MAX5097AEVKIT+ [MAXIM]

The EV kit circuit features a MAX5097A IC in a 16-pin TQFN package;


型号：	MAX5097AEVKIT+
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	The EV kit circuit features a MAX5097A IC in a 16-pin TQFN package
文件：	总6页 (文件大小：127K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-0718; ꢁev 0; 1/07

MAX5097A Evaluation Kit

Evluates:MX5097A

General Description

Features

The MAX5097A evaluation kit (EV kit) demonstrates the

MAX5097A in a standard application circuit demon-

strating high efficiency. The EV kit circuit features a

MAX5097A IC in a 16-pin TQFN package. The EV kit

can operate from a 5V to 40V input source.

♦ 5V to 40V Input Voltage (Buck Mode)

♦ 4V to 40V Input Voltage (LDO Mode)

♦ 3.3V Output at Up to 600mA (Buck Mode)

♦ Low Quiescent Current 3.3V Output at Up to

The MAX5097A EV kit includes a current-mode DC-DC

step-down regulator (Buck Mode) and a selectable low-

quiescent-current LDO regulator for operation at light-

load (LDO Mode). The step-down regulator provides a

3.3V output with up to 600mA output current. In LDO

Mode, the MAX5097A IC provides up to 100mA output

current. The EV kit circuit’s step-down regulator oper-

ates at a switching frequency of 330kHz, thus allowing

the use of small ceramic capacitors at the output. The

MAX5097A is capable of synchronizing to an external

digital clock.

100mA (LDO Mode)

♦ Configurable Output Voltage

♦ 330kHz Switching Frequency

♦ Capable of Synchronizing to an External Clock

♦ Open-Drain RESET Output PCB Pad

♦ Surface-Mount Components

♦ Fully Assembled and Tested

Ordering Information

The MAX5097A EV kit can be reconfigured for other

output voltages by selecting appropriate external com-

ponents. The EV kit circuit features soft-start, output

current-limit, and an open-drain active-low reset output

PCB pad.

PART

TEMP RANGE

IC PACKAGE

MAX5097AEVKIT+

0°C to +70°C*

16 TQFN-EP

+Denotes a lead-free and ꢁoHS-compliant EV kit.

*This limited temperature range applies to the EV kit PCB only.

The MAX5097A IC temperature range is -40°C to +125°C.

Component List

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

150µF, 50V electrolytic capacitor

(8mm x 10.2mm)

Panasonic EEVFK1H151P

0.047µF 10ꢀ, 50V X7ꢁ ceramic

capacitor (0603)

Murata GꢁM188ꢁ71H473K

0.22µF 10ꢀ, 50V X5ꢁ ceramic

capacitor (0805)

Murata GꢁM21Bꢁ71H224K

2.0A, 60V high-speed switching diode

(SMA)

Diodes Inc MUꢁS120-13-F

JU1, JU2

JU3

2-pin headers

3-pin header

22µF 20ꢀ, 6.3V X5ꢁ ceramic

capacitor (1206)

Murata GꢁM31Cꢁ60J226M

22µH, 1.6A inductor

Sumida CDꢁH8D28-220NP

1200µF 5ꢀ, 50V C0G ceramic

capacitor (0603)

Murata GꢁM1885C1H122J

ꢁ1

ꢁ2

Not installed, resistor (0603)

0Ω 5ꢀ resistor (0603)

ꢁ3

100kΩ 1ꢀ resistor (0603)

100kΩ 5ꢀ resistors (0603)

10kΩ 5ꢀ resistor (0603)

40V input, 330kHz step-down

converter with LDO

22pF 5ꢀ, 50V C0G ceramic

capacitor (0603)

Murata GꢁM1885C1H220J

ꢁ4, ꢁ5, ꢁ7

ꢁ6

0.01µF 10ꢀ, 50V X7ꢁ ceramic

capacitor (0603)

Murata GꢁM188ꢁ71H103K

MAX5097AATE+

(16-pin, 5mm x 5mm thin QFN-EP)

1µF 10ꢀ, 10V X5ꢁ ceramic

capacitor (0603)

Murata GꢁM188ꢁ61A105K

—

Shunts

PCB: MAX5097AEVKIT+

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MAX5097A Evaluation Kit

Detailed Description

Component Suppliers

The MAX5097A EV kit includes a high-efficiency cur-

rent-mode DC-DC step-down regulator (Buck Mode)

and a selectable low-quiescent-current LDO regulator

(LDO Mode). The EV kit circuit features a MAX5097A IC

in a 16-pin TQFN exposed paddle package. The

MAX5097A EV kit operates from a 5V to 40V input

range DC source that can provide the EV kit with 1A or

more of current.

SUPPLIER

Diodes Inc.

Murata

PHONE

WEBSITE

805-446-4800 www.diodes.com

770-436-1300 www.murata.com

714-373-7366 www.panasonic.com

847-545-6700 www.sumida.com

Panasonic

Sumida

Note: Indicate that you are using the MAX5097A when contact-

ing these component suppliers.

The Buck Mode regulator provides a 3.3V output at up

to 600mA output current. An internal p-channel MOS-

FET works as a pass element when in LDO Mode and

delivers up to 100mA of load current. ꢁesistors ꢁ1 and

ꢁ2 set the output voltage at VOUT. The output voltage

can be adjusted from 1.24V to 11V by selecting appro-

priate resistors. The EV kit’s Buck Mode regulator oper-

ates at a switching frequency of 330kHz or the circuit

can be configured to synchronize with an external clock

by removing jumper JU2.

Quick Start

The MAX5097A EV kit is fully assembled and tested.

Follow these steps to verify board operation. Caution:

Do not turn on the power supply until all connec-

tions are completed.

Required Equipment

•

5V to 40V, 1A rated DC power supply

One voltmeter, one ammeter

When configured for synchronizing mode, an external

TTL square-wave clock is used to synchronize and set

the switching frequency up to 500kHz. SYNC and SGND

PCB pads are provided for connecting the external clock.

See the Clock Synchronization section for more informa-

tion on the external clock.

Evluates:MX5097A

Electronic load, such as an HP 6060B

Output Startup

1) Verify that a shunt is installed across jumpers JU1

(LDO/BUCK, Buck Mode enabled) and JU2 (SYNC,

330kHz).

Capacitor C8 sets the soft-start feature. An open-drain

active-low ꢁESET PCB pad is provided for interfacing.

The ꢁESET pad is pulled up to VOUT by resistor ꢁ4, and

jumper JU3 controls the shutdown mode that reduces the

MAX5097A IC shutdown current to 6µA (typ).

2) Verify that a shunt is installed across pins 1-2 of

jumper JU3 (EN, input enabled).

3) Connect the electronic load positive terminal to the

VOUT pad and connect the load’s negative terminal

to the PGND pad.

Jumper Selection and VOUT

Reconfiguration

4) Connect the voltmeter to the VOUT and PGND pads.

Step-Down and Low-Quiescent-Current

LDO Regulators

The MAX5097A EV kit features two modes for regulat-

ing the output; a Buck Mode regulator or a low-quies-

cent-current LDO Mode regulator. The 2-pin jumper,

JU1, selects the mode of operation for the EV kit.

Table 1 lists the selectable jumper options.

5) Connect the power-supply positive terminal to the

VIN pad and connect the supply ground to the

PGND pad.

6) Enable the electronic load output and set it to 80mA

current loading.

7) Turn on the power supply and set it to 12V.

8) Verify that VOUT is 3.3V.

9) ꢁemove the shunt from jumper JU1 and verify that

the LDO regulator output (VOUT) is 3.3V.

Table 1. Operation Mode JU1 Functions

For instructions on selecting the feedback resistors for

other output voltages, see the Evaluating Other Output

Voltages section.

SHUNT

LOCATION

LDO/BUCK

MAX5097A

OPERATION MODE

Connected to LDO regulator

BP with ꢁ7 (100mA max)

Open

Connected to Buck Mode regulator

SGND (600mA max)

Installed

_______________________________________________________________________________________

MAX5097A Evaluation Kit

Evluates:MX5097A

Clock Synchronization

Shutdown Control

The MAX5097A EV kit has a jumper to control the shut-

down mode and thus reduce the MAX5097A current

consumption. The 3-pin jumper, JU3, selects the shut-

down mode for the MAX5097A circuit. Table 3 lists the

jumper options.

The MAX5097A EV kit has a PCB pad that enables the

circuit to synchronize with an external TTL square-wave

clock source. The 2-pin jumper, JU2, is provided to

connect the MAX5097A SYNC pin to SGND for noise

immunity. To synchronize the Buck Converter to an

external clock, remove jumper JU2 and connect the

TTL clock to the PCB SYNC pad. JU2 selects the clock

synchronization or internal frequency for the

MAX5097A. Table 2 lists the jumper options.

Table 3. Shutdown JU3 Functions

SHUNT

LOCATION

EV KIT OPERATING

MODE

EN PIN

Connected to Shutdown,

Table 2. Clock JU2 Functions

2-3

1-2

ꢁ5

VOUT = disabled

SHUNT

SYNC

EV KIT

Connected to Enabled,

LOCATION

OPERATING MODE

VIN

VOUT = enabled

Connected to Synchronization mode:

external clock Synchronized to an

Connected to External controller

None

—

an external

controller

determines mode,

enabled = high

source

external clock frequency*

Connected to

SGND

Installed

Internal oscillator, 330kHz

Evaluating Other Output Voltages

*The TTL clock source must provide the following signal qualities:

Output voltage:

The MAX5097A EV kit’s step-down DC-DC converter

output (VOUT) is set to 3.3V by connecting the

MAX5097A ADJ pin to SGND. To generate output volt-

ages other than 3.3V (1.24V to 11V), select different

voltage-divider resistors (ꢁ1, ꢁ2). Additionally, inductor

L1, input and output capacitors C1, C3, and compen-

sation components ꢁ3, C4, and C5 should be evaluat-

ed. ꢁefer to the MAX5097A data sheet for information

on selecting all these components.

• Logic-low = 0 to 0.8V

• Logic-high = 2.0V to 5.5V

Output frequency = 330kHz (synchronization range is

300kHz to 500kHz, refer to the MAX5097A data sheet for

more information)

Minimum pulse: 250ns (min) pulse width (high or low)

Connect the external square-wave clock to the SYNC and SGND

PCB pads.

_______________________________________________________________________________________

MAX5097A Evaluation Kit

VIN

0.22μF

150μF

PGND

50V

22μH

100kΩ

VOUT

LDO/BUCK

VOUT

PGND

LDO/BUCK

22μF

JU1

JU2

SGND

SYNC

PGND

SYNC

SGND

10kΩ

MAX5097A

Evluates:MX5097A

VIN

VOUT

JU3

OUT

ADJ

OPEN

100kΩ

0.047μF

SGND

0Ω

COMP

1.0μF

100kΩ

VOUT

1200pF

22pF

100kΩ

0.01μF

RESET

Figure 1. MAX5097A EV Kit Schematic

_______________________________________________________________________________________

MAX5097A Evaluation Kit

Evluates:MX5097A

Figure 2. MAX5097A EV Kit Component Placement Guide—

Component Side

Figure 3. MAX5097A EV Kit PCB Layout—Component Side

Figure 4. MAX5097A EV Kit PCB Layout—GND Layer 2

_______________________________________________________________________________________

MAX5097A Evaluation Kit

Evluates:MX5097A

Figure 5. MAX5097A EV Kit PCB Layout—VCC Layer 3

Figure 6. MAX5097A EV Kit PCB Layout—Solder Side

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

is a registered trademark of Maxim Integrated Products, Inc.

Janet Freed

MAX5097AEVKIT+ [MAXIM]

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