USER’S MANUAL
ISL800xxxDEMO1Z
Demonstration Boards
UG026
Rev 1.00
February 3, 2017
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 64mm
2
area.
Key Features
• Small, compact design
• 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
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
• Switching frequency
- 2MHz for ISL80020A, ISL80015A
- 1MHZ for ISL80020, ISL80015
• Up to 95% peak efficiency
Related Literature
• For a full list of related documents, visit our website
-
ISL80020, ISL80020A, ISL80015,
and
ISL80015A
product pages
Ordering Information
PART NUMBER
ISL80020DEMO1Z
ISL80020ADEMO1Z
ISL80015DEMO1Z
ISL80015ADEMO1Z
DESCRIPTION
2A, 1MHz demonstration board
2A, 2MHz demonstration board
1.5A, 1MHz demonstration board
1.5A, 2MHz demonstration board
L
VIN
TP1
TP3
VOUT
C
FF
R
1
C
IN
ISL800xxx
C
OUT
R
2
PGND
TP2
TP4
PGND
FIGURE 1. BLOCK DIAGRAM
UG026 Rev 1.00
February 3, 2017
Page 1 of 6
ISL800xxxDEMO1Z
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
.
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 C
OUT
,
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.
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.
FIGURE 2. ISL80020DEMO1Z TOP SIDE
FIGURE 3. ISL80020DEMO1Z BOTTOM SIDE
UG026 Rev 1.00
February 3, 2017
Page 2 of 6
ISL800xxxDEMO1Z
ISL80020DEMO1Z Schematic
FIGURE 4. ISL80020DEMO1Z SCHEMATIC
Bill of Materials
MANUFACTURER
PART
C2012X5R0J226M
GRM36COG220J050AQ
74437324012 (ISL80020ADEMO1Z)
74437324022 (ISL80020DEMO1Z)
74437324012 (ISL80015ADEMO1Z)
74437324022 (ISL80015DEMO1Z)
5000
5001
ISL80020AIRZ (ISL80020ADEMO1Z)
ISL80020IRZ (ISL80020DEMO1Z)
ISL80015IRZ (ISL80015DEMO1Z)
ISL80015AIRZ (ISL80015ADEMO1Z)
ERJ2RKF1003
MCR01MZPF2003
REFERENCE
QTY UNITS DESIGNATOR
4
1
1
ea
ea
ea
C1-C4
C5
L1
DESCRIPTION
CAP, SMD, 0805, 22µF, 6.3V, 20%, X5R, ROHS
CAP, SMD, 0402, 22pF, 50V, 5%, NP0, ROHS
COIL-PWR INDUCTOR, WW, SMD, 4mm, ROHS
MANUFACTURER
TDK
Murata
Wurth
Elektronics
2
2
1
ea
ea
ea
TP1, TP3
TP2, TP4
U1
CONN-MINI TEST PT, VERTICAL, RED, ROHS
CONN-MINI TEST PT, VERTICAL, BLK, ROHS
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
RES, SMD, 0402, 100k, 1/16W, 1%, TF, ROHS
RES, SMD, 0402, 200k, 1/16W, 1%, TF, ROHS
RES, SMD, 0402, DNP, DNP, DNP, TF, ROHS
RES, SMD, 0603, 0Ω, 1/16W, TF, ROHS
Keystone
Keystone
Intersil
1
1
0
ea
ea
ea
ea
R2
R1
R7
R8
Panasonic
Rohm
ERJ-3GEY0R00V
1
Panasonic
UG026 Rev 1.00
February 3, 2017
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ISL800xxxDEMO1Z
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
UG026 Rev 1.00
February 3, 2017
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ISL800xxxDEMO1Z
Typical Performance Curves
100
90
V
OUT
1V/DIV
EFFICIENCY (%)
80
70
60
50
40
PG 5V/DIV
2.5V
OUT
1.5V
OUT
1.8V
OUT
3.3V
OUT
V
IN
5V/DIV
I
L
1A/DIV
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
500µs/DIV
OUTPUT LOAD (A)
FIGURE 11. EFFICIENCY vs LOAD, f
SW
= 2MHz, V
IN
= 5V, T
A
= +25°C
FIGURE 12. START-UP V
IN
AT 2A LOAD, f
SW
= 2MHz, V
IN
= 5V,
T
A
= +25°C
V
IN
5V/DIV
V
OUT
0.5V/DIV
I
L
1A/DIV
I
L
1A/DIV
V
OUT
1V/DIV
PG 5V/DIV
1ms/DIV
500µs/DIV
PG 5V/DIV
FIGURE 13. SHUTDOWN V
IN
AT 2A LOAD, f
SW
= 2MHz, V
IN
= 5V,
T
A
= +25°C
FIGURE 14. OVERCURRENT PROTECTION, f
SW
= 2MHz, V
IN
= 5V,
T
A
= +25°C
UG026 Rev 1.00
February 3, 2017
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