Intersil ISL800 DEMO1Z Series User manual

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User Guide 026
ISL800xxxDEMO1Z Demonstration Boards User Guide
Description
The ISL800xxxDEMO1Z boards are intended for use by
individuals with requirements for point-of-load applications
sourcing from 2.7V to 5.5V. The ISL800xxxDEMO1Z boards are
used to demonstrate the performance of the ISL80020,
ISL80020A, ISL80015, and ISL80015A low quiescent current
mode converter.
These devices are offered in an 8 Ld 2mmx2mm TDFN
package with 1mm maximum height. The complete converter
occupies less than 64mm2area.
Specifications
These boards have been configured and optimized for the
following operating conditions:
•V
IN = 2.7V to 5.5V
•V
OUT = 1.8V
•I
OUT maximum
- 2A for ISL80020, ISL80020A
- 1.5A for ISL80015, ISL80015A
•Switchingfrequency
- 2MHz for ISL80020A, ISL80015A
- 1MHZ for ISL80020, ISL80015
• Up to 95% peak efficiency
Key Features
•Small,compactdesign
•V
IN range of 2.7V to 5.5V
•I
OUT maximum is 2A or 1.5A
• Switching frequency is 1MHz or 2MHz
• Negative current protection
• Internal soft-start and soft-stop
• Overcurrent and short-circuit protection
• Over-temperature/thermal protection
Related Literature
• For a full list of related documents, visit our website
-ISL80020, ISL80020A, ISL80015, and ISL80015A
product pages
Ordering Information
PART NUMBER DESCRIPTION
ISL80020DEMO1Z 2A, 1MHz demonstration board
ISL80020ADEMO1Z 2A, 2MHz demonstration board
ISL80015DEMO1Z 1.5A, 1MHz demonstration board
ISL80015ADEMO1Z 1.5A, 2MHz demonstration board
FIGURE 1. BLOCK DIAGRAM
TP1
TP2
TP3
TP4
VIN VOUT
PGND PGND
ISL800xxx
CIN COUT
R1
R2
L
CFF
February 3, 2017
UG026.1
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 2015, 2017. 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.

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Test Steps
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. Plus terminal to VIN (TP1) and
negative return to PGND (TP2).
3. Connect the output load to VO (TP3), and the negative return
to PGND (TP4).
4. Turn on the power supply.
5. Verify the output voltage is 1.8V for VOUT.
Functional Description
The ISL800xxxDEMO1Z boards provide a simple platform to
evaluate performance of the ISL80020, ISL80020A, ISL80015,
and ISL80015A.
These devices are highly efficient, monolithic, synchronous
step-down DC/DC converters that can deliver up to 1.5A or 2A of
continuous output current from a 2.7V to 5.5V input supply. They
use peak current mode control architecture to allow very low duty
cycle operation. The devices operate at 1MHz or 2MHz switching
frequency, thereby providing superior transient response and
allowing for the use of a small inductor.
These devices are configured in PWM (Pulse Width Modulation)
for fast transient response, which helps reduce the output noise
and RF interference.
PCB Layout Guidelines
The PCB layout is a very important converter design step to make
sure the designed converter works well. The power loop is
composed of the output inductor L’s, the output capacitor COUT,
the PHASE’s pins, and the PGND pin. It is necessary to make the
power loop as small as possible and the connecting traces
among them should be direct, short, and wide. The switching
node of the converter, the PHASE pins, and the traces connected
to the node are very noisy. Therefore, keep the voltage feedback
trace away from these noisy traces. The input capacitor should
be placed as close as possible to the VIN pin and the ground of
the input and output capacitors should be connected as closely
as possible. The heat of the IC is mainly dissipated through the
thermal pad. Maximizing the copper area connected to the
thermal pad is preferable. In addition, a solid ground plane is
helpful for better EMI performance. It is recommended to add at
least four vias to the ground connection within the pad for the
best thermal relief.
FIGURE 2. ISL80020DEMO1Z TOP SIDE FIGURE 3. ISL80020DEMO1Z BOTTOM SIDE

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ISL80020DEMO1Z Schematic
FIGURE 4. ISL80020DEMO1Z SCHEMATIC
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Bill of Materials
MANUFACTURER
PART QTY UNITS
REFERENCE
DESIGNATOR DESCRIPTION MANUFACTURER
C2012X5R0J226M 4 ea C1-C4 CAP, SMD, 0805, 22µF, 6.3V, 20%, X5R, ROHS TDK
GRM36COG220J050AQ 1 ea C5 CAP, SMD, 0402, 22pF, 50V, 5%, NP0, ROHS Murata
74437324012 (ISL80020ADEMO1Z)
74437324022 (ISL80020DEMO1Z)
74437324012 (ISL80015ADEMO1Z)
74437324022 (ISL80015DEMO1Z)
1 ea L1 COIL-PWR INDUCTOR, WW, SMD, 4mm, ROHS Wurth
Elektronics
5000 2 ea TP1, TP3 CONN-MINI TEST PT, VERTICAL, RED, ROHS Keystone
5001 2 ea TP2, TP4 CONN-MINI TEST PT, VERTICAL, BLK, ROHS Keystone
ISL80020AIRZ (ISL80020ADEMO1Z)
ISL80020IRZ (ISL80020DEMO1Z)
ISL80015IRZ (ISL80015DEMO1Z)
ISL80015AIRZ (ISL80015ADEMO1Z)
1 ea U1 IC-2A, 2MHz BUCK REGULATOR, 8P, TDFN, 2X2, ROHS
IC-2A, 1MHz BUCK REGULATOR, 8P, TDFN, 2X2, ROHS
IC-1.5A, 1MHz BUCK REGULATOR, 8P, TDFN, 2X2, ROHS
IC-1.5A, 2MHz BUCK REGULATOR, 8P, TDFN, 2X2, ROHS
Intersil
ERJ2RKF1003 1 ea R2 RES, SMD, 0402, 100k, 1/16W, 1%, TF, ROHS Panasonic
MCR01MZPF2003 1 ea R1 RES, SMD, 0402, 200k, 1/16W, 1%, TF, ROHS Rohm
0 ea R7 RES, SMD, 0402, DNP, DNP, DNP, TF, ROHS
ERJ-3GEY0R00V 1 ea R8 RES, SMD, 0603, 0Ω, 1/16W, TF, ROHS Panasonic

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Board Layout
FIGURE 5. SILKSCREEN TOP FIGURE 6. LAYER 1
FIGURE 7. LAYER 2 FIGURE 8. LAYER 3
FIGURE 9. LAYER 4 FIGURE 10. SILKSCREEN BOTTOM

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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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Typical Performance Curves
FIGURE 11. EFFICIENCY vs LOAD, fSW = 2MHz, VIN = 5V, TA= +25°C FIGURE 12. START-UP VIN AT 2A LOAD, fSW = 2MHz, VIN = 5V,
TA= +25°C
FIGURE 13. SHUTDOWN VIN AT 2A LOAD, fSW = 2MHz, VIN = 5V,
TA= +25°C
FIGURE 14. OVERCURRENT PROTECTION, fSW = 2MHz, VIN = 5V,
TA= +25°C
40
50
60
70
80
90
100
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
EFFICIENCY (%)
OUTPUT LOAD (A)
1.8VOUT
1.5VOUT
2.5VOUT 3.3VOUT
500µs/DIV
VIN 5V/DIV
VOUT 1V/DIV
IL 1A/DIV
PG 5V/DIV
1ms/DIV
VIN 5V/DIV
VOUT 1V/DIV
IL 1A/DIV
PG 5V/DIV
500µs/DIV
VOUT 0.5V/DIV
IL 1A/DIV
PG 5V/DIV