an9925

VRM8.5 Multiple-Output Motherboard Power
Controllers (ISL6523EVAL1, ISL6524EVAL1)
TM
Application Note
May 2001
AN9925
Author: Bogdan M. Duduman
Introduction
Today’s high-performance desktop PC architectures
demand power solutions featuring increased integration
and reduced system-level costs. The Intersil ISL6523 and
ISL6524 are complex controllers that integrate two and
one, respectively, switching regulators, as well as two and
three, respectively, linear controllers in a single package.
The switching converters employ voltage-mode control
architecture and high circuit performance is insured by the
use of high gain-bandwidth product error amplifiers, highaccuracy references, and continuously adaptive shootthrough protection. The ICs offer a full range of protection
features including overcurrent, overvoltage, as well as fault
condition signaling and/or shutdown. All these combined
features makes them ideal for microprocessor point-of-use
power supply solutions. The ISL6523 and ISL6524 were
designed to provide most of the active-state power needs
of a typical Tualatin-based system. Some Coppermine-T
and Celeron-based systems may also benefit from the
ISL6523 or ISL6524. [1,2]
The ISL6523EVAL1 and ISL6524EVAL1 evaluation boards
embody 4-output regulator solutions targeted at supplying
power to the microprocessor core (1.05V - 1.825V), AGTL+
communication bus (1.2V), 4X AGP video (1.5V), and the
ICH/MCH chip set core (1.8V).
Evaluation Board Setup
Important!
The evaluation boards were not designed to support a
continuous VCORE output current in excess of 15A for
extended periods of time. When testing either board to
VOUT1 output currents in excess of 15A, restrict the ON time
to less than 2 minutes, followed by at least 4 minutes OFF.
To facilitate the evaluation of the ISL6523 or ISL6524 in a
typical setting, both evaluation boards were designed to be
powered primarily from an ATX power supply [3]. However,
the boards have hook-up turret terminals that allow them to
be powered from standard laboratory power supplies.
Circuit Setup
Before connecting an input supply to the board, consult the
circuit schematics and familiarize yourself with the various
connection options offered by either evaluation board.
➤ Set the Power-On Switch
Ensure the ‘ATX ON’ (SW2) switch is in the off position (lever
pointing away from ‘ATX ON’ marking).
➤ Set Core Voltage SW1
SW1, by means of the on-chip D/A converter, sets the output
voltage for the VCORE (VOUT1) output according to the
1
corresponding table detailed in the IC’s data sheet. Consult
the data sheet and set the status of the VID pins according
to the core output voltage level you wish to regulate to.
➤ Hookup Guide Using Standard Bench Supplies
Connect a 5V, 16A supply to the +5VIN input, a 3.3V, 6A,
supply to the +3.3VIN input, and a +12V, 100mA to the
+12VIN input. Using a small jumper wire, connect the +5VIN
and +5VSB inputs. Connect typical loads to all the evaluation
board’s outputs. Consult Table 1 for maximum loads
supported by the design of the board in the configuration
received; read the ‘Modifications’ section for information on
modifying either evaluation board to meet your special needs.
➤ Hookup Guide Using a Standard ATX Supply
Connect the 20-pinATX connector to the on-board J1 mating
connector. Connect typical loads to all the evaluation board’s
outputs. Consult Table 1 for maximum loads supported by
the design of the board in the configuration received; read
the ‘Modifications’ section for information on modifying either
evaluation board to meet your special needs.
Operation
➤ Provide Power to the Board
Turn on the bench supplies. If using an ATX supply, plug it
into the mains, and if it has an AC switch, turn it on. The ‘ATX
OFF’ LED should light up, indicating the presence of 5V
standby on board. Flip on the ‘ATX ON’ switch and the ‘ATX
OFF’ LED should turn off. Shortly thereafter ‘VTT PGOOD’,
‘POWER GOOD’ and ‘ATX PGOOD’ LEDs should light up
indicating power good status on all the outputs, as well as
the input voltages provided by the ATX supply. If bench
supplies are used, the‘ATX OFF’ LED will only report the
status of the SW2 switch, and the ‘ATX PGOOD’ LED will not
light up under any circumstance; the other indicators will
preserve their functionality.
➤ Examine Start-Up Waveforms / Output Quality Under
Varying Loads
Start-up is immediate following application of bias voltage.
Using an oscilloscope or other laboratory equipment, you may
study the ramp-up and/or regulation of the controlled voltages
under various loading conditions. For maximum versatility, we
recommend the use of a programmable electronic load.
Fault Handling
In case of a fault condition (output undervoltage on the linear
outputs, or overcurrent on the switching output), the entire IC
shuts down and undergoes a re-start attempt. Three
consecutive fault situations on any of the outputs (single fault
on VOUT4, 1.8V output) latch the chip off. Review the
appropriate data sheet section for more detail.
1-888-INTERSIL or 321-724-7143
| Intersil and Design is a trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2001, All Rights Reserved
Application Note 9925
Reference Design
TABLE 1. ISL6523EVAL1 MAXIMUM OUTPUT LOADING
IOUT
dIOUT/dt
TOLERANCE
(STATIC/
DYNAMIC)
VCORE
(VOUT1)
22.0A(pk)
14.0A(avg)
20A/µs
Note 1
1.2VVTT
(VOUT2)
10.0A(pk)
4.0A(avg)
1A/µs
5% /9%
1.5VAGP
(VOUT3)
3.0A(pk)
1.0A(avg)
1A/µs
3% /5%
1.8VMCH
(VOUT4)
3.0A(pk)
1.0A(avg)
1A/µs
3% /5%
80
60
ISL6524EVAL1
40
VCORE
(VOUT1)
22.0A(pk)
14.0A(avg)
20A/µs
Note 1
1.2VVTT
(VOUT2)
6.0A(pk)
1.0A(avg)
1A/µs
5% /9%
1.5VAGP
(VOUT3)
3.0A(pk)
1.0A(avg)
1A/µs
3% /5%
1.8VMCH
(VOUT4)
3.0A(pk)
1.0A(avg)
1A/µs
3% /5%
General
VOUT1 DEVIATION FROM DAC SETPOINT (mV)
The evaluation board is built on 2-ounce, 4-layer, printed circuit
board (contact Intersil for layout plots). Most of the components
specific to the evaluation board alone, which are not needed in
a real computer application, are placed on the bottom side of
the board. Left on top of the evaluation board are the
components necessary to exemplify a typical application, as
well as the user interface (input/output terminals, test points,
switches, etc.).
20
0
-20
-40
-60
IDEAL LOAD LINE
STATIC TOLERANCE
DYNAMIC TOLERANCE
-80
0
2
4
6
8
10 12
IOUT (A)
OUTPUT
VOLTAGE
ISL6523EVAL1
NOTE:
1. See Figure 1 for regulation tolerance details.
14
16
18
20
22
FIGURE 1. VOUT1 REGULATION ENVELOPE
From a thermal performance perspective, do not operate the
evaluation board for extended periods of time at output current
levels exceeding the design envelope, as detailed in Table 1.
VOUT1 Regulation
Performance
The core regulator (VOUT1) was designed to meet the
regulation envelope detailed in Figure 1. With a DAC-set
regulation point of 1.750V, the output voltage conforms to the
regulation limits shown. Although the droop pictured
(difference between voltage at a lesser load and voltage at a
higher load) will be the same regardless of the DAC setting,
the offset shown will exhibit a proportional dependence. The
resistive divider sets this offset at 2.57%. For example, the
ideal load line at no load and 1.600V DAC setting will
actually originate at 41mV positive offset.
Figures 2 through 8 depict the evaluation boards’
performance during typical operational situations.To
simulate minimum loading conditions, unless otherwise
specified, the outputs were loaded with 65Ω resistive loads.
As performance is very similar amongst the two evaluation
boards, some characteristics were shown for only one of
them, with the implicit understanding of similarity (as
appropriate).
Design Envelope
Although an actual computer system application may have
somewhat different requirements, the ISL6523EVAL1 and
ISL6524EVAL1 boards were designed to meet the maximum
output loading described in Table 1. Dynamic output
tolerances and current ratings can be adjusted by properly
selecting the components external to the ISL6523 or
ISL6524.
2
Soft-Start Start-Up
Figure 2 shows a typical ISL6524EVAL1 start-up. For this
capture, the ATX supply powering the board is turned on, at
time T0. At time T1, the 1.8VMCH output starts ramping up,
maintaining less than a 2V difference to the ATX3.3V output
(sensed at the VAUX pin). At time T2, all input voltages
reach regulation, and the 1.2VVTT output starts its ramp-up.
At time T3, the 1.2VVTT output reaches VTT_PGOOD
threshold and SS13 is released. Shortly after T3, the still
rising SS24 brings the 1.8VMCH output in regulation. At T4,
the SS13 clamp starts releasing outputs 1 and 3 (VCORE
and 1.5VAGP), allowing them to ramp up to their regulation
levels. At time T5, all outputs controlled by the ISL6524 are
within regulation limits.
Application Note 9925
should yield a 1ms delay). At time T2, all conditions met,
PGOOD goes high.
3.3VIN
Note that the two power good pins are pulled high to VTT
and VCORE, respectively. If TTL compatibility is desired, feel
free to populate the provided spare footprints to ATX3.3V
level (while de-populating the default pull-up resistors).
500mV/DIV.
1.8VMCH
Transient Response
VCORE
1.2VVTT
1.5VAGP
GND>
For transient response testing, the evaluation boards were
subjected to the loading presented in Table 2. Each output
response was recorded while the corresponding transient load
was applied. The results are presented in Figures 4 and 5.
TABLE 2. TRANSIENT OUTPUT LOADING DESCRIPTION
2.5ms/DIV.
T0
T1
T2
T3
T4
T5
OUTPUT
IOUT(MIN)
(A)
Power Good Operation
The ISL6523 and ISL6524 output two PGOOD indicators
(both open-collector outputs). VTTPG is maintained high
(pulled high by external pull-up resistor) as long as the
1.2VVTT output exceeds 1.08V (90%; as sensed at the
VSEN pin). PGOOD is high for as long as VCORE is within
power good limits (+/-10%), all linears are above their
undervoltage (UV) thresholds, and VTTPG is also high.
500mV/DIV.
dIOUT/dt
(A/µs)
FREQUENCY
(Hz)
ISL6523EVAL1
FIGURE 2. ISL6524EVAL1 START-UP
1.8VMCH
VCORE
IOUT(MAX)
(A)
1.5VAGP
VCORE
(VOUT1)
2.0
22.0
1.0
2500
1.2VVTT
(VOUT2)
1.0
10.0
1.0
2000
1.5VAGP
(VOUT3)
0.3
3.0
1.0
1500
1.8VMCH
(VOUT4)
0.3
3.0
1.0
3000
ISL6524EVAL1
VCORE
(VOUT1)
2.0
22.0
1.0
2500
1.2VVTT
(VOUT2)
0.5
6.0
1.0
2000
1.5VAGP
(VOUT3)
0.3
3.0
1.0
1500
1.8VMCH
(VOUT4)
0.3
3.0
1.0
3000
NOTE: All transients 30% duty cycle.
1.2VVTT
VTTPG
PGOOD
T1
T2
1.75V>
FIGURE 3. ISL6524EVAL1 POWER GOOD INDICATORS
VCORE
20mV/DIV.
2.5ms/DIV.
T0
50mV/DIV.
GND>
1.20V>
3
1.80V>
1.5VAGP
20mV/DIV.
1.50V>
20mV/DIV.
1.2VVTT
Figure 3 details the operation of the power good functions.
Following the 1.2VVTT output rising above 1.08V at time T0,
VTTPG goes high simultaneously with enabling of the
VCORE regulator, approximately 4.5ms later. This timing
delay is given by the SS13 capacitor charging under a 28µA
constant current, to about 1.25V (bottom of internal oscillator
ramp). To reduce the delay, while preserving the same
ramping rate for the VCORE output, insert a resistor (footprint
provided; R18 and R22, respectively) of up to 100kΩ in
series with the SS13 soft-start capacitor (100kΩ resistor
1.8VMCH
100µs/DIV.
FIGURE 4. ISL6524EVAL1 OUTPUT TRANSIENT RESPONSE
50mV/DIV.
Application Note 9925
VCORE
1.2VVTT
1.50V>
1.5VAGP
20mV/DIV.
1.80V>
20mV/DIV.
1.20V>
50mV/DIV.
1.75V>
The chip has two independent fault counters. Three
consecutive fault events on either outputs 1 or 3, or three
consecutive fault events on output 2 will set the latch. Figure
7 details an example of such a situation where the overload
is removed before the counter increments to three and
latches the chip off. Time T0 marks the application of the
current overload. At time T1 a second fault is recorded, but
the overload is removed at time T2. Second restart attempt
at time T3 is successful, bringing the output in regulation and
resetting the fault counter.
1.8VMCH
FAULT DURATION
100µs/DIV.
+5VIN
FIGURE 5. ISL6523EVAL1 OUTPUT TRANSIENT RESPONSE
1.00V/DIV.
SS24 (TP7)
Output Short-Circuit Protection
FAULT DURATION
VOUT1
GND>
IOUT1
10A/DIV.
In response to an overcurrent event on the switcher’s output, or
an undervoltage event on any of the linear outputs, the entire
chip is shut down. Figure 6 exemplifies such a scenario on
VOUT1 of the ISL6524EVAL1. At time T0, an overload is
applied to the core regulator output. Output current on this
output increases, ultimately tripping the overcurrent (OC)
protection. The fault counter is incremented and SS24
capacitor is discharged, timing a restart attempt. The restart
takes place as the SS24 ramps up, and as the output voltage
builds up, a second OC event is triggered at T1. The fault
counter is incremented and the process repeats at time T2. At
time T3 the fault counter reaches a count of three and the chip
latches off. SS24 discharges down to about 1V, remaining at
this level until bias voltage is removed.
5ms/DIV.
T0
T1
T2
T3
FIGURE 6B. ISL6524EVAL1 VOUT1 OVERCURRENT
PROTECTION RESPONSE
ISL6524EVAL1 Switching Regulator Efficiency
Figure 7 highlights the evaluation board’s conversion
efficiency with only the switching section loaded (VCORE).
The measurement was performed at room temperature with
the linear outputs open and 100 LFM of air flow.
+5VIN
90
VOUT1
500mV/DIV.
GND>
10A/DIV.
I OUT1
10ms/DIV.
T0
T1
T2 T3
86
EFFICIENCY (%)
SS24 (TP7)
1.00V/DIV.
88
84
82
80
78
76
74
72
0
FIGURE 6A. ISL6524EVAL1 VOUT1 OVERCURRENT
PROTECTION RESPONSE
2
4
6
8
10
12
14
OUTPUT CURRENT (A)
16
FIGURE 7. ISL6524EVAL1 SWITCHING REGULATOR
MEASURED EFFICIENCY (ALL LINEAR
OUTPUTS UNLOADED)
4
18
20
Application Note 9925
Modifications
Adjusting the Output Voltage
All linear outputs controlled by the ISL6523 and ISL6524 are
adjustable by means of the resistive divider connecting the
VSEN pins to their respective outputs. If adjusting the output
voltage of the linear regulators, please pay attention to the
recommended resistor value selection guidelines described
in the data sheet. As the chips feature internal resistive
dividers that set the output voltages, in order to minimize DC
set-point interference with these resistors, it is
recommended the parallel combination of the external
resistive divider components be kept below 2kΩ to 5kΩ.
Furthermore, the ISL6524 has provisions (by grounding the
FIX pin) for bypassing the internal resistive dividers.
between two output voltage settings. The recommended
circuits for the dual processor GTL VTT and universal AGP
support implementation are shown in Figures 8 and 9. As
both the ISL6523 and ISL6524 were designed to regulate
the voltage present at the VSEN2 pin to 1.2V, the resistive
divider made out of Rs and Rp1 raise the DC regulation
setting of this output to 1.25V, while Qx is off. When Qx is
turned on (by means of a high TUAL5 signal), Rp2 is
connected in parallel to Rp1, raising the DC regulation
setting of this output to 1.5V.
+3.3VIN
DRIVE3
VOUT3 (AGP)
+1.5V / +3.3V
UGATE2
+1.25V / +1.5V
PHASE2
+
Rs
VSEN2
1
2
+
ISL6523
VOUT2 (VTT)
200Ω
VSEN3
Rp
162Ω
18
19
ISL6523/4
Qx
2N7002
11
200Ω
Ω
FIGURE 9. ISL6523, ISL6524 UNIVERSAL AGP SUPPORT
IMPLEMENTATION
Rp2
953Ω
Ω
Rp1
4.75kΩ
Ω
TO TUAL5 SIGNAL
Same theory of operation applies to the circuit in Figure 9,
with the exception that while Qx is off (low TYPEDET signal)
the output is regulated to the internally-set 1.5V. A
TYPEDET high signal turns on Qx and raises the output
voltage to 3.3V. If AGP2X support is provided (3.3V output),
remember that for a low voltage drop across the pass
element, a low rDS(ON) MOSFET needs to be selected (Q4
in circuit schematics).
Qx
2N7002
DRIVE2
VOUT2 (VTT)
1
Rs
VSEN2
11
ISL6524
+1.25V / +1.5V
+
TO TYPEDET SIGNAL
Rs
200Ω
Rp2
953Ω
Rp1
4.75kΩ
TO TUAL5 SIGNAL
Qx
2N7002
FIGURE 8. ISL6523, ISL6524 DUAL PROCESSOR GTL
IMPLEMENTATION
Recommended Implementation for Dual Processor
GTL VTT and Universal AGP Support
As both ICs have fixed output voltages, it is necessary to
implement an external circuit that helps switch a given output
5
Important to mention is the fact that for either regulator on
either IC, a sudden turn-on of Qx while the corresponding
output is within regulation may trigger an undervoltage
and/or overcurrent event, resulting in a chip shutdown and
consequent re-start. If Qx is to be turned on while the
outputs are regulating, an RC low-pass network needs be
placed in series with its gate, in order to slow down its turnon (if a pull-up is used to generate the logic high signal, then
only the capacitor needs to be added). For this low-pass RC
network, a time constant of about 200-300µs is
recommended.
Improving Output Voltage Tolerance
The key to improving the output voltage tolerance is
identifying the parameters which affect it, and then taking
steps toward improving them.
Application Note 9925
AC Tolerance
High dV/dt spikes present in the output voltage waveform
under highly dynamic load application (high dI/dt) are due to
the ESR and the ESL of the output capacitance. These
spikes coincide with the transient load’s rising and falling
edges, and decreasing their amplitude can be achieved by
using lower ESR/ESL output capacitors (such as surfacemount tantalum capacitors), and/or the addition of more
ceramic capacitors, which have inherently low ESR/ESL.
DC Tolerance
The no-load DC output voltage tolerance reduces virtually to
the tolerance of the controller and that of the resistors in the
DC feedback path. As the regulation tolerance of the
controller is a design constraint, the only way to improve the
DC regulation reduces to using precision resistors in the DC
feedback path.
If output inductor based droop is employed (as shown in the
default shipping configuration), the output voltage droop will
also exhibit a temperature variation. As temperature will
affect the DC resistance of the output inductor, the slope of
the output droop will increase slightly with temperature.
VRM8.5 (Rev. 1.0) Compliance
Although the transient response of the ISL6523EVAL1 and
ISL6524EVAL1 evaluation boards may prove satisfactory, to
build a well designed application around any of these two
controllers requires careful consideration of all the
parameters involved in the output regulation. Such careful
analysis of these two designs suggests that to yield a 22A
VRM8.5 compliant regulator, one more capacitor is needed
6
in parallel with the VOUT1 output (same type as already
populated). Additionally, to support the increased input RMS
current of a continuous 22A load, another input capacitor is
also required in parallel with C1 (same type as C1).
However, compliance with this set of standards is not directly
related to the use of a certain capacitor technology. Several
solutions to meeting the output regulation requirements can
be derived, using capacitors from various vendors, with
distinctly different characteristics.
Conclusion
The ISL6523EVAL1 and ISL6524EVAL1 evaluation boards
showcase highly integrated approaches to providing system
power control in late Pentium 3 computer systems. Typical
implementation requires minimum effort and a reduced
number of external components, yet provides a full array of
standard features.
References
For Intersil documents available on the internet, see web site
www.intersil.com/
[1] ISL6523 Data Sheet, Intersil Corporation, Power
Management Products Division, Document No.
FN9024, 2001.
[2] ISL6524 Data Sheet, Intersil Corporation, Power
Management Products Division, Document No.
FN9015, 2001.
[3] ATX Specification, Version 2.02, October 1998, Intel
Corporation (http://www.teleport.com/~atx/).
Application Note 9925
ISL6523EVAL1 Schematic
+5VIN
+5VIN
4, 6, 19, 20
ATX CONNECTOR
J1
L1
1µH
+12VIN
10
+
C1
680µF
+12VIN
+3.3VIN
1, 2, 11
GND
GND
+5VSB
9
GND
C2
1µF
PGOOD
8
C3
1nF
PS_ON
14
3, 5, 7, 13,
15, 16, 17
C5
1µF
C4
1nF
VCC
R2
10
GND
2.2kΩ
VOUT2 (VTT)
OCSET2
+
C6
1µF
UGATE2
26
25
11
24
R7
10kΩ
R6
SPARE
22
VTTPG
TP4
VAUX
+3.3VIN
C15
10µF
Q4
HUF76107
DRIVE3
+1.5V
C17
1µF
R13
+
0Ω
C18
560µF
DRIVE4
C20
1µF
R15
+
21
18
19
6
5
4
VSEN4
0Ω
R16
SPARE
C21
560µF
15
12
14
17
GND
13
VOUT1 (CORE)
(1.050V to 1.825V)
PHASE1
1.8µH
Q2
HUF76143
LGATE1
+
R21
SHORT
R22
SPARE
R5
4.99kΩ
PGND
VSEN1
C12
0.30µF
R8
FB1
COMP1
C13
270pF
C16
R11
2.2nF
43kΩ
C14
R10
22nF
33Ω
R12
267kΩ
VID25
‘VID25’
VID0
‘VID0’
VID1
‘VID1’
VID2
‘VID2’
VID3
‘VID3’
SS24
SW1
TP6
C19
0.1µF
SS13
C22
0.1µF
R17
100Ω
R18
0Ω
7
R20
SHORT
L3
3.32kΩ
20
16
R14
SPARE
TP7
+1.8V
U1
ISL6523
3
Q5
2SD1802
VOUT4 (MCH)
9
7
VSEN3
Q1
HUF76139
UGATE1
+
TP5
VOUT3 (AGP)
TP3
10kΩ
2
CR1
HSM835
VSEN2
PGOOD
1
27
PHASE2
C7
1000µF
R1
SPARE
TP1
OCSET1 1.5kΩ
R4
2.0µH
+1.2V
23
8
Q3
HUF76121
L2
TP2
R3
28
PB1
‘SHUTDOWN’
R9
12.1kΩ
C11
1µF
C8-10
3x1000µF
Application Note 9925
ISL6523EVAL1 Schematic
(Continued)
+5VSB
RN1
4x680Ω
5VSB (J1)
PGOOD (J1)
‘ATX PGOOD’ ‘VTT PGOOD’
LP2
LP3
LP1
‘ATX OFF’
7,8
PS_ON (J1)
4
5,6
2
7,8
LP4
‘POWER GOOD’
5,6
2
1
VTTPG (U1)
QA1
3
1
4
3
QA2
PGOOD (U1)
R19
30Ω
C23
10nF
SW2
‘ATX ON’
ISL6524EVAL1 Schematic
+5VSB
RN1
4x680Ω
5VSB (J1)
PGOOD (J1)
‘ATX PGOOD’ ‘VTT PGOOD’
LP2
LP3
LP1
‘ATX OFF’
7,8
PS_ON (J1)
5,6
2
7,8
5,6
2
1
VTTPG (U1)
PGOOD (U1)
R23
30Ω
C22
10nF
SW2
‘ATX ON’
8
4
LP4
‘POWER GOOD’
QA1
3
1
4
QA2
3
Application Note 9925
ISL6524EVAL1 Schematic
(Continued)
+5VIN
+5VIN
4, 6, 19, 20
ATX CONNECTOR
J1
L1
1µH
+12VIN
10
+
C1
680µF
+12VIN
+3.3VIN
1, 2, 11
+5VSB
9
GND
GND
PS_ON
14
3, 5, 7, 13,
15, 16, 17
C2
1µF
R1
SPARE
PGOOD
8
R24
SPARE
FIX
GND
VCC
R2
28
23
2
R3
SPARE
TP1
OCSET1 1.5kΩ
8
DRIVE2
TP2
VOUT2 (VTT)
VSEN2
PGOOD
10kΩ
1
11
27
Q1
HUF76139
UGATE1
+1.2V
C6
1000µF
C5
1µF
FAULT/RT
26
10
TP4
25
R6
SPARE
R9
SPARE
24
R10
10kΩ
22
VTTPG
TP5
9
U1
21
VAUX
C14
10µF
Q4
HUF76107
PHASE1
DRIVE3
+1.5V
C16
1µF
+
R16
0Ω
C17
560µF
Q5
2SD1802
+1.8V
C19
1µF
R18
+
18
6
19
5
4
3
TP8
VOUT4 (MCH)
20
16
R17
SPARE
DRIVE4
VSEN4
0Ω
R19
SPARE
C20
560µF
R7
4.99kΩ
PGND
R8
SPARE
VSEN1
C11
0.30µF
R11
FB1
COMP1
15
12
14
17
GND
13
C12
270pF
C15
R14
2.2nF
43kΩ
C13
R13
22nF
33Ω
R15
267kΩ
VID25
‘VID25’
VID0
‘VID0’
VID1
‘VID1’
VID2
‘VID2’
VID3
‘VID3’
SS24
SW1
TP7
C18
0.1µF
SS13
C21
0.1µF
R20
100Ω
R22
0Ω
9
+
R5
SHORT
3.32kΩ
7
VSEN3
1.8µH
Q2
HUF76143
LGATE1
+
TP6
VOUT1 (CORE)
R21
SHORT (1.050V to 1.825V)
L2
ISL6524
+3.3VIN
VOUT3 (AGP)
TP3
R4
Q3
HUF76107
+
GND
C3
1µF
C4
1nF
PB1
‘SHUTDOWN’
R12
12.1kΩ
C10
1µF
C7-9
3x1000µF
Application Note 9925
ISL6523EVAL1 Bill of Material s
REFERENCE DESIGNATOR
PART NUMBER
CASE /
FOOTPRINT
DESCRIPTION
MANUF. OR
VENDOR
QTY
C1
6SP680M
Oscon Capacitor, 6.3V, 680µF
10 x 10.5
Sanyo
C2
1206YC105KAT2A
Ceramic Capacitor, X7R, 16V, 1.0µF
1206
AVX
1
1
C3, 4
0603YC102KAT2A
Ceramic Capacitor, X7R, 16V, 1.0nF
0603
AVX
2
C5, 6, 11, 17, 20
1206YC105KAT2A
Ceramic Capacitor, X7R, 10V, 1.0µF
0805
AVX
5
C7-10
2SP1000M
Oscon Capacitor, 2V, 1000µF
10 x 10.5
Sanyo
4
C12
0805ZC304KAT2A
Ceramic Capacitor, X7R, 10V, 0.30µF
0805
AVX
1
C13
06033C271KAT2A
Ceramic Capacitor, X7R, 25V, 270pF
0603
AVX
1
C14
06033C223KAT2A
Ceramic Capacitor, X7R, 25V, 22nF
0603
AVX
1
C15
TAJB106M006R
Tantalum Capacitor, 6.3V, 10µF
3.0 x 4.0
AVX
1
C16
06033C222KAT2A
Ceramic Capacitor, X7R, 25V, 2.2nF
0603
Any
1
C18, C21
4SP560M
Oscon Capacitor, 4V, 560µF
8 x 10.5
Sanyo
2
C19, C22
0603ZC104KAT2A
Ceramic Capacitor, X7R, 10V, 0.1µF
0603
AVX
2
C23
0603YC103KAT2A
Ceramic Capacitor, X7R, 16V, 10nF
0603
AVX
1
CR1
HSM835J
Schottky Diode, 35V, 8A
DO-214AB
Microsemi
1
J1
39-29-9203
20-pin Mini-Fit, Jr.TM Header Connector
Molex
1
L1
1.0µH Inductor
6 Turns of 16AWG onT44-52 Core
8 x 15
Any
1
L2
2.0µH Inductor
8 Turns of 16AWG on T50-52 Core
8 x 17
Any
1
L3
1.8µH Inductor
6 Turns of 16-18AWG on T68-52 Core
10 x 21
Any
1
LP1-4
L63111CT-ND
Miniature LED, Through-Board Indicator
Digikey
4
Q1
HUF76139S3S
UltraFETTM MOSFET, 30V, 7.5mΩ
TO-263AB
Intersil
1
Q2
HUF76143S3S
UltraFETTM MOSFET, 30V, 5.5mΩ
TO-263AB
Intersil
1
TO-252AA
Intersil
1
TO-252AA
Intersil
1
Q3
HUF76121D3S
Q4
HUF76107D3S
UltraFETTM MOSFET, 30V, 23mΩ
UltraFETTM MOSFET, 30V, 52mΩ
Q5
2SD1802
NPN Bipolar, 50V, 3A
TO-252AA
Sanyo
1
QA1, 2
ZXMD63N02X
Small-Signal Dual MOSFET, 20V, 0.2Ω
MSOP-8
Zetex
2
PB1
P8007S-ND
Push-Button, Miniature
Digikey
1
R2
2.2kΩ
Resistor, 5%, 0.1W
0603
Any
1
R3
1.5kΩ
Resistor, 5%, 0.1W
0603
Any
1
R4, 7
10kΩ
Resistor, 5%, 0.1W
0603
Any
2
R5
4.99kΩ
Resistor, 1%, 0.1W
0603
Any
1
R8
3.32kΩ
Resistor, 1%, 0.1W
0603
Any
1
R9
12.1kΩ
Resistor, 1%, 0.1W
0603
Any
1
R10
33Ω
Resistor, 5%, 0.1W
0603
Any
1
R11
43kΩ
Resistor, 5%, 0.1W
0603
Any
1
R12
267kΩ
Resistor, 1%, 0.1W
0603
Any
1
R13, 15, 18
0Ω
Shorting Resistor
0603
Any
3
R17
100Ω
Resistor, 5%, 0.1W
0603
Any
1
R19
30Ω
Resistor, 5%, 0.1W
0603
Any
1
R1, 6, 14, 16
Spare
0603
R20, 21
Spare
2512
R22
Spare
RN1
Y9681CT-ND
Digikey
1
0603
4-Resistor Network, 680Ω, 5%, 0.1W
3.2 x 1.6
SW1
CKN3057-ND
Miniature Dip Slide Switch, 5-Pole
Digikey
1
SW2
GT12MSCKE
Miniature Switch, Single Pole, Single Throw
C&K
1
TP2, 3, 5, 7
1314353-00
Test Point, Scope Probe
Tektronics
4
TP1, 4, 6
SPCJ-123-01
Test Point
Jolo
3
U1
ISL6523CB
Dual Switcher and Dual Linear Controller SOIC-28
Intersil
1
Terminal Post
Keystone
16
1514-2
+5VSB, +5VIN, +3.3VIN, +12VIN,
+VOUT1, +VOUT2, +VOUT3, +VOUT4, GND
10
Mini-Fit, Jr.™ is a trademark of Molex, Inc.
UltraFET® is a registered trademark of Intersil Americas Inc.
Application Note 9925
ISL6524EVAL1 Bill of Material s
REFERENCE DESIGNATOR
PART NUMBER
DESCRIPTION
CASE /
FOOTPRINT
MANUF. OR
VENDOR
QTY
C1
6SP680M
Oscon Capacitor, 6.3V, 680µF
10 x 10.5
Sanyo
1
C2
1206YC105KAT2A
Ceramic Capacitor, X7R, 16V, 1.0µF
1206
AVX
1
2
C4
0603YC102KAT2A
Ceramic Capacitor, X7R, 16V, 1.0nF
0603
AVX
C3, 5, 10, 16, 19
1206YC105KAT2A
Ceramic Capacitor, X7R, 10V, 1.0µF
0805
AVX
5
C6-9
2SP1000M
Oscon Capacitor, 2V, 1000µF
10 x 10.5
Sanyo
4
C11
0805ZC304KAT2A
Ceramic Capacitor, X7R, 10V, 0.30µF
0805
AVX
1
C12
06033C271KAT2A
Ceramic Capacitor, X7R, 25V, 270pF
0603
AVX
1
C13
06033C223KAT2A
Ceramic Capacitor, X7R, 25V, 22nF
0603
AVX
1
C14
TAJB106M006R
Tantalum Capacitor, 6.3V, 10µF
3.0 x 4.0
AVX
1
C15
06033C222KAT2A
Ceramic Capacitor, X7R, 25V, 2.2nF
0603
Any
1
C17, C20
4SP560M
Oscon Capacitor, 4V, 560µF
8 x 10.5
Sanyo
2
C18, C21
0603ZC104KAT2A
Ceramic Capacitor, X7R, 10V, 0.1µF
0603
AVX
2
C22
0603YC103KAT2A
Ceramic Capacitor, X7R, 16V, 10nF
0603
AVX
1
J1
39-29-9203
20-pin Mini-Fit, Jr.TM Header Connector
Molex
1
L1
1.0µH Inductor
6 Turns of 16AWG on T44-52 Core
8 x 15
Any
1
10 x 21
Any
1
Digikey
4
Intersil
1
L2
1.8µH Inductor
6 Turns of 16-18AWG on T68-52 Core
LP1-4
L63111CT-ND
Miniature LED, Through-Board Indicator
Q1
HUF76139S3S
UltraFETTM MOSFET, 30V, 7.5mΩ
TO-263AB
Q2
HUF76143S3S
TO-263AB
Intersil
1
Q3, Q4
HUF76107D3S
UltraFETTM MOSFET, 30V, 5.5mΩ
UltraFETTM MOSFET, 30V, 52mΩ
TO-252AA
Intersil
2
Q5
2SD1802
NPN Bipolar, 50V, 3A
TO-252AA
Sanyo
QA1, QA2
ZXMD63N02X
Small-Signal Dual MOSFET, 20V, 0.2Ω
MSOP-8
Zetex
2
PB1
P8007S-ND
Push-Button, Miniature
Digikey
1
R2
1.5kΩ
Resistor, 5%, 0.1W
0603
Any
1
R7
4.99kΩ
Resistor, 1%, 0.1W
0603
Any
1
R4, R10
10kΩ
Resistor, 5%, 0.1W
0603
Any
2
R11
3.32kΩ
Resistor, 1%, 0.1W
0603
Any
1
R12
12.1kΩ
Resistor, 1%, 0.1W
0603
Any
1
R13
33Ω
Resistor, 5%, 0.1W
0603
Any
1
R14
43kΩ
Resistor, 5%, 0.1W
0603
Any
1
R15
267kΩ
Resistor, 1%, 0.1W
0603
Any
1
1
R16, R18, R22
0Ω
Shorting Resistor
0603
Any
3
R20
100Ω
Resistor, 5%, 0.1W
0603
Any
1
R23
30Ω
Resistor, 5%, 0.1W
0603
Any
1
R1, R3, R6, R8, R9, R17, R19, R24
Spare
R5, R21
Spare
RN1
Y9681CT-ND
Digikey
1
0603
2512
4-Resistor Network, 680Ω, 5%, 0.1W
3.2 x 1.6
SW1
CKN3057-ND
Miniature Dip Slide Switch, 5-Pole
Digikey
1
SW2
GT12MSCKE
Miniature Switch, Single Pole, Single
Throw
C&K
1
TP2, 3, 6, 8
1314353-00
Test Point, Scope Probe
Tektronics
4
TP1, 4, 5, 7
SPCJ-123-01
Test Point
Jolo
4
U1
ISL6524CB
Dual Switcher and Dual Linear Controller SOIC-28
Intersil
1
+5VSB, +5VIN, +3.3VIN, +12VIN,
+VOUT1, +VOUT2, +VOUT3, +V OUT4,
GND
1514-2
Terminal Post
Keystone
16
11
Application Note 9925
All Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at website www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design 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 web sit ewww.intersil.com
Sales Office Headquarters
NORTH AMERICA
Intersil Corporation
2401 Palm Bay Rd., Mail Stop 53-204
Palm Bay, FL 32905
TEL: (321) 724-7000
FAX: (321) 724-7240
12
EUROPE
Intersil SA
Mercure Center
100, Rue de la Fusee
1130 Brussels, Belgium
TEL: (32) 2.724.2111
FAX: (32) 2.724.22.05
ASIA
Intersil Ltd.
8F-2, 96, Sec. 1, Chien-kuo North,
Taipei, Taiwan 104
Republic of China
TEL: 886-2-2515-8508
FAX: 886-2-2515-8369