an1271

ISL6236 Evaluation Kit –
System Regulation Application
®
Application Note
This application note describes the ISL6236 evaluation
board intended for applications in notebook computers and
other battery-powered devices.
Description
As notebook computer and battery-powered equipment
complexity increases, higher levels of power management
integration are required to meet market demands. To
respond to the dynamic needs of its customers, Intersil
introduces the quad outputs, multi-function power supply
controller ISL6236. Its two fully programmable switch-mode
power supplies (SPMS), one programmable and one fixed
LDO outputs provide a robust power management solution
for an extremely wide range of applications. In addition, it
includes an optional 14V charge pump. For more information
on the detailed workings of the ISL6236, please consult the
ISL6236 Data Sheet on the Intersil Company website
(http://www.intersil.com)
December 22, 2008
AN1271.1
Quick Setup Guide
1. Set the +25V power supply to +7V and place in the
“STANDBY” or “OFF” position. Connect the positive
terminal (+) of the supply to the +VIN terminal P1 and the
negative terminal (-) of the supply to GND P2.
2. Connect the positive terminal (+) of the electronic load to
the VOUT1 terminal P5. Connect the negative terminal (-)
of the electronic load to the GND terminal P6. Make sure
the electronic load is set to the 0A condition.
3. Check to ensure all switches are in their default positions
prior to application of power (refer to “Detailed
Description of Switch Settings” on page 2).
4. Set all power supplies to the “ON” position. Check both
5V and 25V power supply outputs with a DMM to ensure
correct voltage levels. Adjust if necessary.
5. Measure the default output voltages using DMM across
the test points.
•VOUT1: P7(+) to P8(-), it should read 5.0V
•VOUT2: P5(+) to P6(-), It should read 3.3V
What’s Inside
The Evaluation Board Kit contains the following materials:
•LDO: P3(+) to P4(-), It should read 5.0V
•VREF3: P14(+) to P8(-), It should read 3.3V
• ISL6236 EVAL1 REV A Board
•CHARGE PUMP: P28(+) to P8(-), it should read 14.0V.
• ISL6236 Data Sheet
• ISL6236 Application Note (this document)
At this point, the board has been properly powered up.
Normal testing can begin.
What’s Needed
Summary
The following materials will be needed to perform testing:
The ISL6236EVAL1 is an adaptable evaluation tool which
showcases the performance of the ISL6236 chipset
designed to meet the power management requirements of
personal notebook computers or portable devices.
• +25V, 20A Power Supply
• +5.0V, 750mA Power Supply
• Electronic Load up to 15A
The following pages provide jumper settings, pinout,
schematic of the board, bill of materials and layout drawings
to support implementation of this solution.
• Precision digital multimeter
• 4-Channel oscilloscope
Note: amperage rating of power supplies are determined by
maximum expected loading plus a percentage margin of
error.
The Intersil’s total power management portfolio continues to
expand with new selections to better fit our customer’s
needs. Refer to our web site for updated information:
http://www.intersil.com
For technical assistance or other assistance please call
1-888-INTERSIL (468-3774).
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. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Application Note 1271
How to Change Output Settings
Detailed Description of Switch Settings
Use following tables to change the adjustable outputs.
TABLE 4.
TABLE 1.
VOUT1
5V
1.5V
0.7V to 5.5V
FUNCTION
FB1 = GND, Default
FB1 = VCC
VFB*(1 + R11/R12) where VFB = 0.7V
SW1
EN2
1
GND
VOUT2 shut down
2
VCC*
VOUT2 Active
3
REF
VOUT2 sequence to Vout1
TABLE 5.
TABLE 2.
VOUT2
FUNCTION
SW2
SKIP
FUNCTION
1
GND
Normal operational mode, automatic
switch over to Pulse Skipping at light load
FUNCTION
3.3V
REFIN2 = VCC, Default
1.05V
REFIN2 = VREF3
2
VCC*
Low Noise, fixed-frequency PWM
VREFIN2, where VREFIN2 = 0.5 to 2.5V
3
REF
Normal Operation Mode with Ultrasonic
Pulse-skipping, 20kHz min.
0.5V to 2.5V
TABLE 3.
LDO
5V
3.3V
0.7V to 4.5V
TABLE 6.
FUNCTION
LDOREFIN = GND, Default
LDOREFIN = VCC
2xVLDOREFIN, where VLDOREFIN = 0.35V to
2.25V
SW3
EN_LDO
FUNCTION
1
GND
LDO shut down
2
VCC*
LDO Active
3
N/C
No Connect
TABLE 7.
SW4
BYP
FUNCTION
1
GND
Set BYP to 0V, No LDO switchover
2
VOUT1*
Bypasses LDO Voltage with VOUT1
3
VOUT2
Bypasses LDO Voltage with VOUT2
TABLE 8.
SW5
EN1
FUNCTION
1
GND
Vout1 Shutdown
2
VCC*
Vout1 Active
3
REF
Vout1 sequence to Vout2
NOTE: * Indicates default settings.
For all switches, only toggle one position at a time and use
break-before-make sequencing to avoid shorting VCC to
GND.
2
AN1271.1
December 22, 2008
Application Note 1271
Pinout
REFIN2
ILIM2
OUT2
SKIP#
POK2
EN2
UGATE2
PHASE2
ISL6236
(32 LD 5X5 QFN)
TOP VIEW
32
31
30
29
28
27
26
25
VCC
3
22
PGND
EN_LDO
4
21
GND
VREF3
5
20
SECFB
VIN
6
19
PVCC
LDO
7
18
LGATE1
LDOREFIN
8
17
BOOT1
9
10
11
12
13
14
15
16
PHASE1
LGATE2
UGATE1
23
EN1
2
POK1
TON
ILIM1
BOOT2
FB1
24
OUT1
1
BYP
REF
ISL6236 Evaluation Board Top and Bottom View
(P4)
(P4)
(P5) (P6) (P14)
VOUT1 GND VREF3
(P3)
Charge Pump GND LDO
ISL6236 Controller
(P1)
VIN
(P2)
GND
(P7)
(P8)
VOUT2 GND
(P29)
PVCC
FIGURE 1. ISL6236EVAL1 REV B EVALUATION BOARD TOP AND BOTTOM VIEW
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December 22, 2008
ISL6236EVAL1-Kit Schematic
4
Application Note 1271
AN1271.1
December 22, 2008
FIGURE 2. ISL6236EVAL1 REV A KIT SCHEMATIC
Application Note 1271
Components List:
REF DES
PART NUMBER
QTY
MANUFACTURER
DESCRIPTION
C1, C7, C8
08053D105KAT2A
3
AVX
1µF, 25V, X7R, 0805
C11
H1065-00475-10V10
1
GENERIC
4.7µF, 10V, X5R, 1206
C14, C16
TMK432BJ106KM
2
TAIYO-YUDEN
10µF, 25V, X5R, 1210
C2, C4, C5, C6, C10, C12,
C13, C23, C24, C26
H1046-00104-50V10
GENERIC
0.1µF, 50V, X7R, 0805
C27, C28
OPEN
0
-
-
C29, C30
6TPD330M
2
POSCAP SANYO
330µF, 6.3V, POS CAP 9mΩ, D size
C3, C9, C15, C17, C18, C19 OPEN
0
-
-
C31, C32
OPEN
0
POSCAP
-
D1, D4-D6
OPEN
0
DIODES-INC
-
D2, D3
OPEN
0
ON-SEMI
-
D7, D8
BAT54sST
2
DIODES
0.2A, 30V, Schottky SOT23
D9
BAT54WT1-T
1
ON-SEMI
2A, 30V, Schottky SOT23
L1, L2
SD1003
2
FALCO
4.7µH, 7mΩ, 12.5x12.5mm Shielded
P1, P2, P5 to P8
1514-2
6
KEYSTONE
Test Point Turret 0.150 Pad 0.100 Thole
P19-P23
131-4353-00
5
TEKTRONIX
Scope Probe Test Point PCB Mount
P3, P11, P12, P14 to P18,
P24, P26 to P29
5000
KEYSTONE
Miniature Red Test Point 0.100 Pad 0.040 Thole
P4, P30
5001
2
KEYSTONE
Miniature Black Test Point 0.100 Pad 0.040 Thole
Q1
IRF7821
1
IR
30V, 13.6A HEXFET Power MOSFET
Q2
IRF7832
1
IR
30V, 20A HEXFET Power MOSFET
Q3
IRF7807V
1
IR
30V, 8.3A N-Channel Power MOSFET
Q4
IRF7811AV
1
IR
30V, 10.8A N-Channel Power MOSFET
R1, R8
H2512-00010-1/8W
2
GENERIC
1Ω, 1%, 0805
R15
H2512-01503-1/10W1
1
GENERIC
150kΩ, 1%, 0805
R2, R7, R9, R11, R13, R14,
R18, R19, R20, R22, R23,
R27, R34
OPEN
-
-
R25, R26
OPEN
-
-
R3, R10, R12, R17,
R21, R24, R30, R31
H2512-00R00-1/10W
GENERIC
0Ω, 1%, 0805
R32
H2512-03922-1/10W1
1
GENERIC
39.2kΩ, 1%, 0805
R4, R5, R16, R33
H2512-02003-1/10W1
4
GENERIC
200kΩ, 1%, 0805
R6
H2512-025R5-1/8W1
1
GENERIC
25.5Ω, 1%, 0805
SW1 to SW5
78B03S
5
GRAYHILL
Dip Switch SPST (Raised Slide)
U1
ISL6236IRZA
1
INTERSIL
High-Efficiency, Quad Output Controller
10
13
0
5
0
8
AN1271.1
December 22, 2008
Application Note 1271
Layout
FIGURE 3. TOP COMPONENTS
FIGURE 4. TOP ETCH
FIGURE 5. 2nd LAYER
FIGURE 6. 3rd LAYER
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December 22, 2008
Application Note 1271
Layout
(Continued)
FIGURE 7. BOTTOM COMPONENTS (MIRRORED)
FIGURE 8. BOTTOM ETCH (MIRRORED)
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
7
AN1271.1
December 22, 2008
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