ISL85033EVAL2Z Intersil, ISL85033EVAL2Z Datasheet

ISL85033EVAL2Z

Manufacturer Part Number

ISL85033EVAL2Z

Description

EVAL BOARD2 FOR ISL85033

Manufacturer

Intersil

Datasheets

1.ISL85033IRTZ.pdf (25 pages)

2.ISL85033EVAL2Z.pdf (2 pages)

Specifications of ISL85033EVAL2Z

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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ISL85033EVAL2Z (Small Form) Wide VIN Dual

Standard Buck Regulator With 3A/3A Output

Current - Short Form

Description

The ISL85033EVAL2Z kit demonstrates performance of

the ISL85033 switching regulator IC. An input range of

4.5V to 28V and 3A output per channel (connect in

parallel to 6A) allows the ISL85033 to meet a wide

variety of POL requirements.

The ISL85033 is offered in a 4mmx4mm 28 Ld TQFN

package with 1mm maximum height. The complete

converter occupies 6.25cm

FIGURE 2. ISL85033EVAL2Z TOP LAYER COMPONENTS

November 29, 2010

AN1585.1

FIGURE 1. EFFICIENCY vs LOAD, T

100

0.0

1.8V

OUT

0.5

3.3V

300kHz

= 28V

OUT

1.0

OUTPUT LOAD (A)

500kHz

1.629’

OUT

1.5

area.

500kHz

OUT

2.0

1MHz

= +25°C,

12V

OUT

2.5

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

1MHz

3.0

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

Application Note 1585

Key Features

• Wide Input Voltage Range from 4.5V to 28V

• Adjustable Output Voltage with Continuous Output

• Current Mode Control

• Adjustable Switching Frequency from 300kHz to

• Independent Power-Good Detection

• Selectable In-Phase or Out-of-Phase PWMs Switching

• Independent, Sequential, Ratiometric or Absolute

• Internal 2ms Soft-start Time

• Overcurrent and Hiccup Mode Short Circuit

• Boot Undervoltage Detection

• Channels are Out-of-phase, Reducing Voltage Ripple

Quick Setup Guide

Frequency Control

ISL85033 has an FS pin that controls the frequency of

operation. Programmable frequency allows for

optimization between efficiency and external

component size. ISL85033EVAL2Z has the switching

frequency set to 500kHz (FS is tied to VCC).

SYNC Control

The ISL85033 has a SI pin for external synchronization.

Default board configuration has R8 = 0 to GND, which

defaults to the internally selected switching frequency.

Removing R8 allows the synchronization to be external

between 600kHz to 4MHz. Do not leave this pin floating.

Output Voltage Selection

ISL85033EVAL2Z board has V

to 3.3V. The output voltage programming resistor, R

respectively), will depend on the value chosen for the

feedback resistor, R

output voltage, V

respectively) is typically between 1k and 10k.

Please note that if V

frequency and compensation must be changed for

300kHz operation due to minimum on-time limitation.

Please refer to data sheet

1. Ensure correct board connection to the supply (“+”

2. Verify the output voltage is 5V for V

Current up to 3A per channel

2MHz

Operation

Tracking Between Outputs

Protection, Thermal Overload Protection, UVLO

and Component Size

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

to VIN1 and “-” to GND2) and loads prior to applying

power, then turn on the power supply.

for V

(

OUT1

OUT2.

OUT2

–

OUT

) R

•

, see Equation 1. The value for R

•

OUT

⁄

0.8

is less than 2.5V, switching

⁄

FN6676

respectively), and the desired

0.8

OUT1

for further information.

set to 5V and V

Author: Paul Orfanu

OUT1

and 3.3V

OUT2

(EQ. 1)

set

Related parts for ISL85033EVAL2Z

ISL85033EVAL2Z Summary of contents

Page 1

... Frequency Control ISL85033 has an FS pin that controls the frequency of operation. Programmable frequency allows for optimization between efficiency and external component size. ISL85033EVAL2Z has the switching frequency set to 500kHz (FS is tied to VCC). SYNC Control The ISL85033 has a SI pin for external synchronization. ...

Page 2

... R5 0 SS1 FIGURE 4. ISL85033EVAL2Z TOP LAYER ETCH 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 ...

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