19-4949; Rev 0; 9/09
MAX15041 Evaluation Kit
General Description
The MAX15041 evaluation kit (EV kit) is a fully assembled
and tested circuit board that evaluates the MAX15041
synchronous buck converter IC with integrated high-side
and low-side switches. The EV kit output is configured
to 3.3V and delivers up to 3A output current. The EV kit
circuit operates at the MAX15041 internally set 350kHz
switching frequency and features PCB pads to monitor
the IC power-good output signal (PGOOD) and to enable
the circuit.
The MAX15041 EV kit requires a 4.5V to 28V power
supply that provides up to 3A for normal operation.
S
4.5V to 28V Input-Voltage Range
S
3.3V at 3A Output
S
Fixed 350kHz Switching Frequency
S
Evaluates Internal 170mI R
DS-ON
High-Side and
Features
Evaluates: MAX15041
105mI R
DS-ON
Low-Side Power Switches
S
High Efficiency Up to 93%
S
Enable Input (EN)
S
Power-Good Output (PGOOD)
S
Overcurrent and Thermal-Shutdown Protection
S
Fully Assembled and Tested
Ordering Information
PART
MAX15041EVKIT+
TYPE
EV Kit
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION QTY
DESCRIPTION
47FF
Q20%,
35V electrolytic ceram-
ic capacitor (6.3mm x 5.8mm)
Panasonic EEEFK1V470P
1FF
Q10%,
16V X5R ceramic
capacitor (0603)
Murata GRM188R61C105K
0.1FF
Q10%,
50V X7R ceramic
capacitor (0603)
Murata GRM188R71H104K
0.01FF
Q10%,
50V X7R ceramic
capacitors (0603)
Murata GRM188R71H103K
22FF
Q10%,
6.3V X5R ceramic
capacitor (1206)
Murata GRM31CR60J226K
Not installed, ceramic capacitor
(1206)
100pF
Q5%,
50V C0G ceramic
capacitor (0603)
Murata GRM1885CIH101J
12000pF
Q10%,
16V X7R ceramic
capacitor (0603)
Murata GRM188R71C123K
DESIGNATION QTY
C10
0
DESCRIPTION
Not installed, ceramic capacitor
(0603)
150mA, 75V diode (SOD323)
Diodes, Inc. 1N4148WS-7-F
(Top Mark: T4 or T6)
3-pin header
4.7FH, 6.4A inductor
Sumida CDRH105RNP-4R7N
10kI
Q1%
resistors (0603)
1.8kI
Q1%
resistor (0603)
45.3kI
Q1%
resistor (0603)
Not installed, resistor (0603)
47I
Q5%
resistor (0603)
Internal switch buck converter
(16 TQFN-EP*)
Maxim MAX15041ETE+
(Top Mark: AGV)
Shunt (JU1)
PCB: MAX15041 EVALUATION KIT+
C1
1
D1
JU1
L1
R1, R2, R6
R3
R5
R7
R8
1
1
1
3
1
1
0
1
C2
1
C3
1
C4, C7
2
C5
1
U1
1
C6
0
—
1
C8
1
—
1
*EP
= Exposed pad.
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.
MAX15041 Evaluation Kit
Evaluates: MAX15041
Component Suppliers
SUPPLIER
Diodes, Inc.
Murata North America Electronics, Inc.
Panasonic Corp.
Sumida Corp.
PHONE
805-446-4800
770-436-1300
800-344-2112
847-545-6700
WEBSITE
www.diodes.com
www.murata-northamerica.com
www.panasonic.com
www.sumida.com
Note:
Indicate that you are using the MAX15041 when contacting these component suppliers.
Quick Start
•
•
•
28V adjustable, 3A power supply
Detailed Description of Hardware
The MAX15041 EV kit circuit uses a MAX15041 step-
down converter IC to implement a step-down DC-DC
converter circuit. The MAX15041 IC is available in a
16-pin TQFN surface-mount package and features a
fixed 350kHz switching frequency and internal low
R
DS-ON
MOSFETs to achieve high efficiency and lower
overall system cost. The MAX15041 EV kit operates over
a wide input-voltage range of 4.5V to 28V.
The MAX15041 EV kit is configured to 3.3V using resis-
tors R5 and R6 and delivers up to 3A of output current.
The EV kit circuit soft-start startup time is set to 1.2ms
using capacitor C7. The EV kit also provides a PGOOD
PCB pad to monitor the IC power-good output signal
and an EN PCB pad to enable/disable the EV kit VOUT
output.
The MAX15041 EV kit VOUT output is optimized to
provide up to 3A when operating with an input-voltage
source of 4.5V to 28V applied at the VIN and PGND pads.
Refer to the TOC 19, 20, and 21 curves in the
Typical
Operating Characterisitc
section in the MAX15041 IC
data sheet for current deration for different EV kit VIN
inputs and VOUT outputs .
The MAX15041 EV kit step-down converter output volt-
age is configured to 3.3V by resistors R5 and R6. The EV
kit’s output voltage (VOUT) can be reconfigured in the
0.606V to 0.9 x VIN range by replacing resistors R5 and
R6. Use the following equation to reconfigure the output
voltage to the desired value:
V
OUT
R5
=
R6
×
−
1
0.606
where V
OUT
is the desired output voltage, R6 is 10kI
(typ), and R5 is in kilohms.
Required Equipment
Electronic load capable of sinking up to 3A
(e.g., HP 6060B)
Two digital voltmeters (DVMs)
The MAX15041 EV kit is fully assembled and test-
ed. Follow the steps below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed.
1)
2)
Verify that a shunt is installed across pins 1-2 of
jumper JU1. (EV kit enabled)
Connect the power-supply positive and ground
terminals to the VIN and PGND PCB pads, respec-
tively.
Connect the positive and negative terminal of the
electronic load to the VOUT and PGND PCB pads,
respectively.
Connect a DVM across the VOUT and PGND PCB
pads.
Connect a DVM across the PGOOD and SGND PCB
pads.
Turn on the power supply.
Set the power-supply voltage to 12V.
Enable the 3A electronic load.
Verify that the voltmeter connected to VOUT
measures 3.3V.
Procedure
Input Power Source
3)
4)
5)
6)
7)
8)
9)
Configuring the Output Voltage (VOUT)
10) Verify that the voltmeter connected to PGOOD mea-
sures approximately 5V.
2
______________________________________________________________________________________
MAX15041 Evaluation Kit
Evaluates: MAX15041
Reconfiguring the MAX15041 EV kit for a new output
voltage may require replacing inductor L1, capacitors
C1 and/or C5, and compensation components C8, C9,
and R3. The minimum output voltage is also impacted
by minimum controllable on time of the MAX15041 IC.
To select a new value for inductor L1, and capacitors C1
and C5, refer to the
Inductor Selection, Input Capacitor
Selection,
and
Output-Capacitor Selection
sections,
respectively, in the MAX15041 IC data sheet.
Jumper JU1 configures the MAX15041 EV kit output for
turn-on/turn-off control. Install a shunt across pins 1-2 to
enable VOUT or across pins 2-3 to disable VOUT. VOUT
can also be enabled by applying an external signal
greater than 1.95V (typ) at the EN and SGND PCB pads.
See Table 1 for proper JU1 configuration.
The MAX15041 EV kit provides a PCB pad to monitor
the status of the power-good output (PGOOD). PGOOD
can be used as a system reset signal during power-up.
PGOOD is high after VOUT rises above 92.5% of its pro-
grammed output voltage. PGOOD is pulled up to VDD
(5V, typ) using resistor R2. PGOOD is pulled low when
VOUT drops below 90% of its nominal set voltage.
The MAX15041 EV kit circuit soft-start time is set to
1.2ms using capacitor C7. To reconfigure the EV kit for
other soft-start times, refer to the
Setting the Soft-Start
Time
section in the MAX15041 IC data sheet.
The MAX15041 IC provides the flexibility of externally
compensating its internal error amplifier to achieve
stability for various applications. The MAX15041 EV kit
circuit is compensated by appropriately choosing values
for resistors R3 and capacitors C8 and C9. To reconfig-
ure the compensation network for specific requirements,
refer to the
Compensation Design Guidelines
section in
the MAX15041 IC data sheet.
Power-Good Output (PGOOD)
Enable Control (JU1)
Soft-Start Timing Input (SS)
Compensation Network
Table 1. Enable Control (JU1)
SHUNT
POSITION
1-2
2-3
EN PIN
Connected to VIN
through R1
Connected to
GND
Externally con-
trolled
EV KIT
FUNCTION
VOUT enabled
VOUT disabled
Voltage source
applied at EN and
SGND PCB pads
Not installed
_______________________________________________________________________________________
3
MAX15041 Evaluation Kit
Evaluates: MAX15041
Figure 1. MAX15041 EV Kit Schematic
4
______________________________________________________________________________________
MAX15041 Evaluation Kit
Evaluates: MAX15041
1.0”
1.0”
Figure 2. MAX15041 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX15041 EV Kit PCB Layout—Component Side
1.0”
Figure 4. MAX15041 EV Kit PCB Layout—PGND Layer 2
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