Datasheet

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Positive Linear-Regulator

Output Voltage

The MAX1889 EV kit’s positive linear-regulator output is

set to 20V by feedback resistors R13 and R14. To gen-

erate output voltages other than 20V (1.25V to 28V),

select different external voltage-divider resistors (R13,

R14). Refer to the Linear-Regulator Controllers, Output

Voltage Selection section in the MAX1889 data sheet

for instructions on selecting the resistors.

Negative Linear-Regulator

Output Voltage

The MAX1889 EV kit’s negative linear-regulator output

is set to -7V by feedback resistors R10 and R11. To

generate output voltages other than -7V (0 to -22V),

select different external voltage-divider resistors (R10,

R11). Refer to the Linear-Regulator Controllers, Output

Voltage Selection section in the MAX1889 data sheet

for instructions on selecting the resistors.

Evaluates: MAX1889

MAX1889 Evaluation Kit

_______________________________________________________________________________________ 5

SHUNT

LOCATION

THIRD STAGE

POSITIVE CHARGE

PUMP

OPERATING

MODE

1-2 Connected to VBST

One-stage charge

pump powered by

VBST

1-3

(Default)

Connected to

previous stage

charge-pump output

Last stage of a

two-stage or

three-stage

charge pump

1-4 Connected to INPUT

One-stage charge

pump powered by

INPUT

Table 5. JU6 Functions

SHUNT

LOCATION

FIRST STAGE

NEGATIVE CHARGE

PUMP

OPERATING

MODE

1-2 Connected to INPUT

First

stage of a three-

stage charge pump

2-3 Connected to PGND

First stage of a three-

stage charge pump

None Not used

Not used for one-

stage or two-stage

charge pump

Table 6. JU3 Functions

SHUNT

LOCATION

SECOND STAGE

NEGATIVE CHARGE

PUMP

OPERATING

MODE

1-2 Connected to INPUT

First

stage of a two-

stage charge pump

1-3

Connected to

previous stage

charge-pump output

Second stage of a three-

stage charge pump

1-4 Connected to PGND

First

stage of a two-

stage charge pump

None Not used

Not used for one-stage

charge pump

Table 7. JU4 Functions

SHUNT

LOCATION

THIRD STAGE

NEGATIVE CHARGE

PUMP

OPERATING

MODE

1-2 Connected to INPUT

One-stage charge pump

1-3

Connected to

previous stage

charge-pump output

Last stage of a two-

stage or three-stage

charge pump

1-4

(Default)

Connected to PGND

One-stage charge pump

Table 8. JU5 Functions