networking, and RAID control
power supplies. The EV kit is preset for 1.8V output at
load currents up to 4A from a 2.9V to 5.5V input supply.
The IC features a 1MHz fixed switching frequency, which
allows the EV kit to achieve an all-ceramic capacitor
design and fast transient responses.
The IC utilizes an adjustable soft-start function to limit
inrush current during startup. The soft-start time is
adjusted by C11, the external capacitor from REFIN/SS
to GND. By default, C11 is 0.033FF, which gives a soft-
start time of approximately 2.5ms. To adjust the soft-start
time, determine C11 using the following equation:
C11 = (8µA x t
SS
)/0.6V
PWRGD is an open-drain output that goes high
impedance when V
FB
is above 92.5% x V
REFIN/SS
and
V
REFIN/SS
is above 0.54V. PWRGD becomes low when
V
FB
is below 90% of V
REFIN/SS
for at least 48 clock cycles
or V
REFIN/SS
is below 0.54V. PWRGD also becomes low
during shutdown. On the EV kit, the PWRGD PCB pad is
pulled up to VDD through resistor R4. Use the GND PCB
pad as a ground reference for this signal.
Power Good (PWRGD)
Table 1. Regulator Enable (EN) Jumper
JU1 Description
SHUNT POSITION
Installed
Not installed*
*Default
position.
DESCRIPTION
Disables the IC
Normal operation
Reference Input and Soft-Start (REFIN/SS)
2
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