Intersil ISL8011EVAL1Z Manuale utente

User Guide 009

ISL8011xEVAL1Z Evaluation Board User Guide

Description

The ISL8011xEVAL1Z provides a simple platform to evaluate

performance of the ISL8011x family of split supply LDOs.

Jumpers are provided to easily set popular output voltages.

The ISL80111, ISL80112 and ISL80113 are single-output

LDOs specified for 1A, 2A, 3A of output current and are

optimized for less than 2.5V and less output voltage

conversions. The ISL8011x supports VIN voltages down to 1V,

provided a standard legacy 2.9V or 5.5V is applied on the

VBIAS pin. The output voltage is adjustable from 0.8V to 3.3V.

Specifications

This board has been configured and optimized for the following

operating conditions:

•V

IN range of 1V to 3.6V

•V

OUT adjustable from 0.8V to 3.3V

• Convenient power connection

• Popular output voltages can easily set by jumpers

Key Features

• Ultra low dropout: 75mV at 3A, (typ)

• Excellent VIN PSRR: 70dB at 1kHz (typ)

• ±1.6% guaranteed VOUT accuracy for -40ºC < TJ< +125ºC

• Very fast load transient response

References

ISL80111, ISL80112, ISL80113 Datasheet

Ordering Information

PART NUMBER DESCRIPTION

ISL80111EVAL1Z 1A, Split Supply LDO Evaluation Board

ISL80112EVAL1Z 2A, Split Supply LDO Evaluation Board

ISL80113EVAL1Z 3A, Split Supply LDO Evaluation Board

FIGURE 1. ISL80111EVAL1Z TOP SIDE FIGURE 2. ISL80111EVAL1Z BOTTOM SIDE

October 30, 2014

UG009.0

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

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

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

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What’s Inside

The evaluation kit contains the following:

• The ISL80113EVAL1Z with the appropriate parts installed

•ISL80111, ISL80112, ISL80113 Datasheet

Test Steps

1. Select the desired output voltage by shorting one of the

jumpers from JP2 through JP5.

2. Connect both the BIAS and VIN supplies and the load. Enable

the IC using jumper JP6 (bottom position) or via a signal on

the center post, observe the output.

3. The shipped configuration is enabled and VOUT = 3.3V.

4. Scope shots taken from ISL8011xEVAL1Z boards.

Functional Description

The ISL8011xEVAL1Z provides a simple platform to evaluate

performance of the ISL8011x family of split supply LDOs.

Jumpers are provided to easily set popular output voltages.

The ISL80111, ISL80112 and ISL80113 are single-output LDOs

specified for 1A, 2A, 3A of output current and are optimized for

less than 2.5V and less output voltage conversions. The

ISL8011X supports VIN voltages down to 1V, provided a standard

legacy 2.9V or 5.5V is applied on the VBIAS pin. The output

voltage is adjustable from 0.8V to 3.3V.

An enable input, having a threshold <1V, allows the part to be

placed into a low quiescent current shutdown mode. A submicron

CMOS process is utilized for this product family to deliver

best-in-class analog performance and overall value for

applications in need of input voltage conversions to typically

below 2.5V. It also has the superior load transient regulation

unique to a NMOS power stage.

These LDOs consume significantly lower quiescent current as a

function of load compared to bipolar LDOs. This lower

consumption translates into higher efficiency and the ability to

consider packages with smaller footprints. The quiescent current

has been modestly compromised in design to enable leading

class fast load transient response and load regulation.

PCB Layout Guidelines

The following is an example of how to use vias to remove heat

from the IC.

Filling the thermal pad area with vias is recommended. A typical

via array is to fill the thermal pad footprint with vias spaced such

that they are center on center 3x the radius apart from each

other. Keep the vias small but not so small that their inside

diameter prevents solder from wicking through the holes during

reflow.

Connect all vias to the round plane. For efficient heat transfer, it

is important that the vias have low thermal resistance. Do not

use “thermal relief” patterns to connect the vias. It is important

to have a complete connection of the plated through-hole to each

plane.

FIGURE 3. PCB VIA PATTERN

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Schematic

EVALUATION BOARD FOR:

GND

ISL80113

GND

ISL80111

ISL80112

1.0V

1.5V

1.8V

2.5V

3.3V

ISL80114

VADJ

VBIAS

VINVOUT

10UF

JP2

JP6

TP3

TP7

5.62K

TP2

TP6

JP5

TP1

TP5

100K

TP4

2.61K

1UF

10UF

JP3

4.02K

VOUT

VIN

GND

ADJ

VBIAS

ISL80113IRAJZ

5 6

JP1

JP4

2.05K

Bill of Materials

REFERENCE

DESIGNATOR VALUE DESCRIPTION MANUFACTURER

PART

NUMBER

U1 ISL80111, ISL80112 or ISL80113 as noted on

the evaluation board

Intersil ISL80111IRAJZ,

ISL80112IRAJZ,

ISL80113IRAJZ

C1, C3 10µF CAP, SMD, 0805, 50V, 10% Generic

C2 1µF CAP, SMD, 0603 Generic

R1 1kΩRES, SMD, 0603, 1% Generic

R2 2.05kΩRES, SMD, 0603, 1% Generic

R3 2.61kΩRES, SMD, 0603, 1% Generic

R4 4.02kΩRES, SMD, 0603, 1% Generic

R5 5.62kΩRES, SMD, 0603, 1% Generic

R6 1kΩRES, SMD, 0603, 1% Generic

R7 100kΩRES, SMD, 0603, 1% Generic

JP1, JP2, JP3,

JP4, JP5, JP6

Jumper Generic

TP1, TP2, TP3

TP4, TP5, TP6

Terminal Connector Generic

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Board Layout

FIGURE 4. SILKSCREEN TOP FIGURE 5. TOP LAYER COMPONENT SIDE

FIGURE 6. BOTTOM LAYER SOLDER SIDE FIGURE 7. SILKSCREEN BOTTOM

User Guide 009

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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Typical Performance Curves

FIGURE 8. DROPOUT vs VBIAS FIGURE 9. VIN PSRR vs LOAD CURRENT

FIGURE 10. VVIN PSRR vs LOAD CURRENT FIGURE 11. 1A LOAD TRANSIENT RESPONSE

FIGURE 12. 2A LOAD TRANSIENT RESPONSE FIGURE 13. 3A LOAD TRANSIENT RESPONSE

100

-40 25 125

TEMPERATURE (°C)

3A VBIAS = 3.3V

3A VBIAS = 5V

2A VBIAS = 5V

1A VBIAS = 3.3V

1A VBIAS = 5V

VIN DROPOUT VOLTAGE (mV)

2A VBIAS = 3.3V

100

100 1k 10k 100k 1M

PSRR (dB)

FREQUENCY (Hz)

IOUT = 2A

IOUT = 3A

IOUT = 0A

IOUT = 1A

BIAS = 5V

VOUT = 2.5V

VIN = 3.3V

COUT = 10µF

100

100 1k 10k 100k 1M

PSRR (dB)

FREQUENCY (Hz)

IOUT = 0A

IOUT = 2A

BIAS = 3.3V

VOUT = 1.0V

VIN = 1.5V

COUT = 10µF

IOUT = 3A

IOUT = 1A

VOUT (20mV/DIV)

IOUT = 1.1A

IOUT = 0.1A

TIME (20µs/DIV)

VOUT (20mV/DIV)

IOUT = 2.1A

IOUT = 0.1A

TIME (20µs/DIV)

VOUT (50mV/DIV)

IOUT = 3.1A

IOUT = 0.1A

TIME (20µs/DIV)

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