MAX17115 Evaluation Kit
Evaluates: MAX17115
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Quick Start
Recommended Equipment
• +4.5Vto+5.5VDCpowersupply
• Voltmeter
Procedure
The MAX17115 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) Verify that all jumpers are in their default positions
(see the Jumper Selection section).
2) Connect the positive terminal of the power supply
to the VIN pad. Connect the negative terminal of the
power supply to the PGND pad.
3) Turn on the power supply and verify that the step-up
switching regulator output (VMAIN) is +16V.
4) Verify that the LDO linear regulator output (VREF_O)
is approximately +15V.
5) Verify that the gate-on supply (VGON) is approxi-
mately +30V.
6) Verify that the gate-off supply (VGOFF) is approxi-
mately -6.8V.
7) Verify that the buffer amplifier (OPO) is approximately
+6.4V.
Detailed Description of Hardware
The MAX17115 EV kit contains a high-performance step-
up regulator, a high-accuracy, high-voltage low-dropout
(LDO) linear regulator, a positive single-stage charge
pump, a negative single-stage charge pump with a
shunt voltage regulator, and a high-performance buffer
amplifier. The EV kit operates from a DC power supply
between +4.5V and +5.5V.
Although the MAX17115 IC has a +2.5V to +5.5V input
supply range, the EV kit is optimized to operate from
a DC supply voltage of +4.5V to +5.5V. The step-up
switching regulator is configured for a +16V output pro-
viding at least 500mA. The high-accuracy, high-voltage
LDO linear regulator is configured for a +15V output
providing at least 20mA. The gate-on (VGON) supply
voltage is configured for a +30V output providing at
least 20mA. The gate-off (VGOFF) supply voltage is
configured for a -6.8V output providing at least 20mA.
The high-performance buffer amplifier is configured for
a +6.4V output providing a 200mA output short-circuit
current.
Step-Up Regulator Output-Voltage
Selection (VMAIN)
The output voltage of the main step-up regulator is set
by connecting a resistive voltage-divider from the output
(VMAIN) to AGND with the center tap connected to FB.
Select R14 in the 10kI to 50kI range. Calculate R13
with the following equation:
VMAIN
FB
V
R13 R14 1
V
= × −
where V
FB
, the step-up regulator’s feedback set point,
is 1.24V.
High-Voltage LDO Linear Regulator
Output-Voltage Selection (VREF_O)
The output voltage of the high-accuracy LDO linear
regulator is set by connecting a resistive voltage-divider
from the output (VREF_O) to AGND with the center tap
connected to VREF_FB. Select R10 in the 10kI to 50kI
range. Calculate R9 with the following equation:
VREF_0
VREF_FB
V
R9 R10 1
V
= × −
where V
VREF_FB
, the LDO linear regulator’s feedback set
point, is 1.24V.
Buffer Amplifier Output-Voltage Selection (OPO)
The output voltage of the buffer amplifier is set by
connecting a resistive voltage-divider from the output
(VMAIN) to AGND with the center tap connected to OPI.
Calculate R1 with the following equation:
VMAIN
OPI
V
R1 R2 1
V
= × −
where V
OPI
, the buffer amplifier’s noninverting input,
equals the desired buffer output (OPO).
