Intersil ISL8014AEVAL2Z Installation and operating instructions

Application Note 1366

ISL8014AEVAL2Z: 4A Low Quiescent Current 1MHz

High Efficiency Synchronous Buck Regulator

Description

The ISL8014AEVAL2Z kit is intended for use by

individuals with requirements for Point-of-Load

applications sourcing from 2.7V to 5.5V. The

ISL8014AEVAL2Z evaluation board demonstrates the

performance of the ISL8014A low quiescent current

mode converter.

The ISL8014A is offered in a 4mmx4mm 16 Ld QFN

package with 1mm maximum height. The ISL8014A is

pin-to-pin compatible to the ISL8013A. The complete

converter occupies less than 0.4in2area.

Key Features

• High Efficiency Synchronous Buck Regulator with up

to 95% Efficiency

• Power-Good (PG) Output with 1ms Delay

• 2.7V to 5.5V Supply Voltage

• 3% Output Accuracy Over-Temperature/Load/Line

• 4A Guaranteed Output Current

• Start-up with Pre-biased Output

• Internal Digital Soft-Start - 1ms

• Soft-Stop Output Discharge During Disabled

• 35µA Quiescent Supply Current in PFM Mode

• Selectable Forced PWM Mode and PFM Mode

• External Synchronization up to 4MHz

• Less than 1µA Logic Controlled Shutdown Current

• 100% Maximum Duty Cycle for Lowest Dropout

• Internal Current Mode Compensation

• Peak Current Limiting and Hiccup Mode Short Circuit

Protection

• Over-Temperature Protection

Recommended Equipment

The following materials are recommended to perform

testing:

• 0V to 10V Power Supply with at least 5A Source

Current Capability or 5V Battery

• Electronic Loads Capable of Sinking Current Up to 5A

• Digital Multimeters (DMMs)

• 100MHz Quad-trace Oscilloscope

• Signal Generator

Quick Setup Guide

1. Ensure that the circuit is correctly connected to the

supply and loads prior to applying any power.

2. Connect the bias supply to VIN. Plus terminal to P4

(VIN) and negative return to P5 (GND).

3. Verify that position is ON for SW1.

4. Turn on the power supply.

5. Verify the output voltage is 1.8V for VOUT

Evaluating the Other Output Voltage

The ISL8014AEVAL2Z kit output is preset to 1.8V;

however, output voltages can be adjusted from 0.8V to

3.3V using Equations 1 and 2:

Let’s set R1 = 124kΩ

Note: If desired output is 0.8V, then short R1and open

R2.

Mode Control

The ISL8014A has a SKIP pin that controls the operation

mode. When the SKIP pin is driven to low or shorted to

ground, the regulator operates in a PFM mode. Set SKIP

pin high forced PWM mode. The controller remains in the

fixed PWM frequency at light load instead of entering the

skip mode. In an application where situations require the

ISL8014A regulator to sink more than 2A valley inductor

current, it is recommended to operate in PFM to avoid

any possible over stress.

TABLE 1. SWITCH 1 SETTINGS

SW1 ENABLE ON/OFF CONTROL

1OFFDisableV

OUT

3ONEnableV

OUT

SW2 SKIP FUNCTION

1 PWM Fixed PWM frequency at light load

3 PFM Force continuous mode

VOUT 0.8 1 R1

-------

⎝⎠

⎜⎟

⎛⎞

=(EQ. 1)

R2R1

()

VOUT

0.8

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

⎝⎠

⎛⎞

1–

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

=(EQ. 2)

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.

December 16, 2009

AN1366.3

2AN1366.3

December 16, 2009

ISL8014AEVAL2Z Schematic

VIN

OFFPFM

PWM

SW2

SW1

VIN

VDD

VIN

31 2N7002

PG1

100k

SYNCH

P2 1

OPEN

VIN

100k

EN 1

P6 2

OPEN

3ON

22µF C2

22µF

EN PG

SYNCH

VIN

SYNCH

PGND

SGND

1.5µH

124k

47pF

22µF

100k

22µF

NC LX LX NC

VOUT

578

13141516

NC FB

OPEN2

R10

NOTE: Pins 13 and 16 are no connect pins which can tie to VIN, SGND, or LX.

Recommend connecting pin 13 to LX for compatibility to ISL8013.

ISL8014AIRZ

Application Note 1366

3AN1366.3

December 16, 2009

ISL8014AEVAL2Z Bill of Materials

PART NUMBER QTY REFERENCE

DESIGNATOR DESCRIPTION MANUFACTURER MANUFACTURER PART

ISL8014AEVAL2Z 1 PWB-PCB, ISL8014AEVAL2Z,

REVA, ROHS ISL8014AEVAL2ZREVAPCB

H1045-00470-50V5-T 1 C4 CAP, SMD, 0603, 47pF, 50V, 5%,

NPO, ROHS AVX 06035A470JAT2A

PHILLIPS 0603X7R500-562KNE

H1045-DNP 0 C3 CAP, SMD, 0603, DNP-PLACE

HOLDER, ROHS

H1065-00226-6R3V10-T 4 C1, C2, C5, C6 CAP, SMD, 1206, 22µF, 6.3V,

10%, X5R, ROHS MURATA GRM31CR60J226KE19L

KEMET C1206C226K9PACTU

AVX 12066D226KAT2A

DR73-1R5-R 1 L1 COIL-PWR INDUCTOR, SMD,

7.5mm, 1.5µH, 20%, 6.52A,

ROHS

COOPER ELECTRONIC

TECH. DR73-1R5-R

131-4353-00 2 J1, J2 CONN-SCOPE PROBE TEST PT,

COMPACT, PCB MNT, ROHS TEKTRONIX 131-4353-00

1514-2 4 P4, P5, P7, P8 CONN-TURRET, TERMINAL POST,

TH, ROHS KEYSTONE 1514-2

5002 3 P2, P3, P6 CONN-MINI TEST POINT,

VERTICAL, WHITE, ROHS KEYSTONE 5002

LTST-C170CKT 1 D1 LED-GaAs RED, SMD,

2mmx1.25mm, 100mW, 40mA,

10mcd, ROHS

LITEON/VISHAY LTST-C170CKT

ROHM SML-210LTT86

STANLEY ELECTRIC BR112H-TR

ISL8014AIRZ 1 U1 IC-4A, 1MHz, BUCK REGULATOR,

16P, QFN, 4x4, ROHS INTERSIL ISL8014AIRZ

2N7002-7-F-T 1 Q1 TRANSISTOR, N-CHANNEL, 3LD,

SOT-23, 60V, 115mA, ROHS DIODES, INC. 2N7002-7-F

ON SEMICONDUCTOR 2N7002LT1G

H2511-00R00-1/10W-T 1 R10 RESISTOR, SMD, 0603, 0Ω,

1/10W, TF, ROHS

H2511-01003-1/10W1-T 4 R2, R4, R6, R7 RES, SMD, 0603, 100k, 1/10W,

1%, TF, ROHS

H2511-01243-1/10W1-T 1 R1 RES, SMD, 0603, 124k, 1/10W,

1%, TF, ROHS YAGEO 9C06031A1243FKHFT

PANASONIC ERJ-3EK1243V

H2511-02001-1/10W1-T 1 R5 RES, SMD, 0603, 2k, 1/10W, 1%,

TF, ROHS KOA RK73H1JTTD2001F

VENKEL CR0603-10W-2001FT

H2511-DNP 0 R8, R9 RES, SMD, 0603, DNP-PLACE

HOLDER, ROHS

GT11MSCBE-T 2 SW1, SW2 SWITCH-TOGGLE, SMD,

ULTRAMINI, 1P, SPST MINI C&K COMPONENTS GT11MSCKE

LABEL-SERIAL NUMBER 1 LABEL, FOR SERIAL NUMBER

AND BOM REV #

Application Note 1366

4AN1366.3

December 16, 2009

ISL8014AEVAL2Z Board Layout

FIGURE 1. TOP COMPONENTS

FIGURE 2. TOP LAYER ETCH

ISL8014AEVAL2Z

Application Note 1366

5AN1366.3

December 16, 2009

FIGURE 3. 2ND LAYER ETCH

FIGURE 4. 3RD LAYER ETCH

ISL8014AEVAL2Z Board Layout (Continued)

Application Note 1366

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

AN1366.3

December 16, 2009

FIGURE 5. BOTTOM LAYER COMPONENTS (MIRRORS)

FIGURE 6. BOTTOM LAYER ETCH (MIRROR)

ISL8014AEVAL2Z Board Layout (Continued)

Application Note 1366

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