an1679

Application Note 1679
Author: Silas Lin
ISL9111H30/33/50/ADJZEVAL1Z Evaluation Board
User Guide
Evaluation Board Features
TABLE 2. DESCRIPTION OF JUMPERS
• ISL9111H30/33/50/ADJZEVAL1Z is a low input voltage,
high efficiency boost regulator with fixed (3.0/3.3/5.0V) and
adjustable output voltage
• Input voltage rating from 0.8V to 5.0V
• 100mA output current at VIN = 0.9V and VOUT = 3.3V and
240mA at VIN = 1.8V and VOUT = 3.3V
• 1.2MHz switching frequency
• Connectors, test points and jumpers for easy evaluation
• Electronic load
• Multimeter to measure voltages and currents
• Oscilloscope
• Test Points, Connectors and Jumpers
TABLE 1. DESCRIPTION OF CONNECTOR
CONNECTOR
DESCRIPTION
J1
VIN (Input Supply)
J2
GND (System ground)
J3
Power supply for FAULT pin pull-up
J4
VOUT (Output Voltage)
J5
GND (System ground)
J6
Fault Output (Fixed output version).
JP1
Jumper to select EN input logic state. Set EN = VIN to
enable device, or set EN = GND to disable device.
JP3
Jumper to select LED indication for FAULT conditions.
Quick Setup Guide
2. Connect electronic load to J4.
• Jumper selectable for LED indication during FAULT
conditions
• Power supply capable of delivering up to 5.5V and 1A
DESCRIPTION
1. Connect power supply to J1, with voltage setting between
0.8V and 5.0V.
• Jumper selectable EN (enabled/disabled)
Required Equipment
JUMPER
3. Place scope probes on VOUT test point, and other test
points of interest.
4. Turn on the power supply.
5. Assert EN pin high to enable the device.
6. Monitor the output voltage start-up sequence on the scope.
The waveforms will look similar to Figure 1.
7. Turn on the electronic load.
8. Measure the output voltage with the voltmeter. The voltage
should regulate within data sheet spec limits (FN7602).
Typical Start-up Waveforms
VIN = 3.6V, VOUT = 5.0V, ILOAD = 200mA
FIGURE 1. ISL9111 START-UP WITH VIN = 3.6V AND VOUT = 5.0V
November 30, 2011
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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 Inc. 2011. 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.
Application Note 1679
Output Voltage Programming
(ADJ Version)
R 1⎞
⎛
V O = V FB • ⎜ 1 + -------⎟
R
⎝
2⎠
Output Voltage Setting Resistor Selection
The voltage divider resistors, R1 and R2, as shown in the
evaluation board schematic for the ADJ version, set the desired
output voltage values. The output voltage can be calculated using
Equation 1:
(EQ. 1)
where VFB is the internal feedback reference voltage (0.8V
typical). The current flowing through the divider resistors is
calculated as VO/(R1 + R2). Large resistance is recommended to
minimize the current into the divider; thus improving the total
efficiency of the converter.
Evaluation Board Schematics
FIGURE 2. ISL9111H3.0/3.3/5.0EVAL1Z EVALUATION BOARD SCHEMATIC
TABLE 3. ISL9111H3.0/3.3/5.0EVAL1Z EVALUATION BOARD BILL OF MATERIALS
ITEM#
QTY
DESIGNATORS
PART TYPE
FOOTPRINT
DESCRIPTION
VENDORS
1
1
U1
ISL9111 or
ISL9111A
SOT23-6L
Intersil ISL9111 Boost Regulator
INTERSIL
2
1
L1
4.7µH
0.126”x0.126”
CDRH2D18/HPNP-4R7NC
SUMIDA
3
2
C1, C2
4.7µF/6.3V/X5R
0603
GRM21BR71C475KA73L
MURATA
4
1
C3
Place Holder
0805
5
1
R1
OPEN
0402
Resistor, Generic
ANY
6
1
R2
OPEN
0402
Resistor, Generic
ANY
7
2
R3, R4
1kΩ
0603
Resistor, Generic
ANY
8
1
R5
0Ω
0603
Resistor, Generic
ANY
9
1
D1
LED
0805
LED, RED, SMD
ANY
10
6
J1, J2, J3, J4, J5, J6
POWER POST
Connectors
ANY
11
2
JP1, JP3
JUMPER
2
HDR-3
ANY
ANY
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Application Note 1679
Evaluation Board Schematics (continued)
FIGURE 3. ISL9111ADJEVAL1Z EVALUATION BOARD SCHEMATIC
TABLE 4. ISL9111HADJ-EVAL1Z EVALUATION BOARD BILL OF MATERIALS
ITEM#
QTY
DESIGNATORS
PART TYPE
FOOTPRINT
DESCRIPTION
VENDORS
1
1
U1
ISL9111 or ISL9111A
SOT23-6L
Intersil ISL9111 Boost Regulator
INTERSIL
2
1
L1
4.7µH
0.126”x0.126”
CDRH2D18/HPNP-4R7NC
SUMIDA
3
2
C1, C2
4.7µF/6.3V/X5R
0603
GRM21BR71C475KA73L
MURATA
4
1
C3
Place Holder
0805
5
1
R1
665k
0402
Resistor, Generic
ANY
6
1
R2
166k
0402
Resistor, Generic
ANY
7
2
R3, R4
1kΩ
0603
Resistor, Generic
ANY
8
1
R5
0Ω
0603
Resistor, Generic
ANY
9
1
D1
LED
0805
LED, RED, SMD
ANY
10
6
J1, J2, J3, J4, J5, J6
POWER POST
Connectors
ANY
11
2
JP1, JP3
JUMPER
3
HDR-3
ANY
ANY
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Application Note 1679
Evaluation Board Layout
FIGURE 4. ISL9111 EVALUATION BOARD SILKSCREEN TOP
FIGURE 5. ISL9111 EVALUATION BOARD TOP COPPER
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Application Note 1679
Evaluation Board Layout (Continued)
FIGURE 6. ISL9111 EVALUATION BOARD BOTTOM COPPER
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 Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
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