MAX15157BEVKIT datasheet(2/16 Pages) MAXIM

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Evaluates: MAX15157B

MAX15157B Evaluation Kit

7) Power on:

a) Turn both V1 (VIN) and V2 (REFINX) on at 0V.

b) Ramp up VIN to 13V, check VDRV for 8.8V

(powered by U2), and ENABLE > 0.7V

(EN threshold).

c) Ramp up VIN to 30V or higher, UVLO should

exceed 1V (threshold), and 4V6 pin (TP11) is

around 4.55V.

d) Ramp REFINX from 0V to 1.05V, VOUT is ap-

proximately 16.8V, and POW-OK (power good)

about 4.55V (same voltage level as TP11).

Detailed Description of Hardware

The MAX15157B EV kit is a fully assembled and tested

board to evaluate the performance of the MAX15157B

at 150W synchronous step-down and/or step-up

regulator. With the wide range of input and output voltage

(input from 8V to 60V, and output from 3V to 0.94% of

input), the MAX15157B is well suited for telecommunication

and industrial equipment applications.

Regulator Enable (EN)

The MAX15157B features a shutdown mode to minimize

the IC quiescent current. To shut down the IC, pull EN

below 0.55V or install a shunt on the jumper JU3.

Reference Voltage (REFIN)

The MAX15157B uses an internal 2V reference or an

external reference input. The IC regulates FB to the internal

2V or external voltage at REFINX, as shown at Table 3.

Switching Frequencies (FREQ/CLK)

The controller supports 120kHz to 1MHz switching

frequencies. The EV kit comes preset at a 600kHz switching

frequency with the CLOCKIN (FREQ/CLK) unconnected.

To adjust the switching frequency, either replace resistor

R3 (connected from FREQ/CLK to GND) by using the

following equation:

fSW = (R3/100kΩ) x 600kHz

or drive the FREQ/CLK (CLOCKIN) with an external clock

at twice speed of the switching frequency (it is not necessary

to remove R3 when applying the external clock).

Configuring the Output Voltage (VOUT)

VOUT voltage can be set between 3V to 0.94 x VIN, and

externally programmed by using the following equation:

VOUT = VREFINX x (R7 + R8)/R8

where VREFINX is the reference voltage in Table 3

(2V for preset mode, 1.05V to 2V for tracking mode).

Table 1. Default Setting of

MAX15157B EV Kit

Table 3. Reference Voltage (JU1)

Table 2. Regulator Enable (JU3)

JUMPER

SHUNT

POSITION

FUNCTION

JU1

1-2

Output tracking mode: set

external voltage to REFINX

JU2 to JU9

Open

JU10, JU11

1-2

Using U2 = MAX17552 on

board to provide 8.8V for DRV

SHUNT

POSITION

EN PIN

CONNECTION

MAX15157B

FUNCTION

Not installed

Pull up to DRV

through R4

Enabled

Installed

GND

Disabled

SHUNT

POSITION

REFIN PIN

CONNECTION

REFERENCE

VOLTAGE

VOUT

RANGE

1-2

(Tracking mode)

To external Voltage

(at REFINX)

User-supplied reference voltage

Range: 1.05V to 2V

VOUT = 16.8V to 32V

(Increase R7 to get the higher VOUT)

2-3

(Preset mode)

To BIAS 4V6 pin

Internal 2V reference

VOUT = 32V

(Increase R7 to get the higher VOUT)

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