19-5665; Rev 0; 12/10
MAX15058 Evaluation Kit
General Description
The MAX15058 evaluation kit (EV kit) provides a proven
design to evaluate the MAX15058 high-efficiency, 3A,
step-down regulator with integrated switches. The EV
kit is preset for 1.8V output at load currents up to 3A
from a 2.8V 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.
S
All-Ceramic_Capacitor_Design
S
1MHz_Switching_Frequency
S
Output_Voltage_Range:_0.6V_Up_to_(0.94_x_V
IN
)
S
Enable_Input /Power-Good_Output
S
Selectable_Skip-Mode_Functionality
S
Proven_PCB_Layout
S
Fully_Assembled_and_Tested
Features
S
Operates_from_a_2.8V_to_5.5V_Input_Supply
Evaluates: MAX15058
Ordering Information
PART
MAX15058EVKIT+
TYPE
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
C1, C8
QTY
0
DESCRIPTION
Not installed, ceramic
capacitors (1206)
22FF
Q20%,
6.3V X5R ceramic
capacitors (1206)
Murata GRM31CR60J226K
TDK C3216X5R0J226M
1000pF
Q10%,
50V X7R
ceramic capacitors (0603)
TDK C1608X7R1H102K
Murata GRM188R71H102K
22000pF
Q10%,
50V X7R
ceramic capacitor (0603)
Murata GRM188R71H223K
TDK C1608X7R1H223K
Not installed, ceramic
capacitor (0603)
100pF
Q10%,
6.3V X7R ceramic
capacitor (0603)
TDK C1608X7R1H101K
DESIGNATION
JU1, JU3
JU2
QTY
2
1
DESCRIPTION
3-pin headers
2-pin header
1FH, 9A, 13.1mI inductor
(5.2mm x 5.5mm x 3mm)
Vishay IHLP2020CZER1R0M11
Vishay IHLP2020CZER1R0M01
ICE IN06142
(5mm x 5mm x 3mm, 5.8A)
8.06kI
Q1%
resistor (0603)
4.02kI
Q1%
resistor (0603)
5.36kI
Q1%
resistor (0603)
20kI
Q5%
resistor (0603)
1.2I
Q5%
resistor (0603)
1kI
Q5%
resistor (0603)
3A step-down regulator (9 WLP)
Maxim MAX15058EWL+
Shunts
PCB MAX15058 EVALUATION
KIT+
C2, C7,
C10
3
L1
1
C3, C6
2
R1
R2
R3
R4
R5
R6
U1
—
—
1
1
1
1
1
1
1
3
1
C4
1
C5
0
C9
1
________________________________________________________________ _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.
MAX15058 Evaluation Kit
Evaluates: MAX15058
Component Suppliers
SUPPLIER
Murata Electronics North America, Inc.
TDK Corp.
Vishay
PHONE
770-436-1300
847-803-6100
402-563-6866
WEBSITE
www.murata-northamerica.com
www.component.tdk.com
www.vishay.com
Note:
Indicate that you are using the MAX15058 when contacting these component suppliers.
Quick Start
• MAX15058 EV kit
Recommended Equipment
• 5V, 2A DC power supply
• Load capable of 3A
• 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 PGND
pad.
2) Connect the positive terminal of the 3A load to the
OUT pad and the negative terminal to the nearest
PGND pad.
3) Connect the digital voltmeter across the OUT pad
and the nearest PGND pad.
4) Verify that a shunt is installed on pins 1-2 of jumper
JU1.
5) Verify that a shunt is installed on pins 2-3 of jumper
JU3.
6) Turn on the DC power supply.
7) Enable the load.
8) Verify that the voltmeter displays 1.8V.
The device utilizes an adjustable soft-start function to
limit inrush current during startup. The soft-start time is
adjusted by the value of C4, the external capacitor from
SS/REFIN to GND. By default, C4 is currently 22000pF,
which gives a soft-start time of approximately 1.3ms. To
adjust the soft-start time, determine C4 using the follow-
ing formula:
C4 = (10FA x t
SS
)/0.6V
where t
SS
is the required soft-start time in seconds and
C4 is in farads. C4 should be a minimum 1nF capacitor
between SS/REFIN and GND.
When no external reference is applied at SS/REFIN,
the device uses the internal 0.6V reference.
The EV kit can be adjusted from 0.6V up to 0.94 x V
IN
by changing the values of resistors R1 and R2. To
determine the value of the resistor-divider, first select R1
between 2kI and 10kI and then use the following equa-
tion to calculate R2:
R2 = (V
FB
x R1)/(V
OUT
- V
FB
)
where V
FB
is equal to the reference voltage at
SS/REFIN and V
OUT
is the output. If no external refer-
ence is applied at SS/REFIN, the internal reference is
automatically selected and V
FB
becomes 0.6V. In the
case of V
OUT
= 0.6V, set R2 to 0I.
When R2 is changed, compensation components C5,
C6, and R3 must be recalculated to ensure loop stability
(refer to the
Compensation Design Guidelines
section in
the MAX15058 IC data sheet).
The IC features an enable input. For normal operation, a
shunt should be installed on pins 1-2 of jumper JU1. To
disable the output, install a shunt on pins 2-3 of JU1. See
Table 1 for JU1 shunt positions.
Reference Input and Soft-Start (SS/REFIN)
Procedure
Setting the Output Voltage
Detailed Description of Hardware
The MAX15058 EV kit provides a proven design to
evaluate the MAX15058 high-efficiency, 3A, step-down
regulator with integrated switches. The applications
include distributed power systems, portable devices,
and preregulators. The EV kit is preset for 1.8V out-
put at load currents up to 3A from a 2.8V 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.
Regulator Enable (EN)
2_ _ _______________________________________________________________________________________
MAX15058 Evaluation Kit
Table_1._Regulator_Enable_(EN)_Jumper_
JU1_Description
SHUNT_POSITION
1-2*
2-3
*Default
position.
DEVICE_OUTPUT
Enabled
Disabled
The device offers selectable skip-mode functionality to
reduce current consumption and achieve a higher effi-
ciency at light loads. To operate in skip mode, install a
shunt on jumper JU2. For normal operation, remove the
shunt from JU2. See Table 2 for JU2 shunt positions.
PGOOD is an open-drain output that deasserts when
V
FB
is above 555mV (typ), and asserts low if V
FB
is
below 533mV (typ). On the EV kit, the PGOOD PCB
pad is pulled up through resistor R4. The EV kit gives
the option to pull up PGOOD to the IN supply or a
user-supplied external voltage through configuration of
jumper JU3. See Table 3 for JU3 shunt positions.
Skip-Mode Input (SKIP)
Evaluates: MAX15058
Power Good (PGOOD)
Table_2._Skip-Mode_Input_(SKIP)_Jumper_
JU2_Description
SHUNT_POSITION
Installed
Not installed*
*Default
position.
SKIP_PIN
Connected to EN
Unconnected
MODE
Skip-mode
operation
Normal operation
Table_3._R4_Pullup_Reference_Jumper_JU3_
Description
SHUNT_POSITION
1-2
2-3*
*Default
position.
R4_PULLUP_REFERENCE
External user-supplied voltage
On-board IN supply
________________________________________________________________________________________ _ 3
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