isl800xxxdemo1z user guide

User Guide 026
ISL800xxxDEMO1Z Demonstration Boards User Guide
Description
Key Features
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, ISL80015A low quiescent current mode
converter.
• Small, compact design
These devices are offered in an 8 Ld 2mmx2mm TDFN
package with 1mm maximum height. The complete converter
occupies less than 64mm2 area.
• VIN range of 2.7V to 5.5V
• IOUT 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:
• VIN = 2.7V to 5.5V
References
ISL80020, ISL80020A, ISL80015, ISL80015A Datasheet
Ordering Information
• VOUT = 1.8V
• IOUT maximum
- 2A for ISL80020, ISL80020A
- 1.5A for ISL80015, ISL80015A
• Switching frequency
- 2MHz for ISL80020A, ISL80015A
- 1MHZ for ISL80020, ISL80015
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
• Up to 95% peak efficiency
FIGURE 1. ISL80020DEMO1Z TOP SIDE
June 1, 2015
UG026.0
1
FIGURE 2. ISL80020DEMO1Z BOTTOM SIDE
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. 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.
User Guide 026
Test Steps
These devices are configured in PWM (Pulse Width Modulation)
for fast transient response, which helps reduce the output noise
and RF interference.
1. Ensure that the circuit is correctly connected to the supply and
loads prior to applying any power.
PCB Layout Guidelines
2. Connect the bias supply to VIN. Plus terminal to VIN (TP1) and
negative return to PGND (TP2).
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, so 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 4 vias ground connection within the pad for the best
thermal relief.
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,
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 small inductor.
ISL80020DEMO1Z Schematic
8
/
9,1
73
9,1
(1
(1 &
8)
&
8)
$
3+$6(
3*1'
6*1'
1&
3*
)%
92
73
)%
$
&
3)
9
5
.
&
8)
&
8)
(3
,6/
5
.
73
73
$
$
$
)25,6/3,1,6(1$1'$/:$<67,(729,13,1,66*1'3238/$7(5 2+0727,(3,172*5281'
)25,6/3,1,69,13,1,6(1:,//&211(&75 .2+065,623(1
9,1
5
23(1
21
(1
5
2))
$
FIGURE 3. ISL80020DEMO1Z SCHEMATIC
Submit Document Feedback
2
UG026.0
June 1, 2015
User Guide 026
Bill of Materials
MANUFACTURER
PART
REFERENCE
QTY UNITS DESIGNATOR
C2012X5R0J226M
4
ea
C1-C4
GRM36COG220J050AQ
1
ea
VLCF4028T-1R2N2R7-2
1
5000
DESCRIPTION
MANUFACTURER
CAP, SMD, 0805, 22µF, 6.3V, 20%, X5R, ROHS
TDK
C5
CAP, SMD, 0402, 22pF, 50V, 5%, NP0, ROHS
MURATA
ea
L1
COIL-PWR INDUCTOR, WW, SMD, 4mm, 1.2µH, 30%, 2.7A, ROHS TDK
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
1
ea
R8
RES, SMD, 0603, 0Ω, 1/16W, TF, ROHS
ERJ-3GEY0R00V
Submit Document Feedback
3
PANASONIC
UG026.0
June 1, 2015
User Guide 026
Board Layout
FIGURE 4. SILKSCREEN TOP
FIGURE 5. LAYER 1
FIGURE 6. LAYER 2
FIGURE 7. LAYER 3
FIGURE 8. LAYER 4
FIGURE 9. SILKSCREEN BOTTOM
Submit Document Feedback
4
UG026.0
June 1, 2015
User Guide 026
Typical Performance Curves
100
VIN 5V/DIV
EFFICIENCY (%)
90
VOUT 1V/DIV
80
2.5VOUT
70
1.5VOUT
1.8VOUT
3.3VOUT
IL 1A/DIV
60
50
PG 5V/DIV
40
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
OUTPUT LOAD (A)
500µs/DIV
FIGURE 10. EFFICIENCY vs LOAD, fSW = 2MHz, VIN = 5V, TA = +25°C
FIGURE 11. START-UP VIN AT 2A LOAD, fSW = 2MHz, VIN = 5V,
TA = +25°C
VIN 5V/DIV
VOUT 0.5V/DIV
IL 1A/DIV
IL 1A/DIV
VOUT 1V/DIV
PG 5V/DIV
PG 5V/DIV
1ms/DIV
FIGURE 12. SHUTDOWN VIN AT 2A LOAD, fSW = 2MHz, VIN = 5V,
TA = +25°C
500µs/DIV
FIGURE 13. OVERCURRENT PROTECTION, fSW = 2MHz, VIN = 5V,
TA = +25°C
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
Submit Document Feedback
5
UG026.0
June 1, 2015