MAX15003EVKIT+【PDF 5/12 页】KIT EVAL FOR MAX15003

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MAX15003 Evaluation Kit

Table 2. Track/Sequence Operation (Jumper JU1)

SHUNT POSITION

1-2*

2-3

SEL PIN CONNECTION

Connected to REG

Connected to SGND

EV KIT VOUT_

OPERATION

Ratiometric tracking

mode*

Coincident tracking

mode

Sequence mode

EV KIT CIRCUIT MODIFICATIONS

Open resistors (R2, R26)

Short/0 Ω resistors (R3, R27)

Calculate values for resistors R2, R3, R26, and R27

*Default position.

Output Sequencing/Tracking

The MAX15003 IC can be programmed to power up

and power down the three outputs in sequence, ratio-

metric tracking, or coincident tracking mode by config-

uring the SEL pin. The MAX15003 EV kit features jumper

JU1 to configure the SEL pin. See Table 2 for jumper

JU1 configuration. The EV kit circuit is configured for

ratiometric tracking operation by default (resistors R3

and R27 shorted with PC trace), and can be easily mod-

ified for sequencing or coincident tracking. In ratiomet-

ric tracking mode, the soft-start controllers for VOUT1,

Phase Operation

The three DC-DC converters can switch in phase or at

120° out-of-phase. Operating the converters in the out-

of-phase mode increases the input capacitor ripple fre-

quency, reduces the RMS input ripple current, and thus

the size of the input bypass capacitor requirement. EV

kit jumper JU2 is used to configure the phase mode

operation. See Table 3 for jumper JU2 configuration.

Table 3. Phase Mode (Jumper JU2)

VOUT2, and VOUT3 are synchonized, and hence their

respective output voltages will track ratiometrically.

In concident tracking mode, the VOUT2 and VOUT3

output voltages ramp up, tracking the VOUT1 voltage

SHUNT

POSITION

1-2

2-3*

PHASE PIN

CONNECTION

Connected to REG

Connected to SGND

EV KIT OPERATION

In-phase mode

120° out-of-phase mode

depending on the resistor-divider ratio used for R2/R3

and R26/R27, respectively.

In sequencing mode, VOUT2 and VOUT3 outputs do

not turn on until the voltage at the IC EN/TRACK_ input

pin for each output reaches 1.22V. The ratio of resistor

pairs R2/R3 and R26/R27 set the voltage threshold that

VOUT1 must reach before VOUT2 and VOUT3 are

turned on.

For sequencing or concident tracking operation, the EV

kit PCB requires modification. Cut open the shorting PCB

trace at resistors R3 and R27 and install resistors R2, R3,

R26, and R27. Refer to the Coincident/Ratiometric

Tracking (SEL, EN/TRACK_) and the Output-Voltage

Sequencing (SEL, EN/TRACK_, PGOOD) sections in the

MAX15003 IC data sheet to calculate the proper values

for resistors R2, R3, R26, and R27.

*Default position.

Status Output Signals

The MAX15003 EV kit provides PGOOD1, PGOOD2,

and PGOOD3 logic output signals to indicate the regu-

lation state of VOUT1, VOUT2, and VOUT3. A logic-low

at the PGOOD_ pads indicates that output voltage has

dropped below 92.5% of its regulation voltage. Each

PGOOD_ signal is pulled high to the respective VOUT_

voltage when in regulation. The EV kit also provides a

RESET logic output signal that indicates when all three

PGOOD outputs are logic-high. The RESET output is

pulled high (5V) after all three PGOOD signals are

pulled high and a timeout period of 22ms has elapsed.

Use the following equation to calculate the new capaci-

tor value for C22 to modify the timeout period:

C 22 =

2 μ A × T TIMEOUT

2 V

_______________________________________________________________________________________

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