Intersil ISL9120IIx-EVZ Manual de usuario

User Guide 023

ISL9120IIx-EVZ Evaluation Board User Guide

Description

The ISL9120 is a highly integrated buck-boost switching

regulator for systems using new battery chemistries. It uses

Intersil’s proprietary buck-boost algorithm to maintain voltage

regulation, while providing excellent efficiency and very low

output voltage ripple when the input voltage is close to the

output voltage. The ISL9120IIx-EVZ platforms allow quick

evaluation of the high performance features of the ISL9120

buck-boost regulator series.

Specifications

The boards are designed to operate under the following

conditions:

• Input voltage rating from 1.8V to 5.5V

• Resistor programmable output voltage on the ISL9120IIA-EVZ

• Fixed 3.3V output voltage on the ISL9120IIN-EVZ

• Up to 800mA output current (VIN = 2.5V, VOUT = 3.3V)

• Operating temperature range: -40°C to +85°C

Key Features

•Small,compactdesign

• Jumper selectable EN (enabled/disabled)

• Jumper selectable BYP (buck-boost/forced bypass)

• Connectors, test points and jumpers for easy probing

References

•ISL9120 Datasheet

Ordering Information

PART NUMBER DESCRIPTION

ISL9120IIN-EVZ Evaluation Board for ISL9120IINZ, fixed 3.3V

output

ISL9120IIA-EVZ Evaluation Board for ISL9120IIAZ, adjustable

output

FIGURE 1. ISL9120IIA-EVZ BLOCK DIAGRAM

VOUT

VIN

BYP

ISL9120IIAZ

SGND

PGND

LX1

LX2

GND

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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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Functional Description

The ISL9120IIx-EVZ evaluation boards provide simple platforms

to demonstrate the feature of the ISL9120 buck-boost regulator.

The ISL9120IIN-EVZ is for the fixed 3.3V output IC ISL9120IINZ.

The ISL9120IIA-EVZ is for the adjustable output IC ISL9120IIAZ.

The evaluation boards have been functionally optimized for best

performance of the ISL9120 IC series. The input power and load

connections are provided through multipin connectors for high

current operations.

The ISL9120IIA-EVZ evaluation board schematic is shown in

Figure 5, on page 3. The board’s enable function is controlled by

the on-board jumper header J3. Similarly, the forced bypass

function is controlled by the on-board jumper header J4. The

schematic for the ISL9120IIN-EVZ is shown in Figure 7. The PCB

layout images for all layers are shown in Figures 8 and 9. The bill

of materials for the ISL9120IIA-EVZ are shown in Table 2 on

page 4. The bill of materials for the ISL9120IIN-EVZ are shown in

Table 3 on page 5.

Operating Range

The VIN range of the boards is 1.8V to 5.5V. The VOUT range for the

ISL9120IIA-EVZ is 2V to 5V. The IOUT range of the boards is 0 to 1A.

The operating ambient temperature range is -40°C to +85°C.

Quick Start Guide

For the ISL9120IIA-EVZ board, the default output voltage is set at

3.3V. Should other output voltages are desired, resistor R2can

be changed to set to a desired voltage as shown in Table 1 (use a

resistor with 1% accuracy).

Refer to the following Quick Setup Guide to configure and power

up the board for proper operation. During the power-on process,

the expected waveforms are shown in Figures 2 and 3.

Quick Setup Guide

1. Install jumper on J3, shorting EN to VIN.

2. Install jumper on J4, shorting BYP to GND.

3. Connect power supply to J1, with voltage setting between

1.8V and 5.5V.

4. Connect electronic load to J2.

5. Place scope probes on the VOUT test point and other test

points of interest.

6. Turn on the power supply.

7. Monitor the output voltage start-up sequence on the scope. The

waveforms will look similar to that shown in Figures 2 and 3.

8. Turn on the electronic load.

9. Measure the output voltage with the voltmeter. The voltage

should regulate within datasheet spec limits.

Recommended PCB Layout

Correct PCB layout is critical for proper operation of the ISL9120.

The input and output capacitors should be positioned as closely

to the IC as possible. The ground connections of the input and

output capacitors should be kept as short as possible and should

be on the component layer to avoid problems that are caused by

high switching currents flowing through PCB vias.

TABLE 1. OUTPUT VOLTAGE PROGRAMMING For ISL9120IIA-EVZ

DESIRED OUTPUT VOLTAGE

(V)

R2RESISTOR VALUE

(k)

2.0 124

2.5 88.7

3.0 68.1

3.3 60.4

3.4 57.6

4.0 46.4

4.5 40.2

5.0 35.7

FIGURE 2. SOFT-START (VIN = 3V, VOUT = 3.3V, NO LOAD)

FIGURE 3. SOFT-START (VIN = 4V, VOUT = 3.3V, NO LOAD)

EN (2V/DIV)

VOUT (1V/DIV)

IL (500mA/DIV)

400µs/DIV

EN (2V/DIV)

VOUT (1V/DIV)

IL (500mA/DIV)

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FIGURE 4. ISL9120IIA-EVZ EVALUATION BOARD

FIGURE 5. ISL9120IIA-EVZ EVALUATION BOARD SCHEMATIC

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TABLE 2. ISL9120IIA-EVZ EVALUATION BOARD BILL OF MATERIALS

ITEM# QTY

REFERENCE

DESIGNATOR PART TYPE FOOTPRINT DESCRIPTION MANUFACTURER

1 1 U1 ISL9120IIAZ W3x3.9E; WLCSP Intersil ISL9120 Buck-boost Regulator

with Adjustable Output Voltage

INTERSIL

2 1 L1 1µH 0806 Power Inductor Toko DFE201610R

series, 2.7A (typ), 80mΩ(typ)

TOKO

3 1 C1 150µF 1210 Capacitor, Tantalum ANY

4 1 C2 10µF/16V/X5R 0603 Capacitor, Generic ANY

5 1 C3 47µF/6.3V/X5R 0603 Capacitor, Generic ANY

6 1 C4 22pF 0402 Capacitor, Generic ANY

71 R1 187kΩ1% 0402 Resistor, Generic ANY

8 1 R2 60.4kΩ1% 0402 Resistor, Generic ANY

9 2 R3, R4 1MΩ5% 0603 Resistor, Generic ANY

10 2 J1, J2 HDR-6 HDR-6 Vert. Pin Header, 6-Pin, 0.1” Spacing,

Generic

ANY

11 2 J3, J4 HDR-3 HDR-3 Vert. Pin Header, 3-Pin, 0.1” Spacing,

Generic

ANY

12 4 TP1, TP2, TP3, TP4 Terminal Pin 0.052" hole Test Point, Terminal Pin Turret 0.082"

[2110-2-00-80-00-00-07-0]

MILL MAX

MANUFACTURING

CORP.

FIGURE 6. ISL9120IIN-EVZ EVALUATION BOARD

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ISL9120IIN-EVZ Evaluation Board Schematic

FIGURE 7. ISL9120IIN-EVZ EVALUATION BOARD SCHEMATIC

VIN

PGND

BYP

VIN

BYP

VIN

VOUT

PGND

LX2

LX1

TP1

LX1

1uH

BYP

150uF

VOUT

TP4

GND

DNP

TP3

VOUT

47uF

10uF

U1 ISL9120_EVZ

LX1 A1

LX2 C1

VOUT C2

FB C3

VIN

BYP

SGND

PGND

TP2

LX2

DNP

VIN

TABLE 3. ISL9120IIN-EVZ EVALUATION BOARD BILL OF MATERIALS

ITEM# QTY

REFERENCE

DESIGNATOR PART TYPE FOOTPRINT DESCRIPTION MANUFACTURER

1 1 U1 ISL9120IINZ, W3x3.9E; WLCSP Intersil ISL9120 Buck-Boost Regulator INTERSIL

2 1 L1 1µH 0806 Power Inductor Toko DFE201610R

series, 2.7A (typ), 80mΩ(typ)

TOKO

3 1 C1 150µF 1210 Capacitor, Tantalum ANY

4 1 C2 10µF/16V/X5R 0603 Capacitor, Generic ANY

5 1 C3 47µF/6.3.V/X5R 0603 Capacitor, Generic ANY

6 1 C4 DNP 0402 ANY

71 R1 0Ω0402 Resistor, Generic ANY

8 1 R2 DNP 0402 ANY

9 2 R3, R4 1MΩ5% 0603 Resistor, Generic ANY

10 2 J1, J2 HDR-6 HDR-6 Vert. Pin Header, 6-Pin, 0.1” Spacing,

Generic

ANY

11 2 J3, J4 HDR-3 HDR-3 Vert. Pin Header, 3-Pin, 0.1” Spacing,

Generic

ANY

12 4 TP1, TP2, TP3, TP4 Terminal Pin 0.052" hole Test Point, Terminal Pin Turret 0.082"

[2110-2-00-80-00-00-07-0]

MILL MAX

MANUFACTURING

CORP.

User Guide 023

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 document is current before proceeding.

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

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PCB Layout

FIGURE 8. TOP LAYER

FIGURE 9. BOTTOM LAYER

Tabla de contenidos

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