Note that changing the VMAIN voltage setting changes

the GHON and VGL charge-pump output voltages. The

voltage range of VGL is limited to -15V. The voltage

range of GHON is limited to +35V. The voltage differ-

ence between GHON and VGL should not exceed +40V.

If VMAIN is set for more than +11V, disconnect the posi-

tive and negative charge pump with the negative linear

regulator controller by cutting the R29 and R28 traces.

Apply power to GHON and VGL by connecting external

power supplies to their respective pads.

Op-Amp Output Voltage (VOUT)

The MAX17103 EV kit’s op amp is configured internally

as a unity gain buffer. The voltage at the noninverting

input (POS) is set to half of VMAIN by voltage-divider

resistors R4 and R5. To set VOUT to other voltages (up

to VMAIN), select different divider resistors according

to the following equation:

R

VMAIN

VOUT

45

1

=×

−

⎛

⎝⎜

⎞

⎠⎟

R

MAX17103 Evaluation Kit

4

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