an1302

ISL6237EVAL1 Evaluation Kit
®
Application Note
This application note describes the ISL6237 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 ISL6237. 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 ISL6237, please consult the
ISL6237 Data Sheet on the Intersil Company website
(http://www.intersil.com)
September 23, 2008
AN1302.1
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 3.3V
•VREF3: P14(+) to P8(-), It should read 3.3V
• ISL6237 EVAL1 REV B Board
•CHARGE PUMP: P28(+) to P8(-), it should read 14.0V.
• ISL6237 Data Sheet
• ISL6237 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 ISL6237EVAL1 is an adaptable evaluation tool which
showcases the performance of the ISL6237 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. 2007, 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Application Note 1302
Detailed Description of Switch Settings.
SWITCH
NAME
FUNCTION
POSITION
CONNECTION
SW1
EN2
VOUT2
OUTPUT
CONTROL
1
EN2 to GND.
VOUT2 output shut-down.
2
EN2 to VCC.
VOUT2 output active.
3
EN2 to REF.
VOUT2 sequence to VOUT1 output.
1
BYP to GND
Sets BYP to 0V, no LDO switchover
2
BYP to Vout1
Sets BYP to Vout1
3
BYP to Vout2
Sets BYP to Vout2
1
LDO to GND
LDO output shut-down
2
LDO to VCC
LDO output active
3
N/C
1
EN1 to GND.
VOUT1 output shut-down.
2
EN1 to VCC.
VOUT1 output active.
3
EN1 to REF.
VOUT1 sequence to VOUT2 output.
1
SKIP# to GND
Normal Operation Mode, allow automatic PWM/PFM switchover for
pulse -skipping at light load
2
SKIP# to VCC
Low Noise, Fixed-frequency PWM Mode
3
SKIP# to REF
Ultrasonic pulse-skipping mode(20KHz Min)
SW3
SW4
SW5
BYP
EN_LDO
OPERATING
MODE
LDO
CONTROL
EN1
SKIP#
Evaluating Variable Output Voltage
No connect
Pinouts
The ISL6237EVAL1 kit outputs are preset to 5V/7A,
3.3V/11A and 5V/200mA on LDO.
2
SKIP#
POK2
EN2
UGATE2
PHASE2
31
30
29
28
27
26
25
2
23 LGATE
VCC
3
22 PGND
EN_LDO
4
21 GND
N/C
5
20 N/C
VIN
6
19 PVCC
LDO
7
18 LGATE
LDOREFIN
8
17 BOOT1
9
10
11
12
13
14
15
UGATE1
TON
EN1
24 BOOT2
POK1
1
ILIM1
REF
FB1
The VOUT2 can track REFIN2 at 1:1 ratio with input voltage
range from 0.7V to 2.5V. Likewise, the LDO output can also
track LDOREFIN at 1:2 with voltage range from 0.35V to
2.25V.
32
OUT1
where VFB = 0.7V
OUT2
(EQ. 1)
BYP
R13
R14 = --------------------------------------------( V OUT ⁄ V FB ) – 1
ILIM2
The VOUT1 can also be adjusted between 0.7V to 5.5V by
changing the value of R13 and R14 given by Equation :
REFIN2
ISL6237
(32 LD 5X5 QFN)
TOP VIEW
16
PHASE1
SW2
RESULT
AN1302.1
September 23, 2008
I
1
P18
R22
P3
5
0.1UF
R5
SW3
EN1
POK1
P24 POK2
1
2
3
1
P17
C26
3
0.1UF
C24
2
1
C31
DNP
D1 DNP
1
2
1
C29
2
3
1
DNP
3
D8
OPEN
R6
C5
P28
SW4
1
2
3
P16
330UF
0.1UF
3
1
C23
D6
2
DNP
1
OPEN
330UF
C32
2
1
D7
1
2
200K
200K
R4
1
1
2 P23
4
P8
DNP
OPEN
VOUT2
61
5
VOUT1
4
6
5
4
C12
C2
VCC
OPEN
OPEN
1
2
3
P15
DNP
R26
DNP
C30
5
2
4
C28
6
OPEN
3
C17
1
7
D5
1
8
Q4
2
DNP
IRF7811AV
PVCC
OPEN
1
EN_LDO
P27
R34
BYP
AN1302.1
September 23, 2008
FIGURE 1. ISL6237EVAL1 REV B KIT SCHEMATIC
R33
DNP
SKIP#
P7
VOUT1
1
2
C6
C1
1UF
L1
4.7UH
C13
1
2
3
4
4
3
6
OPEN
P12
2
3
C15
2
7
R32
EN2
0
R17
1
0.1UF
1
3
2
3
1
2 P21
DNP
1 DNP
C16
R8
17
PHASE1
1
6
5
4
R14
P6
VIN
8
Q3
10UF
1
18
FB1
1
1
2 P22
4
1
OPEN
1
2
3
1
2
3
P11
R25
DNP
IRF7807V
OPEN
6
5
4
D4
5
TON
SW5
1
C27
6
4
IRF7811AV
P30
SW2
VOUT2 P5
OPEN
7
3
REF
6
5
4
C14
10UF
2
R23
SW1
1
1
8
Q2
DNP
C10
0.1UF
1
R1
3
3
R2
OPEN
POK1
EN1
1
1
2 P20
4
P4
OPEN
C8
1UF
OPEN
1
2
L2
1
D9
BYP
9
OPEN
C3
R19
OPEN
R20
VCC
0
5
D2
VOUT1
0
R3
VCCIN
R24 LDO
PVCC
1
4
19
BOOT1
0
P29
OPEN
R27
OPEN
6
DNP
0
EP
7
3
20
LGATE1
LDOREFIN
2
C11
4.7UF
PHASE2
P19 4
21
PVCC
LDO
OPEN
1
P26
ISL6237
VIN
Q1
22
NC
VIN
8
1
23
GND
NC
33
24
PGND
U1
EN_LDO
R12
R7
R31
C19
P2
8
VCC
200K
LDO
OPEN
C7
1UF
7
LGATE2
1
1
Application Note 1302
6
0
TON
R16
5
1
R15
32
31
30
29
28
27
26
25
REFIN2
ILIM2
OUT2
SKIP#
POK2
EN2
UGATE2
PHASE2
4
BOOT2
BYP
OUT1
FB1
ILIM1
POK1
EN1
UGATE1
PHASE1
3
VIN R30
1
P1
2
D3
PVCC
1
DNP
10
VOUT1
11
12
13
14
15
16
TON
VCC
EN_LDO
1
IRF7807V
VCC
R13
REF
R11
C4
P14
1
C9
OPEN
VCC
VREF3
REF
0.1UF
C18
OPEN
0
3
R10
R9
OPEN
1
OPEN
VREF3
150K
VOUT2
SKIP#
POK2
EN2
0
R21
LDO
OPEN
Application Note 1302
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
C4, C6, C10, C23, C24, C26 H1046-00104-50V10
6
GENERIC
0.1µF, 50V, X7R, 0805
C27, C28
OPEN
0
C29, C30
6TPD330M
2
C2, C3, C5, C9, C12, C13,
C15, C17, C18, C19
OPEN
C31, C32
OPEN
0
POSCAP
Cap, SMD, Size D, DNP
D1, D4, D5, D6
OPEN
0
DIODES-INC
DNP
D2, D3
OPEN
0
ON-SEMI
DNP
D7, D8
OPEN
0
DIODES
DNP, 0.2A, 30V, Schottky SOT23
D9
Open
0
ON-SEMI
2A, 30V, Schottky SOT23
L1. L2
SD1003
2
FALCO
4.7µH, 20% 8.3A, 12.5mmx12.5mm Shielded
P1, P2, P5 to P8
1514-2
6
KEYSTONE
Test Point Turret 0.150 Pad 0.100 Thole
P19 to P23
131-4353-00
5
TEKTRONIX
Scope Probe Test Point PCB Mount
P3, P11, P12, P14 to P18,
P24, P26, P27, P28, 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, R6, R7, R9, R11, R13,
R14, R19, R20, R22, R23,
R27, R32, R33, R34
OPEN
R25, R26
OPEN
R3, R10, R12, R17, R21,
R24, R30, R31
H2512-00R00-1/10W
R4, R5, R16,
H2512-02003-1/10W1
SW1 to SW5
U1
Cap, SMD, 1206, Do Not Populate(DNP)
POSCAP SANYO
Cap, SMD, 0805, Do Not Populate(DNP)
0
13
330µF, 6.3V, POS CAP 9mΩ, D size
Res, SMD, 0805, DNP
0
0
CAP, SMD, 1206, DNP
GENERIC
0Ω, 1%, 0805
3
GENERIC
200kΩ, 1%, 0805
78B03S
5
GRAYHILL
Dip Switch SPST (Raised Slide)
ISL6237IRZA
1
INTERSIL
High-Efficiency, Quad Output Controller
4
8
AN1302.1
September 23, 2008
Application Note 1302
Layout
FIGURE 2. TOP COMPONENTS
FIGURE 3. TOP ETCH
FIGURE 4. 2nd LAYER
FIGURE 5. 3rd LAYER
5
AN1302.1
September 23, 2008
Application Note 1302
Layout
(Continued)
FIGURE 6. BOTTOM COMPONENTS (MIRRORED)
FIGURE 7. 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
6
AN1302.1
September 23, 2008
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