an1817

Application Note 1817
ISL8002xDEMO1Z and ISL80019xDEMO1Z
Demonstration Board User Guide
Description
Key Features
The ISL8002, ISL80019, ISL8002A, ISL8002D and ISL80019A
DEMO1Z kits are intended for use by individuals with requirements
for Point-of-Load applications sourcing from 2.7V to 5.5V. The
ISL8002DEMO1Z and ISL80019DEMO1Z boards are used to
demonstrate the performance of the ISL8002 and ISL80019 low
quiescent current mode converters.
• High efficiency synchronous buck regulator with up to 95%
efficiency
The ISL8002 and ISL8019 are offered in a 8 pin 2mmx2mm
TDFN package with 1mm maximum height. The complete
converter occupies less than 64mm2 area.
• Soft-stop output discharge during disable
• 0.8% reference accuracy over temperature/load/line
• Start-up with prebiased output
• Internal soft-start - 1ms
• 1MHz, 2MHz default frequency
• Negative OC protection
TABLE 1. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
IOUT
(MAX)
(A)
FSW
(MHz)
ISL80019
1.5
1
ISL80019A
1.5
2
ISL8002
2
1
ISL8002A
2
2
ISL8002D
2
2
PART#
TP1
VIN RANGE
(V)
VOUT RANGE
(V)
2.7 to 5.5
0.6 to 5.5
Ordering Information
PACKAGE
SIZE
PART NUMBER
8 pin
2mmx2mm
TDFN
ISL8002DEMO1Z
Switching frequency 1MHZ; Output current:
2A; PG rising /falling delay time: 1ms/15µs
ISL8002ADEMO1Z
Switching frequency 2MHZ; Output current:
2A; PG rising /falling delay time: 1ms/15µs
ISL80019DEMO1Z
Switching frequency 1MHZ ; Output current:
1.5A; PG rising /falling delay time: 1ms/15µs
ISL80019ADEMO1Z
Switching frequency 2MHZ; Output current:
1.5A; PG rising /falling delay time: 1ms/15µs
ISL8002DDEMO1Z
Switching frequency 2MHZ; Output current:
2A; PG rising /falling delay time:
390µs/330µs
U1
VIN
VIN
EN
MODE
C2
C1
22UF 22µF
22UF
22µF
1
2
3
4
9
A
TP2
VIN
EN
MODE
PG
EP
PHASE
PGND
FB
COMP
L1
2
1.2UH
1.2µH
A
VO
VO
R1
C5
22PF
22pF 200kΩ
ISL8002
C6
220PF
220pF
R14
100kΩ
A
1
8
7
6
5
DESCRIPTION
C7
OPEN
R12
DNP
C3
22µF
TP3
C4
22UF
22µF
R2
100kΩ
TP4
A
A
VIN
VIN
A
VIN
VIN
VIN
VIN
R7
100kΩ
ON
R6
100kΩ
PWM
R9
OPEN
PFM
MODE
EN EN
R8
OPEN
OFF
A
A
FIGURE 1. ISL8002DEMO1Z SCHEMATIC
March 10, 2015
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
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Application Note 1817
ISL8002EVAL2Z Evaluation Board
FIGURE 2. TOP SIDE
FIGURE 3. BOTTOM SIDE
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Application Note 1817
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. 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.
Recommended Equipment
The following materials are recommended to perform testing:
• 0V to 10V power supply with at least 5A source current
capability or 5V battery
• Electronic loads capable of sinking current up to 7A
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 pin 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 closely 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 best thermal
relief.
• Digital Multimeters (DMMs)
• 100MHz quad-trace oscilloscope
Signal generator
FIGURE 4. SILKSCREEN TOP
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FIGURE 5. SILKSCREEN BOTTOM
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Application Note 1817
TABLE 2. BILL OF MATERIALS
PART NUMBER
QTY UNITS
REFERENCE
DESIGNATOR
COMMENT
DESCRIPTION
MANUFACTURER
H1044-00220-50V5-T
1
ea.
C5
CAP, SMD, 0402,
22pF, 50V, 5%, NP0
H1044-00221-50V5-T
1
ea.
C6
CAP, SMD, 0402,
PANASONIC, TDK
220pF, 50V, 5%, C0G
H1044-DNP
0
ea.
C7
CAP, SMD, 0402,
DNP-PLACE HOLDER
H1046-00226-6R3V10-T
4
ea.
C1, C2, C3, C4
CAP, SMD, 0805, 22µF, JOHANSON DIELECTRICS 6R3R15X226KV4E
6.3V, 10%, X5R, ROHS INC
JMK212BJ226KG-T
VLCF-4028T-1R2N2R7-2
1
ea.
TDK
L1 for ISL8002A, COIL-PWR
INDUCTOR, WW,
ISL80019A,
SMD, 4mm, 1.2µH,
2MHz
30%, 2.7A, ROHS
VLCF4028T-1R2N2R7-2
74437324022
1
ea.
Wurth Electronics
L1 for ISL8002, COIL-PWR
ISL80019, 1MHz INDUCTOR, SMD,
4.45x4.6, 2.2µH,
20%, 3.25A, ROHS
74437324022
ISL8002IRZ
1
ea.
U1
IC-2A BUCK
REGULATOR, 8P,
µTDFN, 2X2, ROHS
INTERSIL
ISL8002IRZ
H2510-01003-1/16W1-T
2
ea.
R2, R14
RES, SMD, 0402,
100kΩ, 1/16W, 1%
PANASONIC
ERJ2RKF1003
H2510-02003-1/16W1-T
1
ea.
R1
RES,SMD, 0402,
200kΩ, 1/16W, 1%
VISHAY/DALE,
VENKEL
CRCW0402200KFKED
CR0402-16W-2003FT
PANASONIC
ROHM
ERJ-3EKF1003V
MCR03EZPFX1003
H2510-DNP
0
ea.
R12
RES, SMD, 0402, DNP
H2511-01003-1/10W1-T
2
ea.
R6, R7
RES, SMD, 0603,
100kΩ, 1/10W, 1%
H2511-DNP
0
ea.
R8, R9
RES, SMD, 060 3,
DNP-PLACE HOLDER
MURATA
PANASONIC
MANUFACTURER
PART
GRM36COG220J050AQ
ECU-E1H220JCQ
ECU-E1H221JCQ
C1005C0G1H221J
VLCF4028T-1R2N2R7-2
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 Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
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Application Note 1817
Typical Performance Curves
LX 5V/DIV
VIN 5V/DIV
VOUT 1V/DIV
VOUT 2V/DIV
VEN 2V/DIV
IL 1A/DIV
PG 5V/DIV
PG 5V/DIV
500µs/DIV
1ms/DIV
FIGURE 6. ISL8002A START-UP AT 2A LOAD fSW = 2MHz, VIN = 5V,
MODE = PWM, TA = +25°C
FIGURE 7. ISL8002D START-UP VIN AT 2A LOAD fSW = 2MHz,
VIN = 5V, MODE = PWM, TA = +25°C
LX 5V/DIV
VOUT 0.5V/DIV
IL 1A/DIV
IL 2A/DIV
VOUT 1V/DIV
PG 5V/DIV
PG 5V/DIV
5µs/DIV
500µs/DIV
FIGURE 8. ISL8002A OUTPUT SHORT-CIRCUIT fSW = 2MHz,
VIN = 5V, MODE = PFM, TA = +25°C
FIGURE 9. ISL8002A OVERCURRENT PROTECTION fSW = 2MHz,
VIN = 5V, MODE = PWM, TA = +25°C
PHASE 5V/DIV
PHASE 5V/DIV
VOUT 0.5V/DIV
VOUT 2V/DIV
IL 2A/DIV
IL 2A/DIV
PG 5V/DIV
PG 5V/DIV
200µs/DIV
FIGURE 10. ISL8002D OUTPUT SHORT-CIRCUIT fSW = 2MHz,
VIN = 5V, MODE = PFM, TA = +25°C
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500µs/DIV
FIGURE 11. ISL8002D OVERCURRENT PROTECTION fSW = 2MHz,
VIN = 5V, MODE = PWM, TA = +25°C
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