Intersil ISL9120IIx-EVZ User Manual

User Guide 023

FIGURE 1. ISL9120IIA-EVZ BLOCK DIAGRAM

VOUT

VOUT

FB

VIN

VIN

BYP

ISL9120IIAZ

SGND

PGND

LX1

LX2

EN

GND

GND

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 (V

= 2.5V, V

IN

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

OUT

= 3.3V)

Key Features

•Small, compact design

• 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

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1

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 trademark owned by Intersil Corporation or one of its subsidiaries.

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

| Copyright Intersil Americas LLC 2015. All Rights Reserved

User Guide 023

EN (2V/DIV)

V

OUT

(1V/DIV)

IL (500mA/DIV)

400µs/DIV

400µs/DIV

EN (2V/DIV)

V

OUT

(1V/DIV)

IL (500mA/DIV)

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 Tab l e 2 on

page 4. The bill of materials for the ISL9120IIN-EVZ are shown in
Table 3 on pa ge 5 .

Operating Range

The VIN range of the boards is 1.8V to 5.5V. The V
ISL9120IIA-EVZ is 2V to 5V. The I

range of the boards is 0 to 1A.

OUT

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

range for the

OUT

TABLE 1. OUTPUT VOLTAGE PROGRAMMING For ISL9120IIA-EVZ

DESIRED OUTPUT VOLTAGE

(V)

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

RESISTOR VALUE

R

2

(k)

Quick Start Guide

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

3.3V. Should other output voltages are desired, resistor R2 can
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
the expected waveforms are shown in Figures 2

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 V
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.

. During the power-on process,

and 3.

test point and other test

OUT

FIGURE 2.

FIGURE 3.

SOFT-START (V

SOFT-START (V

= 3V, V

IN

= 4V, V

IN

= 3.3V, NO LOAD)

OUT

= 3.3V, NO LOAD)

OUT

Recommended PCB Layout

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2

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.

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FIGURE 4. ISL9120IIA-EVZ EVALUATION BOARD

FIGURE 5. ISL9120IIA-EVZ EVALUATION BOARD SCHEMATIC

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User Guide 023

TABLE 2. ISL9120IIA-EVZ EVALUATION BOARD BILL OF MATERIALS

ITEM# QTY

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

2 1 L1 1µH 0806 Power Inductor Toko DFE201610R

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,

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

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

REFERENCE

DESIGNATOR PART TYPE FOOTPRINT DESCRIPTION MANUFACTURER

with Adjustable Output Voltage

series, 2.7A (typ), 80mΩ (typ)

Generic

Generic

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

MANUFACTURING

INTERSIL

TOKO

ANY

ANY

MILL MAX

CORP.

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FIGURE 6. ISL9120IIN-EVZ EVALUATION BOARD

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User Guide 023

FB

VIN

PGND

EN

BYP

EN

VIN

BYP

VIN

VOUT

PGND

LX2

LX1

TP1
LX1

J3

EN

1
2
3

L1
1uH

J4

BYP

1
2
3

C1
150uF

J2

VOUT

1
2
3
4
5
6

R4

1M

TP4
GND

R3

1M

R2
DNP

R1
0

TP3
VOUT

C3
47uF

C2
10uF

U1

ISL9120_EVZ

LX1

A1

LX2

C1

VOUT

C2

FB

C3

VIN

A2

EN

B2

BYP

A3

SGNDB3PGND

B1

TP2
LX2

C4
DNP

J1

VIN

1
2
3
4
5
6

ISL9120IIN-EVZ Evaluation Board Schematic

FIGURE 7. ISL9120IIN-EVZ EVALUATION BOARD SCHEMATIC

TABLE 3. ISL9120IIN-EVZ EVALUATION BOARD BILL OF MATERIALS

REFERENCE

ITEM# QTY

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

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 0Ω 0402 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,

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

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

5

Submit Document Feedback

series, 2.7A (typ), 80mΩ (typ)

TOKO

ANY

Generic

ANY

Generic

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

MILL MAX

MANUFACTURING

CORP.

May 28, 2015

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PCB Layout

User Guide 023

FIGURE 8. TOP LAYER

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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FIGURE 9. BOTTOM LAYER

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