Intersil ISL85001EVAL1Z Istruzioni per l'installazione e il funzionamento

®ISL85001EVAL1Z: 1A

Regulator Standard Buck PWM

Description

The ISL85001EVAL1Z REV A kit is intended for use by

individuals with requirements for Point-of-Load applications

sourcing from 4.5V to 25V. The ISL85001EVAL1Z evaluation

board is used to demonstrate the performance of the

ISL85001 standard buck regulator.

The ISL85001 is offered in a 4mmx3mm 12 Ld DFN package

with 1mm maximum height. The complete converter

occupies less than 0.425in2area.

Features

• Standard Buck Controller with Integrated Switching Power

MOSFET

• Integrated Boot Diode

• Input Voltage Range

- Fixed 5V ±10%

- Variable 5.5V to 25V

• PWM Output Voltage Adjustable from 0.6V to 19V with

Continuous Output Current up to 1A

• Voltage Mode Control with Voltage Feed-Forward

• Fixed 500kHz Switching Frequency

• Externally Adjustable Soft-Start Time

• Output Undervoltage Protection

• Enable Inputs

• PGOOD Output

• Overcurrent Protection

• Thermal Overload Protection

• Internal 5V LDO regulator

Applications

• General Purpose

• WLAN Cards-PCMCIA, Cardbus32, MiniPCI

Cards-Compact Flash Cards

• Hand-Held Instruments

• LCD Panel

• Set-top Box

What’s Inside

The Evaluation Board Kit contains the following materials:

• The ISL85001 EVAL REV A board

• The ISL85001 datasheet

• This EVAL KIT document

Recommended Equipment

The Following Materials are Recommended to Perform

Testing:

• 0V to 25V Power Supply with at Least 5A Source Current

Capability, Battery, Notebook AC Adapter

• One Electronic Load Capable of Sinking Current up to 5A

• Digital Multimeters (DMMs)

• 100MHz Quad-Trace Oscilloscope

• Signal Generator

Quick Setup Guide

1. Ensurethatthecircuitiscorrectlyconnectedtothesupply

and loads prior to applying any power.

2. Connect the bias supply to VIN, the plus terminal to TP1

(VIN) and the negative return to TP2 (GND).

3. Verify that SW1 is on ENABLE.

4. Turn on the power supply.

5. Verify the PG is on and the output voltage is 2.5V for

VOUT(TP3).

Evaluating the Other Output Voltage

The ISL85001EVAL kit outputs are preset to 2.5V; however,

it can be programmed using resistor dividers using

Equation 1:

The output voltage programming resistor R2will depend on

on the feedback resistor R1, as referred to in Figure 1. The

value of R1is typically between 1kΩand 10kΩ. If the output

voltage desired is 0.6V, then R2is left opened.

TABLE 1. SWITCH 1 SETTINGS

SW1 ENABLE OPERATING MODE

1 SW1 Enable or disable the buck controller

R2R10.6V⋅

VOUT 0.6V–

----------------------------------

=(EQ. 1)

0.6V

REFERENCE

VOUT

FIGURE 1. EXTERNAL RESISTOR DIVIDER

December 1, 2008

AN1443.0Application Note

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774 |Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

2AN1443.0

December 1, 2008

ISL85001EVAL1Z Schematic

POPULATE R30 IF VIN <6V ONLY

OFF

TP4

47UF

470PF

10K

220UF

1UF

0.1UF

COMP

ISL8500IRZ

VIN

GND

10UF

47PF

OPEN

10K

2.43K

VOUT

2N7002

ON EN

100K

VIN

VDD

PHASE

OPEN

3.16K

0.1UF

301

2200PF

BOOT

30K

C10

TP3

TP1

TP2

C11

SW1 2

C20

R30

R12

TP16

TP13

C21

C13

C12

R20

R21

SP1

SP2

COMP

GND

VIN

PHASE

BOOT

VDD

Application Note 1443

3AN1443.0

December 1, 2008

ISL85001EVAL1Z Bill of Materials

PART NUMBER QTY UNITS REFERENCE

DESIGNATOR DESCRIPTION MFR MANUFACTURER

PART

ISL85001EVAL1ZREVAPCB 1 ea See Label-Rename

Board PWB-PCB,

ISL85001EVAL1Z, REVA,

ROHS

TITAN ISL85001EVAL1ZREVAPCB

C1608X7R1H104K-T 1 ea C9 CAPACITOR, SMD, 0603,

0.10µF, 50V, 10%, X7R TDK C1608X7R1H104K

H1044-00104-16V10-T 1 ea C4 CAP, SMD, 0402, 0.1µF, 16V,

10%, X7R, ROHS MURATA GRM36X7R104K016AD

H1044-00222-50V10-T 1 ea C1 CAP, SMD, 0402, 2200pF,

50V, 10%, X7R, ROHS PANASONIC ECJ-0EB1H222K

H1044-00470-50V5-T 1 ea C2 CAP, SMD, 0402, 47pF, 50V,

5%, NPO, ROHS MURATA GRM36COG470J050AQ

H1044-00471-50V10-T 1 ea C3 CAP, SMD, 0402, 470pF, 50V,

10%, X7R, ROHS PANASONIC ECJ-0EB1H471K

H1045-00105-6R3V10-T 1 ea C8 CAP, SMD, 0603, 1µF, 6.3V,

10%, X5R, ROHS PANASONIC ECJ1VB0J105K

H1065-00106-25V10-T 1 ea C10 CAP, SMD,1206,10µF, 25V,

10%, X5R, ROHS VENKEL C1206X5R250-106KNE

H1082-00476-16V20-T 1 ea C12 CAP, SMD, 1210, 47µF, 16V,

20%, x5R, ROHS TDK C3225X5R1C476M

IHLP2525CZER220M11 1 ea L1 COIL-PWR INDUCTOR,

SMD, 6.9x6.5, 22µH, 20%,

7A, ROHS

VISHAY IHLP2525CZER220M11

131-4353-00 2 ea SP1, SP2 CONN-SCOPEPROBETEST

PT, COMPACT, PCB MNT,

ROHS

TEKTRONIX 131-4353-00

1514-2 4 ea TP1 to TP4 CONN-TURRET, TERMINAL

POST, TH, ROHS KEYSTONE 1514-2

5002 2 ea TP13, TP16 CONN-MINI TEST POINT,

VERTICAL, WHITE, ROHS KEYSTONE 5002

B340LB-13-F-T 1 ea D1 DIODE-SCHOTTKY, SMD,

SMB, 2P, 40V, 3A LOW VF,

ROHS

DIODES INC. B340LB-13-F

LTST-C170CKT 1 ea D3 LED-GaAs RED, SMD,

2x1.25mm,100mW, 40mA,

10mcd, ROHS

LITEON/VISHA

YLTST-C170CKT

ISL85001IRZ 1 ea U1 IC-2A BUCK REGULATOR,

12P, DFN, 4x3, ROHS INTERSIL ISL85001IRZ

2N7002-7-F-T 1 ea Q4 TRANSISTOR, N-CHANNEL,

3LD, SOT-23, 60V, 115mA,

ROHS

DIODES,INC. 2N7002-7-F

H2510-01002-1/16W1-T 1 ea R2 RES,SMD, 0402, 10k,1/16W,

1%, TF, ROHS PANASONIC ERJ-2RKF1002

H2510-01003-1/16W1-T 1 ea R12 RES, SMD, 0402, 100k,

1/16W, 1%, TF, ROHS PANASONIC ERJ2RKF1003

H2510-03002-1/16W1-T 1 ea R1 RES,SMD, 0402, 30k,1/16W,

1%, TF, ROHS YAGEO RC0402FR-0730KL

H2510-03010-1/16W1-T 1 ea R3 RES, SMD, 0402, 301Ω,

1/16W, 1%, TF, ROHS PANASONIC ERJ-2RKF3010X

Application Note 1443

4AN1443.0

December 1, 2008

H2510-03161-1/16W1-T 1 ea R4 RES, SMD, 0402, 3.16k,

1/16W, 1%, TF, ROHS VENKEL CR0402-16W-3161FT

H2511-01002-1/10W1-T 1 ea R21 RES, SMD, 0603,10k, 1/10W,

1%, TF, ROHS KOA RK73H1JT1002F

H2511-02431-1/10W1-T 1 ea R20 RES, SMD, 0603, 2.43k,

1/10W, 1%, TF, ROHS VENKEL CR0603-10W-2431FT

H2511-DNP 0 ea R30 RES, SMD, 0603, DNP-

PLACE HOLDER, ROHS

GT11MSCBE-T 1 ea SW1 SWITCH-TOGGLE, SMD,

ULTRAMINI, 1P, SPST MINI C&K

COMPONENTS GT11MSCKE

4-40x1/2-SCREW 4 ea Four corners SCREW, 4-40x1/2in, PAN,

NYLON, PHILLIPS, ROHS

4-40x3/4-STANDOFF 4 ea Four corners STANDOFF, 4-40x3/4in, F/F,

HEX, NYLON KEYSTONE 1902D

5x8-STATIC-BAG 1 ea Place assy in bag. BAG, STATIC, 5x8, ZIP LOC INTERSIL 212403-013

DNP 0 ea C11, C13, C20, C21 DO NOT POPULATE OR

PURCHASE

LABEL-RENAME BOARD 1 ea RENAME PCB TO:

ISL85001EVAL1Z LABEL, TO RENAME BRD

LABEL-SERIAL NUMBER 1 ea LABEL, FOR SERIAL

NUMBER AND BOM REV #

ISL85001EVAL1Z Bill of Materials(Continued)

PART NUMBER QTY UNITS REFERENCE

DESIGNATOR DESCRIPTION MFR MANUFACTURER

PART

Application Note 1443

5AN1443.0

December 1, 2008

ISL85001EVAL1Z Board Layout

FIGURE 2. TOP COMPONENTS

FIGURE 3. TOP LAYER ETCH

ISL85001EVAL1Z

Application Note 1443

Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to

verify that the Application Note or Technical Brief is current before proceeding.

For information regarding Intersil Corporation and its products, see www.intersil.com

AN1443.0

December 1, 2008

FIGURE 4. BOTTOM LAYER COMPONENTS (MIRRORED)

FIGURE 5. BOTTOM LAYER ETCH (MIRRORED)

ISL85001EVAL1Z Board Layout (Continued)

Application Note 1443

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