Analog Devices MAX17625 Manual de usuario

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MAX17625/MAX17626

Evaluation Kits

Evaluates: MAX17625/MAX17626

Converters in Application

319-100853; Rev 0; 12/21

General Description

The MAX17625/MAX17626 evaluation kits (EV kits)

provide a proven design to evaluate the performance of

the MAX17625/MAX17626 converters. Each of these

devices operate over an input range from 2.7V to 5.5V

and deliver up to 700mA output current. The devices are

configured to demonstrate optimum performance and

component sizes in the EV kits.

The MAX17625 converter delivers up to 700mA at a

switching frequency of 2MHz. The converter is

configured for a 1.2V output over a 2.7V to 5.5V input

range.

The MAX17626 converter delivers up to 700mA at a

switching frequency of 4MHz. The converter is

configured for a 3.3V output over a 3.6V to 5.5V input

range.

The EV kits feature provisions for selecting the Mode of

operation (PWM/PFM), Enable input, and PGOOD

signal. The MAX17625/MAX17626 converter data sheet

provides a complete description of the parts that should

be read in conjunction with this data sheet prior to

operating the EV kits.

Features

•2.7V to 5.5V Input-Voltage Range

•MAX17625 Offers High 90.6% Efficiency (VIN = 3.3V,

VOUT = 1.2V, IOUT = 400mA)

•MAX17626 Offers High 94.5% Efficiency (VIN = 5V,

VOUT = 3.3V, IOUT = 500mA)

•Up to 700mA Load Current

•2MHz Fixed Switching Frequency for the MAX17625

•4MHz Fixed Switching Frequency for the MAX17626

•Selectable Pulse-Width Modulation (PWM) and

Pulse-Frequency Modulation (PFM) Modes of

Operation

•Internal 1ms Soft-Start Time

•Power-Good (PGOOD) Output with Pullup Resistor

to Respective Input Voltages

•Low-Profile, Surface-Mount Components

•Proven PCB Layout

•Fully Assembled and Tested

Ordering Information at end of data sheet.

EV Kits Top View

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Evaluates:

MAX17625/MAX17626

Converters in Application

MAX17625/MAX17626 Evaluation Kits

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Analog Devices | 2

Quick Start

Configuration Diagram

MAX17625 EV KIT/

MAX17626 EV KIT

GND GND

VOUT

LOAD

+ -

VIN

POWER

SUPPLY

+ -

Figure 1. MAX17625/MAX17626 EV Kits Setup Diagram

Required Equipment

•One 2.7V to 5.5V DC, 700mA power supply

•Load resistors capable of sinking up to 700mA at 1.2V and 3.3V

•Digital multimeter (DMM)

Procedure

A typical bench setup for the MAX17625/MAX17626 EV kits is shown in Figure 1.

The EV kits are fully assembled and tested. Follow the steps to verify and test individual converters operation.

Caution: Do not turn on power supply until all connections are completed.

1. Disable the power supply and set the input power supply at a valid input voltage.

2. Connect the positive terminal and negative terminal of the power supply to the VIN pad and its adjacent GND pad of

the converter under evaluation, respectively.

3. Connect a maximum 700mA resistive load across the VOUT pad and its nearest GND pad of the corresponding

converter.

4. Verify that shunts are installed in the default position on jumpers (JU101 and JU201) (see Table 1 for details).

5. Select the shunt position on jumpers (JU102, JU202) according to the required mode of operation (see Table 2 for

details).

6. Connect the digital multimeter (in voltage measurement mode) across the VOUT and its respective GND pad.

7. Turn on the input power supply.

8. Verify that the digital multimeter displays 1.2V for MAX17625 and 3.3V for MAX17626 output terminal voltages,

respectively with respect to GND.

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Evaluates:

MAX17625/MAX17626

Converters in Application

MAX17625/MAX17626 Evaluation Kits

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Analog Devices | 3

Detailed Description

The MAX17625/MAX17626 EV kits are designed to demonstrate the salient features of the MAX17625/MAX17626 power

converters. The EV kits consist of typical application circuits of two different converters. Each of these circuits are

electrically isolated from each other and hosted on the same printed circuit board (PCB). Each of these circuits can be

evaluated for its performance under different operating conditions by powering them from their respective input pins.

MODE Selection

TheMAX17625/MAX17626supportsPWMandPFMmodesofoperation.IntheEVkits,leavethejumpers (JU102,JU202)openfor

operatingtheconvertersin PFMmodeatlight-load.InstallshuntstoconfiguretheconvertersinPWM mode.SeeTable2forjumpers

(JU102andJU202)settings.Refertothe ModeSelectionsectionoftheMAX17625/MAX17626 datasheet formoredetails.

Adjusting Output Voltage

The MAX17625 supports a 0.8V to 1.5V adjustable output voltage and the MAX17625 EV kit output voltage is preset to 1.2V.

The MAX17626 supports a 1.5V to 3.3V adjustable output voltage and the MAX17626 EV kit output voltage is preset to 3.3V.

For the MAX17625, the output voltage is programmed using the resistor divider R101 and R102 and for the MAX17626,

the output voltage is programmed using the resistor divider R201 and R202. Refer to the Adjusting Output Voltage section

in the MAX17625/MAX17626 data sheet for more details.

Output Capacitor Selection

The X7R ceramic capacitors are preferred due to their stability overtemperature in industrial applications. For the MAX17625,

the required output capacitor (C106) is 22μF/6.3V and for the MAX17626, the required output capacitor (C206) is 10μF/10V.

Refer to the Output Capacitor Selection section in the MAX17625/MAX17626 data sheet for more details.

Input Capacitor Selection

The input capacitors C103 for the MAX17625 and C203 for the MAX17626 serve to reduce the current peaks drawn from

the input power supply and reduce switching frequency ripple at the input. Refer to the Input Capacitor Selection section

in the MAX17625/MAX17626 data sheet to choose input capacitance. A 2.2μF/10V input capacitor is chosen for both the

MAX17625 and MAX17626.

Hot Plug-In and Long cables

The MAX17625/MAX17626 EV kits PCB provides optional Tantalum capacitors (C102 for MAX17625 and C202 for

MAX17626, 47μF/8V) to dampen input-voltage peaks and oscillations that can arise during hot plug-in and/or due to long

input cables. These capacitors limit the peak voltage at the input of the device when the EV kits are powered directly from

a precharged capacitive source or an industrial backplane PCB. Long input cables between the input power source and

the EV kits circuit can cause input-voltage oscillations due to the inductance of the cables. The equivalent series

resistance (ESR) of the Tantalum capacitor helps damp out the oscillations caused by long input cables. Further,

capacitors (C101, C104, C105 for the MAX17625 and C201, C204, C205 for the MAX17626) placed near the input of the

board and near the IN pin of the converter helps in attenuating high-frequency noise.

Table 1. EN Jumper Description (JU101, JU201)

SHUNT POSITION

EN PIN

OUTPUT

1–2*

Connected to VIN

Enabled

2–3

Connected to GND

Disabled

*Default Position

Table 2. MODE Jumper Description (JU102, JU202)

SHUNT POSITION

MODE PIN

MODE

1–2

Connected to GND

OperatesinPWMModeinallloadconditions

Not Installed*

Unconnected

OperatesinPFMModein light-loadconditions

*Default Position

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Evaluates:

MAX17625/MAX17626

Converters in Application

MAX17625/MAX17626 Evaluation Kits

www.analog.com

Analog Devices | 4

MAX17625/MAX17626 EV Kits Performance

(VIN = VEN = 5V, TA= +25°C, unless otherwise noted.)

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Evaluates:

MAX17625/MAX17626

Converters in Application

MAX17625/MAX17626 Evaluation Kits

www.analog.com

Analog Devices | 5

MAX17625/MAX17626 EV Kits Performance Report (Continued)

(VIN = VEN = 5V, TA= +25°C, unless otherwise noted.)

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Evaluates:

MAX17625/MAX17626

Converters in Application

MAX17625/MAX17626 Evaluation Kits

www.analog.com

Analog Devices | 6

MAX17625/MAX17626 EV Kits Performance Report (Continued)

(VIN = VEN = 5V, TA= +25°C, unless otherwise noted.)

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Evaluates:

MAX17625/MAX17626

Converters in Application

MAX17625/MAX17626 Evaluation Kits

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Analog Devices | 7

MAX17625 EV Kit Bill of Materials

ITEM

QTY

DESIGNATOR

DESCRIPTION

MANUFACTURER PART NUMBER

C101, C104, C107

0.1µF±10%, 10V, X7R, ceramic capacitor (0402)

TDK C1005X7R1C104K050BC

C102

47µF±20%, 8V, Tantalum capacitor (3528)

Kemet T520B476M008ATE035

C103

2.2µF±10%, 10V, X7R, ceramic capacitor (0603)

Murata GRM188R71A225KE15

C105

150pF±5%, 100V, COG, Ceramic capacitor (0402)

TDK C1005C0G2A151J050BA

C106

22µF±20%, 6.3V, X7R, ceramic capacitor (0805)

Murata GRM21BZ70J226ME44

L101

1.5µH±20%, 2.7A, Inductor (2520)

Murata DFE252012F-1R5M

R101

18.7kΩ±1% resistor (0402)

Vishay CRCW040218K7FK

R102

37.4kΩ±1% resistor (0402)

Vishay CRCW040237K4FK

R103

100kΩ±1% resistor (0402)

Panasonic ERJ-2RKF1003X

U101

MAX17625 TDFN8-EP

Maxim MAX17625ATA+

MAX17626 EV Kit Bill of Materials

ITEM

QTY

DESIGNATOR

DESCRIPTION

MANUFACTURER PART NUMBER

C201, C204, C207

0.1µF±10%, 10V, X7R, ceramic capacitor (0402)

TDK C1005X7R1C104K050BC

C202

47µF±20%, 8V, Tantalum capacitor (3528)

Kemet T520B476M008ATE035

C203

2.2µF±10%, 10V, X7R, ceramic capacitor (0603)

Murata GRM188R71A225KE15

C205

150pF±5%, 100V, COG, Ceramic capacitor (0402

TDK C1005C0G2A151J050BA

C206

10µF±10%, 10V, X7R, ceramic capacitor (0603)

Murata GRM188Z71A106KA73

L201

1µH±20%, 3.8A, Inductor (2520)

Murata DFE252012F-1R0M

R201

118kΩ±1% resistor (0402)

Vishay CRCW0402118KFK

R202

37.4kΩ±1% resistor (0402)

Vishay CRCW040237K4FK

R203

100kΩ±1% resistor (0402)

Panasonic ERJ-2RKF1003X

U201

MAX17626 TDFN8-EP

Maxim MAX17626ATA+

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Evaluates:

MAX17625/MAX17626

Converters in Application

MAX17625/MAX17626 Evaluation Kits

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Analog Devices | 8

MAX17625 EV Kit Schematic Diagram

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Evaluates:

MAX17625/MAX17626

Converters in Application

MAX17625/MAX17626 Evaluation Kits

www.analog.com

Analog Devices | 9

MAX17626 EV Kit Schematic Diagram

Evaluates:

MAX17625/MAX17626

Converters in Application

MAX17625/MAX17626 Evaluation Kits

www.analog.com

Analog Devices | 10

MAX17625/MAX17626 EV Kits PCB Layout Diagrams

MAX17625/MAX17626 EV Kits PCB Layout—Top Silkscreen

MAX17625/MAX17626 EV Kits PCB Layout—Top Layer

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