Page 1
USER’S MANUAL
LX
LX
BOOT
EN
LX
LX
PGND
VCC5
SYNC
RTCT
SGND
PGOOD
REF
FB
SS
VIN
VIN
VIN
VIN
1
2
3
4
5
678910
15
14
13
12
11
20 19 18 17 16
ISL8560EVAL2Z
Evaluation Board
The ISL8560 is a step down DC/DC power switching
regulator which accepts a 9V to 60V input, and provides up
to 2A of output current. The output voltage can be set
between 1.21V and 35V by means of an external resistor
divider. The device uses an internal power DMOS transistor
with a typical r
and high switching speed. A switching frequency in the
range of 100kHz to 600kHz can be realized (the maximum
power dissipation of the various packages must be
observed). Notable features of this next generation DC/DC
converter include pulse-by-pulse current limit for FET
protection, hiccup-mode short circuit protection, voltage
feedforward, frequency SYNC, soft-start, low standby
current of 60µA typical in the disabled state and thermal
shut-down. The device is available in a 20 Ld QFN package.
Ordering Information
PART
NUMBER
(Note)
ISL8560IRZ ISL 8560IRZ -40 to +85 20 Ld 6x6 QFN L20.6x6B
ISL8560IRZ-T* ISL 8560IRZ -40 to +85 20 Ld 6x6 QFN L20.6x6B
ISL8560EVAL2Z Evaluation Board
*Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets; molding compounds/die attach
materials and 100% matte tin plate PLUS ANNEAL - e3 termination
finish, which is RoHS compliant and compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J STD-020.
of 0.19 to obtain very high efficiency
DS(ON)
TEMP.
PART
MARKING
RANGE
(°C)
PACKAGE
(Pb-free)
PKG.
DWG. #
AN1324
Rev 3.00
February 13, 2008
Features
• Voltage feedforward
• Step down DC/DC supporting up to 2A
• Input voltage range of 9V to 60V
• Internal reference of 1.21V ±1%
• Adjustable output voltage range of 1.21V to 35V
• Adjustable switching frequency 100kHz to 600kHz
• Frequency SYNC pin
• Zero load current operation
• Pulse-by-pulse mode current limit
• Hiccup mode short-circuit protection
• Low standby current of 60µA typical
• Thermal shut-down
• Transient survival up at 100V for 400ms
• Pb-free (RoHS compliant)
Applications
• Industrial and automotive power supplies
• Portable computers
• Battery chargers
• Distributed power systems
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
AN1324 Rev 3.00 Page 1 of 8
February 13, 2008
Pinouts
ISL8560
(20 LD QFN)
TOP VIEW
Page 2
ISL8560EVAL2Z
R1R2V
OUTVFB1
1–=
(EQ. 1)
C16nF
6.25
R
7
k
--------------------
1000
f
OSC
kHz
------------------------------
0.3–
=
(EQ. 2)
What’s Inside
The Evaluation Board Kit contains the following materials:
• The ISL8560EVAL2Z REVB board.
• The ISL8560 datasheet.
• ISL8560 Evaluation Board Application Note.
Recommended Equipment
The following equipment is recommended to evaluate the
performance of the board:
• 0V to 100V power supply with at least 5A current sourcing
capability.
• Electronic Loads capable of sinking current up to 5A.
• Digital Multimeters (DMMs.)
• 100MHz quad-trace Oscilloscope.
• Signal generator (to test the SYNC feature only).
Quick Setup Guide
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, with the positive terminal
connected to P1(VIN), and the return to P2(GND).
3. Connect the load across the output terminals, between
pins P3 (positive) and P4 (return).
4. Verify that the jumper JP1 is connected.
5. Apply a voltage between 9V and 60V across the input.
6. Verify that the output voltage is 5V.
Evaluating the Other Output Voltage
The ISL8560EVAL2Z kit output is preset to 5V. The output
voltage can be adjusted from 1.21V to 55V by Equation 1:
with R
= 51.1k and V
2
= 1.21V.
FB1
Note: The inductor, output capacitors and the compensation
network may need to be tweaked, along with the
corresponding compensation network, for optimal
performance with change in output voltage and/or load. Also,
additional heatsinking or airflow may required to insure that
the junction temperature does not exceed +125°C.
Frequency
The ISL8560EVAL2Z kit is preset at 500kHz. The
ISL8560EVAL2Z can be adjusted to operate at switching
frequencies from 100kHz to 600kHz. Use C
to program
16
the switching frequency using Equation 2:
Synchronization
The ISL8560EVAL2Z circuit may be synchronized to a TTL
signal that is set at a higher switching frequency than the
pre-set frequency. The range of the external synchronizing
frequency is from 100kHz to 600kHz. It is recommended to
use and RTCT capacitor (C
configuration.
TABLE 1. SWITCH 1 SETTINGS
JP1 ENABLE OPERATING MODE
1 OPEN Unit Disabled
2 GND Unit Enabled
) of 2700pF in this
16
AN1324 Rev 3.00 Page 2 of 8
February 13, 2008
Page 3
AN1324 Rev 3.00 Page 3 of 8
February 13, 2008
ISL8560EVAL2Z
Schematic
Page 4
ISL8560EVAL2Z
TABLE 2. COMPONENT LIST
REF DES QTY VALUE TOL. VOLTAGE PACKAGE PART NUMBER MANUFACTURER DESCRIPTION
C5, C10, C11 3 0.10µF 10% 50V 0603 C1608X7R1H104K-T TDK CAPACITOR, SMD, 0603,
C12-C14 3 150µF 20% 25V 8mmx10mm EEE-FK1E151P-T PANASONIC CAPACITOR, SMD, 10.3mm,
C1-C3 3 47µF 20 100V 12.5mmx13.5mm EEV-FK2A470Q-T PANASONIC CAPACITOR, SMD, H13, 47µF,
C7,C9 2 100pF 5% 50V 0603 H1045-00101-50V5-T AVX, Samsung,
TDK, Murata,
Vishay
C15 1 0.01µF 10% 50V 0603 H1045-00103-50V10-T AVX, Samsung,
TDK, Murata,
Vishay
C18 1 1µF 10% 16V 0603 H1045-00105-16V10-T AVX, Samsung,
TDK, Murata,
Vishay
C19 1 390pF 5% 50V 0603 H1045-00391-50V5-T AVX, Samsung,
TDK, Murata,
Vishay
C8, C17 0 OPEN - - - H1045-DNP AVX, Samsung,
TDK, Murata,
Vishay
C6 1 1.0µF 10% 25V 0805 H1046-00105-25V10-T AVX, Samsung,
TDK, Murata,
Vishay
C4 1 0.1µF 10% 100V 1206 H1065-00104-100V10-T AVX, Samsung,
TDK, Murata,
Vishay
C16 1 47pF 5% 50V 1206 H1065-00471-100V5-T AVX, Samsung,
TDK, Murata,
Vishay
L1 1 22µH 20% - 18mmx15mm DO5010H-223MLB COILCRAFT COIL-PWR INDUCTOR, SMD,
JP1 1 0 - - Header SPC02SYAN SULLINS CONN-JUMPER, 2 PIN,
D1 1 5A 100V Power DI-5 PDS5100H DIODES INC. DIODE-RECTIFIER, SMD,
U1 1 2A - 72V 6x6 QFN ISL8560IRZ INTERSIL IC-STEP DOWN DC/DC
R9 1 20 1% 100V 0603 H2511-0200-1/10W1-T PANASONIC RESISTOR, SMD, 0603, 20,
R5, R6, R8 3 10k 1% 100V 0603 H2511-1002-1/16W1-T PANASONIC RESISTOR, SMD, 0603, 10k,
R1 1 16.2k 1% 100V 0603 H2511-1622-1/16W1-T PANASONIC RESISTOR, SMD, 0603, 16.2k,
R4 1 301k 1% 100V 0603 H2511-3013-1/10W1-T YAGEO RESISTOR, SMD, 0603, 301k,
R2 1 51.1k 1% 100V 0603 H2511-05112-1/16W1-T PANASONIC RESISTOR, SMD, 0603, 51.1k,
R3 1 5.62k 1% 100V 0603 H2511-5621-1/16W1-T PANASONIC RESISTOR, SMD, 0603, 5.62k,
R7 1 20k 1% 100V 0603 H2513-02002-1/4W1-T PANASONIC RESISTOR, SMD, 1206, 20k,
R10 1 0 1% 100V 0603 H2515-00R00-1W-T VENKEL RESISTOR, SMD, 2512, 0,
0.10µF, 50V, 10%, X7R
150µF, 25V, 20%, ROHS,
ALUM. ELEC.
100V, 20%, ROHS, ALUM.
ELEC.
CAPACITOR, SMD, 0603,
100pF, 50V, 5%, NPO, ROHS
CAPACITOR, SMD, 0603,
0.01µF, 50V, 10%, X7R, ROHS
CAPACITOR, SMD, 0603, 1µF,
16V, 10%, X7R, ROHS
CAPACITOR, SMD, 0603,
390pF, 50V, 5%, NPO, ROHS
CAPACITOR, SMD, 0603,
DNP-PLACE HOLDER, ROHS
CAPACITOR, SMD, 0805,
1.0uF, 25V, 10%, X7R, ROHS
CAPACITOR, SMD, 1206,
0.1µF, 100V, 10%, X7R, ROHS
CAPACITOR, SMD, 1206, 47pF,
50V, 5%, NPO, ROHS
18x15, 22µH, 20%, 7A, ROHS,
47m
SHUNT, ROHS
Power DI-5,100V, 5A, ROHS,
SCHOTTKY
CONVERTER, 20P, QFN, 6x6,
ROHS
1/10W, 1%, TF, ROHS
1/16W, 1%, TF, ROHS
1/16W, 1%, TF, ROHS
1/10W, 1%, TF, ROHS
1/16W, 1%, TF, ROHS
1/16W, 1%, TF, ROHS
1/4W, 1%, TF, ROHS
1W, TF, ROHS
AN1324 Rev 3.00 Page 4 of 8
February 13, 2008
Page 5
ISL8560EVAL2Z
ISL8560EVAL2Z Board Layout
FIGURE 1. TOP COMPONENTS
AN1324 Rev 3.00 Page 5 of 8
February 13, 2008
FIGURE 2. TOP LAYER ETCH
Page 6
ISL8560EVAL2Z
ISL8560EVAL2Z Board Layout (Continued)
FIGURE 3. 2ND LAYER ETCH
AN1324 Rev 3.00 Page 6 of 8
February 13, 2008
FIGURE 4. 3RD LAYER ETCH
Page 7
ISL8560EVAL2Z
ISL8560EVAL2Z Board Layout (Continued)
FIGURE 5. BOTTOM LAYER COMPONENTS (MIRRORED)
AN1324 Rev 3.00 Page 7 of 8
February 13, 2008
FIGURE 6. BOTTOM LAYER ETCH (MIRRORED)
Page 8
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