ISL6568CRZ Intersil Corporation, ISL6568CRZ Datasheet

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ISL6568CRZ

Manufacturer Part Number
ISL6568CRZ
Description
ISL6568CRZTwo-Phase Buck PWM Controller with Integrated MOSFET Drivers for VRM9, VRM10, and AMD Hammer Applications
Manufacturer
Intersil Corporation
Datasheet

Specifications of ISL6568CRZ

Dc
0618

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Two-Phase Buck PWM Controller with
Integrated MOSFET Drivers for VRM9,
VRM10, and AMD Hammer Applications
The ISL6568 two-phase PWM control IC provides a
precision voltage regulation system for advanced
microprocessors. The integration of power MOSFET drivers
into the controller IC marks a departure from the separate
PWM controller and driver configuration of previous multi-
phase product families. By reducing the number of external
parts, this integration is optimized for a cost and space
saving power management solution.
Outstanding features of this controller IC include
programmable VID codes compatible with Intel VRM9,VRM10,
as well as AMD Hammer microprocessors. A unity gain,
differential amplifier is provided for remote voltage sensing,
compensating for any potential difference between remote and
local grounds. The output voltage can also be positively or
negatively offset through the use of a single external resistor.
A unique feature of the ISL6568 is the combined use of both
DCR and r
positioning (droop) and overcurrent protection are
accomplished through continuous inductor DCR current
sensing, while r
channel-current balance. Using both methods of current
sampling utilizes the best advantages of each technique.
Protection features of this controller IC include a set of
sophisticated overvoltage, undervoltage, and overcurrent
protection. Overvoltage results in the converter turning the
lower MOSFETs ON to clamp the rising output voltage and
protect the microprocessor. The overcurrent protection level is
set through a single external resistor. Furthermore, the ISL6568
includes protection against an open circuit on the remote
sensing inputs. Combined, these features provide advanced
protection for the microprocessor and power system.
Ordering Information
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100% matte
tin plate termination finish, which are RoHS compliant and 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-020.
查询ISL6568CR供应商
ISL6568CR
ISL6568CRZ (Note)
ISL6568CRZA
(Note)
ISL6568IR
ISL6568IRZ (Note)
ISL6568IRZA (Note) -40 to 85 32 Ld 5x5 QFN (Pb-free
PART NUMBER*
DS(ON)
DS(ON)
current sensing. Load line voltage
-40 to 85 32 Ld 5x5 QFN
-40 to 85 32 Ld 5x5 QFN (Pb-free) L32.5x5
0 to 70 32 Ld 5x5 QFN
0 to 70 32 Ld 5x5 QFN (Pb-free) L32.5x5
0 to 70 32 Ld 5x5 QFN (Pb-free
TEMP.
(°C)
current sensing is used for accurate
®
with Anneal)
with Anneal)
1
PACKAGE
Data Sheet
L32.5x5
L32.5x5
L32.5x5
L32.5x5
DWG. #
PKG.
1-888-INTERSIL or 1-888-468-3774
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Features
• Integrated Multi-Phase Power Conversion
• Precision Core Voltage Regulation
• Precision Channel Current Sharing
• Accurate Load Line Programming
• Variable Gate Drive Bias: 5V to 12V
• Microprocessor Voltage Identification Inputs
• Overcurrent Protection
• Multi-tiered Overvoltage Protection
• Digital Soft-Start
• Selectable Operation Frequency up to 1.5MHz Per Phase
• Pb-Free Plus Anneal Available (RoHS Compliant)
Pinout
VID12.5
COMP
- 1 or 2-Phase Operation
- Differential Remote Voltage Sensing
- ±0.5% System Accuracy Over Temperature
- Adjustable Reference-Voltage Offset
- Uses Loss-Less r
- Uses Loss-Less Inductor DCR Current Sampling
- Up to a 6-Bit DAC
- Selectable between Intel’s VRM9, VRM10, or AMD
- Dynamic VID-on-the-fly Technology
VDIFF
RGND
VCC
REF
OFS
Hammer DAC codes
FB
All other trademarks mentioned are the property of their respective owners.
1
2
3
4
5
6
7
8
|
July 25, 2005
Intersil (and design) is a registered trademark of Intersil Americas Inc.
32
9
Copyright Intersil Americas Inc. 2004, 2005. All Rights Reserved
10
31
DS(ON)
11
30
ISL6568 (QFN)
TOP VIEW
12
29
GND
Current Sampling
33
13
28
14
27
15
26
ISL6568
16
25
FN9187.3
24
23
22
21
20
19
18
17
BOOT1
PHASE1
VID4
VID3
ENLL
PHASE2
BOOT2
UGATE2

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ISL6568CRZ Summary of contents

Page 1

... Ordering Information TEMP. PART NUMBER* (°C) PACKAGE ISL6568CR 5x5 QFN ISL6568CRZ (Note 5x5 QFN (Pb-free) L32.5x5 ISL6568CRZA 5x5 QFN (Pb-free (Note) with Anneal) ISL6568IR - 5x5 QFN ISL6568IRZ (Note) - 5x5 QFN (Pb-free) L32 ...

Page 2

Block Diagram ICOMP OCSET ISEN AMP ISUM IREF RGND VSEN x1 x1 VDIFF UVP OVP OVP V OVP +150mV x 0.82 VID4 VID3 DYNAMIC VID2 VID D/A VID1 VID0 VID12.5 REF E/A FB COMP OFS OFFSET 2 ISL6568 PGOOD 100µA ...

Page 3

Typical Application - ISL6568 FB VDIFF VSEN RGND +5V VCC OFS FS REF ISL6568 VID4 VID3 VID2 VID1 VID0 VID12.5 PGOOD +12V GND ENLL IREF OCSET ICOMP 3 ISL6568 ISL6568 COMP +12V PVCC1 BOOT1 UGATE1 PHASE1 ISEN1 LGATE1 +12V PVCC2 ...

Page 4

Typical Application - ISL6568 with NTC Thermal Compensation FB VDIFF VSEN RGND +5V VCC OFS FS REF ISL6568 VID4 VID3 VID2 VID1 VID0 VID12.5 PGOOD +12V GND ENLL IREF OCSET ICOMP 4 ISL6568 ISL6568 COMP +12V PVCC1 BOOT1 UGATE1 PHASE1 ...

Page 5

... VCC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5V ±5% PVCC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . +5V to 12V ±5% Ambient Temperature (ISL6568CR, ISL6568CRZ 0°C to 70°C Ambient Temperature (ISL6568IR, ISL6568IRZ .-40°C to 85°C CAUTION: Stress above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied ...

Page 6

Electrical Specifications Recommended Operating Conditions, Unless Otherwise Specified. (Continued) PARAMETER ERROR AMPLIFIER DC Gain (Note 3) Gain-Bandwidth Product (Note 3) Slew Rate (Note 3) Maximum Output Voltage Minimum Output Voltage OVERCURRENT PROTECTION OCSET trip current OCSET Accuracy ICOMP Offset PROTECTION ...

Page 7

Timing Diagram t PDHUGATE UGATE LGATE t FLGATE Simplified Power System Diagram +12V IN +5V IN 5-6 VID Functional Pin Description VCC VCC is the bias supply for the ICs small-signal circuitry. Connect this pin to a +5V supply and ...

Page 8

To encode the DAC with AMD Hammer VID codes, connect this pin to a +5V source through a 5kΩ resistor. VSEN and RGND VSEN and RGND are inputs to the precision differential remote-sense amplifier and should ...

Page 9

IL1 + IL2 + IL3, 7A/DIV IL3, 7A/DIV PWM3, 5V/DIV PWM2, 5V/DIV IL1, 7A/DIV PWM1, 5V/DIV 1µs/DIV FIGURE 1. PWM AND INDUCTOR-CURRENT WAVEFORMS FOR 3-PHASE CONVERTER Interleaving The switching of each channel in a multi-phase converter is timed to be ...

Page 10

FS pin and ground. Each cycle begins when the clock signal commands PWM1 to go low. The PWM1 transition signals the internal channel-1 MOSFET ...

Page 11

BOOT2 and PHASE2 pins, as described in the PWM Operation section ------------------------- - SEN L R ISEN I n SAMPLE & ISEN(n) HOLD - R + ...

Page 12

TABLE 3. VRM9 VOLTAGE IDENTIFICATION CODES (Continued) VID4 VID3 VID2 VID1 ...

Page 13

TABLE 4. VRM10 VOLTAGE IDENTIFICATION CODES (Continued) VID4 VID3 VID2 VID1 VID0 ...

Page 14

Load-Line (Droop) Regulation Some microprocessor manufacturers require a precisely- controlled output impedance. This dependence of output voltage on load current is often termed “droop” or “load line” regulation. As shown in Figure 6, a voltage, V DROOP total current in ...

Page 15

VDIFF + V R OFS FB VREF - FB I OFS OFS ISL6568 R OFS GND FIGURE 8. POSITIVE OFFSET OUTPUT VOLTAGE PROGRAMMING VDIFF - V R OFS FB VREF + FB I OFS VCC R OFS OFS ISL6568 FIGURE ...

Page 16

V 1   VID ---- - t = ----------------- - + 1.5   DVID f 0.0125 S Advanced ...

Page 17

ISL6568 INTERNAL CIRCUIT POR CIRCUIT ENABLE COMPARATOR + - 0.66V SOFT-START AND FAULT LOGIC FIGURE 11. POWER SEQUENCING USING THRESHOLD- SENSITIVE ENABLE (ENLL) FUNCTION 2. The voltage on ENLL must be above 0.66V. The EN input allows for power sequencing ...

Page 18

R OCSET ICOMP V - OCSET IREF + ISEN - - V DROOP ISUM + OC + VDIFF - +1V VID + 150mV SOFT-START, FAULT AND CONTROL LOGIC V OVP - OV VSEN + + RGND UV ...

Page 19

Equation 7. A constant 100µA flows through R , creating the OCSET voltage. When the droop OCSET voltage exceeds the OCSET voltage, the overcurrent protection circuitry activates. Since the droop voltage is proportional to the output current, ...

Page 20

Q , and the upper MOSFET r rr conduction loss. When the upper MOSFET turns off, the lower MOSFET does not conduct any portion of the inductor current until the voltage at the phase node falls below ground. ...

Page 21

PVCC HI2 LGATE LO2 GI2 G2 FIGURE 16. TYPICAL LOWER-GATE DRIVE TURN-ON PATH The total gate drive power losses are dissipated among the resistive components along the transition path and in the bootstrap ...

Page 22

Choosing the components for this current sense network is a two step process. First, R and C COMP chosen so that the time constant of this R network matches the time constant of the inductor L/DCR. Then the resistor R ...

Page 23

C (OPTIONAL COMP VDIFF FIGURE 20. COMPENSATION CONFIGURATION FOR LOAD-LINE REGULATED ISL6568 CIRCUIT Since the system poles and zero are affected by the values of the components that are meant to compensate ...

Page 24

Most capacitor solutions rely on a mixture of high frequency capacitors with relatively low capacitance in combination with bulk capacitors having high capacitance but limited high-frequency performance. Minimizing the ESL of the high-frequency capacitors allows them to support the output ...

Page 25

RMS current calculated. The voltage rating of the capacitors should also be at least 1.25 times greater than the maximum input voltage. Figure 23 provides the same input RMS current ...

Page 26

Extra care should be given to the LGATE traces in particular since keeping their impedance and inductance low helps to significantly reduce the ...

Page 27

VDIFF VSEN RGND +5V VCC (CF1) R OFS OFS FS REF REF ISL6568 VID4 VID3 VID2 VID1 VID0 VID12.5 PGOOD +12V GND ENLL IREF OCSET ICOMP R COMP ...

Page 28

... 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, software 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 ...

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