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Part: ISL6244EVAL1
Category:
Power Management
-> PWM Controllers
Description: PWM Controller, Multiphase Power Controller With 2, 3, or 4 Phase For Amd Mobile Hammer <<<>>> <<<>>>The ISL6244 Provides Core-voltage Regulation BY Driving 2 to 4 Interleaved Synchronous-rectified Buck-converter Channels in Parallel. Interleaving The Channel Timing Results in Increased Ripple Frequency Which Reduces Input And Output Ripple Currents. The Reduction in Ripple Results in Lower Component Cost, Reduced Dissipation, And a Smaller Implementation Area.
Company: Intersil Corporation
Datasheet: Download ISL6244EVAL1 datasheet File size : 765 kB
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Datasheet text preview:
®
ISL6244
D a ta Sheet F eb r u ar y 2004 FN9106.2
Multi-Phase PWM Controller
The ISL6244 provides core-voltage regulation by driving 2 to 4 interleaved synchronous-rectified buck-converter channels in parallel. Interleaving the channel timing results in increased ripple frequency which reduces input and output ripple currents. The reduction in ripple results in lower component cost, reduced dissipation, and a smaller implementation area. The ISL6244 uses cost and space-saving rDS(ON) sensing for channel current balance, active voltage positioning, and over-current protection. Output voltage is monitored by an internal differential remote sense amplifier. A high-bandwidth error amplifier drives the output voltage to match the programmed 5-bit DAC reference voltage. The resulting compensation signal guides the creation of pulse width modulated (PWM) signals to control companion Intersil MOSFET drivers. The OFS pin allows direct offset of the DAC voltage from 0V to 100mV using a single external resistor. The entire system is trimmed to ensure a system accuracy of ± 1% . Outstanding features of this controller IC include Dynamic VIDTM technology allowing seamless on-the-fly VID changing without the need of any external components. Battery "feed-forward" is provided to allow for traditional control schemes over total input voltage variation. Output voltage "droop" or active voltage positioning is optional. When employed, it allows the reduction in size and cost of the output capacitors required to support load transients. A threshold-sensitive enable input allows the use of an external resistor divider for start-up coordination with Intersil MOSFET drivers or any other devices powered from a separate supply. Superior over-voltage protection is achieved by gating on the lower MOSFET of all phases to reduce the output voltage. Under-voltage conditions are detected, but PWM operation is not disrupted. Over-current conditions cause a hiccupmode response as the controller repeatedly tries to restart. After a set number of failed startup attempts, the controller latches off. A power good logic signal indicates when the converter output is between the UV and OV thresholds.
Features
· Multi-Phase Power Conversion - 2, 3 or 4 Phase Operation · Active Channel Current Balancing · Precision rDS(ON) Current Sharing - Lossless - Low Cost · Precision CORE Voltage Regulation - Differential Remote Output Voltage Sensing - Programmable Reference Offset - ± 1% System Accuracy · Microprocessor Voltage Identification Input - 5-Bit VID Input - 0.800V to 1.550V in 25mV Steps - Dynamic VID Technology · Programmable Droop Voltage · Excellent Dynamic Response - Combined Input Voltage Feed-Forward and Pulse-byPulse Average Current Mode · Over Current Protection · Digital Soft Start · Threshold Sensitive Enable Input · High Ripple Frequency (160kHz to 4MHz) · Lead-free Product Now Available Suffix (Z) · QFN Package: - Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Package Outline - Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profile
Applications
· AMD Hammer Family Processor Voltage Regulator · Low Output Voltage, High Current DC-DC Converters · Voltage Regulator Modules
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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 registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2004 All Rights Reserved. Dynamic VIDTM is a trademark of Intersil Americas Inc. All other trademarks mentioned are the property of their respective owners.
ISL6244 Ordering Information
PART NUMBER TEMP. (°C) ISL6244CR ISL6244 CRZ (Note 1) ISL6244HR ISL6244 HRZ (Note 1) NOTES: 1. Intersil Lead-Free products employ special lead-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which is compatible with both SnPb and leadfree soldering operations. Intersil Lead-Free products are MSL classified at lead-free peak reflow temperatures that meet or exceed the lead-free requirements of IPC/JEDEC J Std-020B. 2. Add "-T" suffix for 32 QFN 5x5 Tape and Reel packages. 0 to 70 0 to 70 PACKAGE 32 Ld 5x5 QFN 32 Ld 5x5 QFN (Lead-Free) PKG. DWG. # L32.5x5 L32.5x5
VID3 VFF GND VID4 NC EN
Pinout
ISL62 44CR (32 LEAD QFN 5x5) TOP VIEW
PGOOD 25 24 PWM4 23 ISEN4 22 ISEN1 21 PWM1 20 PWM2 19 GND 18 ISEN2 17 ISEN3 9 IOUT 10 VDIFF 11 VSEN 12 RGND 13 GND 14 GND 15 VCC 16 PWM3
-10 to 100 32 Ld 5x5 QFN -10 to 100 32 Ld 5x5 QFN (Lead-Free)
L32.5x5 L32.5x5
VID2 VID1 VID0 NC OFS COMP FB NC 1 2 3 4 5 6 7 8
32
31
30
29
28
27
26
NC = NO CONNECT
2
FS
ISL6244
Absolute Maximum Ratings
Supply Voltage, VCC (Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . .+7V Input, Output, or I/O Voltage . . . . . . . . . . GND -0.3V to VCC + 0.3V ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class II
Thermal Information
Thermal Resistance JA (°C/W) JC (°C/W) QFN Package (Notes 3, 5). . . . . . . . . . 32 4 Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 150°C Maximum Storage Temperature Range . . . . . . . . . . . -65°C to 150°C Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300°C
Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5V ±5% Ambient Temperature. . . . . . . . . . . . . . . . . . . . . . . . .-10°C to 100°C Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . 125°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.
NOTES: 3. For VCC > 5.5V, current must be limited to 25mA. 4. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with "direct attach" features. See Tech Brief TB379. 5. Tolerance does not include the VID offset error or any external component tolerances. 6. For JC, the "case temp" location is the center of the exposed metal pad on the package underside.
Electrical Specifications
PARAMETER VCC SUPPLY CURRENT Nominal Supply Shutdown Supply
Operating Conditions: VCC = 5V, TA = -10°C to 100°C. Unless Otherwise Specified. TEST CONDITIONS MIN TYP MAX UNITS
VCC = 5VDC; EN = 5VDC; RT = 100k ±1% VCC = 5VDC; EN = 0VDC; RT = 100k ±1%
8.0 8.0
10.8 10.3
14.0 13.0
mA mA
POWER-ON RESET AND ENABLE POR Threshold VCC Rising VCC Falling ENABLE Threshold EN Rising Hysteresis REFERENCE VOLTAGE AND DAC System Accuracy (Note 3) 0 to 70°C VID on Fly Step Size VID Pull Up VID Input Low Level VID Input High Level PIN-ADJUSTABLE OFFSET OFS Current Offset Accuracy ROFS = 5k ±1% ROFS = 5k ±1% , 0 to 70°C Maximum Offset OSCILLATOR Accuracy RT = 100K Adjustment Range VFF Range Max Duty Cycle -12.5 245 0.08 0.5 280 75 12.5 315 1. 0 2.5 % kHz MH z V % 92.0 94.0 100 100.0 100.0 108. 0 106. 0 100. 0 mV µA mV RT = 100k -1.2 -1 -30 2.0 25 -20 1.2 1 -10 0. 8 %VID %VID mV µA V V 4.25 3.75 1.21 5 82 4.35 3.85 1. 2 4 0 92 4.60 4.00 1.26 5 102 V V V mV
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