ISL6420BEVAL1Z Intersil, ISL6420BEVAL1Z Datasheet

ISL6420BEVAL1Z

Manufacturer Part Number

ISL6420BEVAL1Z

Description

EVAL BOARD 1 FOR ISL6420B

Manufacturer

Intersil

Datasheets

1.ISL6420BIAZ-TK.pdf (21 pages)

2.ISL6420BEVAL2Z.pdf (16 pages)

Specifications of ISL6420BEVAL1Z

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current page: 1 of 16
Download datasheet (634Kb)

ISL6420B Evaluation Board User Guide

Hardware Description

The ISL6420B evaluation boards illustrates the operation

of the IC.

The ISL6420B simplifies the implementation of a

complete control and protection scheme for a high

performance DC/DC buck converter. The IC can be

operated with an input voltage range from 4.5V to 5.5V

or 5.5V to 28V. It is designed to drive N-channel

MOSFETs in a synchronous rectified buck topology. The

control, output adjustment, monitoring and protection

functions are all located in a single package.

ISL6420B Reference Design

Two versions of the evaluation board, based on the

package type, are listed in Table 1. Both are configured

for an output voltage of 3.3V and 10A maximum load.

The design criteria is listed in Table 2.

Power and Load Connections

If using an input supply ranging from 5.5V to 28V,

connect the supply to VIN (P1) and GND (P2) posts as

shown in Figure 1. ISL6420B has an internal +5V linear

regulator, which can be used to bias the IC.

When using a 5V ±10% input supply, connect the

negative polarity to GND (P2) post and connect the

positive polarity of the power supply to both VIN (P1)

post and the VCC5 (TP7) post. This will bypass the

internal LDO and the chip will be powered by the input

power supply.

ISL6420BEVAL1Z

ISL6420BEVAL2Z

Output voltage (V

Output current (I

Switching Frequency

November 23, 2009

AN1504.0

BOARD NAME

PAREMETERS

OUT

)

ISL6420BIRZ

ISL6420BIAZ

TABLE 1.

TABLE 2.

1-888-INTERSIL or 1-888-468-3774

20 Ld QFN

20 Ld QSSOP

VALUES

300kHz

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

PACKAGE

3.3V

10A

Application Note 1504

CAUTION: Ensure that the voltage at VCC5 terminal

does not exceed >6V. This can damage the IC.

Start-up

The Power On Reset (POR) function initiates the

soft-start sequence. An internal 10µA current source

charges an external capacitor connected to the ENSS pin

from 0V to 3.3V. When the ENSS pin reaches 1V, the IC is

enabled; the error amplifier reference voltage ramps

from 0V to 0.6V following the slope of the ENSS pin

voltage.

There are two distinct start-up methods for the

ISL6420B. The first method is invoked through the

application of power to the IC. The soft-start feature

allows for a controlled turn-on of the output once the

POR threshold of the input voltage has been reached.

FIGURE 1. POWER AND LOAD CONNECTIONS FOR 5.5V

FIGURE 2. POWER AND LOAD CONNECTIONS FOR

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

Intersil (and design) is a registered trademark of Intersil Americas Inc.

TO 28V INPUT VOLTAGE

5V±10% INPUT VOLTAGE

5V ±10%

5.5V TO 28V

Related parts for ISL6420BEVAL1Z

ISL6420BEVAL1Z Summary of contents

Page 1

... ISL6420B Reference Design Two versions of the evaluation board, based on the package type, are listed in Table 1. Both are configured for an output voltage of 3.3V and 10A maximum load. TABLE 1. BOARD NAME IC ISL6420BEVAL1Z ISL6420BIRZ ISL6420BEVAL2Z ISL6420BIAZ The design criteria is listed in Table 2. TABLE 2. PAREMETERS Output voltage (V ...

Page 2

Figure 3 shows the start-up profile of the regulator in relation to the start-up of the input supply 18V 3.3V OUT V OUT ENSS V IN PHASE FIGURE 3. POWER- The second ...

Page 3

Output Performance Switching Frequency The evaluation board has a 0Ω resistor R9 connecting RT to VCC5 setting the free-running switching frequency to 300kHz. The frequency can be programmed to a different value by removing R9 and populating the R5 location ...

Page 4

V OUT I OUT ENSS FIGURE 11. OVERCURRENT HICCUP MODE A resistor, R (R8), programs the overcurrent trip OCSET level. The PHASE node voltage is compared to the voltage on the OCSET pin while the upper FET is on. A ...

Page 5

Voltage Margining Voltage margining mode is enabled by connecting a margining set resistor (R6) from the VMSET pin to ground. This resistor to ground will set a current, which is switched to the FB pin. The current will be equal ...

Page 6

... VIN. Use of a GND plane in a multilayered board is preferred. 6 Application Note 1504 References For Intersil documents available on the web, see http://www.intersil.com/ [1] ISL6420A Data Sheet, Advanced Single Synchronous Buck Pulse-Width Modulation (PWM) Controller, Intersil Corporation, File No. FN9169. [2] ISL6420B Data Sheet, Advanced Single Synchronous Buck Pulse-Width Modulation (PWM) Controller, File No ...

Page 7

... ISL6420BEVAL1Z Schematic VMSET VMSET REFOUT REFOUT GPIO1 GPIO1 GPIO2 GPIO2 TP3 TP3 TP2 TP2 TP4 TP4 TP5 TP5 2 1 JP2 JP2 2 1 C12 C12 JP1 JP1 2.2uF 2.2uF BAT54C/SOT BAT54C/SOT 330K 330K C4 C4 10uF 10uF 2 1 2.2 2.2 R18 R18 C5 C5 ...

Page 8

... ISL6420BEVAL1Z Rev. A Bill of Materials ID REFERENCE QTY PART NUMBER ISL6420BIRZ BSC059N04LS BSC018N04LS not populate BSS138LT1G BAT54C HC9-3R3-R CAPACITORS C4, C31, C32 3 12 C5, C10, C11, 8 C13, C15, C27, C28, C29 13 C6, C14 C12 1 16 C16 1 17 C17 1 18 C18, C30 2 EEUFC1H221S 19 C19, C20, C21, ...

Page 9

... LED3 1 SSL-LXA3025IGC 37 SW1 1 GT11MSCBE-T 38 P10 Do not populate 39 TP6 Do not populate ISL6420BEVAL1Z Printed Circuit Board Layers FIGURE 17. ISL6420BEVAL1Z - TOP LAYER (SILKSCREEN) 9 Application Note 1504 (Continued) PART TYPE DESCRIPTION Resistor, Film 0Ω, 1/10W Resistor, Film 2.2Ω, 1%, 1/10W Resistor, Film 4.7kΩ,1%,1/10W ...

Page 10

... ISL6420BEVAL1Z Printed Circuit Board Layers FIGURE 18. ISL6420BEVAL1Z - TOP LAYER (COMPONENT SIDE) 10 Application Note 1504 FIGURE 19. ISL6420BEVAL1Z - LAYER 2 FIGURE 20. ISL6420BEVAL1Z - LAYER 3 (Continued) AN1504.0 November 23, 2009 ...

Page 11

... ISL6420BEVAL1Z Printed Circuit Board Layers FIGURE 21. ISL6420BEVAL1Z - BOTTOM LAYER (SOLDER SIDE) FIGURE 22. ISL6420BEVAL1Z - BOTTOM LAYER (SILKSCREEN) 11 Application Note 1504 (Continued) AN1504.0 November 23, 2009 ...

Page 12

ISL6420BEVAL2Z Schematic GPIO1 GPIO1 GPIO2 GPIO2 TP2 TP2 TP4 TP4 TP5 TP5 TP3 TP3 REFOUT REFOUT VMSET VMSET 2 1 JP2 JP2 2 1 C12 C12 JP1 JP1 2.2uF 2.2uF BAT54C/SOT BAT54C/SOT 330K 330K ...

Page 13

... Resistor, Film 2.55kΩ, 1%, 1/10W Resistor, Film 330kΩ, 1%, 1/10W Resistor, Film 10kΩ, 1%, 1/10W Resistor, Film 1.27kΩ,1%,1/10W PACKAGE VENDOR 20 Ld Intersil QSOP SuperSO8 Infineon SuperSO8 Infineon On Semi SOT23 Fairchild SMD Coiltronics SM_0603 Various SM_0603 Various ...

Page 14

ISL6420BEVAL2Z Rev. A Bill of Materials ID REFERENCE QTY PART NUMBER 28 R9, R11, R12, 6 R13, R14, R16 29 R15, R17, R18 3 30 R20, R21 not populate OTHERS 1514-2 ...

Page 15

ISL6420BEVAL2Z Printed Circuit Board Layers FIGURE 24. ISL6420BEVAL2Z - TOP LAYER (COMPONENT SIDE) 15 Application Note 1504 FIGURE 25. ISL6420BEVAL2Z - LAYER 2 FIGURE 26. ISL6420BEVAL2Z - LAYER 3 (Continued) AN1504.0 November 23, 2009 ...

Page 16

... FIGURE 27. ISL6420BEVAL2Z - BOTTOM LAYER (SOLDER SIDE) FIGURE 28. ISL6420AEVAL2Z - BOTTOM LAYER (SILKSCREEN) 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. ...

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