MAX8727EVKIT Maxim Integrated Products, MAX8727EVKIT Datasheet - Page 2

• Manufacturer Part Number: MAX8727EVKIT
• Description: Display Modules & Development Tools MAX8727 KIT MAX8727 KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX8727EVKIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

• 2.6V to 5.5V, 5A DC power supply (VIN)
• Voltmeter
The MAX8727 EV kit is fully assembled and tested.
Follow these steps to verify board operation. Do not
turn on the power supply until all connections are
completed:
1) Verify that there is no shunt placed across jumper
2) Connect the positive terminal of the DC power supply
3) Connect the voltmeter across the VOUT and GND
4) Turn on the 2.6V to 5.5V DC power supply and verify
The MAX8727 EV kit contains a high-efficiency, PWM
step-up DC-DC converter. The MAX8727 features a
programmable soft-start, loop compensation pin, and
an internal MOSFET switch. The EV kit operates from a
2.6V to 5.5V DC power supply, provides a regulated
15V output, and is capable of providing a 600mA load
current with a 4.5V input. The EV kit is configured for a
5V input, a 15V output, and a 1.2MHz switching fre-
quency. Operation at a different input voltage, out-
put voltage, or switching frequency may require a
different inductor, output capacitor, and compensa-
tion components. Refer to the MAX8727 data sheet for
detailed information on loop compensation and compo-
nent selection.
The EV kit features a shutdown mode that reduces the
MAX8727 quiescent current. JU1 selects the shutdown
mode. See Table 1 for jumper JU1 functions.
The MAX8727 EV kit provides the option to configure
the switching frequency of the step-up DC-DC convert-
er. Table 2 lists jumper JU2 settings for configuring the
switching frequency. The EV kit is configured and
shipped to operate at 1.2MHz. For operation at 640kHz,
cut the trace between pins 1 and 2 of jumper JU2 and
short pins 2 and 3. Refer to the MAX8727 data sheet for
selecting the proper components.
MAX8727 Evaluation Kit
2
JU1 to enable the MAX8727.
to the VIN pad. Connect the negative terminal of the
DC power supply to the GND pad above the VIN pad.
pads.
that the output is 15V.
_______________________________________________________________________________________
Switching-Frequency Selection (FREQ)
Recommended Equipment
Detailed Description
Shutdown Mode (
Jumper Selection
Quick Start
SHDN )
The EV kit is configured to provide a 15V output voltage.
However, the output voltage can be adjusted from V
24V by selecting appropriate R1 and R2 values. Select
R2 in the 10kΩ to 50kΩ range. R1 is then given by:
where V
points, the EV kit may require a different inductor and
component changes. Refer to the MAX8727 data sheet
for proper component selection.
Table 1. Jumper JU1 Functions
Table 2. Jumper JU2 Functions
Not installed
1-2 (default)
LOCATION
LOCATION
Installed
(default)
SHUNT
SHUNT
2-3
FB
= 1.24V. For significantly different operation
Connected to GND (cut the
Connected to GND
R
Connected to VIN
before shorting pins 2-3)
1
trace between pins 1-2
Connected to VIN with
=
through R4
SHDN PIN
R
2
FREQ PIN
a PC trace
×







VOUT
V
Evaluating Other
FB
Output Voltages

 −

Shutdown mode,
V
MAX8727 enabled,
V
1
OUT
OUT
MAX8727 OUTPUT




= V
= 15V
FREQUENCY
SWITCHING
IN
1.2MHz
640kHz
- V
DIODE
IN
to