an1929

Application Note 1929
ISL85413EVAL1Z, ISL85412EVAL1Z Evaluation Boards
Description
Key Features
The ISL85413EVAL1Z, ISL85412EVAL1Z kits are intended for
use in point-of-load applications sourcing from 3.5V to 40V.
The kits are used to demonstrate the performance of the
ISL85413, ISL85412 Wide VIN Low Quiescent Current High
Efficiency Synchronous Buck Regulator with 300mA or
150mA output current.
• Small, compact design
The ISL85413, ISL85412 are offered in a 3mmx3mm 8 Ld
DFN package with 1mm maximum height.
Specifications
The evaluation boards are designed to operate at the following
operating conditions:
• Switch selectable EN (enable/disabled)
• Switch selectable MODE (auto PFM/forced PWM)
• Connectors, test points and jumpers for easy probing
References
• Reference ISL85413 and ISL85412 datasheets for
efficiency and typical performance curves
Ordering Information
PART NUMBER
DESCRIPTION
• Input voltage rating from 3.5V to 40V
ISL85413EVAL1Z
Evaluation Board (300mA Output Current)
• Fixed 3.3V output voltage
ISL85412EVAL1Z
Evaluation Board (150mA Output Current)
• Up to 300mA output current (ISL85413), up to 150mA
output current (ISL85412)
• 700kHz switching frequency
• Operating junction temperature range: -40°C to +125°C
FIGURE 1. FRONT OF EVALUATION BOARD ISL85413EVAL1Z
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1
FIGURE 2. BACK OF EVALUATION BOARD ISL85413EVAL1Z
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2014, 2015. 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 1929
Functional Description
Quick Setup Guide
The ISL85413EVAL1Z, ISL85412EVAL1Z provide simple
platforms to demonstrate the features of the ISL85413,
ISL85412 wide input synchronous buck regulator. The
ISL85413EVAL1Z is for 300mA output current and
ISL85412EVAL1Z is for 150mA output current. The evaluation
boards have been functionally optimized for best performance of
the ISL85413, ISL85412 ICs.
The ISL85413EVAL1Z board is shown in Figures 1 and 2. The
evaluation board contains an S1 switch that enables or disables
the part, thus allowing low quiescent current state. The MODE
function is controlled by a S2 switch that allows different mode
operation. Default board configuration has R6 = 200k to VCC,
which defaults to PWM operation mode. If this pin is tied to GND,
the IC will operate in PFM mode.
The schematic of the ISL85413EVAL1Z evaluation board is
shown on page 3. The PCB layout images for top and bottom
layers are shown in Figures 3 and 4. The Bill of Materials of the
ISL85413EVAL1Z and ISL85412EVAL1Z is shown on page 3.
1. Ensure that the circuit is correctly connected to the supply and
loads prior to applying any power.
2. Connect the bias supply to VIN, the plus terminal to VIN and
the negative return to GND1.
3. Verify that the position is ON for S1.
4. Turn on the power supply.
5. Verify the output voltage is 3.3V for VOUT.
Evaluating the Other Output Voltage
The ISL85413VAL1Z and ISL85412VAL1Z kit outputs are preset
to 3.3V; however, output voltages can be adjusted from 0.6V to
12V. The output voltage programming resistor, R2, will depend
on the desired output voltage of the regulator. The value for the
feedback resistor is typically between 0Ω and 50kΩ as shown in
Equation 1.
0.6
R 2 = R 1  ------------------------------
V

OUT – 0.6
(EQ. 1)
If the output voltage desired is 0.6V, then R1 is shorted.
Operating Range
The VIN range of the boards is 3.5V to 40V. The VOUT range is
0.6V to 12V. The operating junction temperature range is -40°C
to +125°C.
Table 1 shows the component selection that should be used for
the respective VOUT.
Recommended Equipment
The following materials are recommended to perform testing:
• 0V to 50V power supply with at least 2A source current
capability
• Electronic loads capable of sinking current up to 1.5A
• Digital Multimeters (DMMs)
• 100MHz quad-trace oscilloscope
• Signal generator
TABLE 1. EXTERNAL COMPONENT SELECTION (REFER TO Figure 1)
VOUT
(V)
C4
(pF)
C8
(µF)
L1
(µH)
R1
(kΩ)
R2
(kΩ)
1.0
100
2x22
10
90.9
137
1.2
100
2x22
10
90.9
90.9
1.5
100
2x22
16
90.9
60.4
1.8
100
2x22
16
90.9
45.3
2.5
100
22
22
90.9
28.7
3.3
100
22
33
90.9
20.0
5.0
100
22
47
90.9
12.4
12
100
22
100
90.9
4.75
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Application Note 1929
ISL85413EVAL1Z Schematic
JVO
1
2
VO
1
C1
10UF
C2
10UF
L1
VO
C8
C7
33UH
22UF 22UF
GND2
JLX
4
A
1
FB 8
8
VCC 7
7
1MODE
2
2BOOT
3
3VIN
PG 6
4
4PHASE
EN 5
9
EP
A
1
2
VCC
VCC
6PG
5EN
ISL85413FRZ
C5
R3
C4
20
VO
100PF
R2
1UF
90.9K
20K
A
A
3
C3
150UF
C6
0.1UF
VIN
2
GND1
MODE
A
VIN
R1
U1
3
4
A
A
VCC
VIN
R5
200K
EN
2
ON
3
S1 1
MODE
S2 1
PFM
R7
OFF
R6
2
PWM
3
PG
PG
1
D1
A
Q1
1
DNP
DNP
2.05K
2N7002
2
EN
MODE
R9
R8
200K
32
R4
200K
A
A
ISL85413EVAL1Z, ISL85412EVAL1Z Bill of Materials
MANUFACTURER PART
REFERENCE
DESIGNATOR
QTY
UNITS
ISL85413EVAL1ZREVAPCB
1
ea
SEE LABELRENAME BOARD
C1608X7R1C105K
1
ea
EEE-FK1H151P
1
06035C104KAT2A
DESCRIPTION
MANUFACTURER
PWB-PCB, ISL85413EVAL1Z, REVA,
ROHS
TBD
C5
CAP, SMD, 0603, 1.0µF, 16V, 10%, X7R,
ROHS
TDK
ea
C3
CAP, SMD, 10.3mm, 150µF, 50V, 20%,
ROHS, ALUM.ELEC.
PANASONIC
1
ea
C6
CAP, SMD, 0603, 0.1µF, 50V, 10%, X7R,
ROHS
AVX
ECJ-1VC1H331J
1
ea
C4
CAP, SMD, 0603, 100pF, 50V, 5%, NP0,
ROHS
PANASONIC
C3216X5R1H106K
2
ea
C1, C2
CAP, SMD, 1206, 10µF, 50V, 10%, X5R,
ROHS
TDK
GRM31CR60J226KE19L
1
ea
C7
CAP, SMD, 1206, 22µF, 6.3V, 10%, X5R,
ROHS
MURATA
0
ea
C8
CAP, SMD, 1206, DNP-PLACE HOLDER,
ROHS
DR73-330-R
1
ea
L1
COIL-PWR INDUCTOR, SMD, 7.6mm,
33µH, 20%, 1.31A, ROHS
131-4353-00
2
ea
JLX, JVO
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COOPER/
COILTRONICS
CONN-SCOPE PROBE TEST PT, COMPACT, TEKTRONIX
PCB MNT, ROHS
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Application Note 1929
ISL85413EVAL1Z, ISL85412EVAL1Z Bill of Materials
(Continued)
QTY
UNITS
REFERENCE
DESIGNATOR
1514-2
4
ea
VO, VIN, GND1, GND2
CONN-TURRET, TERMINAL POST, TH,
ROHS
KEYSTONE
5000
4
ea
EN, PG, VCC, SYNC
CONN-MINI TEST PT, VERTICAL, RED,
ROHS
KEYSTONE
LTST-C190KGKT
1
ea
D1
LED, SMD, 0603, GREEN CLEAR, 2V,
20mA, 571nm, 35mcd, ROHS
LITEON/VISHAY
ISL85412FRZ for ISL85412EVAL1Z
1
ea
U1
IC-150mA BUCK REGULATOR, 12P, DFN, INTERSIL
3X3, ROHS
ISL85413FRZ for ISL85413EVAL1Z
1
ea
U1
IC-300mA BUCK REGULATOR, 12P, DFN, INTERSIL
3X3, ROHS
2N7002-7-F
1
ea
Q1
TRANSISTOR, N-CHANNEL, 3LD, SOT-23, DIODES, INC.
60V, 115mA, ROHS
0
ea
R6, R7
RESISTOR, SMD, 0603, 0.1%, MF, DNPPLACE HOLDER
ERJ-3EKF20R0V
1
ea
R3
RES, SMD, 0603, 20Ω, 1/10W, 1%, TF,
ROHS
PANASONIC
CR0603-10W-2002FT
1
ea
R2
RES, SMD, 0603, 20k, 1/10W, 1%, TF,
ROHS
VENKEL
CR0603-10W-2003FT
3
ea
R4, R5, R8
RES, SMD, 0603, 200k, 1/10W, 1%, TF,
ROHS
VENKEL
CR0603-10W-2051FT
1
ea
R9
RES, SMD, 0603, 2.05k, 1/10W, 1%, TF, VENKEL
ROHS
ERJ-3EKF9102V
1
ea
R1
RES, SMD, 0603, 91k, 1/10W, 1%, TF,
ROHS
PANASONIC
GT11MSCBE
2
ea
S1, S2
SWITCH-TOGGLE, SMD, 6PIN, SPDT,
2POS, ON-ON, ROHS
ITT INDUSTRIES/
C&K DIVISION
MANUFACTURER PART
DESCRIPTION
MANUFACTURER
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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Application Note 1929
ISL85413EVAL1Z Board Layout
FIGURE 3. SILK SCREEN TOP
FIGURE 4. TOP LAYER COMPONENT SIDE
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Application Note 1929
ISL85413EVAL1Z Board Layout (Continued)
FIGURE 5. LAYER 2
FIGURE 6. LAYER 3
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Application Note 1929
ISL85413EVAL1Z Board Layout (Continued)
FIGURE 7. LAYER 4
FIGURE 8. SILK SCREEN BOTTOM
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