MAX1531EVKIT Maxim Integrated Products, MAX1531EVKIT Datasheet - Page 7

• Manufacturer Part Number: MAX1531EVKIT
• Description: Power Management Modules & Development Tools MAX1531 EVAL KIT MAX1531 EVAL KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX1531EVKIT

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

Table 7. ONL5 Setting (JU7 and JU11)
The positive charge pump of the MAX1531 EV kit pow-
ers the GON linear regulator and features an option to
cascade up to two charge-pump stages. The charge
pump’s first stage can be connected to PIN or VOUT,
and the charge pump’s second stage can be connect-
ed to PIN or the previous stage. Jumpers JU12 and
JU13 configure the number of stages and select the
voltage source for the positive charge pump on the
MAX1531 EV kit. Tables 8 and 9 list the jumper options.
The default configuration of the positive charge pump
of the MAX1531 EV kit is a two-stage charge pump
powered from PIN as indicated in Tables 8 and 9.
Since the positive charge pump powers the GON linear
regulator, ensure that the combination of the charge-
pump configuration and the input voltage range (PIN)
does not over stress the GON linear regulator’s external
pass transistor. The V
MMBT3904 used on this EV kit is 40V. If the input volt-
age (PIN) exceeds +13.2V, either reconfigure the
charge pump (using JU12 and JU13) as a two-stage
charge pump from VOUT or a one-stage charge pump
from PIN, as appropriate, or select a higher-voltage-
rated transistor for Q3. Also, if higher charge-pump
voltages are required, ensure that Q6 and C15 are not
over stressed. Refer to the Charge Pumps section of
the MAX1531 data sheet for more information on select-
ing a charge-pump configuration.
JU7 SHUNT
LOCATION
(Default)
1-2
1-4
1-3
_______________________________________________________________________________________
JU11 SHUNT
LOCATION
Don’t Care
Don’t Care
CEO
(Default)
Positive Charge Pump
1-2
1-3
1-4
1-5
maximum rating of the
Connected to R14
Connected to R15
Connected to R16
Connected to C11
Connected to VL
Connected to
through R42
ONL5 PIN
GND
MAX1531 Evaluation Kit
GOFF linear regulator enabled immediately if JU3 is removed
(SEQ = high) and step-down switching regulator soft-start is
finished. Sequence not used.
GOFF linear regulator disabled.
GOFF linear regulator soft-starts about 6ms after sequence block
enabled.
GOFF linear regulator soft-starts about 9ms after sequence block
enabled.
GOFF linear regulator soft-starts about 12ms after sequence
block enabled.
GOFF linear regulator soft-starts about 15ms after sequence
block enabled.
Table 8. Jumper JU12 Functions
Table 9. Jumper JU13 Functions
LOCATION
LOCATION
(Default)
SHUNT
(Default)
SHUNT
None
None
1-2
2-3
1-2
2-3
previous stage
Connected to
Connected to
charge-pump
2ND STAGE
Connected to
Connected to
1ST STAGE
POSITIVE
CHARGE
POSITIVE
Not used
CHARGE
SEQUENCING MODE
Not used
PUMP
output
PUMP
VOUT
PIN
PIN
One-stage charge pump
connected to PIN.
Last stage of a two-stage
charge pump.
Charge pump not used.
First stage of a two-stage
charge pump connected to
PIN.
First stage of a two-stage
charge pump connected to
VOUT.
The first stage is not used for
one-stage charge pumps.
OPERATING MODE
OPERATING MODE
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