an1473

ISL97656IRTZEVALZ Evaluation Board
Application Manual
®
Application Note
Description
May 10, 2010
AN1473.1
Quick Setup Guide
The ISL97656IRTZEVALZ is an evaluation kit for evaluating
the ISL97656, a step-up voltage regulator that operates with
high frequency and high efficiency. This evaluation kit is
designed to deliver up to 2A output current for portable
equipment and TFT-LCD display.
The ISL97656IRTZEVALZ evaluation kit provides a dip
switch that allows users to select either 620kHz or 1.2MHz
frequency.
1. Connect power supply between headers of VIN and
VIN_GND. The positive output of the power supply should
be connected to VIN header. Set power supply voltage
between 2.3V and 5V, and current limit at 4A.
2. Connect E-load between headers of VOUT and
OUT_GND. The positive input of the E-load should be
connected to VOUT header. Set E-load current. The load
current should not exceed the maximum output current in
Table 1.
3. Close pins 1 and 4 of S1 to tie FREQ pin to VIN to set
1.25MHz switching frequency. Open pins 1 and 4 to pull
FREQ to ground with R4 to set 620kHz.
Key Features
• A Complete Evaluation Platform for the ISL97656
Evaluation
4. Close pins 2 and 3 of S1 to tie EN pin to VIN to enable the
part. Open pins 2 and 3 to pull EN to ground with R3 to
disable the part.
• Input Voltage: 2.3V to 5.5V
• Proven Evaluation Board Layout
5. Make sure all the connections on the evaluation board
are correct, then turn on power supply and E-load. The
part starts to operate.
• Pb-Free (RoHS Compliant)
What is Needed
The following instruments will be needed to perform testing:
• Power Supplies
• DC Electronic Load
• Multimeters
Maximum Output Current
The MOSFET current limit is normally 4A and guaranteed
3.8A. This restricts the maximum output current that the
ISL97656 can drive.Table 1 shows typical maximum IOUT
values for 1.2MHz switching frequency and 10µH inductor.
TABLE 1. TYPICAL MAXIMUM IOUT VALUES
• Oscilloscope
• Cables and Wires
VIN
(V)
VOUT
(V)
IOMAX
(mA)
Pinout
2.5
5
1790
2.5
9
990
2.5
12
750
3.3
5
2370
3.3
9
1300
ISL97656
(10L ΜTDFN)
TOP VIEW
COMP
1
10
SS
3.3
12
970
FB
2
9
FREQ
5
9
1970
EN
3
8
IN
5
12
1470
GND
4
7
LX
GND
5
6
LX
Ordering Information
PART NUMBER
DESCRIPTION
ISL97656IRTZEVALZ
Evaluation Board for ISL97656
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2009, 2010. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Application Note 1473
Board Design Schematic
R4
10k
S1
1
2
4
3
R5 SW DIP-2
10k
4700pF
C6
1k
R3
COMP
2
10k
R2
C4
27nF
ISL97656
1
3
R1
88.7k
4
5
VOUT (12V)
SS
FB
FREQ
EN
IN
GND
LX
GND
LX
ISL97656
10
C2
0.1µF
9
1
C1
22µF
7
GNDIN
C3
22µF
C7
CAP
CON1
6
D1
L1
1
CON1
VIN (2.3V to 5.5V)
8
10µH
FY0504SA
1
CON1
NOTE: The thermal pad should connect to signal ground. Both grounds should connect at pins 4 and 5.
FIGURE 1. SCHEMATIC
TABLE 2. ISL97656IRTZEVALZ BILL OF MATERIALS (BOM)
ITEM
QTY
REFERENCE
PART DESCRIPTION
PCB FOOTPRINT
PART NUMBER
1
1
C4
27nF
603
TDK
2
1
C6
4700pF
603
TDK
3
1
C2
0.1µF/16V
603
4
1
R1
88.7k
603
5
3
R2, R4, R5
10k
603
6
1
R3
1k
603
8
1
C3
22µF
9
1
C1
10
1
11
C1068X7R1H104K
VENDOR
TDK
WALSIN
WR06W1002JTL
WALSIN
1206
GRM31CR61C226KE15L
MURATA
22µF
1206
GRM31CR61C226KE15L
MURATA
L1
10µH
SLF12575
SLF12575T-100M5R4-PF
TDK
1
U1
IC
TDFN-10
ISL97656
INTERSIL
12
OPEN
C7
CAP
13
1
VOUT (12V)
CON1
Powerpost
14
1
VIN (2.3V to 5.5V)
CON1
Powerpost
15
1
GNDIN
CON1
Powerpost
16
1
D1
FYD054SA
DPAK
FYD0504SATM
Fairchild
17
1
ISL97656
ISL97656
TDFN-10
18
1
S1
SW DIP-2
DIP4
2
INTERSIL
CKN3001-ND
AN1473.1
May 10, 2010
Application Note 1473
PCB Layout
FIGURE 1. EVALUATION BOARD ASSEMBLY LAYER
FIGURE 2. TOP LAYER
3
AN1473.1
May 10, 2010
Application Note 1473
PCB Layout (Continued)
FIGURE 3. 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 Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
4
AN1473.1
May 10, 2010
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