Intersil ISL8500EVAL1Z Installation and operating instructions

1
®ISL8500EVAL1Z 2A Regulator Standard
Buck PWM
Description
The ISL8500EVAL1Z REV A kit is intended for use by
individuals with requirements for Point-of-Load applications
sourcing from 4.5V to 25V. The ISL8500EVAL1Z evaluation
board is used to demonstrate the performance of the
ISL8500 standard buck regulator.
The ISL8500 is offered in a 4mmx3mm 12 Ld DFN package
with 1mm maximum height. The complete converter
occupies less than 0.425in2area.
Features
• Standard Buck Controller with Integrated Switching Power
MOSFET
• Integrated Boot Diode
• Input Voltage Range
- Fixed 5V ±10%
- Variable 5.5V to 25V
• PWM Output Voltage Adjustable from 0.6V to 20V with
Continuous Output Current up to 2A
• Voltage Mode Control with Voltage Feed Forward
• Fixed 500kHz Switching Frequency
• Externally Adjustable Soft-Start Time
• Output Undervoltage Protection
• PGOOD Output
• Overcurrent Protection
• Thermal Overload Protection
• Internal 5V LDO regulator
Applications
• General Purpose
• WLAN Cards-PCMCIA, Cardbus32, MiniPCI Cards-
Compact Flash Cards
• Hand-Held Instruments
What’s Inside
The Evaluation Board Kit contains the following materials:
• The ISL8500 EVAL REV D board
• The ISL8500 datasheet
• This EVAL KIT document
Recommended Equipment
The following materials are recommended to perform
testing:
• 0V to 25V power supply with at least 5A source current
capability, battery, notebook AC adapter
• One electronic load capable of sinking current up to 5A
• Digital Multimeters (DMMs)
• 100MHz quad-trace oscilloscope
• Signal generator
Quick Setup Guide
1. Ensurethatthecircuitiscorrectlyconnectedtothesupply
and loads prior to applying any power.
2. Connect the bias supply to VIN, the plus terminal to TP1
(VIN) and the negative return to TP2 (GND).
3. Verify that SW1 is on ENABLE.
4. Turn on the power supply.
5. Verify the PG is on and the output voltage is 2.5V for
VOUT(TP3).
Evaluating the Other Output Voltage
The ISL8500EVAL kit outputs are preset to 2.5V; however, it
can be programmed using resistor dividers using Equation 1:
The output voltage programming resistor R2will depend on
on the feedback resistor R1, as referred to in Figure 1. The
value of R1is typically between 1kΩand 10kΩ. If the output
voltage desired is 0.6V, then R2is left opened.
TABLE 1. SWITCH 1 SETTINGS
SW1 ENABLE OPERATING MODE
1 SW1 Enable or disable the buck controller
R2R10.6V⋅
VOUT 0.6V–
----------------------------------
=(EQ. 1)
R1
R2
0.6V
EA
REFERENCE
+
-
VOUT
FIGURE 1. EXTERNAL RESISTOR DIVIDER
November 21, 2007 AN1372.0Application Note
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

2AN1372.0
November 21, 2007
Schematic
POPULATE R30 IF VIN <6V ONLY
OFF
R1
2
C4
1 2
0.1UF
TP16
8
1UF
10K
PG
2
C8
13
9
7 6
5
4
2
12
11
1
U1
4
3
2
1
4
3
2
SP1
TP13
1
R12
R30
2
1
2
1
3
Q4
1
3
2
SW1
2
1
2
D3
1
TP2
1
TP1
1
TP3
L1
2
1
TP4
2.43K
VOUT
EN
2N7002
ON EN
100K
BOOT
VIN
GND
VIN
301
PG
COMP
VDD
VDD
C2
2 1
C1
1
D1
2
1
1
2
C12
1
PHASE
10
FB
C9
10UH
220UF
C20
OPEN
1
C13
1
C10 C11
100UF
OPEN
2
1
C21
R21
R20
SP2
10UF
C3
OPEN
1
0.1UF
470PF
ISL8500IRZ
1
R2
10K
R3
2200PF
3
3.16K
R4
10PF
51.1K
FB
COMP
SS
PG
EN
GND
VIN
VIN
PHASE
PHASE
BOOT
VDD
EP
Application Note 1326

3AN1372.0
November 21, 2007
ISL8500EVAL1Z Bill of Materials
PART NUMBER QTY UNITS REFERENCE DESIGNATOR DESCRIPTION MANUFACTURER MANUFACTURER PART
ISL8500EVAL1ZREVAPCB 1 ea PWB-PCB,ISL8500EVAL1Z,
REVA, ROHS TITAN ISL8500EVAL1ZREVAPCB
H1044-00222-50V10-T 1 ea C1 CAP, SMD, 0402, 2200pF,
50V, 10%, X7R, ROHS PANASONIC ECJ-0EB1H222K
H1065-00106-25V10-T 1 ea C10 CAP, SMD, 1206, 10µF, 25V,
10%, X5R, ROHS VENKEL C1206X5R250-106KNE
DNP 0 ea C11, C13,C20,
C21 DO NOT POPULATE OR PURCHASE
H1082-00107-6R3V20-T 1 ea C12 CAP, SMD, 1210, 100µF,
6.3V, 20%, X5R, ROHS TDK C3225X5R0J107M
PANASONIC ECJ-4YB0J107M
AVX 12106D107MAT
H1044-00100-50V5-T 1 ea C2 CAP, SMD ,0402, 10pF, 50V,
5%, NPO ,ROHS VENKEL C0402COG500-100JNE
H1044-00471-50V10-T 1 ea C3 CAP, SMD, 0402, 470pF,
50V, 10%, X7R, ROHS PANASONIC ECJ-0EB1H471K
VENKEL C0402X74500-471KNE
H1044-00104-16V10-T 1 ea C4 CAP, SMD, 0402, 0.1µF, 16V,
10%, X7R, ROHS MURATA GRM36X7R104K016AD
VENKEL C0402X7R160-104KNE
H1045-00105-6R3V10-T 1 ea C8 CAP, SMD, 0603, 1µF, 6.3V,
10%, X5R, ROHS PANASONIC ECJ1VB0J105K
C1608X7R1H104K-T 1 ea C9 CAPACITOR, SMD, 0603,
0.10µF, 50V, 10%, X7R TDK C1608X7R1H104K
B340LB-13-F-T 1 ea D1 DIODE-SCHOTTKY SMD,
SMB, 2P, 40V, 3A LOW VF,
ROHS
DIODES INC. B340LB-13-F
LTST-C170CKT 1 ea D3 LED-GaAs RED, SMD,
2x1.25mm, 100mW, 40mA,
10mcd, ROHS
LITEON/VISHAY LTST-C170CKT
ROHM SML-210LTT86
STANLEY ELECTRIC BR112H-TR
IHLP2525CZRZ100M01 1 ea L1 COIL-PWR INDUCTOR,
SMD, 6.9x6.5, 10µH, 20%,
3A, ROHS
VISHAY IHLP2525CZRZ100M01
2N7002-7-F-T 1 ea Q4 TRANSISTOR,N-CHANNEL,
3LD, SOT-23, 60V, 115mA,
ROHS
DIODES, INC. 2N7002-7-F
ON
SEMICONDUCTOR 2N7002LT1G
H2510-05112-1/16W1-T 1 ea R1 RES, SMD, 0402, 51.1k,
1/16W, 1%, TF, ROHS PANASONIC ERJ-2RKF5112X
VENKEL CR0402-16W-5112FT
H2510-01003-1/16W1-T 1 ea R12 RES, SMD, 0402, 100k,
1/16W, 1%, TF,ROHS PANASONIC ERJ2RKF1003
H2510-01002-1/16W1-T 1 ea R2 RES, SMD, 0402, 10k,
1/16W, 1%, TF,ROHS PANASONIC ERJ-2RKF1002
VENKEL CR0402-16W-1002FT
H2511-02431-1/10W1-T 1 ea R20 RES, SMD, 0603, 2.43k,
1/10W, 1%, TF, ROHS VENKEL CR0603-10W-2431FT
YAGEO RC0603FR-072K43L
H2511-01002-1/10W1-T 1 ea R21 RES, SMD, 0603, 10k,
1/10W, 1%, TF,ROHS KOA RK73H1JT1002F
VENKEL CR0603-10W-1002FT
Application Note 1326

4AN1372.0
November 21, 2007
H2510-03010-1/16W1-T 1 ea R3 RES, SMD, 0402, 301Ω,
1/16W, 1%, TF, ROHS PANASONIC ERJ-2RKF3010X
VENKEL CR0402-16W-3010-FT
H2511-DNP 0 ea R30 RES, SMD, 0603, DNP-
PLACE HOLDER, ROHS
H2510-03161-1/16W1-T 1 ea R4 RES,SMD, 0402, 3.16k,
1/16W, 1%, TF, ROHS VENKEL CR0402-16W-3161FT
PANASONIC ERJ-2RKF3161X
VISHAY/DALE CRCW04023K16FKED
131-4353-00 2 ea SP1,SP2 CONN-SCOPE PROBE
TEST PT, COMPACT, PCB
MNT, ROHS
TEKTRONIX 131-4353-00
GT11MSCBE-T 1 ea SW1 SWITCH-TOGGLE, SMD,
ULTRAMINI, 1P, SPST MINI C&K COMPONENTS GT11MSCKE
5002 2 ea TP13,TP16 CONN-MINI TEST POINT,
VERTICAL, WHITE, ROHS KEYSTONE 5002
1514-2 4 ea TP1-TP4 CONN-TURRET, TERMINAL
POST, TH, ROHS KEYSTONE 1514-2
ISL8500IRZ 1 ea U1 IC-2A BUCK REGULATOR,
12P, DFN, 4x3, ROHS INTERSIL ISL8500IRZ
ISL8500EVAL1Z Bill of Materials(Continued)
PART NUMBER QTY UNITS REFERENCE DESIGNATOR DESCRIPTION MANUFACTURER MANUFACTURER PART
Application Note 1326

5AN1372.0
November 21, 2007
ISL8500EVAL1Z Board Layout
FIGURE 2. TOP COMPONENTS
FIGURE 3. TOP LAYER ETCH
Application Note 1326

6
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
AN1372.0
November 21, 2007
FIGURE 4. BOTTOM LAYER COMPONENTS (MIRRORED)
FIGURE 5. BOTTOM LAYER ETCH (MIRRORED)
ISL8500EVAL1Z Board Layout (Continued)
Application Note 1326