ISL6523EVAL1

Manufacturer Part NumberISL6523EVAL1
DescriptionEVALUATION BOARD VRM8.5 ISL6523
ManufacturerIntersil
ISL6523EVAL1 datasheet
 


Specifications of ISL6523EVAL1

Main PurposeSpecial Purpose DC/DC, VRM SupplyOutputs And Type4, Non-Isolated
Voltage - Output1.05 ~ 1.825V, 1.2V, 1.5V, 1.8VCurrent - Output14A, 4A, 1A, 1A
Voltage - Input3.3V, 5V, 12VRegulator TopologyBuck
Frequency - Switching200kHzBoard TypeFully Populated
Utilized Ic / PartISL6523Lead Free Status / RoHS StatusContains lead / RoHS non-compliant
Power - Output-  
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Data Sheet
VRM8.5 Dual PWM and Dual Linear Power
System Controller
The ISL6523 provides the power control and protection for
four output voltages in high-performance microprocessor
and computer applications. The IC integrates two PWM
controllers and two linear controllers, as well as the
monitoring and protection functions into a 28-pin SOIC
package. One PWM controller regulates the microprocessor
core voltage with a synchronous-rectified buck converter.
The second PWM controller supplies the computer system’s
AGTL+ 1.2V bus power with a standard buck converter. The
linear controllers regulate power for the 1.5V AGP bus and
the 1.8V power for the chipset core voltage and/or cache
memory circuits.
The ISL6523 includes an Intel VRM8.5 compatible, TTL 5-
input digital-to-analog converter (DAC) that adjusts the
microprocessor core-targeted PWM output voltage from
1.050V to 1.825V in 25mV steps. The precision reference
and voltage-mode control provide ±1% static regulation. The
second PWM controller’s output provides a voltage level of
1.2V with ±3% accuracy. The linear regulators use external
N-channel MOSFETs or bipolar NPN pass transistors to
provide fixed output voltages of 1.5V ±3% (V
±3% (V
).
OUT4
The ISL6523 monitors all the output voltages. A delayed-
rising VTT (standard buck output) Power Good signal is
issued before the core PWM starts to ramp up. Another
system Power Good signal is issued when the core is within
±10% of the DAC setting and all other outputs are above
their under- voltage levels. Additional built-in overvoltage
protection for the core output uses the lower MOSFET to
prevent output voltages above 115% of the DAC setting. The
PWM controllers’ overcurrent function monitors the output
current by using the voltage drop across the upper
MOSFET’s r
, eliminating the need for a current
DS(ON)
sensing resistor.
Ordering Information
TEMP.
o
PART NUMBER
RANGE (
C)
PACKAGE
ISL6523CB
0 to 70
28 Ld SOIC
ISL6523CBZ
0 to 70
28 Ld SOIC
(See Note)
(Pb-free)
ISL6523EVAL1
Evaluation Board
*Add “-T” suffix to part number for tape and reel packaging.
NOTE: Intersil Pb-free products employ special Pb-free material sets; molding
compounds/die attach materials and 100% matte tin plate termination finish, which
is 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-020B.
1
Features
• Provides 4 Regulated Voltages
- Microprocessor Core, AGTL+ Bus, AGP Bus Power, and
North/South Bridge Core
• Drives N-Channel MOSFETs
• Linear Regulator Drives Compatible with both MOSFET
and Bipolar Series Pass Transistors
• Simple Single-Loop Control Designs
- Voltage-Mode PWM Control
• Fast PWM Converter Transient Response
- High-Bandwidth Error Amplifiers
- Full 0% to 100% Duty Ratios
• Excellent Output Voltage Regulation
- Core PWM Output . . . . . . . . . . ±1% Over Temperature
- All Other Outputs . . . . . . . . . . . . . ±3% Over Temperature
• VRM8.5 TTL-Compatible 5-Bit DAC Microprocessor Core
Output Voltage Selection
- Wide Range . . . . . . . . . . . . . . . . . . . . 1.050V to 1.825V
• Power-Good Output Voltage Monitors
- Separate delayed VTT Power Good
• Overcurrent Fault Monitors
- Switching Regulators Do Not Require Extra Current
) and 1.8V
OUT3
Sensing Elements, Use MOSFET’s r
• Small Converter Size
- Constant Frequency Operation
- 200kHz Internal Oscillator
• Pb-free available
Applications
• Motherboard Power Regulation for Computers
Pinout
UGATE2
PHASE2
PKG.
DWG. #
M28.3
M28.3
OCSET2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
Copyright © Intersil Americas Inc. 2001-2002, 2004. All Rights Reserved
ISL6523
July 2004
FN9024.2
DS(ON)
ISL6523 (SOIC)
TOP VIEW
1
28
VCC
2
27
UGATE1
VID3
3
26
PHASE1
25
LGATE1
VID2
4
VID1
5
24
PGND
VID0
6
23
OCSET1
22
VSEN1
VID25
7
PGOOD
8
21
FB1
VTTPG
9
20
COMP1
19
VSEN3
10
VSEN2
11
18
DRIVE3
SS24
12
17
GND
SS13
13
16
VAUX
VSEN4
14
15
DRIVE4
|
Intersil (and design) is a trademark of Intersil Americas Inc.

ISL6523EVAL1 Summary of contents

  • Page 1

    ... ISL6523CBZ SOIC (See Note) (Pb-free) ISL6523EVAL1 Evaluation Board *Add “-T” suffix to part number for tape and reel packaging. NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which is 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-020B ...

  • Page 2

    VSEN3 VAUX 1.5V EA3 - DRIVE3 + x0.75 x0.75 + DRIVE4 - EA4 + VSEN4 1.8V - VCC DRIVE2 UGATE2 + - PHASE2 INHIBIT PWM GATE COMP2 CONTROL - + PWM2 - VSEN2 + EA2 UV2 - + x0.90 + ...

  • Page 3

    IN V OUT2 +3. OUT3 +12V IN + OUT2 V OUT2 1.2V C OUT2 CR2 VTT POWERGOOD +3. OUT3 1.5V C OUT3 Q5 V OUT4 1.8V ...

  • Page 4

    Absolute Maximum Ratings Supply Voltage .+15V CC ...

  • Page 5

    Electrical Specifications Recommended Operating Conditions, Unless Otherwise Noted. Refer to Figures 1, 2 and 3 (Continued) PARAMETER UGATE1,2 Sink LGATE Source LGATE Sink PROTECTION OCSET1,2 Current Source Soft-Start Current POWER GOOD VSEN1 Upper Threshold (VSEN1/DACOUT) VSEN1 Under-Voltage (VSEN1/DACOUT) VSEN1 Hysteresis ...

  • Page 6

    PGOOD (Pin 8) PGOOD is an open collector output used to indicate the status of the output voltages. This pin is pulled low when the synchronous regulator output is not within ±10% of the DACOUT reference voltage or when any ...

  • Page 7

    The POR function initiates soft-start operation after all supply voltages exceed their POR thresholds. Soft-Start The 1.8V supply designed to power the chipset (OUT4), cannot lag the ATX 3.3V by more than 2V, at any time. To meet ...

  • Page 8

    SS13UP UV3 OC LATCH S Q OC1 R COUNTER 4V R SS13 0.8V SS24 SS24UP POR 4V OV UV4 R OC2 LATCH FIGURE ...

  • Page 9

    Determine I for I > I PEAK PEAK OUT(MAX) where ∆I is the output inductor ripple current. For an equation for the ripple current see the section under component guidelines titled ‘Output Inductor Selection’. OVERCURRENT TRIP: V > V ...

  • Page 10

    Layout Considerations MOSFETs switch very fast and efficiently. The speed with which the current transitions from one device to another causes voltage spikes across the interconnecting impedances and parasitic circuit elements. The voltage spikes can degrade efficiency, radiate noise into ...

  • Page 11

    Figure 10 highlights the voltage-mode control loop for a synchronous-rectified buck converter. The output voltage ( regulated to the Reference voltage level. The OUT reference voltage level is the DAC output voltage (DACOUT) for PWM1. The error amplifier ...

  • Page 12

    ESR of the output capacitor bank, as shown in the following equation: ESR OUT L = ------------------------------------------------ ( ) OUT MIN × π × 2 where L - minimum output inductor value at full output OUT(MIN) ...

  • Page 13

    Minimizing the response time can minimize the output capacitance required. The response time to a transient is different for the application of load and the removal of load. The following ...

  • Page 14

    OR LESS +12V VCC ISL6523 Q1 UGATE PHASE - LGATE Q2 + PGND GND FIGURE 12. UPPER GATE DRIVE - DIRECT V The power dissipation in PWM2 converter is similar to PWM1 except that the power losses of the ...

  • Page 15

    ... ISL6523 memory controller hub voltage (V and +12VDC. For detailed information on the circuit, including a Bill-of-Materials and circuit board description, see Application Note AN9925. Also see the Intersil web page (www.intersil.com) for the latest information. ), the AGP OUT1 ), and the OUT3 L1 1µ ...

  • Page 16

    ... 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 ...