MAX17083EVKIT [MAXIM]
5A Output Current;
| 型号： | MAX17083EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 5A Output Current |
| 文件： | 总7页 (文件大小：186K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4647; Rev 0; 5/09
MAX17083 Evaluation Kit
Evluates:MAX17083
General Description
Features
o 2.4V to 5.5V Input Range
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.
o Configured for 1.1V Output Voltage
o Adjustable Output-Voltage Range (0.75V to 2.7V)
o 5A Output Current
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.
o 90% Efficiency (V = 3.3V, V
= 1.1V at 2A)
IN
OUT
o 1MHz Switching Frequency
o Pin-Selectable Four-Level Switching Frequency
(500kHz, 750kHz, 1MHz, and 1.5MHz)
o Enable Input
o Power-Good Output Indicator (POK)
o Low-Profile Surface-Mount Components
o Lead(Pb)-Free and RoHS Compliant
o Fully Assembled and Tested
Ordering Information
PART
TYPE
MAX17083EVKIT+
EV Kit
+Denotes lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION QTY
DESCRIPTION
Green surface-mount LED (0805)
Test points
DESIGNATION QTY
DESCRIPTION
D1
1
2
2
2
10µF 10%, 10V X5R ceramic
capacitors (0805)
Murata GRM21BR61A106K
TDK C2012X5R0J106M
EN, POK
JU1, JU2
JU3, JU4
C1, C2
C3, C5
2
2
2-pin headers
4-pin headers
1µF 10%, 6.3V X7R ceramic
capacitors (0402)
Murata GRM155R61A105K
TDK C1005X5R0J105M
1.0µH, 6.8A, 14.2mΩ inductor
(5.8mm x 6.2mm x 3.0mm)
TOKO FDV0530-1R0M
L1
1
NEC TOKIN MPLC0525L1R0
0.1µF 10%, 16V X7R ceramic
capacitors (0402)
TDK C1005X5R1C104K
Murata GRM155R71C104K
R1
R2
R3
1
1
1
100kΩ 5% resistor (0603)
1kΩ 5% resistor (0603)
0Ω resistor (0402)
C4, C6
C7
2
1
0
0
1
Not installed, POSCAP (D Case)
Not installed, resistors (0402);
R4 is open; R9 is short (PCB trace)
R4, R9
0
0.1µF 10%, 50V X7R ceramic
capacitor (1206)
Murata GRM319R71H104K
TDK C3216X7R1H104K
5A step-down regulator
(24 TQFN)
Maxim MAX17083ETG+
C8
U1
1
—
—
4
1
Shunts
C9
Not installed, ceramic capacitor (0402)
PCB: MAX17083 EVALUATION KIT+
220µF, 6mΩ, 2V ESR POSCAP
(D Case)
SANYO 2TPF220M6
C20
Panasonic EEFSD0E221R (7mΩ, 2.5V)
________________________________________________________________ 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
Component Suppliers
SUPPLIER
Murata Electronics North America, Inc.
NEC TOKIN America, Inc.
Panasonic Corp.
PHONE
WEBSITE
770-436-1300
408-324-1790
800-344-2112
619-661-6835
847-803-6100
847-297-0070
www.murata-northamerica.com
www.nec-tokinamerica.com
www.panasonic.com
SANYO Electric Co., Ltd.
TDK Corp.
www.sanyodevice.com
www.component.tdk.com
www.tokoam.com
TOKO America, Inc.
Note: Indicate that you are using the MAX17083 when contacting these component suppliers.
Quick Start
Detailed Description of Hardware
Recommended Equipment
Jumper Settings
Several jumper settings in the following tables illustrate
some features of the MAX17083 EV kit.
•
•
•
•
•
2.4V to 5.5V DC power supply (VIN)
5V DC power supply (VCC)
Dummy load capable of sinking 5A
Digital multimeter (DMM)
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.
Evluates:MAX17083
100MHz dual-trace oscilloscope
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.
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.
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).
Table 1. Jumper JU1 Functions
3) Verify that a shunt is installed across JU2
(enabled).
JUMPER
POSITION
VCC PIN
VIN/VCC RANGE
4) Verify that a shunt is installed across JU3, pins 1-2
Connected to VIN
through R9
VIN = 4.5 to 5.5V;
VCC = VIN
(V
OUT
= 1.1V).
Installed
5) Enable the power supplies (VIN and VCC).
User-provided power at
VCC and PGND pads
VIN = 2.4 to 5.5V;
VCC = 4.5 to 5.5V
Not installed*
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.
*Default position.
Table 2. Jumper JU2 Functions
JUMPER
POSITION
REGULATOR
OUTPUT
EN PIN
Installed*
Connected to VCC
Enabled
Disabled
Not installed
Pulled low through R1
*Default position.
2
_______________________________________________________________________________________
MAX17083 Evaluation Kit
Evluates:MAX17083
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.
Table 3. Jumper JU3 Functions
JUMPER
FB REGULATION
VOLTAGE (V)
SET PIN
POSITION
1-2*
1-3
REF
VCC
1.1
1.8
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.
1-4
GND
OPEN
0.75
1.5
Not installed
*Default position.
Setting V
with a Resistive
OUT
Table 4. Jumper JU4 Functions
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:
JUMPER
POSITION
FREQ PIN
FREQUENCY
1-2
1-3
REF
VCC
GND
Open
750kHz
1.5MHz
500kHz
1MHz
1-4
R3
R4
⎛
⎞
Not installed*
V
= V
1+
⎜
⎝
⎟
⎠
OUT
FB
*Default position.
where V = 0.75V. Note that jumper JU3 must be set
FB
to pins 1-4 (SET = GND) for V = 0.75V. Component
FB
changes are required for output voltages greater than
2V. Refer to the MAX17083 IC data sheet for more infor-
mation.
_______________________________________________________________________________________
3
MAX17083 Evaluation Kit
Evluates:MAX17083
Figure 1. MAX17083 EV Kit Schematic
4
_______________________________________________________________________________________
MAX17083 Evaluation Kit
Evluates:MAX17083
Figure 2. MAX17083 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX17083 EV Kit PCB Layout—Component Side
_______________________________________________________________________________________
5
MAX17083 Evaluation Kit
Evluates:MAX17083
Figure 4. MAX17083 EV Kit PCB Layout—PGND Layer 2
Figure 5. MAX17083 EV Kit PCB Layout—PGND Layer 3
6
_______________________________________________________________________________________
MAX17083 Evaluation Kit
Evluates:MAX17083
Figure 6. MAX17083 EV Kit PCB Layout—Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7
© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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