Intersil ISL9120IIx-EVZ User manual

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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
VOUT
FB
VIN
VIN
BYP
ISL9120IIAZ
SGND
PGND
LX1
LX2
EN
GND
GND
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas LLC 2015. All Rights Reserved
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
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
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
SGND
B3
PGND
B1
TP2
LX2
C4
DNP
J1
VIN
1
2
3
4
5
6
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.

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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