Intersil ISL85001EVAL1Z Installation and operating instructions

1
®ISL85001EVAL1Z: 1A
Regulator Standard Buck PWM
Description
The ISL85001EVAL1Z REV A kit is intended for use by
individuals with requirements for Point-of-Load applications
sourcing from 4.5V to 25V. The ISL85001EVAL1Z evaluation
board is used to demonstrate the performance of the
ISL85001 standard buck regulator.
The ISL85001 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 19V with
Continuous Output Current up to 1A
• Voltage Mode Control with Voltage Feed-Forward
• Fixed 500kHz Switching Frequency
• Externally Adjustable Soft-Start Time
• Output Undervoltage Protection
• Enable Inputs
• 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
• LCD Panel
• Set-top Box
What’s Inside
The Evaluation Board Kit contains the following materials:
• The ISL85001 EVAL REV A board
• The ISL85001 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 ISL85001EVAL 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
December 1, 2008 AN1443.0Application 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. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

2AN1443.0
December 1, 2008
ISL85001EVAL1Z Schematic
POPULATE R30 IF VIN <6V ONLY
OFF
1
C8
1
TP4
2
47UF
470PF
10K
R2
220UF
1UF
0.1UF
FB
COMP
ISL8500IRZ
VIN
GND
10UF
47PF
OPEN
10K
PG
2.43K
VOUT
EN
2N7002
ON EN
100K
VIN
PG
VDD
VDD
PHASE
OPEN
OPEN
3.16K
0.1UF
301
2200PF
BOOT
30K
1
C10
12
L1
TP3
C9
TP1
1
TP2
1
D3
21
D1
2
1
C11
SW1 2
3
1
Q4
3
1
2
R4
C2
C20
12
R30
R12
TP16
1
TP13
1
C21
1
C13
12
C12
12
R20
R21
C3
12
C1
2
R3
R1
C4
12
SP1
2
3
4
1
SP2
2
3
4
1
U1
1
10
11
12
2
3
4
5
67
8
9
13
12
FB
COMP
SS
PG
EN
GND
VIN
VIN
PHASE
PHASE
BOOT
VDD
EP
Application Note 1443

3AN1443.0
December 1, 2008
ISL85001EVAL1Z Bill of Materials
PART NUMBER QTY UNITS REFERENCE DESIGNATOR DESCRIPTION MFR MANUFACTURER PART
ISL85001EVAL1ZREVAPCB 1 ea See Label-Rename
Board PWB-PCB, ISL85001EVAL1Z, REVA,
ROHS
TITAN ISL85001EVAL1ZREVAPCB
C1608X7R1H104K-T 1 ea C9 CAPACITOR, SMD, 0603,
0.10µF, 50V, 10%, X7R TDK C1608X7R1H104K
H1044-00104-16V10-T 1 ea C4 CAP, SMD, 0402, 0.1µF, 16V,
10%, X7R, ROHS MURATA GRM36X7R104K016AD
H1044-00222-50V10-T 1 ea C1 CAP, SMD, 0402, 2200pF,
50V, 10%, X7R, ROHS PANASONIC ECJ-0EB1H222K
H1044-00470-50V5-T 1 ea C2 CAP, SMD, 0402, 47pF, 50V,
5%, NPO, ROHS MURATA GRM36COG470J050AQ
H1044-00471-50V10-T 1 ea C3 CAP, SMD, 0402, 470pF, 50V,
10%, X7R, ROHS PANASONIC ECJ-0EB1H471K
H1045-00105-6R3V10-T 1 ea C8 CAP, SMD, 0603, 1µF, 6.3V,
10%, X5R, ROHS PANASONIC ECJ1VB0J105K
H1065-00106-25V10-T 1 ea C10 CAP, SMD,1206,10µF, 25V,
10%, X5R, ROHS VENKEL C1206X5R250-106KNE
H1082-00476-16V20-T 1 ea C12 CAP, SMD, 1210, 47µF, 16V,
20%, x5R, ROHS TDK C3225X5R1C476M
IHLP2525CZER220M11 1 ea L1 COIL-PWR INDUCTOR,
SMD, 6.9x6.5, 22µH, 20%,
7A, ROHS
VISHAY IHLP2525CZER220M11
131-4353-00 2 ea SP1, SP2 CONN-SCOPEPROBETEST
PT, COMPACT, PCB MNT,
ROHS
TEKTRONIX 131-4353-00
1514-2 4 ea TP1 to TP4 CONN-TURRET, TERMINAL
POST, TH, ROHS KEYSTONE 1514-2
5002 2 ea TP13, TP16 CONN-MINI TEST POINT,
VERTICAL, WHITE, ROHS KEYSTONE 5002
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/VISHA
YLTST-C170CKT
ISL85001IRZ 1 ea U1 IC-2A BUCK REGULATOR,
12P, DFN, 4x3, ROHS INTERSIL ISL85001IRZ
2N7002-7-F-T 1 ea Q4 TRANSISTOR, N-CHANNEL,
3LD, SOT-23, 60V, 115mA,
ROHS
DIODES,INC. 2N7002-7-F
H2510-01002-1/16W1-T 1 ea R2 RES,SMD, 0402, 10k,1/16W,
1%, TF, ROHS PANASONIC ERJ-2RKF1002
H2510-01003-1/16W1-T 1 ea R12 RES, SMD, 0402, 100k,
1/16W, 1%, TF, ROHS PANASONIC ERJ2RKF1003
H2510-03002-1/16W1-T 1 ea R1 RES,SMD, 0402, 30k,1/16W,
1%, TF, ROHS YAGEO RC0402FR-0730KL
H2510-03010-1/16W1-T 1 ea R3 RES, SMD, 0402, 301Ω,
1/16W, 1%, TF, ROHS PANASONIC ERJ-2RKF3010X
Application Note 1443

4AN1443.0
December 1, 2008
H2510-03161-1/16W1-T 1 ea R4 RES, SMD, 0402, 3.16k,
1/16W, 1%, TF, ROHS VENKEL CR0402-16W-3161FT
H2511-01002-1/10W1-T 1 ea R21 RES, SMD, 0603,10k, 1/10W,
1%, TF, ROHS KOA RK73H1JT1002F
H2511-02431-1/10W1-T 1 ea R20 RES, SMD, 0603, 2.43k,
1/10W, 1%, TF, ROHS VENKEL CR0603-10W-2431FT
H2511-DNP 0 ea R30 RES, SMD, 0603, DNP-
PLACE HOLDER, ROHS
GT11MSCBE-T 1 ea SW1 SWITCH-TOGGLE, SMD,
ULTRAMINI, 1P, SPST MINI C&K COMPONENTS GT11MSCKE
4-40x1/2-SCREW 4 ea Four corners SCREW, 4-40x1/2in, PAN,
NYLON, PHILLIPS, ROHS
4-40x3/4-STANDOFF 4 ea Four corners STANDOFF, 4-40x3/4in, F/F,
HEX, NYLON KEYSTONE 1902D
5x8-STATIC-BAG 1 ea Place assy in bag. BAG, STATIC, 5x8, ZIP LOC INTERSIL 212403-013
DNP 0 ea C11, C13, C20, C21 DO NOT POPULATE OR
PURCHASE
LABEL-RENAME BOARD 1 ea RENAME PCB TO:
ISL85001EVAL1Z LABEL, TO RENAME BRD
LABEL-SERIAL NUMBER 1 ea LABEL, FOR SERIAL
NUMBER AND BOM REV #
ISL85001EVAL1Z Bill of Materials(Continued)
PART NUMBER QTY UNITS REFERENCE DESIGNATOR DESCRIPTION MFR MANUFACTURER PART
Application Note 1443

5AN1443.0
December 1, 2008
ISL85001EVAL1Z Board Layout
FIGURE 2. TOP COMPONENTS
FIGURE 3. TOP LAYER ETCH
ISL85001EVAL1Z
Application Note 1443

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
AN1443.0
December 1, 2008
FIGURE 4. BOTTOM LAYER COMPONENTS (MIRRORED)
FIGURE 5. BOTTOM LAYER ETCH (MIRRORED)
ISL85001EVAL1Z Board Layout (Continued)
Application Note 1443