MAXM15063 datasheet(2/10 Pages) MAXIM

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Evaluates: MAXM15063 5V

Output-Voltage Application

MAXM15063 5V Output

Evaluation Kit

Detailed Description

The MAXM15063 EV kit is designed to demonstrate

salient features of MAXM15063 power module. The EV kit

includes an EN/UVLO PCB pad, and jumper J1, to enable

the output at a desired input voltage. Jumper J2 allows

selection of either PWM or PFM mode of operation based

on light-load performance requirements. An additional

RESET

pad is available for monitoring if the converter

output voltage is in regulation.

Output Capacitor Selection

X7R ceramic output capacitors are preferred due to their

stability over temperature in industrial applications. The

required output capacitor (C5) for 5V output is selected

from Table 1 of the MAXM15063 data sheet as 10µF/6.3V.

Fixed Output Voltage

The MAXM15063 is a fixed 5V output module. Connect

FB of MAXM15063 directly to VOUT for feedback control.

Enable/Undervoltage-Lockout (EN/UVLO)

Programming

The MAXM15063 offers an adjustable input undervoltage-

lockout feature. In this EV kit, for normal operation, leave

jumper J1 open. When J1 is left open, the MAXM15063

is enabled when the input voltage rises above 12V. To

disable MAXM15063, install a jumper across pins 2-3 on

J1. See Table 1 for J1 settings. A potential divider formed

by R1 and R2 sets the input voltage (VINU) at which the

module is enabled. The value of resistor R1 is chosen

to be 2.2MΩ, and R2 is calculated using the following

equation:

INU

1.215

( V

1.215 )

−

where R1 and R2 are in kΩ,

For MAXM15063 to turn on at 12V input, the Resistor R2

is calculated to be 249kΩ.

Input Capacitor Selection

The input capacitor serves to reduce the current peaks

drawn from the input power supply and reduces switching

frequency ripple at the input. The input capacitance must

be greater than or equal to the value given in Table 1 of

MAXM15063 data sheet. Input capacitor C3 is chosen to

be 1µF/100V.

Electromagnetic Interference (EMI)

Compliance to conducted emissions (CE) standards

requires an EMI filter at the input of a switching power

converter. The EMI filter attenuates high-frequency

cur¬rents drawn by the switching power converter, and

limits the noise injected back into the input power source.

Use EMI filter components as shown in Figure 1 in

conjunction with the schematic results in lower con-

ducted emissions below CISPR22 Class B limits. The

MAXM15063 EV kit PCB layout is also designed to limit

radiated emissions from switching nodes of the power

converter, resulting in radiated emissions below CISPR22

Class B limits.

*Default position

Figure 1. EMI Filter Components

Table 1. UVLO Enable/Disable

Configuration (J1)

POSITION

EN/UVLO PIN

MAXM15063_

OUTPUT

Not

Installed*

Connected to the

center node of

resistor-divider R1

and R2.

Programmed to startup

at desired input-voltage

level.

1-2

Connected to VIN

Enabled if VIN is greater

than VIN(MIN).

2-3

Connected to GND

Disabled

VIN_EMI

0.1µF

VIN

VIN_EMI

0.68µF

1µF

82µH

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