an1241

ISL8013 Monolithic DC/DC Evaluation Board
Setup Procedure
®
Application Note
June 1, 2006
AN1241.1
Author: Steve Laur
This document describes the setup procedure for the
ISL8013EVAL1 Rev A board.
Features
Description
• Components on one side of PCB
The General Purpose market requires maximum flexibility in
its power management solutions due to the large variety of
applications produced each year. The ISL8013 services this
need by offering a multitude of functionality, combined with
features that allow it to work in many different application
spaces.
• Max height 1.2mm HTSSOP14
• Less than 0.36in2 footprint for the complete 3A converter
From a functional standpoint, the ISL8013 is an ideal
controller for designers that want a “plug and play” solution.
It delivers a regulated output voltage from 0.8V to 5.5V at a
maximum current of 3A, with 11 or fewer total components.
Its 14 Ld HTSSOP package, combined with integrated
MOSFET switches and compensation, yield a solution size
below 0.36in2. This small form factor makes the ISL8013 a
desirable solution for any application where board space is a
premium (PDAs, cell phones, etc.).
Additional features include a power good (PG) indicator for
output voltage monitoring, and a clock frequency
synchronizing input (SYNC). The SYNC input allows the
regulator to switch anywhere between the nominal 1.4MHz
frequency and 12MHz. Synchronizing multiple switching
devices on the same bus eliminates beat-frequency
oscillations that can be detrimental to noise-sensitive
applications.
The ISL8013 supports power up into applications with prebiased loads by allowing Pulse Frequency Modulation (PFM)
during the soft-start period.
Overall, the ISL8013 delivers a robust, highly integrated
DC/DC buck converter for a variety of General Purpose
applications. For a more detailed description of the ISL8013,
refer to the data sheet [1].
The Intersil General Purpose family of monolithic switching
power supplies continues to expand with new selections to
better fit our customer’s needs.
References
• Power-Good (PG) output
• Internally-compensated voltage mode controller
• Up to 95% efficiency
• <1µA shut-down current
• Hiccup mode overcurrent and over-temperature protection
• External synchronization up to 12MHz
• Pb-free plus anneal available (RoHS compliant)
Ordering Information
PART
NUMBER
(Note)
TAPE &
REEL
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL8013IVEZ
-
14 Ld HTSSOP
MDP0048
ISL8013IVEZ-T7
7”
14 Ld HTSSOP
MDP0048
ISL8013IVEZ-T13
13”
14 Ld HTSSOP
MDP0048
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
Pinout
ISL8013IVEZ
(14 LD HTSSOP)
TOP VIEW
1
PG
LX 14
2
VIN
PGND 13
3
VIN
LX 12
4
VIN
PGND 11
5
VDD
SGND 10
6
SYNC
FB
9
7
EN
VO
8
[1] Refer to our website for updated information and the
ISL8013 data sheet: www.intersil.com.
1
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. 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Application Note 1241
What’s Inside
TABLE 1. DETAILED DESCRIPTION OF SWITCH SETTINGS
The Evaluation Board Kit contains the following materials:
SWITCH
POSITION
FUNCTION
S1
ON
ENABLE ISL8013
OFF (default)
DISABLE ISL8013
• The ISL8013EVAL1 Rev A Evaluation Board
• The ISL8013 data sheet
• The ISL8013 Evaluation Board Setup Procedure (this
document)
TABLE 2. DETAILED DESCRIPTION OF TEST POINTS
REF DES
TYPE
FUNCTION
P1
Test Point
SYNC Input:
HIGH = Force PWM
LOW = Auto PFM/PWM
Switching = Clock Sync
P2
Test Point
GND
P3
Test Point
PGOOD Output
P6
Test Point
External Enable NOT. S1 is required
to be in the ON position.
J1
Oscilloscope
Kelvin LX Measurement
Quick Setup Guide
J2
Oscilloscope
Kelvin VOUT Measurement
Step 1:
P4
Binding Post
GND
P5
Binding Post
VIN
P7
Binding Post
VOUT
P8
Binding Post
GND
What is Needed
The following materials will be needed to perform testing:
• 1 electronic load [see note]
• 1 power supply: 0-6V @ 5A (see note)
• 2 precision digital multimeters
• Oscilloscope
NOTE: amperage rating of power supplies and loads are determined
by maximum expected loading plus a percentage margin of error
Step 2:
Set the +VIN power supply to +3.3V and place in
the “STANDBY” or “OFF” position. Set the supply
current limit to 5A. Connect the positive terminal
(+) of the supply to the VIN terminal P4 and the
negative terminal (-) of the supply to GND P5.
Connect the positive terminal (+) of a DMM to the
VIN terminal P4 and the negative terminal (-) to
the GND terminal P5.
Step 3:
Connect the positive terminal (+) of the electronic
load to the VOUT terminal P7. Connect the
negative terminal (-) of the electronic load to the
GND terminal P8. Make sure the electronic load is
set to the 0A condition.
Step 4:
Connect the positive terminal (+) of a DMM to the
VOUT terminal P7 and the negative terminal (-) to
the GND terminal P8.
Step 5:
Check to ensure all jumpers and switches are in
their default positions prior to application of power
(refer to Table 1).
Step 6:
Set all power supplies to the “ON” position. LED
D1 should be off. Check all DMM displays for
correct voltage levels. Adjust if necessary.
Step 7:
Turn the ENABLE switch S1 to the “ON” position.
LED D1 should glow red. The VOUT DMM should
read 1.80V (±5%).
EVAL Board Information
At this point the board has been properly powered up.
Normal testing can begin.
NOTE: If you need technical assistance, or other assistance, with
the ISL8013 Evaluation Board, call 1-888-INTERSIL (468-3774).
2
FIGURE 1. ISL8013EVAL1 REV A EVALUATION BOARD
AN1241.1
June 1, 2006
Application Note 1241
Eval Board Schematic
1
P5
SYNC 10
EN
6
7
15
(See Note)
5
4
3
5
4
3
10
A
A
SYNC
1K
R3
P1
P2
VIN
R7
A
750
EN
2
ON/EX
OFF
3
1
31
R8
D1
EXT: EN
2N7002
2N7002
Q2
2
P6
Q1
2
1
3
S1 1
1K
10K
R4
2
R5
VIN
PG
10UF
A
8
A
P3
P8
9
ISL8013
A
10UF
C6
11
C5
12
470PF
5
P7
1.0UH
13
124K
C4
4
R6
L1
14
LX
PGND
LX
PGND
SGND
FB
VO
2
1K
10UF
10UF
C2
C1
3
A
U1
PG
VIN
VIN
VIN
VDD
SYNC
EN
EP
1
J2
100K
P4
2
2
R1
VIN
1
A
R2
PG
1UF
C3
J1
A
A
NOTE: It may be necessary to place a high value electrolytic capacitor between VIN terminals P4 and P5 to eliminate power supply lead impedance.
3
AN1241.1
June 1, 2006
Application Note 1241
TABLE 3. BILL OF MATERIALS
ITEM
QTY
REFERENCE
VALUE
TYPE
1
1
U1
2
2
J1, J2
Tekronix Scope Jack
3
2
Q1, Q2
N-Channel MOSFET: 2N7002
4
4
C1, C2, C5, C6
10µF
Generic ceramic capacitor
1206
6.3V
5
1
C3
1µF
Generic ceramic capacitor
0603
6.3V
6
1
C4
470pF
Generic ceramic capacitor
0603
6.3V
7
1
L1
1µH
8
1
S1
9
1
R1
124kΩ
Generic thick film chip resistor
0603
10
1
R2
100kΩ
Generic thick film chip resistor
0603
11
3
R3, R7, R8
1kΩ
Generic thick film chip resistor
0603
12
1
R4
10kΩ
Generic thick film chip resistor
0603
13
1
R5
750Ω
Generic thick film chip resistor
0603
14
1
R6
10Ω
Generic thick film chip resistor
0603
15
1
D1
Liteon: LTST-C170CKT
0603
16
4
P1, P2, P3, P6
Test Points
17
4
P4, P5, P7, P8
Binding Posts
Intersil ISL8013
FOOTPRINT
VOLTAGE
HTSSOP14
SOT-23
Pulse: P1166.162
SPDT Switch: GT11MSCKE
Eval Board Layout
FIGURE 2. EVAL BOARD TOP LAYER ROUTING (ETCH)
FIGURE 3. EVAL BOARD BOTTOM LAYER ROUTING (ETCH)
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. 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 data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
4
AN1241.1
June 1, 2006