MAX1534EVKIT [MAXIM]

Evaluation Kit for the MAX1534 ; 评估板MAX1534\n


型号：	MAX1534EVKIT
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Evaluation Kit for the MAX1534 评估板MAX1534\n
文件：	总5页 (文件大小：148K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-2700; Rev 0; 12/02

MAX1534 Evaluation Kit

General Description

Features

The MAX1534 evaluation kit (EV kit) is a fully assembled

and tested surface-mount circuit board that demon-

strates the MAX1534 triple-output keep-alive power sup-

ply IC. The MAX1534 integrates one high-performance

step-down converter and two low-dropout regulators

(LDOs). The step-down converter is configured for 5.0V

and provides up to 500mA. The first and second LDOs

are configured for 3.3V and 1.8V at currents up to

160mA each. Power management functions include an

accurate shutdown input and power-OK (POK) output.

The EV kit also allows for adjustable output voltages by

including extra pads for feedback resistors.

ꢀ Triple-Output Power Supply

5.0V at 500mA (typ)

3.3V at 160mA

1.8V at 160mA

ꢀ Integrated Power MOSFETs

ꢀ 4.5V to 24V Input Supply Range

ꢀ Adjustable Inductor Current Limit

ꢀ Fixed or Adjustable Outputs

ꢀ Power-OK (POK) Output

ꢀ 3.5µA Shutdown Supply Current (typ)

ꢀ Surface-Mount Construction

ꢀ Fully Assembled and Tested

Ordering Information

PART

TEMP RANGE IC PACKAGE

MAX1534EVKIT

0°C to +70°C 16 Thin QFN 4mm × 4mm

Component List

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

15µH% 1A inductoꢄ

Sumida CDꢃH6D38-150

10µF 20ꢀ% 25ꢁ ꢂ7ꢃ ceꢄamic

capacitoꢄ (1812)

TDK C4532ꢂ7ꢃ1E106M

ꢃ1–ꢃ6

ꢃ7

Not installed (0603)

100kΩ 5ꢀ ꢄesistoꢄ (0603)

Not installed (2010)

47µF 20ꢀ% 6.3ꢁ ꢂ5ꢃ ceꢄamic

capacitoꢄ (1210)

TDK C3225ꢂ5ꢃ0J476M

ꢃ8% ꢃ9

ꢃ10% ꢃ11

JU1% JU2

JU3

Not installed (0805)

Jumpeꢄs% SIP-3% 3-pin headeꢄs (SIP-3)

Not installed (SIP-3)

2.2µF 20ꢀ% 10ꢁ ꢂ5ꢃ ceꢄamic

capacitoꢄs (0805)

TDK C2012ꢂ5ꢃ1A225M

C3% C5% C6

JU4

Jumpeꢄ% 2 × 3 pin headeꢄ

MAꢂ1534ETE (16-pin thin QFN)

Shunts

0.01µF 20ꢀ% 25ꢁ ꢂ7ꢃ ceꢄamic

capacitoꢄ (0402)

TDK C1005ꢂ7ꢃ1E103M

None

MAꢂ1534 PC boaꢄd

1A% 30ꢁ% Schottky diode (SMA)

Nihon EP10QY03

Component Suppliers

SUPPLIER

PHONE

FAX

WEBSITE

www.niec.co.jp

Nihon

Sumida

TDK

81-33343-3411

847-545-6700

847-803-6100

81-33342-5407

847-545-6720

847-390-4405

www.sumida.com

www.component.tdk.com

Note: Please indicate that you are using the MAX1534 when contacting these component suppliers.

________________________________________________________________ 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.

MAX1534 Evaluation Kit

nal feedback netwoꢄk. The MAꢂ1534 also featuꢄes two

additional inteꢄnal LDOs that aꢄe set to 1.8ꢁ and 3.3ꢁ

with output cuꢄꢄents of 160mA each. The outputs of the

buck conveꢄteꢄ and the LDO ꢄegulatoꢄs can be adjust-

ed by adding feedback ꢄesistoꢄs ꢃ1 thꢄough ꢃ6. Foꢄ

instꢄuctions on adjusting the output voltage% see the

Adjusting the Output Voltages section.

Quick Start

Recommended Equipment

• One vaꢄiable DC poweꢄ supply capable of supplying

between 4.5ꢁ and 24ꢁ at 1A

• Five voltmeteꢄs

Procedure

The MAꢂ1534 Eꢁ kit is fully assembled and tested.

Follow the steps below to veꢄify boaꢄd opeꢄation. Do

not turn on the power supply until all connections

are completed:

The default configuꢄation of the MAꢂ1534 Eꢁ kit dꢄives

the input to the LDOs with the output of the buck con-

veꢄteꢄ (OUT3). If the output of the buck conveꢄteꢄ

(OUT3) is configuꢄed loweꢄ than the outputs of the

LDOs (OUT1 oꢄ OUT2)% LDOIN must be dꢄiven by a

sepaꢄate souꢄce (see Using an Alternative LDO Source

Supply).

1) Set the vaꢄiable DC poweꢄ supply to any voltage

between 4.5ꢁ and 24ꢁ.

2) Ensuꢄe that the vaꢄiable DC poweꢄ supply is tuꢄned

off.

Shutdown Control

The MAꢂ1534 has an active-low shutdown contꢄol input

that enables/disables all thꢄee poweꢄ outputs. Jumpeꢄ

JU1 selects the ciꢄcuit opeꢄating modes: shutdown oꢄ

noꢄmal opeꢄation. ꢃemove the shunt when dꢄiving SHDN

with an exteꢄnal signal. See Table 1 foꢄ shunt positions.

3) Ensuꢄe that shunts aꢄe placed acꢄoss pins 1-2 of

jumpeꢄs JU1 and JU2.

4) Ensuꢄe that a shunt is placed acꢄoss pins 3-4 of

jumpeꢄ JU4.

The MAꢂ1534 Eꢁ kit can be pꢄogꢄammed to shut down

5) Connect a voltmeteꢄ acꢄoss the IN pad and the

GND pad (located beside the OUT3 pad) to monitoꢄ

the input voltage.

Table 1. Shutdown Selection

6) Connect a voltmeteꢄ acꢄoss the OUT1 pad and the

GND pad (located beside the OUT1 pad) to monitoꢄ

the OUT1 voltage (3.3ꢁ).

SHUNT

POSITION

JUMPER

SHDN PIN

DESCRIPTION

MAꢂ1534 outputs

7) Connect a voltmeteꢄ acꢄoss the OUT2 pad and the

GND pad (located beside the LDOIN pad) to moni-

toꢄ the OUT2 voltage (1.8ꢁ).

Connected

to IN

enabled. POK is high

impedance when all

outputs aꢄe in ꢄegulation.

JU1

1-2*

8) Connect a voltmeteꢄ acꢄoss the OUT3 pad and the

GND pad (located below the OUT3 pad) to monitoꢄ

the OUT3 voltage (5.0ꢁ).

MAꢂ1534 outputs

disabled. POK is low

impedance.

Connected

to GND

JU1

2-3

9) Connect a voltmeteꢄ acꢄoss the POK pad and the

GND pad (located above the LDOIN pad) to moni-

toꢄ the POK voltage.

*Default configuration: JU1 (1-2).

10) Tuꢄn on the vaꢄiable DC poweꢄ supply.

11) ꢁeꢄify that the voltage at OUT1 is 3.3ꢁ.

12) ꢁeꢄify that the voltage at OUT2 is 1.8ꢁ.

13) ꢁeꢄify that the voltage at OUT3 is 5.0ꢁ.

14) ꢁeꢄify that the voltage at POK is 5.0ꢁ.

when the input voltage dꢄops below a desiꢄed minimum

voltage (ꢁ ) by installing ꢄesistoꢄs ꢃ10 and ꢃ11%

and ꢄemoving the shunt on JU1. Calculate these ꢄesistoꢄ

values using the following equation:

IN(MIN)

ꢁ





IN MIN

(

)

ꢃ11 = ꢃ10

−1





ꢁ

SHDN





Detailed Description

The MAꢂ1534 Eꢁ kit pꢄovides multiple output voltages

(5.0ꢁ% 3.3ꢁ% and 1.8ꢁ) fꢄom a 4.5ꢁ to 24.0ꢁ input. The

buck-conveꢄteꢄ section of the Eꢁ kit deliveꢄs up to

500mA and opeꢄates up to 100ꢀ duty cycle. The Eꢁ kit

utilizes the MAꢂ1534 IC% and the ciꢄcuit ꢄegulates the

buck conveꢄteꢄ output voltage to 5.0ꢁ without an exteꢄ-

wheꢄe:

ꢁ

SHDN

= 1.0ꢁ

ꢃ10 = 100kΩ

= desiꢄed minimum input voltage

ꢁ

IN(MIN)

_______________________________________________________________________________________

MAX1534 Evaluation Kit

Adjustable Inductor Current Limit

The MAꢂ1534 Eꢁ kit can opeꢄate at diffeꢄent cuꢄꢄent

limits. Jumpeꢄ JU2 selects the MAꢂ1534’s maximum

inteꢄnal switch cuꢄꢄent limit. The Eꢁ kit’s default setting

allows a maximum 1000mA inteꢄnal switch cuꢄꢄent. To

change the switch cuꢄꢄent limit to 500mA% move the

shunt on jumpeꢄ JU2 to pins 2-3. Changing the cuꢄꢄent

limit ꢄequiꢄes inductoꢄ L1 and output capacitoꢄ C2 to be

ꢄeplaced. ꢃefeꢄ to the ꢃecommended Components

table in the MAꢂ1534 data sheet. ꢃemove the shunt

when dꢄiving ILIM with an exteꢄnal signal. See Table 2

foꢄ shunt positions.

Table 4. PRESET Shunt Positions

SHUNT

POSITION

PRESET

JUMPER

DESCRIPTION

Connected Adjustable output

JU3

1-2

to IN

mode

Connected

to GND

JU3

2-3*

Fixed output mode

*Default configuration: JU3 (2-3) shorted by PC board trace.

between pins 2-3 of JU3% shoꢄting pins 1-2 of JU3% and

installing ꢄesistoꢄs ꢃ1 thꢄough ꢃ6. ꢃefeꢄ to the instꢄuctions

below foꢄ ꢄesistoꢄ selection. See Table 4 foꢄ PRESET

shunt positions.

Table 2. Inductor Current-Limit Selection

INDUCTOR

CURRENT LIMIT

(mA)

SHUNT

POSITION

JUMPER

ILIM PIN

To adjust the output voltages of the MAꢂ1534 Eꢁ kit%

follow the diꢄections below:

Connected

to IN

1) Cut the tꢄace between pins 2 and 3 of jumpeꢄ JU3.

2) Install a 3-pin headeꢄ in position JU3.

JU2

1-2*

2-3

1000

500

Connected

to GND

3) Place a shunt acꢄoss pins 1 and 2 of jumpeꢄ JU3.

4) Cut the tꢄace between the pads of ꢄesistoꢄ ꢃ1% ꢃ4%

and ꢃ6.

*Default configuration: JU2 (1-2).

5) Install ꢄesistoꢄs in locations ꢃ1 thꢄough ꢃ6 (the

ꢄesistoꢄ values aꢄe calculated using the following

equations).

Selecting the POK Active-High Output

Voltage

The POK pin of the MAꢂ1534 indicates the status of the

output voltages. Monitoꢄ this voltage at the POK pad.

The POK pin is pulled up with a 100kΩ ꢄesistoꢄ thꢄough

jumpeꢄ JU4 to one of the thꢄee outputs. See Table 3 foꢄ

shunt positions.

To set the output voltage on OUT1% choose ꢃ3 as follows:





ꢁ

OUT1

ꢃ3 = ꢃ4 ×

−1









FB1

Table 3. POK Output Selection

wheꢄe:

ꢁ

= desiꢄed output voltage at OUT1 (fꢄom 1ꢁ to

OUT1

LDOIN)

SHUNT

POSITION

JUMPER

DESCRIPTION

ꢁ

= 1.00ꢁ

FB1

POK pin pulled up to OUT2

(1.8ꢁ default)

JU4

1-2

ꢃ4 = 100kΩ

To set the output voltage on OUT2% choose ꢃ5 as follows:

POK pin pulled up to OUT3

(5.0ꢁ default)

JU4

3-4*

5-6





ꢁ

OUT2

ꢃ5 = ꢃ6 ×

−1





POK pin pulled up to OUT1

(3.3ꢁ default)

ꢁ





FB2

JU4

wheꢄe:

*Default configuration: JU4 (3-4).

ꢁ

= desiꢄed output voltage at OUT2 (fꢄom 1ꢁ to

OUT2

LDOIN)

Adjusting the Output Voltages

The MAꢂ1534 Eꢁ kit ciꢄcuit is configuꢄed to ꢄegulate the

output voltages to pꢄeset values by connecting the

PRESET pin to gꢄound. The outputs can be adjusted to

diffeꢄent voltages by cutting open the PC boaꢄd shoꢄt

ꢁ

= 1.00ꢁ

FB2

ꢃ6 = 100kΩ

_______________________________________________________________________________________

MAX1534 Evaluation Kit

OUT1

2.2µF

GND

R11

10µF

GND

OPEN

SHDN

JU1

FB1

SHDN

SHORT

(PC TRACE)

ILIM

JU2

R10

OPEN

MAX1534

OUT2

GND

OUT2

FB2

ILIM

JU3

SHORT

(PC TRACE)

PRESET

2.2µF

OPEN

SHORT

LDOIN

(PC TRACE)

PULLUP

SHORT

(PC TRACE)

LDOIN

OUT3

2.2µF

JU4

OUT2

PULLUP

OUT1

SHORT

15µH

OUT3

(PC TRACE)

OUT3

GND

PULLUP

100kΩ

POK

47µF

POK

SHORT

(PC TRACE)

FB3

0.01µF

GND

OPEN

Figure 1. MAX1534 EV Kit Schematic

To set the output voltage on OUT3% choose ꢃ1 as follows:

Using an Alternative LDO Source Supply

The buck-conveꢄteꢄ output (OUT3) is the default poweꢄ

souꢄce foꢄ the two LDOs. If the output voltages at eitheꢄ

OUT1 oꢄ OUT2 aꢄe ꢄeconfiguꢄed foꢄ a voltage gꢄeateꢄ

than OUT3% the input to the MAꢂ1534 inteꢄnal LDOs

must be dꢄiven by an exteꢄnal souꢄce. To dꢄive the

LDOs with an exteꢄnal souꢄce% follow the diꢄections

below:





ꢁ

OUT3

ꢃ1= ꢃ2 ×

−1









FB3

wheꢄe:

ꢁ

OUT3

= desiꢄed output voltage at OUT3 (fꢄom 1ꢁ to IN)

ꢁ

FB3

= 1.00ꢁ

1) Cut the PC boaꢄd tꢄace shoꢄting the pads of ꢄesistoꢄ

ꢃ8.

ꢃ2 = 100kΩ

Note: If OUT3 is set higheꢄ than 5.5ꢁ% OUT3 must be

disconnected fꢄom LDOIN and POK.

2) Connect an exteꢄnal 0.5A souꢄce to the pads

maꢄked LDOIN and GND.

The voltage at OUT3 must be at least 240mꢁ higheꢄ

than the voltages at OUT1 and OUT2. If the voltage at

OUT3 is loweꢄ than eitheꢄ of the voltages at OUT1 and

OUT2% the input to the LDOs must be dꢄiven by a sepa-

ꢄate poweꢄ souꢄce (see Using an Alternative LDO

Source Supply section).

3) Ensuꢄe that the exteꢄnal souꢄce is gꢄeateꢄ than 2.5ꢁ%

at least 240mꢁ higheꢄ than OUT1 oꢄ OUT2

(whicheveꢄ is gꢄeateꢄ)% and does not exceed 5.5ꢁ.

Note: Adjustable opeꢄation may ꢄequiꢄe ꢄeplacement of

capacitoꢄs with higheꢄ voltage ꢄatings.

Note: Do not pull up POK above LDOIN.

_______________________________________________________________________________________

MAX1534 Evaluation Kit

Figure 2. MAX1534 EV Kit Component Placement Guide—

Component Side

Figure 3. MAX1534 EV Kit PC Board Layout—Component Side

Figure 4. MAX1534 EV Kit PC Board Layout—Solder Side

Figure 5. MAX1534 EV Kit Component Placement Guide—

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.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5

Pꢄinted USA

is a ꢄegisteꢄed tꢄademaꢄk of Maxim Integꢄated Pꢄoducts.

MAX1534EVKIT [MAXIM]

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