19-4647; Rev 0; 5/09
MAX17083 Evaluation Kit
General Description
The MAX17083 evaluation kit (EV kit) is a fully assem-
bled and tested PCB that demonstrates the typical 5A
application circuit of the MAX17083. The MAX17083 is a
DC-DC converter that steps down the system’s 3.3V or
5V input supply for low-voltage, low-power applications.
The MAX17083 EV kit provides a 1.1V output voltage from
a 2.4V to 5.5V input range. It delivers up to 5A output cur-
rent while achieving greater than 90% efficiency.
Programmed through jumper JU4, the EV kit operates at
1MHz switching frequency and has superior line- and
load-transient response. The EV kit also allows the evalua-
tion of other adjustable output voltages from 0.75V to
2.7V, by varying the SET pin and changing resistors R3
and R4.
Features
o
2.4V to 5.5V Input Range
o
Configured for 1.1V Output Voltage
o
Adjustable Output-Voltage Range (0.75V to 2.7V)
o
o
o
o
o
o
o
o
o
5A Output Current
90% Efficiency (V
IN
= 3.3V, V
OUT
= 1.1V at 2A)
1MHz Switching Frequency
Pin-Selectable Four-Level Switching Frequency
(500kHz, 750kHz, 1MHz, and 1.5MHz)
Enable Input
Power-Good Output Indicator (POK)
Low-Profile Surface-Mount Components
Lead(Pb)-Free and RoHS Compliant
Fully Assembled and Tested
Evaluates: MAX17083
Ordering Information
PART
MAX17083EVKIT+
TYPE
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION QTY
DESCRIPTION
10µF ±10%, 10V X5R ceramic
capacitors (0805)
Murata GRM21BR61A106K
TDK C2012X5R0J106M
1µF ±10%, 6.3V X7R ceramic
capacitors (0402)
Murata GRM155R61A105K
TDK C1005X5R0J105M
0.1µF ±10%, 16V X7R ceramic
capacitors (0402)
TDK C1005X5R1C104K
Murata GRM155R71C104K
Not installed, POSCAP (D Case)
0.1µF ±10%, 50V X7R ceramic
capacitor (1206)
Murata GRM319R71H104K
TDK C3216X7R1H104K
Not installed, ceramic capacitor (0402)
220µF, 6m
Ω
, 2V ESR POSCAP
(D Case)
SANYO 2TPF220M6
Panasonic EEFSD0E221R (7m
Ω
, 2.5V)
DESIGNATION QTY
D1
EN, POK
JU1, JU2
JU3, JU4
1
2
2
2
Test points
2-pin headers
4-pin headers
1.0µH, 6.8A, 14.2mΩ inductor
(5.8mm x 6.2mm x 3.0mm)
TOKO FDV0530-1R0M
NEC TOKIN MPLC0525L1R0
100kΩ ±5% resistor (0603)
1kΩ ±5% resistor (0603)
0Ω resistor (0402)
Not installed, resistors (0402);
R4 is open; R9 is short (PCB trace)
5A step-down regulator
(24 TQFN)
Maxim MAX17083ETG+
Shunts
PCB: MAX17083 EVALUATION KIT+
DESCRIPTION
Green surface-mount LED (0805)
C1, C2
2
C3, C5
2
L1
1
R1
R2
R3
R4, R9
1
1
1
0
C4, C6
2
C7
1
C8
0
U1
—
—
1
4
1
C9
0
C20
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.
MAX17083 Evaluation Kit
Evaluates: MAX17083
Component Suppliers
SUPPLIER
Murata Electronics North America, Inc.
NEC TOKIN America, Inc.
Panasonic Corp.
SANYO Electric Co., Ltd.
TDK Corp.
TOKO America, Inc.
PHONE
770-436-1300
408-324-1790
800-344-2112
619-661-6835
847-803-6100
847-297-0070
WEBSITE
www.murata-northamerica.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 MAX17083 when contacting these component suppliers.
Quick Start
Recommended Equipment
•
•
•
•
•
2.4V to 5.5V DC power supply (VIN)
5V DC power supply (VCC)
Dummy load capable of sinking 5A
Digital multimeter (DMM)
100MHz dual-trace oscilloscope
Detailed Description of Hardware
Jumper Settings
Several jumper settings in the following tables illustrate
some features of the MAX17083 EV kit.
Procedure
The MAX17083 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed.
1) Ensure that the circuit is connected correctly to the
supplies and dummy load prior to applying any
power.
2) Verify that shunts are not installed across JU1 and
JU4 (1MHz).
3) Verify that a shunt is installed across JU2
(enabled).
4) Verify that a shunt is installed across JU3, pins 1-2
(V
OUT
= 1.1V).
5) Enable the power supplies (VIN and VCC).
6) Observe the 1.1V output with the DMM and/or oscil-
loscope. Look at the LX switching node while vary-
ing the load current.
VCC Bias Supply
The MAX17083 EV kit can be configured to operate
from a single DC power supply through configuration of
jumper JU1. When a shunt is installed across JU1, VCC
is powered from the VIN input through R9. When a
shunt is not installed, the user must provide an addi-
tional power supply at the VCC pad. Table 1 lists the
selectable jumper options.
Enable Input
The MAX17083 EV kit features a 2-pin jumper (JU2) that
selects the shutdown control input. Table 2 lists the
selectable jumper options.
Table 1. Jumper JU1 Functions
JUMPER
POSITION
Installed
Not installed*
VCC PIN
Connected to VIN
through R9
User-provided power at
VCC and PGND pads
VIN/VCC RANGE
VIN = 4.5 to 5.5V;
VCC = VIN
VIN = 2.4 to 5.5V;
VCC = 4.5 to 5.5V
*Default
position.
Table 2. Jumper JU2 Functions
JUMPER
POSITION
Installed*
Not installed
EN PIN
Connected to VCC
Pulled low through R1
REGULATOR
OUTPUT
Enabled
Disabled
*Default
position.
2
_______________________________________________________________________________________
MAX17083 Evaluation Kit
FB Threshold Selection
Jumper JU3 selects one of the four preset feedback
voltage levels. The EV kit’s feedback regulation voltage
is set according to Table 3.
Switching Frequency Selection (FREQ)
The MAX17083 EV kit features a 4-pin jumper (JU4) that
selects PWM-mode switching frequency. Switching-fre-
quency selection is set according to Table 4. Refer to the
MAX17083 IC data sheet for different external compo-
nents when operating at different switching frequencies.
Table 3. Jumper JU3 Functions
JUMPER
POSITION
1-2*
1-3
1-4
Not installed
SET PIN
REF
VCC
GND
OPEN
FB REGULATION
VOLTAGE (V)
1.1
1.8
0.75
1.5
Evaluates: MAX17083
*Default
position.
Setting V
OUT
with a Resistive
Voltage-Divider at FB
The MAX17083 produces an adjustable 0.75V to 2.7V
output voltage by connecting FB to a resistive divider.
To obtain an output voltage other than 1.1V, replace R3
and install resistor R4 with values according to the fol-
lowing equation:
R3
⎞
⎛
V
OUT
=
V
FB
⎜
1
+
⎟
⎝
R4
⎠
where V
FB
= 0.75V. Note that jumper JU3 must be set
to pins 1-4 (SET = GND) for V
FB
= 0.75V. Component
changes are required for output voltages greater than
2V. Refer to the MAX17083 IC data sheet for more infor-
mation.
Table 4. Jumper JU4 Functions
JUMPER
POSITION
1-2
1-3
1-4
Not installed*
FREQ PIN
REF
VCC
GND
Open
FREQUENCY
750kHz
1.5MHz
500kHz
1MHz
*Default
position.
_______________________________________________________________________________________
3
MAX17083 Evaluation Kit
Evaluates: MAX17083
Figure 1. MAX17083 EV Kit Schematic
4
_______________________________________________________________________________________
MAX17083 Evaluation Kit
Evaluates: MAX17083
Figure 2. MAX17083 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX17083 EV Kit PCB Layout—Component Side
_______________________________________________________________________________________
5
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