MAX1531EVKIT Maxim Integrated Products, MAX1531EVKIT Datasheet - Page 5

• 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 2. Jumper JU2 Functions
The EV kit features adjustable power-up sequencing for
several of the linear regulators. After the MAX1531’s EN
pin goes high, the internal VL linear regulator starts up
and the step-down switching regulator soft-starts.
When the step-down regulator reaches regulation, the
logic-voltage-supply linear regulator (VLOG) and the
sequence block that controls the other four linear regu-
lators are simultaneously enabled. The logic regulator
soft-starts immediately but the sequence block starts
only if SEQ is high. SEQ is controlled by JU3.
Each linear regulator soft-starts individually when it is
enabled. After SEQ goes high, the ONL2 to ONL5 pins
each source current into C11, which controls the overall
time for startup. Resistors R14, R15, and R16 determine
the startup spacing between the respective regulator
and JU8 to JU11 determine the startup order. Each
regulator starts after SEQ is high and its ONL_ pin
Table 4. ONL2 Setting (JU4 and JU8)
LOCATION
(Default)
Installed
SHUNT
JU4 SHUNT
LOCATION
None
(Default)
1-2
1-4
1-3
Connected to GND
Connected to VL
_______________________________________________________________________________________
Power-Up Sequencing (SEQ)
through R5
FREQ PIN
JU8 SHUNT
LOCATION
Don’t Care
Don’t Care
(Default)
1-2
1-3
1-4
1-5
Frequency = 250kHz
Frequency = 500kHz
MAX1531 EV KIT
FREQUENCY
Connected to C11
Connected to R14
Connected to R15
Connected to R16
Connected to VL
Connected to
through R39
ONL2 PIN
GND
MAX1531 Evaluation Kit
Gamma linear regulator enabled immediately if JU3 is removed
(SEQ = high) and step-down switching regulator soft-start is
finished. Sequence not used.
Gamma linear regulator disabled.
Gamma linear regulator soft-starts about 6ms after sequence
block enabled.
Gamma linear regulator soft-starts about 9ms after sequence
block enabled.
Gamma linear regulator soft-starts about 12ms after sequence
block enabled.
Gamma linear regulator soft-starts about 15ms after sequence
block enabled.
exceeds 1.24V. JU4 to JU7 enable immediate startup
of their respective regulator after the step-down regula-
tor reaches regulation and SEQ is high, without addi-
tional delay. (See the Power-Up Sequencing section.)
See Tables 3 through 7 for configuring the jumpers.
Table 3. Jumper JU3 Function
LOCATION
(Default)
Installed
SHUNT
None
VL through R6
Connected to
Connected to
SEQUENCING MODE
SEQ PIN
GND
Sequence block disabled.
VSRC, VGAM, GON, and
GOFF disabled, regardless of
ONL2 to ONL5 voltage levels.
Sequence block enabled.
Each ONL_ sources 2µA.
VGAM soft-starts when ONL2
reaches 1.24V.
GON soft-starts when ONL3
reaches 1.24V.
VSRC soft-starts when ONL4
reaches 1.24V.
GOFF soft-starts when ONL5
reaches 1.24V
MAX1531 STATE
5