Description
The ISL9107EVAL1Z and ISL9108EVAL1Z provide the
complete evaluation kit for the ISL9107 and ISL9108, which
are1.6MHz switching frequency, low quiescent current, high
efficiency integrated step-down regulators. They are capable of
delivering up to 1.5A output current with an output voltage
range from 0.8V to ~V
voltage divider resistors of R
output voltage is set to be 1.6V on the evaluation board. In
addition to ISL9108, ISL9107 offers a typical 215ms
Power-Good (PG) timer when powered up. This timer output
can be reset by RSI.
The complete ISL9107, ISL9108 regulator is located at the
center of the board. On the left side of the board are the
connectors for the input power source (V
output connectors are located on the right side (V
The other two test points are for the PG and RSI signals
respectively (for ISL9107 only), as labelled on the board. The
RSI input needs either be driven to a low or a high logic input
(Please refer to the ISL9107, ISL9108 datasheet, FN6612, for
more details regarding the RSI function). On the board, the
open-drain PG signal is pulled up to the V
resistor (R
the IC. Jumper JP2 is the mode selection input. Do not leave
the EN and the MODE signal floating. The evaluation board
also offers one oscilloscope probe tip connector connected to
SW pin to minimize the switching noise during the evaluation.
The evaluation board schematic, layout and bill-of-materials
(BOM) can be found at the end of this application note.
Ordering Information
• ISL9107EVAL1Z - Evaluation Board for ISL9107
• ISL9108EVAL1Z - Evaluation Board for ISL9108
Features
• A Complete Evaluation Platform for ISL9107and ISL9108
• Convenient Jumpers for Enable/Disable, Operation Mode
• Integrated Synchronous Buck Regulator with High
• 2.7V to 5.5V Supply Voltage
• 1.5A Output Current
• 17µA Quiescent Current in Skip (Low I
Selection
Efficiency
1
). Jumper JP1 allows the user to enable or disable
IN
. The output voltage is set by two
2
®
and R
1
3
on the board. The default
Application Note
IN
IN
Q
and GND). The
through a 100kΩ
) Mode
ISL9107EVAL1Z, ISL9108EVAL1Z Evaluation
O
and GND).
1-888-INTERSIL or 1-888-468-3774
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Specifications
Table 1 below shows the recommended operating conditions
for using ISL9107EVAL1Z, ISL9108EVAL1Z.
NOTE: The output voltage can be set to other values by changing
the R
ISL9108 datasheet for some recommended R
different output voltages.
Recommended Equipment
The following instruments are recommended for testing:
• DC Power Supply, 5V/3A
• Electronic loads capable of sinking current up to 4A
• Multimeters
• Function generator
• Oscilloscope
Evaluation Board Setup
The following are recommended steps for setting up the
ISL9107EVAL1Z and ISL9108EVAL1Z evaluation boards:
Input Voltage
Output Voltage (Note)
Maximum Output Current
1. Connect Jumper JP1 at the position of “Enable” to enable
2. Connect Jumper JP2 either at the position of “SKIP” or
3. For ISL9107EVAL1Z, connect the RSI input to either
4. Connect DC power supply between VIN and GND
5. Connect the output to a load (resistor or electronic load).
6. Turn on the input power supply and start the evaluation.
the device. Connect JP1 at the position of “Disable“ to
disable the device.
“PWM”. With JP2 connected at the position of “SKIP”, the
device enters skip mode under light load condition; with
JP2 connected at the position of “PWM”, the device
always operates under PWM mode regardless of the load
condition.
ground or V
datasheet, FN6612, for more details regarding the
function of RSI.
connectors on board. Make sure the power supply has
enough supply current capability. The absolute maximum
rating for V
maximum input voltage applied on V
TABLE 1. RECOMMENDED OPERATING CONDITIONS
2,
R
PARAMETER
3
All other trademarks mentioned are the property of their respective owners.
Board Application Manual
July 29, 2008
values, V
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
IN
IN
pin is 6.5V and the recommended
. Please refer to the ISL9107, ISL9108
OUT
Copyright Intersil Americas Inc. 2008. All Rights Reserved
= 0.8V*(1+R
MIN
2.7
1.5
-
2
/R
3
). Refer to ISL9107,
TYP
1.6
-
-
2
IN
, R
is up to 5.5V.
3
and C
MAX
AN1399.0
5.5
-
-
3
values for
UNIT
V
V
A