with low operating current. The EV kit operates over a
wide 6V to 36V input range and the output is set for 5V
at 3.5A.
The EV kit comes with the MAX17245ETESA+ installed.
Features
●
●
●
●
●
●
●
●
●
●
Wide 6V to 36V Input Supply Range
Forced-PWM or Skip-Mode Operation
Configurable Switching Frequency
Current-Mode Controller with Force-PWM and Skip
Modes
84% Peak Efficiency at 12V Input in Skip-Mode
88% Peak Efficiency at 12V Input in Forced-PWM
FSYNC Input and Power-Good Output
Proven 4-Layer 2oz Copper PCB Layout
Demonstrates 1065mil x 795mil Solution Size
Fully Assembled and Tested
Table 1. EN Configuration (JU1)
SHUNT
POSITION
1-2*
2-3
DESCRIPTION
Connects the EN pin to the voltage at SUP
for normal operation.
Connects the EN pin to ground to enter
shutdown mode.
*Default position.
Table 2. Mode of Operation (JU2)
SHUNT
POSITION
1-2*
2-3
Not installed
*Default position.
MODE PIN
Connected to BIAS
Connected to
AGND
Connected to an
external clock
MODE
Forced-PWM mode
Skip mode
Forced-PWM mode
(device syncs to an
external clock)
Quick Start
Required Equipment
● MAX17245 EV kit
● 14V, 3A DC power supply
● Electronic load capable of 3.5A
● Digital voltmeter (DVM)
Procedure
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation.
Caution: Do not turn on
supplies until all connections are completed.
1) Verify that jumpers JU1 and JU2 are in their default
positions, as shown in
Table 1
and
Table 2.
2) Connect the power supply between the EXT_VBAT
and nearest PGND banana jacks.
3) Connect the 3.5A electronic load between the OUT
and nearest PGND banana jacks.
4) Connect the DVM between the OUT and nearest
PGND banana jacks.
Ordering Information
appears at end of data sheet.
19-8509; Rev 0; 3/16
MAX17245 Evaluation Kit
Evaluates: MAX17245
Detailed Description of Hardware
Setting the Switching Frequency (FOSC)
The EV kit demonstrates the MAX17245 high-voltage,
high-frequency, step-down converter with low operating
current. The EV kit operates over a wide 6V to 36V input
range and the output is set for 5V at 3.5A.
The EV kit switching frequency is set by a resistor, R
FOSC
(R2), connected from F
OSC
to AGND. Refer to
Figure 3
of
the MAX17245 IC data sheet for a graphical approach of
selecting the correct R
FOSC
(R2) value.
Enable (EN)
Power-Good Output (PGOOD)
Place a shunt in the 1-2 position on jumper JU1 for normal
operation. To place the device into shutdown mode, move
the shunt on JU1 to the 2-3 position.
Synchronization Input (FSYNC)
The EV kit features jumper JU2 to control the synchronization
input (FSYNC). Connect FSYNC to AGND to enable skip-
mode operation. Connect to BIAS or to an external clock to
enable fixed-frequency forced-PWM mode operation.
The device can be synchronized to an external signal
applied to FSYNC. To use an external clock, uninstall
the shunt on JU2 and apply the signal at the FSYNC test
point. The external clock frequency at FSYNC can be
higher or lower than the internal clock by 20%. Ensure
that the duty cycle of the external clock used has a minimum
100ns pulse width.
The EV kit provides a PGOOD test point to monitor the
status of the device output. PGOOD asserts when V
OUT
rises above 95% of its regulation voltage. PGOOD
deasserts when V
OUT
drops below 92% of its regulation
voltage.
Output
Connect FB to BIAS for a fixed +5V (EV kit default output)
output voltage. To set the output to other voltages between
1V and 10V, remove R12 and connect a resistive divider
from output (OUT) to FB to AGND. Use the following formula
to determine the R4 and R6 of the resistive-divider network:
V
R4
=
OUT
−
1
R6
×
V
FB
where V
FB
= 1V.
Synchronizing Output (SYNCOUT)
The EV kit provides a test point EXT_5V to pull up
the open-drain SYNCOUT to an external 5V supply.
SYNCOUT is a 180° out-of-phase clock output relative to
the internal oscillator at SYNCOUT to create cascaded
power supplies with multiple MAX17245s.
www.maximintegrated.com
Maxim Integrated
│
2
MAX17245 Evaluation Kit
Evaluates: MAX17245
Component Suppliers
SUPPLIER
Murata Americas
NXP Semiconductors
Panasonic Corp.
Samsung Electro-mechanics
Taiyo Yuden
www.murata.com
www.nxp.com
www.panasonic.com
www.samsungsem.com
www.taiyo-yuden.com
WEBSITE
Würth Electronik GmbH & Co. KG
www.we-online.com
Note:
Indicate that you are using the MAX17245 when contacting these component suppliers.
Component Information, PCB Layout,
and Schematics
●
MAX17245 EV BOM
●
MAX17245 EV PCB Layout
●
MAX17245 EV Schematic
●
MAX17245 EV Minimal Component Schematic
Ordering Information
PART
MAX17245EVKIT#
#Denotes RoHS compliant.
TYPE
EV Kit
See the following links for component information, PCB
layout diagams, and schematics.
www.maximintegrated.com
Maxim Integrated
│
3
MAX17245 Evaluation Kit
Evaluates: MAX17245
Revision History
REVISION
NUMBER
0
REVISION
DATE
3/16
Initial release
DESCRIPTION
PAGES
CHANGED
—
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
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