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Evaluates: MAX15158Z

MAX15158Z Evaluation Kit

Detailed Description of Hardware

The MAX15158Z EV kit provides a proven design to

evaluate the MAX15158Z, fully integrated, highly efficient,

two-phase switching regulator. The EV kit can be easily

connected between power input and the load using the

banana jacks and connectors provided for the input and

output. Test points and connectors are provided to moni-

tor and control the device signals. The EV kit operates

between input voltage -8V to -60V. The EV kit regulates

the output voltage between 3.3V to 60V. The output

voltage is set to 35V by default on the EV kit. The output

voltage can be changed by changing resistor divider

between VOUT+ pin and OUTP pin. Make sure that the

correct compensation is selected for stable operation.

EN/UVLO Input for the MAX15158Z

The device’s enable input (EN/UVLO) is controlled by

resistor divider ratio between R19 and R20. The divider

ratio is chosen so that the VIN UVLO threshold is set

at 21V by default. If EN/UVLO pin voltage is above

1V, MAX15158Z will power up. EN/UVLO pin can be

connected to VIN- to disable the regulation. Additionally, a

test point (EN) is also provided to drive the EN/UVLO pin.

While changing the UVLO threshold, make sure that the

UVLO threshold of MAX15158Z is higher than the UVLO

threshold of the onboard DRV supply MAX17552 (U4).

DRV Supply Selection

MAX15158Z and MAX15013 requires a secondary 8V–12V

power supply (DRV) for the LDO and gate drive. The

supply for DRV pin can be selected from onboard supply

by installing shuts across jumpers J3 and J4. Alternatively,

an external power supply can be used by applying and

8V–12V between test points VDRV and PGND.

Bode Plot

10Ω resistor is installed between VOUT_P sense point

and OUTP pin to measure bode plot. BODE+ and BODE-

test points are provided on the board on either side of 10Ω

resistor for small-signal injection and ability to measure

bode plot.

Output Regulation

VOUT_P and VOUT_N test points are provided to

measure the VOUT regulation.

Efficiency Measurement

FREQ/CLK Pin

Switching frequency is selected by connecting R16 resis-

tor between FREQ/CLK pin and VIN-. The switching

frequency can also be selected by providing a 480kHz to

4MHz external clock at this pin. A test point (CLOCK) is

also provided to drive this pin.

REFIN Pin

By default, REFIN pin is connected to BIAS supply

through R9 (0Ω resistor). R9 can be removed and REFIN

can be connected to external supply (between 1V to 2.2V)

to change the VOUT reference and therefore change

output regulation voltage. The external supply should be

applied between test point REFIN and AGND.

Connecting Multiple EV Kits Together

The EV kit provides jumpers J1, J2, J8, J9, J10, and J11

to connect two EV kits together for four-phase operation.

Based on the MAX15158Z data sheet, the EV kits can be

configured for master and slave operation.

# Denotes RoHS Compliant

*Default position

Table 1. J3 and J4 Jumper Selection

PART

TYPE

MAX15158ZEVKIT#

EV kit

JUMPER CONNECTIONS

VLDOIN VOLTAGE

J3 installed and J4 installed*

Onboard Power supply

J3 not installed and J4 not

installed

External Power Supply

Ordering Information