MAX17014 Evaluation Kit

4

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logic-high, both the OUT and the VGOFF outputs are

enabled. Removing the shunt disables the OUT and the

VGOFF outputs. Refer to the

Power-Up Sequence sec-

tion in the MAX17014 IC data sheet for a more detailed

description of the OUT and VGOFF power-up sequence.

Table 4 lists the selectable JU3 jumper options.

Step-Up and Positive Charge-Pump

Regulator Enable Input (EN2)

The MAX17014 EV kit features a jumper (JU4) to control

the step-up and positive charge-pump regulator enable

input (EN2). By default, a shunt is installed across JU4

to provide EN2 logic-high. When EN2 and EN1 are

logic-high, both the AVDD and the VGON outputs are

enabled. EN2 is inactive when EN1 is low. Refer to the

Power-Up Sequence section in the MAX17014 IC data

sheet for a more detailed description of the AVDD and

VGON power-up sequence. Table 4 lists the selectable

JU4 jumper options.

High-Voltage Switch Control Input (CTL)

Jumper JU5 configures the setting to control the high-

voltage switch control pin (CTL) of the MAX17014 IC.

Switches between the SRC and GON pins and the

GON and DRN pins can also be controlled by an exter-

nal logic controller connected to the CTL pad. See

Table 5 for switch states and refer to the

High-Voltage

Switch Control section in the MAX17014 IC data sheet

for further information about the high-voltage switches

connected to the GON pin.

VGON Discharge Path

The MAX17014 EV kit features a method to configure

the VGON discharge path using resistor R15 and

jumper JU6. When CTL is low, GON may be connected

to DRN, allowing VGON to discharge through resistor

R15. JU6 selects the discharge path by connecting

R15 to AVDD (through diode D6) or to PGND. Table 6

lists the selectable JU6 jumper options.

Output Voltage Selection

Step-Down Switching-Regulator

Output Voltage (OUT)

The MAX17014 EV kit’s step-down switching regulator

supports both fixed and adjustable output voltages. By

default, the EV kit’s step-down regulator’s output (OUT)

is set to the +3.3V fixed mode by connecting FB2 to

GND through resistor R19. For adjustable mode

(+1.25V to +5V), select R18 and R19 to set the desired

step-down regulator output voltage. Refer to the

Detailed Description, Step-Down Regulator section in

the MAX17014 IC data sheet for instructions on select-

ing resistors R18 and R19.

SHUNT POSITION

JU3

JU4

STEP-DOWN AND NEGATIVE

CHARGE-PUMP REGULATOR

STEP-UP AND POSITIVE

CHARGE-PUMP REGULATOR

Installed*

Installed*

Enabled

Enabled

Installed

Not installed

Enabled

Disabled

Not installed

X

Disabled

Disabled

Table 4. Jumpers JU3 and JU4 Functions

*

Default position.

X = Don’t care.

SHUNT POSITION

CTL PIN CONNECTED TO

MAX17014 HIGH-VOLTAGE SWITCH CONFIGURATION

Installed*

VL

GON pin connected to SRC pin

Not installed

GND (through resistor R14)

GON pin connected to DRN pin

GON pin connected to SRC pin (CTL driven high)

Not installed (external logic

controller connected to CTL pad)

External logic controller

GON pin connected to DRN pin (CTL driven low)

Table 5. Jumper JU5 Functions

*

Default position.

SHUNT

POSITION

DRN PIN

CONNECTED TO

VGON

DISCHARGED

TOWARD

1-2*

AVDD (through resistor R15

and diode D6)

AVDD

2-3

PGND (through resistor R15)

PGND

Table 6. Jumper JU6 Functions

*

Default position.