USER’S MANUAL
ISL9120IRx-EVZ
UG042
Rev 0.00
July 17, 2015
Evaluation Board
Description
Key Features
The ISL9120IR 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 ISL9120IRx-EVZ platforms allow quick
evaluation of the high performance features of the ISL9120IR
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
• ISL9120IR Datasheet
Specifications
Ordering Information
The boards are designed to operate under the following
conditions:
PART NUMBER
• Input voltage range of 1.8V to 5.5V
• Resistor programmable output voltage on the ISL9120IRA-EVZ
• Fixed 3.3V output voltage on the ISL9120IRN-EVZ
DESCRIPTION
ISL9120IRN-EVZ
Evaluation board for ISL9120IRNZ, fixed 3.3V
output
ISL9120IRA-EVZ
Evaluation board for ISL9120IRAZ, adjustable
output
• Up to 800mA output current (VIN = 2.5V, VOUT = 3.3V)
• Operating temperature range: -40°C to +85°C
ISL9120IRAZ
VIN
VIN
LX1
GND
LX2
VOUT
VOUT
BYP
FB
GND
PGND
SGND
EN
FIGURE 1. ISL9120IRA-EVZ BLOCK DIAGRAM
UG042 Rev 0.00
July 17, 2015
Page 1 of 7
ISL9120IRx-EVZ
Functional Description
The ISL9120IRx-EVZ evaluation boards provide simple platforms
to demonstrate the features of the ISL9120IR buck-boost
regulator. The ISL9120IRN-EVZ is for the fixed 3.3V output IC
ISL9120IRNZ. The ISL9120IRA-EVZ is for the adjustable output
IC ISL9120IRAZ. The evaluation boards have been functionally
optimized for best performance of the ISL9120IR IC series. The
input power and load connections are provided through multipin
connectors for high current operations.
The ISL9120IRA-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 ISL9120IRN-EVZ is shown in Figure 7, on
page 5. The PCB layout images for all layers are shown in
Figures 8 and 9 on page 6. The bill of materials for the
ISL9120IRA-EVZ is shown in Table 2 on page 4. The bill of
materials for the ISL9120IRN-EVZ is shown in Table 3 on page 5.
TABLE 1. OUTPUT VOLTAGE PROGRAMMING FOR ISL9120IRA-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
ISL9120IRA-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 ISL9120IRA-EVZ board, the default output voltage is set
at 3.3V. Should other output voltages be desired, resistor R2 can
be changed to set 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 a 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
ISL9120IR. 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.
UG042 Rev 0.00
July 17, 2015
Page 2 of 7
ISL9120IRx-EVZ
FIGURE 4. ISL9120IRA-EVZ EVALUATION BOARD
TP2
LX1
TP3
LX2
TP7
5
4
3
2
L1
LX1
LX2
1uH
1
1
2
3
4
5
6
5
VIN
C1
150uF
VIN
12
TP4
VOUT
LX2
1
LX2
J1
LX1
LX1
3
ISL9120IRA
TP1
VIN
4
U1
J2
VOUT
11
VOUT
C2
10uF
R1
187K
6
GND
VIN
FB
10
C4
22pF
FB
CON6
J4
1
2
3
1
2
3
VIN
EN
R3
CON3
1M
CON6
BYP
13
TP5
GND
VIN
BYP
8
2
J3
7
C3
47uF
1
2
3
4
5
6
EPAD
BYP
SGND
EN
PGND
9
C5
DNP
GND
R2
60.4K
EN
VOUT
TP6
GND
R4
1M
CON3
FIGURE 5. ISL9120IRA-EVZ EVALUATION BOARD SCHEMATIC
UG042 Rev 0.00
July 17, 2015
Page 3 of 7
ISL9120IRx-EVZ
TABLE 2. ISL9120IRA-EVZ EVALUATION BOARD BILL OF MATERIALS
ITEM#
QTY
REFERENCE
DESIGNATOR
PART TYPE
FOOTPRINT
1
1
U1
ISL9120IRAZ
L12.3x3A; TQFN
2
1
L1
1µH
0806
Power Inductor Toko DFE201610R
series, 2.7A (typical), 80mΩ (typical)
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
187kΩ1%
0402
Resistor, Generic
ANY
8
1
R2
60.4kΩ1%
0402
Resistor, Generic
ANY
9
2
R3, R4
1MΩ5%
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
6
TP1, TP2, TP3, TP4,
TP5, TP6
Terminal Pin
0.052" hole
Test Point, Terminal Pin Turret 0.082"
[2110-2-00-80-00-00-07-0]
MILL MAX
MANUFACTURING
CORP.
13
1
TP7
Scope Probe Holder
Scope Probe Holder
DESCRIPTION
Intersil ISL9120IR buck-boost
regulator with adjustable output
voltage
Test Point, Scope Probe Holder
131-5031-00
MANUFACTURER
INTERSIL
TEKTRONIX
FIGURE 6. ISL9120IRN-EVZ EVALUATION BOARD
UG042 Rev 0.00
July 17, 2015
Page 4 of 7
ISL9120IRx-EVZ
ISL9120IRN-EVZ Evaluation Board Schematic
TP2
LX1
TP3
LX2
TP7
5
4
3
2
L1
LX1
LX2
1uH
U1
1
5
VIN
C1
150uF
12
1
LX2
VIN
TP4
VOUT
LX2-
LX1-
3
LX1
J1
1
2
3
4
5
6
4
ISL9120IRN
TP1
VIN
J2
VOUT
11
VOUT
C2
10uF
R1
0
6
GND
VIN-
FB
10
C4
DNP
C5
DNP
C3
47uF
FB
GND
R2
DNP
CON6
J4
1
2
3
1
2
3
VIN
EN R3
1M
CON3
TP5
GND
VIN
BYP
CON6
BYP
13
2
J3
7
1
2
3
4
5
6
EPAD
BYP
SGND
EN
8
9
PGND
EN
VOUT
TP6
GND
R4
1M
CON3
FIGURE 7. ISL9120IRN-EVZ EVALUATION BOARD SCHEMATIC
TABLE 3. ISL9120IRN-EVZ EVALUATION BOARD BILL OF MATERIALS
ITEM#
QTY
REFERENCE
DESIGNATOR
PART TYPE
FOOTPRINT
1
1
U1
ISL9120IRNZ
L12.3x3A; TQFN
2
1
L1
1µH
0806
Power Inductor Toko DFE201610R
series, 2.7A (typical), 80mΩ (typical)
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
1MΩ5%
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
6
TP1, TP2, TP3, TP4,
TP5, TP6
Terminal Pin
0.052" hole
Test Point, Terminal Pin Turret 0.082"
[2110-2-00-80-00-00-07-0]
MILL MAX
MANUFACTURING
CORP.
13
1
TP7
Scope Probe
Holder
Scope Probe Holder
UG042 Rev 0.00
July 17, 2015
DESCRIPTION
Intersil ISL9120IR Buck-boost
Regulator
MANUFACTURER
INTERSIL
ANY
Resistor, Generic
ANY
ANY
Test Point, Scope Probe Holder
131-5031-00
TEKTRONIX
Page 5 of 7
ISL9120IRx-EVZ
PCB Layout
FIGURE 8. TOP LAYER
FIGURE 9. BOTTOM LAYER
UG042 Rev 0.00
July 17, 2015
Page 6 of 7
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