ISL9120IIx-EVZ User Guide
User Guide 023
ISL9120IIx-EVZ Evaluation Board User Guide
Description
Key Features
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.
• 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
Specifications
Ordering Information
The boards are designed to operate under the following
conditions:
PART NUMBER
• 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
DESCRIPTION
ISL9120IIN-EVZ
Evaluation Board for ISL9120IINZ, fixed 3.3V
output
ISL9120IIA-EVZ
Evaluation Board for ISL9120IIAZ, adjustable
output
• Up to 800mA output current (VIN = 2.5V, VOUT = 3.3V)
• Operating temperature range: -40°C to +85°C
ISL9120IIAZ
VIN
VIN
LX1
GND
LX2
VOUT
VOUT
BYP
FB
GND
PGND
SGND
EN
FIGURE 1. ISL9120IIA-EVZ BLOCK DIAGRAM
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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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.
User Guide 023
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.
TABLE 1. OUTPUT VOLTAGE PROGRAMMING For ISL9120IIA-EVZ
DESIRED OUTPUT VOLTAGE
(V)
R2 RESISTOR 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
EN (2V/DIV)
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.
VOUT (1V/DIV)
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. During the power-on process,
the expected waveforms are shown in Figures 2 and 3.
Quick Setup Guide
IL (500mA/DIV)
400µs/DIV
FIGURE 2. SOFT-START (VIN = 3V, VOUT = 3.3V, NO LOAD)
EN (2V/DIV)
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.
VOUT (1V/DIV)
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.
IL (500mA/DIV)
400µs/DIV
FIGURE 3. SOFT-START (VIN = 4V, VOUT = 3.3V, NO LOAD)
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.
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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
7
1
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
J1
U1
1
2
3
4
5
6
A2
VIN
C1
150uF
TP1
LX1
ISL9120_EVZ
VIN
LX1
A1
C2
10uF
LX1
TP2
LX2
L1
1uH
TP3
VOUT
PGND
LX2
VIN
BYP
A3
EN
VOUT
FB
J2
VOUT
R1
0
C3
C4
DNP
C3
47uF
FB
PGND
1
2
3
4
5
6
VOUT
R2
DNP
B1
B3
EN
LX2
C2
BYP
PGND
B2
SGND
EN
C1
TP4
GND
BYP
1
2
3
VIN
EN
R3
1
2
3
1M
J3
VIN
BYP
R4
1M
J4
FIGURE 7. ISL9120IIN-EVZ EVALUATION BOARD SCHEMATIC
TABLE 3. ISL9120IIN-EVZ EVALUATION BOARD BILL OF MATERIALS
ITEM#
QTY
REFERENCE
DESIGNATOR
PART TYPE
FOOTPRINT
1
1
U1
ISL9120IINZ,
W3x3.9E; WLCSP
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
7
1
R1
0Ω
0402
8
1
R2
DNP
0402
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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DESCRIPTION
Intersil ISL9120 Buck-Boost Regulator
MANUFACTURER
INTERSIL
ANY
Resistor, Generic
ANY
ANY
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PCB Layout
FIGURE 8. TOP LAYER
FIGURE 9. BOTTOM 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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