an9976

Peripheral Power Controller for Pentium® 4
Computer Systems (ISL6432EVAL1)
TM
Application Note
Introduction
The progress of the advanced computing cores coming from
microprocessor manufacturers such as Intel® and AMD ®
have necessitated a change in the topology of the switching
regulators traditionally used to power these processor cores.
Multiphase buck regulators have proven to be the topology
of choice for such high-current applications. However, the
distributed power system architecture of these computers
continue to have a need for other sub-system specific
voltages. The ISL6432 was created to complement a
multiphase buck controller in creating a complete power
solution for the typical Pentium 4 system. Athlon™-class
processor based systems (AMD) may also benefit from the
ISL6432. [1]
The ISL6432EVAL1 evaluation board embodies a 4-output
regulator solution targeted at supplying power to the system
memory (2.5V), system clock (2.5V), ICH/MCH chip set core
(1.8V), and the 4X AGP video (1.5V), with provisions for
ACPI power management implementation. [2]
Quick Start Evaluation
AN9976
Each output can thus be turned off or kept running in S3
and/or S5 states, with corresponding consequences. For
initial evaluation, we recommend closing positions 2, 4, and
6-8 (see Figure 1 for detail). Unless otherwise specified, this
recommended SW3 configuration was employed throughout
testing of the board described in this application note.
VOUT1
VOUT2
VOUT3
VOUT4
S0
S3
S5
ON
ON
ON
ON
ON
OFF
ON
OFF
ON
OFF
OFF
OFF
1
2
3
4
5
6
7
8
OPEN
FIGURE 1. SW3 DETAIL (RECOMMENDED INITIAL
CONFIGURATION) - SLEEP STATES SUPPORT
³ Set Jumpers JP1-4
Important!
To facilitate the evaluation of the ISL6432 in a typical setting,
the ISL6432EVAL1 was designed to be powered primarily
from an ATX supply. However, the board does have hook-up
turret terminals that allow it to be piggy-backed in an actual
computer system, or be powered from standard laboratory
power supplies
If an ATX power supply is used to power the board (using
the on-board 20-pin connector), remember that regulation of
most ATX supplies is generally dependent on the presence
of a DC load on the main 5V output. Therefore, for best
results, have a 5Ω/25W-50W power resistor connected to
the 5V output of the ATX supply (take necessary
precautions, as the resistor may get very hot). [3]
Circuit Setup
Before connecting an input supply to the board, consult the
circuit schematic and familiarize yourself with the various
connection options offered by the ISL6432EVAL1.
³ Set Switches
Ensure the ‘ATX ON’ (SW1) switch is in the off position
(away from ‘ATX ON’ marking) and ‘S3/S5’ (SW2) switch is
in the middle position (away from ‘S3’ or ‘S5’ marking).
SW3 helps with the control of the various outputs in ACPI
shutdown states. To avoid having the powerful output drives
(of the regulators that have to be off in certain sleep states)
hold the outputs within regulation, they have to be actively
kept off by pulling the corresponding FB pins above 1.25V.
1
September 2001
JP1 and JP3 select the on-board input voltage for the linear
pass elements corresponding to the VOUT3 and VOUT4
outputs, respectively. One recommended configuration for
initial evaluation is with JP1 populated in the ‘2.5VIN’
position and JP3 in the ‘3.3VIN’ position.
JP2 and JP4 select the ‘+3.3VDUAL’ as the input for the two
linear pass elements mentioned above. If an external
3.3VDUAL source is supplied, either pass element (Q4 and/or
Q5) may be powered from this source by moving the respective
header jumper from JP1 or JP3, onto JP2 or JP4, respectively.
³ Hookup Guide Using Standard Bench Supplies
Connect a 5V, 16A supply to the +5VDUAL input and a 3.3V,
4A, supply to the +3.3VIN input. Another 3.3V, 4A supply may
be needed for the optional +3.3VDUAL input if either JP2 or
JP4 are populated. Connect typical loads to all the evaluation
board’s outputs. Consult Table 1 for maximum loads
supported by the design of the in the configuration received;
consult the Modifications section for information on modifying
the evaluation board to meet your special needs.
³ Hookup Guide Using a Standard ATX Supply
Connect the 20-pin ATX 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 in the configuration received;
consult the Modifications section for information on
modifying the evaluation board to meet your special needs.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 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
Intel® and Pentium® are registered trademarks of Intel Corporation.
AMD® is a registered trademark of Advanced Micro Devices, Inc. Athlon™ is a trademark of Advanced Micro Devices, Inc.
AN9976
³ Hookup Guide for Piggy-Backing the Evaluation
Board Into Your System
Connect GND, +5VDUAL, +3.3VIN, and +3.3VDUAL turret
terminals to the corresponding voltages present on your
system board. For ACPI functionality, connect S3 IN (TP9)
and S5 IN (TP10) to your system’s S3 and S5 signal source.
Connect the evaluation board’s outputs to the corresponding
power planes in your system. Consult Table 1 for maximum
loads supported by the design of the in the configuration
received; consult the Modifications section for information on
modifying the evaluation board to meet your special needs.
Reference Design
General
The evaluation board is built on 1-ounce, 4-layer, printed circuit
board (see last three pages of this application note 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.).
Design Envelope
Operation
³ Provide Power to the Board
Turn on the bench supplies or the system onto which the
board is piggy-backed.
If using an ATX supply, plug it into the mains. If the supply
has an AC switch, turn it on. The ‘5VSB’, ‘5VDUAL’, and ‘S0’
LEDs should light up, indicating the presence of 5V standby
and 5V dual voltages on board, as well as indicating active
state selection. Flip on the ‘ATX ON’ switch and shortly
thereafter ‘5VIN’ and ‘ATX PGOOD’ LEDs should light up
indicating the presence of main ATX 5V on board, as well as
the ATX PGOOD indication.
³ 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.
In either state (active or S3, S5) vary the output loads to
simulate computer loads typical of the specific operating
state the circuit is in. Observe the limitations of the circuit
while in S3 or S5 states: all output power, along with any
necessary operating bias current, is delivered from the ATX
supply’s 5VSB output.
³ Examine State Transitions
For subsequent transitions into/out of standby states, leave
the main ATX outputs enabled (SW1 on); the on-board
circuitry will automatically turn them off when entering a
standby state and re-enable them when transitioning back
into active state. To enter a standby state, flip SW2 to the
position indicating the desired standby state. The ‘S3’ LED
lights up to indicate S3 standby state, while S5 state is
indicated by illumination of the ‘S5’ LED. Active state
indication is performed by the ‘S0’ LED.
Although a real-life computer system application might have
different requirements, the ISL6432EVAL1 board was
designed to meet the maximum output loading described in
Table 1. Note the fact that the sleep state output currents are
likely limited only by the ATX power supply’s 5VSB output
capability. As all the outputs operate the same current paths
in both active and standby states, standby state power
dissipation capability equals that of active state. Dynamic
output tolerances and current ratings can be adjusted by
properly selecting the components external to the ISL6432.
TABLE 1. ISL6432EVAL1 MAXIMUM OUTPUT LOADING
ACTIVE STATE
SLEEP STATES
IOUT
dIOUT/dt
IOUT
2.5VMEM
8.0A(pk)
3.0A(avg)
1A/µs
0.2A
(Note)
0.1A/µs
(Note)
3% / 5%
2.5VCLK
1.0A(pk)
0.4A(avg)
0.1A/µs
OFF
OFF
5% / 5%
1.8VMCH
3.0A(pk)
1.0A(avg)
1A/µs
0.1A
0.1A/µs
5% / 5%
1.5VAGP
3.0A(pk)
0.8A(avg)
1A/µs
OFF
OFF
5% / 5%
OUTPUT
VOLTAGE
TOL.
(STATIC/
dIOUT/dt DYNAMIC)
NOTE: In real applications, this output is OFF in S4/S5; requires
1.8VMCH to derive power from the 3.3VDUAL supply (not provided on
the ISL6432EVAL1).
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.
Performance
Figures 2 through 8 depict the evaluation board’s
performance during typical operational situations. To
simulate minimum loading conditions, unless otherwise
specified, the outputs were loaded with 65Ω resistive loads.
Soft-Start Start-Up
Fault Handling
In case of a fault condition (output undervoltage on the linear
outputs, or overcurrent on the switching output), the faulting
output shuts down and undergoes an individual re-start
attempt every three soft-start (SS) intervals. Review the
appropriate data sheet section for more detail.
2
Figure 2 shows a typical ISL6432EVAL1 start-up. For this
capture, the ATX supply powering the board is turned on, at
time t0, with SW1 on and SW2 is in the S0 (middle) position.
At time t1 the input supply exceeds the power-on-reset
(POR) threshold and the 2.5VMEM and 1.8VMCH outputs
start ramping up toward their target value, which they reach
AN9976
at time t2. Between t1 and t2, due to the fact the ATX 3.3V
output has not come up already, the 2.5VCLK and 1.5VAGP
outputs experience an undervoltage event which keeps them
off for a period of three soft-start cycles. At time t3, the main
ATX outputs start to ramp up. Time t4 signals the beginning
of the 2.5VCLK and 1.5VAGP soft starts, with the outputs
reaching their set point at time t5.
Standby to Active State Transition (S3 -> S0)
Figure 4 shows the reversal of the process described in
Figure 3. By flipping SW2 back to the S0 (middle) position at
time t0, the ATX supply’s main outputs are enabled, along
with the ISL6432-controlled 2.5VCLK and 1.5VAGP outputs.
Time t1 signals the return of the ATX PGOOD signal back to
a high state. Noteworthy is the lack of perturbations in the
2.5VMEM and 1.8VMCH outputs during this state transition.
+5VDUAL
ATX PGOOD
2.5VMEM
2.5VCLK
1.8VMCH
+3.3VIN
1.00V/DIV.
1.00V/DIV.
+3.3VIN
2.5VMEM
1.5VAGP
1.8VMCH
1.5VAGP
GND >
5ms/DIV.
t0
t1
t2
GND >
t3
t4
2.5VCLK
t5
FIGURE 2. ISL6432EVAL1 START-UP
Figure 3 shows a typical active (S0) to S3 standby state
transition. Prior to time t0, the ISL6432EVAL1 was operating
in active state. At time t0, SW2 is switched into the ‘S3’
position. As a result, the main ATX outputs, as well as the
2.5VCLK and 1.5VAGP outputs are shut down. Even though
the ATX is effectively shut down at time t0, the ATX PGOOD
output signals the fact that the main outputs will go out of
regulation only at time t1. At time t2, the ATX 3.3V outputs
start to discharge, falling out of regulation. Throughout the
transition, the 2.5VMEM and 1.8VMCH outputs rigorously
maintain their regulation.
ATX PGOOD
+3.3VIN
1.00V/DIV.
t1
t0
Active to Standby State Transition (S0 -> S3)
FIGURE 4. S3 STANDBY TO ACTIVE STATE TRANSITION
Due to the similar transition response, only S3 state
transitions are detailed.
Transient Response
Figure 5 details the transient response of all four outputs
controlled by the ISL6432 under the effect of concurrent
loading. The characteristics of the loads the outputs were
subject to during this test are listed in Table 2. To summarize
the information: all outputs were transiently loaded with 10%
to 100% of their maximum output rating, were under nominal
current rate of change, a 40% duty cycle, and different
frequencies resulting in random load overlapping. The test
was designed to stress the application in a manner
representative of a worst-case situation. Even under such
loading, the ISL6432EVAL1 exhibits exemplary response
and crosstalk immunity, both characteristics easily noticed in
Figure 5.
TABLE 2. OUTPUT TRANSIENT LOADING DESCRIPTION
2.5VMEM
IOUT(MIN)
(A)
IOUT(MAX)
(A)
dIOUT/dt
(A/µs)
Frequency
(Hz)
2.5VMEM
0.8
8.0
1.0
1000
2.5VCLK
0.1
1.0
0.1
800
1.8VMCH
0.3
3.0
1.0
650
1.5VAGP
0.3
3.0
1.0
1500
OUTPUT
1.8VMCH
1.5VAGP
GND >
100ms/DIV.
2.5VCLK
100ms/DIV.
t0
t1
t2
FIGURE 3. ACTIVE TO S3 STANDBY STATE TRANSITION
3
NOTE: All transients applied had a 40% duty cycle.
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2.5VMEM
2.5V>
2.5VCLK
50mV/DIV.
2.5V>
1.8VMCH
1.8V>
7 zooms out of the picture presented in Figure 6 in order to
detail the restart attempt under a continuous output shortcircuit. Time t0 marks the application of the output shortcircuit. At time t1, after approximately three soft-start intervals,
DRIVE4 attempts to restart the output: the output voltage,
and, consequently, the output current ramp up. As the output
current ramps up, the DRIVE4 pin enters current limiting, and
25% into the SS ramp undervoltage monitoring is enabled. At
time t2 the fault condition is detected and the output is shut
down. The cycle repeats for as long as the short-circuit is
present at the output.
1.5VAGP
1.5V>
+3.3VIN
200µs/DIV.
FIGURE 5. OUTPUT TRANSIENT RESPONSE
(CONCURRENT LOADING OF ALL OUTPUTS)
500mV/DIV.
DRIVE4
Output Short-Circuit Protection
In response to an overcurrent event on the switcher’s output, or
an undervoltage event on any of the linear outputs, the faulting
regulator is shut down. Figure 6 exemplifies such a scenario on
1.5VAGP (VOUT4). At time t0, a short-circuit is applied to the
1.5VAGP output; as a result, the output and the ATX 3.3V input
start to sag under the increasing output current. DRIVE4
responds by increasing the base drive for the pass element
(Q5). At time t1, DRIVE4 reaches its output current limit. The
ATX 3.3V output reflects the current limit event through the
settling of the voltage seen between times t1 and t2. As the
current drawn in current limiting from the ATX supply does not
equal the output current drawn by the short-circuit, the
1.5VAGP output continues to drop. At time t2, the 70%
undervoltage threshold is reached and the output is shut down.
1.5VAGP
IOUT1.5VAGPNOTE
GND >
NOTE - 5A/DIV.
5ms/DIV.
t0
t1
t2
FIGURE 7. ISL6432EVAL1 VOUT4 HICCUP MODE UNDER
APPLIED SHORT CIRCUIT
Switching Regulator Efficiency
Figure 8 highlights the evaluation board’s conversion
efficiency with only the switching section loaded. The
measurement was performed at room temperature with the
linear outputs open and 100 LFM of air flow.
+3.3VIN
90
89
DRIVE4
1.5VAGP
IOUT1.5VAGP NOTE
EFFICIENCY (%)
0.5V/DIV.
88
87
86
85
84
83
82
GND >
NOTE - 5A/DIV.
t0
t1
20µs/DIV.
81
80
0
1
2
3
4
5
6
7
8
9
OUTPUT CURRENT (A)
t2
FIGURE 6. ISL6432EVAL1 VOUT4 UNDERVOLTAGE
RESPONSE (SHORT-CIRCUIT PROTECTION)
Following an overcurrent shutdown, a restart attempt is
performed after approximately three soft-start periods. Figure
4
FIGURE 8. ISL6432EVAL1 SWITCHING REGULATOR
MEASURED EFFICIENCY (ALL LINEAR
OUTPUTS UNLOADED)
10
11
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Modifications
Adjusting the Output Voltage
All outputs controlled by the ISL6432 are adjustable by
means of the resistive divider connecting the FB pins to their
respective outputs.
The switching regulator’s output has provisions for droop
implementation, unused in the shipping configuration. As
R8’s value plays in the feedback compensation, it is
recommended VOUT1 is adjusted by adjusting R13 only.
If adjusting the output voltage of the linear regulators, please
pay attention to the recommended resistor value selection
guidelines described in the datasheet.
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.
High dv/dtdv/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 surface-mount tantalum capacitors), and/or the addition
of more ceramic capacitors, which have inherently low
ESR/ESL.
5
The addition of more input-side capacitance and decreasing
the input-side capacitor banks’ ESR can also help in
situations where the input-side ripple is affecting the output
regulation. Such an example is excessive ATX 3.3V ripple
reducing the collector-to-emitter voltage available for Q3
(2.5V output setting), and thus inducing an output droop
component. In such instance, the addition of input-side
capacitance and reduction of the ESR component can
reduce the output excursion.
Conclusion
The ISL6432EVAL1 evaluation board showcases a highly
integrated approach to providing peripheral power control in
Pentium 4 computer systems. Sophisticated internal circuits
facilitate ACPI implementation with minimum effort and a
reduced number of external components.
References
For Intersil documents available on the internet, see web site
www.intersil.com/
[1] FN9019 Data Sheet, (www.intersil.com/).
[2] Advanced Configuration and Power Interface (ACPI)
Specification, Revision 1.0, December 1996,
Intel/Microsoft/Toshiba.
(http://www.teleport.com/~acpi/).
[3] ATX Specification, Version 2.02, October 1998, Intel
Corporation (http://www.teleport.com/~atx/).
AN9976
ISL6432EVAL1 Schematic
L1
F1
+5VDUAL
1.2µH
10A
C1-3
3x1200µF
GND
+
C4
10µF
C5
1µF
C7
1µF
C6
1000pF
VCC
+3.3VIN
11
TP2
‘2.5VCLK’
+2.5V
VOUT3
+1.8V
R2
FB2
12.7kΩ
+
C9
1µF
TP3
‘1.8VMCH’
DRIVE2
Q3
FZT649
VOUT2
C10
330µF
R6
C18
1µF
+
FB3
9.09kΩ
C19
1000µF
7
1
8
2
6
R3
5.90kΩ
DRIVE3
Q4
2SD1802
R1
12
VOUT4
+1.5V
UGATE
C8
0.47µF
TP1
‘2.5VMEM’
L2
U1
10
ISL6432
9
+2.5V
C11-14
4x1000µF
LGATE
16
3
DRIVE4
R11
7.50kΩ
+
FB4
PGND
FB
R5
R8
0Ω
1.50kΩ
C20
10pF
COMP
13
C22
14
22nF 45.3kΩ
R12
8.45kΩ
JP1
‘3.3VIN’
JP3
‘OUT3 REGULATOR
INPUT VOLTAGE’
JP2
5
R9
‘3.3VIN’
‘3.3VDUAL’ JP4
‘2.5VIN’
‘OUT4 REGULATOR
INPUT VOLTAGE’
‘3.3VDUAL’
6
R10
R13
698Ω
GND
TP5
‘COMP’
‘2.5VIN’
+
R4
SPARE
Q1,2
2 x HUF76129D3S
R7
7.15kΩ
VOUT1
PHASE
15
C24
1000µF
‘+3.3VDUAL’
BOOT
C17
SPARE
C21
SPARE SPARE
Q5
2SD1802
C23
1µF
+3.3VIN
12kΩ
2.5µH
4
TP4
‘1.5VAGP’
OCSET
D1
MA732
C15,16
2x1µF
AN9976
ISL6432EVAL1 Schematic
(Continued)
‘+5VDUAL’
+5VIN
4, 6, 19, 20
ATX CONNECTOR
J1
HUF76145S3S
+5VDUAL
Q6
+12VIN
10
TP6
‘ATX 12V’
+3.3VIN
1, 2, 11
+3.3VIN
Q7
ITF86172SK8
+5VSB
9
+5VSB
RN1
4x1kΩ
PGOOD
8
+
C25
1000µF +
C26
1000µF
‘+3.3VIN’
PS_ON
14
3, 5, 7, 13,
15, 16, 17
QA1
ZDM4206
RN2
4x680Ω
GND
C27
0.1µF
R14
30Ω
Q10
2N7002
LP1
‘ATX PGOOD’
SW1
‘ATX ON’
TP7
‘ATX PGOOD’
‘GND’
‘GND’
BSS84ZX
+5VSB
Q8
C29
0.1µF
C28
0.1µF
U2
NC7S00
U3
NC7S08
‘S5 SLEEP’
U4
SW2A
R15
510Ω
LP4
‘5VDUAL’
LP3
‘5VIN’
TP8
‘12V ATX PGOOD DRIVE’
RN3
2x10kΩ
‘S3 SLEEP’
LP2
‘5VSB’
LP5
R16
U6
NC7S04
U5
NC7S04
NC7S08
TO
5VSB
RN4
2x10kΩ
TP9
680Ω
‘S3 IN’
‘S0’
LP6
‘S3’
TP10
‘S5 IN’
LP7
‘S5’
8
5
4
1
SW3
GH1008
RN5
2x680Ω
‘S3 SLEEP’
‘S5 SLEEP’
SW2B
TO OCSET
DA1-3
MA121CT
Q9
2N7002
TO: FB4
7
R17
10kΩ
FB3
FB2
AN9976ISL6432
Bill of Materials for ISL6432EVAL1
REFERENCE
PART NUMBER
DESCRIPTION
PACKAGE
MANUF. OR
VENDOR
QTY
C1-3
EEUFC0J122
Al. Electrolytic Capacitor, 6.3V, 1200µF
10 x 16
Panasonic
C4
TAJB106M006R
Tantalum Capacitor, 6.3V, 10µF
3.0 x 4.0
AVX
2
1
C5, 7, 9, 15, 16, 18,
23
1µF Ceramic
Ceramic Capacitor, Y5V, 16V, 1.0µF
0805
Any
7
C6
1000pF Ceramic
Ceramic Capacitor, X7R, 25V
0603
Any
1
C8
0.47µF Ceramic
Ceramic Capacitor, X7R, 16V, 0.47µF
0805
Any
1
C10
6.3ZA330
Al. Electrolytic Capacitor, 6.3V, 330µF
8 x 11.5
Rubycon
1
C11-14, 19, 24
6.3ZA1000
Al. Electrolytic Capacitor, 6.3V, 1000µF
10 x 16
Rubycon
6
C20
10pF Ceramic
Ceramic Capacitor, X7R, 50V
0603
Any
1
C22
22nF Ceramic
Ceramic Capacitor, X7R, 25V
0603
Any
1
C25, 26
6MV1000CA
Al. Electrolytic Capacitor, 6.3V, 1000µF
8 x 11.5
Sanyo
2
C27-29
0603YC104MAT2A
Ceramic Capacitor, X7R, 16V, 0.1µF
0603
AVX
3
C17, 21
Spare
D1
MA732CT-ND
Schottky Diode, 30V, 30mA
Mini 2P
Digikey
1
DA1-3
MA121CT-ND
Diode Array, 80V, 100mA
Mini 6P
Digikey
3
F1
4182100000
Fuse, 75V, 10A
2.5 x 6.0
J1
39-29-9203
20-pin Mini-Fit, Jr.™ Header Connector
JP1-4
68000-236
Jumper Header
71363-102
L1
1.2µH Inductor
L2
0805
Wickmann
1
Molex
1
0.1in. spacing
Berg
10/36
Jumper Shunt
0.1in. spacing
Berg
2
6 Turns of 16AWG onT44-52 Core
8 x 15
Any
1
2.5µH Inductor
8 Turns of 16AWG on T50-52B Core
10 x 17
Any
1
LP1-7
L63111CT-ND
Miniature LED, Through-Board Indicator
Digikey
7
Q1,2
HUF76129D3S
UltraFET MOSFET, 30V, 16mΩ
TO-252AA
Fairchild
2
Q3
FZT649
NPN Bipolar, 25V, 3A
SOT-223
Zetex
1
Q4,5
2SD1802
NPN Bipolar, 50V, 3A
TO-252AA
Sanyo
2
Q6
HUF76145S3S
UltraFET MOSFET, 30V, 5.5mΩ
TO-263
Fairchild
1
Q7
ITF86172SK8T
TrenchFET MOSFET, 30V, 23mΩ
SO-8
Siliconix
1
Q8
BSS84ZXCT-ND
Logic P-MOSFET, 50V, 10Ω
SOT-23
Digikey
1
Q9, 10
2N7002
Logic N-MOSFET, 25V, 5Ω
SOT-23
Any
2
QA1
ZDM4206NCT-ND
Small-Signal Dual MOSFET, 60V, 1Ω
SM-8
Digikey
1
R1
12kΩ
Resistor, 5%, 0.1W
0603
Any
1
R2
12.7kΩ
Resistor, 1%, 0.1W
0603
Any
1
R3
5.90kΩ
Resistor, 1%, 0.1W
0603
Any
1
R5
0Ω
Shorting Resistor
0603
Any
1
R6
9.09kΩ
Resistor, 1%, 0.1W
0603
Any
1
R7
7.15kΩ
Resistor, 1%, 0.1W
0603
Any
1
R8
1.50kΩ
Resistor, 1%, 0.1W
0603
Any
1
R10
45.3kΩ
Resistor, 1%, 0.1W
0603
Any
1
R11
7.50kΩ
Resistor, 1%, 0.1W
0603
Any
1
R12
8.45kΩ
Resistor, 1%, 0.1W
0603
Any
1
R13
698Ω
Resistor, 1%, 0.1W
0603
Any
1
R14
30Ω
Resistor, 5%, 0.1W
0603
Any
1
R15
510Ω
Resistor, 5%, 0.1W
0603
Any
1
R16
680Ω
Resistor, 5%, 0.1W
0603
Any
1
R17
10kΩ
Resistor, 5%, 0.1W
0603
Any
1
R4,9
Spare
RN1
Y9102CT-ND
Digikey
1
0603
8
4-Resistor Network, 1.0kΩ, 5%, 0.1W
3.2 x 1.6
Mini-Fit, Jr.™ is a trademark of Molex, Inc.
AN9976
Bill of Materials for ISL6432EVAL1
REFERENCE
RN2
PART NUMBER
Y9681CT-ND
DESCRIPTION
4-Resistor Network, 680Ω, 5%, 0.1W
PACKAGE
3.2 x 1.6
MANUF. OR
VENDOR
Digikey
QTY
1
RN3,4
Y8103CT-ND
2-Resistor Network, 10kΩ, 5%, 0.1W
1.6 x 1.6
Digikey
2
RN5
Y8681CT-ND
2-Resistor Network, 680Ω, 5%, 0.1W
1.6 x 1.6
Digikey
1
SW1
GT12MSCKE
Miniature Switch, Single Pole, Single Throw
C&K
1
SW2
GT23MSCKE
Miniature Switch, Double Pole, Double Throw,
On-Off-On
C&K
1
SW3
GH1008-ND
Miniature Rocker Switch, 8-Pole, Single Throw
Digikey
1
TP1-4
1314353-00
Test Point, Scope Probe
Tektronics
4
TP5-10
SPCJ-123-01
Test Point
Jolo
6
U1
ISL6432CB
Synchronous Switcher and Triple Linear
Controller
SOIC-16
Intersil
1
U2
NC7S00
2-Input NAND Gate
5-Pin SOT-23
Fairchild
1
U3, 4
NC7S08
2-Input AND Gate
5-Pin SOT-23
Fairchild
2
5-Pin SOT-23
U5, 6
NC7S04
CMOS Inverter
+3.3VDUAL ,
+3.3VIN , +5VDUAL ,
+VOUT1, +VOUT2,
+VOUT3, +VOUT4,
GND
1514-2
Terminal Post
NOTE:
1. Mount SW1 such that the side with the part marking faces the white dot in the solder mask.
ISL6432EVAL1 Layout
TOP SILK SCREEN
9
Fairchild
2
Keystone
14
AN9976
ISL6432EVAL1 Layout
(Continued)
TOP LAYER
GROUND LAYER
10
AN9976
ISL6432EVAL1 Layout
(Continued)
POWER LAYER
BOTTOM LAYER
11
AN9976
ISL6432EVAL1 Layout
(Continued)
BOTTOM SILK SCREEN
All Intersil 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 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
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Intersil Corporation
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12
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