MAX1889EVKIT Maxim Integrated Products, MAX1889EVKIT Datasheet - Page 4

• Manufacturer Part Number: MAX1889EVKIT
• Description: Power Management Modules & Development Tools MAX1889 EVAL KIT MAX1889 EVAL KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX1889EVKIT

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

The negative charge pump of the MAX1889 EV kit fea-
tures an option to cascade up to three stages of charge
pumps. Each stage of the charge pump can be pow-
ered from INPUT, PGND, or the previous stage. JU3,
JU4, and JU5 configure the number of stages and
select the voltage source for the negative charge pump
on the MAX1889 EV kit. Tables 6, 7, and 8 list the
jumper options. The default configuration of the nega-
tive charge pump of the MAX1889 EV kit is a one-stage
charge pump powered from PGND as indicated in
Table 8. Refer to the Charge Pumps section of the
MAX1889 data sheet for information on selecting a
charge-pump configuration.
MAX1889 Evaluation Kit
Table 1. JU1 Functions
4
Table 3. JU8 Functions
LOCATION
LOCATION
Installed
SHUNT
SHUNT
None
None
None
_______________________________________________________________________________________
1-2
2-3
External controller
POSITIVE CHARGE
Connected to INPUT
Connected to IN
Connected to VBST
to SHDN pad
FIRST STAGE
Connected
through R3
SHDN PIN
connected
to PGND
Not used
PUMP
Negative Charge Pump
Shutdown mode
MAX1889 enabled
Logic high (IN) = enabled,
logic low (PGND) = disabled
MAX1889 EV KIT OUTPUT
First stage of a three-
stage charge pump
powered by VBST
First stage of a three-
stage charge pump
powered by INPUT
Not used for one-stage
or two-stage charge
pumps
OPERATING MODE
The MAX1889 EV kit’s step-up switching-regulator out-
put is set to 9V by feedback resistors R5 and R6. To
generate output voltages other than 9V (up to 13V),
select different external voltage-divider resistors (R5,
R6). The output capacitors (C4, C5, and C6) are rated
to 10V. To set the output voltage greater than 10V, use
higher-voltage rated capacitors. Refer to the Main Step-
Up Regulator, Output Voltage Selection section in the
MAX1889 data sheet for instructions on selecting the
resistors.
Table 4. JU7 Functions
Table 2. JU2 Functions
LOCATION
LOCATION
(Default)
SHUNT
Installed
SHUNT
None
1-2
1-3
1-4
None
Connected to previous
POSITIVE CHARGE
Connected to INPUT
stage charge-pump
Connected to VBST
Output Voltage Selection
SECOND STAGE
IN through R4
Connected to
Connected
FREQ PIN
to PGND
Step-Up Switching-Regulator
Not used
PUMP
output
Frequency = 500KHz
Frequency = 1MHz
First stage of a two-
stage charge pump
powered by VBST
Second stage of a
three-stage charge
pump
First stage of a two-
stage charge pump
powered by INPUT
Not used for one-stage
charge pumps
MAX1889 EV KIT
Output Voltage
FREQUENCY
OPERATING
MODE