MAX5035 Evaluation Kit

2

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Quick Start

The MAX5035 EV kit is fully assembled and tested.

Follow these steps to verify board operation. Do not

turn on the power supply until all connections are

completed.

5V Output Verification

1) Verify that a shunt is across pins 1 and 2 of jumper

2) Connect a voltmeter to the VOUT pad and GND

pad.

3) Connect a 12V DC power supply to the VIN pad.

Connect the supply ground to the GND pad.

4) Turn on the power supply and verify that VOUT is

at 5V.

For instructions on selecting the feedback resistors for

other output voltages, see the Evaluating Other Output

Voltages section.

Detailed Description

The MAX5035 EV kit features a 5W step-down DC-DC

switching-regulator circuit. The circuit uses a MAX5035

adjustable output-voltage converter to provide an out-

put voltage of 5V and can deliver up to 1A of current to

the output. The user must provide an 8V to 76V DC

source that is capable of supplying at least 2A of cur-

rent to power the circuit.

The MAX5035 converter’s built-in, high-side, low on-

resistance DMOS transistor reduces component count

while maximizing efficiency. Under light loads (approxi-

mately 85mA) the MAX5035 operates in pulse-skipping

mode, and under heavy loads it automatically enters

PWM mode. The circuit switches at 125kHz.

The EV kit features a PCB pad for the SHDN signal to

interface with an external controller. Startup delays can

be evaluated by installing resistor R4 and capacitor C5.

Jumper Selection

Shutdown Mode

The MAX5035 EV kit features a shutdown mode that

reduces the MAX5035 quiescent current to 10µA (typ),

thus reducing the power drain during shutdown mode.

The 3-pin jumper, JU1, selects the shutdown mode for

the MAX5035 EV kit. Table 1 lists the selectable jumper

options.

Component Suppliers

Note: Indicate that you are using the MAX5035 when contacting these component suppliers.

SUPPLIER

PHONE

FAX

WEBSITE

AVX Corp.

843-946-0238

843-626-3123

www.avxcorp.com

Coilcraft, Inc.

847-639-6400

847-639-1469

www.coilcraft.com

International Rectifier

310-322-3331

310-726-8721

www.irf.com

Panasonic Corp.

714-373-7366

714-737-7323

www.panasonic.com

TDK Corp.

847-803-6100

847-390-4405

www.component.tdk.com

Vishay

402-563-6866

402-563-6296

www.vishay.com

SHUNT

LOCATION

SHDN PIN

MAX5035 EV KIT

OUTPUT

1 and 2

Connected to VIN

through R3

MAX5035 enabled

2 and 3

Connected to GND

MAX5035 disabled

None

External controller

connected to SHDN

pad

Logic high = enabled,

Logic low = disabled

Table 1. Jumper JU1 Functions

Caution: Do not connect an external controller to the SHDN

pad while a shunt is on jumper JU1 since the external con-

troller may be damaged.