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Part: ISL6558CB
Category:
Power Management
-> Desktop
Description: Multi-purpose Precision Multi-phase PWM Controller With Optional Active Voltage Positioning
Company: Intersil Corporation
Datasheet: Download ISL6558CB datasheet File size : 476 kB
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Datasheet text preview:
®
ISL6558
D a ta Sheet Ju n e 2003 FN9027.5
Multi-Purpose Precision Multi-Phase PWM Controller With Optional Active Voltage Positioning
The ISL6558 is a multi-phase PWM controller, which in combination with the HIP6601B, HIP6602B, HIP6603B, or ISL6605 companion gate drivers form a complete solution for high-current, high slew-rate applications. The ISL6558 regulates output voltage, balances load currents and provides protective functions for two to four synchronous rectified buck converter channels.
TM
Features
· Multi-Phase Power Conversion - 2-, 3-, or 4-Phase Operation · Optional Output Voltage Droop · Precision Channel-Current Balance · Lossless Current Sensing · Precision Reference Voltage - 0.8V±1.5% Over -40oC-85oC Range - 0 . 8 V ± 1.0% Over 0oC-70oC Range · Fast Transient Response · Overcurrent and Overvoltage Protection · Digital Soft-start · Power Good Indication · High Ripple Frequency (80kHz to 1.5MHz) · QFN Package - Compliant to JEDEC PUB95 MO-220 QFN-Quad Flat No Leads-Product Outline - Near Chip-Scale Package Footprint; Improves PCB Efficiency and Thinner in Profile
A novel approach to current sensing is used to reduce overall solution cost and improve efficiency. The voltage developed across the lower MOSFET during conduction is sampled and fed back to the controller. This lossless current-sensing approach enables the controller to maintain phase-current balance between the power channels, provide overcurrent protection, and permit droop compensation. Optional output voltage "droop" or active voltage positioning is supported via the DROOP pin. Taking advantage of this feature reduces the size and cost of the output capacitors required to support a load transient. In the event of an overvoltage, the controller monitors and responds to reduce the risk of damage to load devices. Undervoltage conditions are indicated through a PGOOD transition. Overcurrent conditions cause the converter to shutdown limiting the exposure of load devices. These integrated monitoring and protection features provide a safe environment for microprocessors and other advanced low voltage circuits.
Applications
· Power Supply Control for Microprocessors · Low Output Voltage, High Current DC-DC Converters · Voltage Regulator Modules · Servers and Workstations · Memory and Accelerated Graphics Port Supplies · Communication Processor and Personal Computer Peripherals
Pinouts
ISL6558 (16 LEAD SOIC) TOP VIEW
VCC 1 PGOOD 2 COMP 3 DROOP 4 FB 5 VSEN 6 FS/EN 7 GND 8 16 PWM4 15 ISEN4 14 ISEN1 13 PWM1 12 PWM2 11 ISEN2 10 ISEN3 9 PWM3
Ordering Information
PART NUMBER ISL6558 CB ISL6558CB-T ISL6558CR ISL6558CR-T ISL6558 IB ISL6558IB-T ISL6558IR ISL6558IR-T ISL6558EVAL1 ISL6558EVAL2 TEMP. (oC) 0 to 70 PACKA GE 16 Ld SOIC PKG. DWG. # M16.15
16 Ld SOIC Tape and Reel 0 to 70 20 Ld 5x5 QFN L20.5X5
20 Ld QFN Tape and Reel -40 to 85 16 Ld SOIC M16.15
ISL6558 (20 LEAD 5X5 QFN) TOP VIEW
PGOOD PWM4 GND ISEN4 15 ISEN1 14 PWM1 13 PWM2 12 ISEN2 11 ISEN3 6 N/C 7 FS/EN 8 GND 9 10 PWM3 VCC VCC
16 Ld SOIC Tape and Reel -40 to 85 20 Ld 5x5 QFN L20.5X5
COMP 1 N/C 2 DROOP 3 FB 4 VSEN 5
20 19 18 17 16
20 Ld QFN Tape and Reel Evaluation Platform 1 (SOIC Package, ISL6558CB + HIP6601BCB) Evaluation Platform 2 (QFN Package, ISL6558CR + ISL6605CR)
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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. 2003. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL6558 Block Diagram
PGOOD VCC
POWER-ON RESET (POR) VSEN X 0.9 UV + S + OV OV LATC H R CLOCK AND SAWTOOTH GENERATOR + X1.15 FS/EN THREE-STATE
-
+ PWM PWM1
+
SOFTSTART AND FAULT LOGIC
-
+ PWM -
PWM2
COMP
+
-
+ PWM -
PWM3
0.8V REFERENCE + E/A -
+
-
+ PWM -
PWM4
FB
CURRENT CORRECTION
PHASE NUMBER
C HANNEL DETECTOR
DROOP ITOTAL + OC ITRIP + + ISEN1
+
+
ISEN2 ISEN3 ISEN4
GND
2
ISL6558 Functional Pin Description
NOTE: Pin numbers refer to the SOIC package. Check PINOUT diagrams for QFN pin numbers.
FS/EN (Pin 7)
Connecting a resistor from this pin to ground sets the internal oscillator frequency. The switching frequency, FSW, of the converter is adjustable between 80kHz and 1.5MHz. Pulling this pin to ground disables the converter and threestates the PWM outputs.
VCC (Pin 1)
Supplies all the power necessary to operate the chip. The IC starts to operate when the voltage on this pin exceeds the rising POR threshold and shuts down when the voltage on this pin drops below the falling POR threshold. Connect this pin to a 5V (±5%) supply.
GND (Pin 8)
Bias and reference ground for all controller signals.
PGOOD (Pin 2)
Power good is an open drain output used to indicate the status of the output voltage. This pin is pulled low when the converter output voltage is either 10% below or 15% above the reference voltage.
PWM1 (Pin 13), PWM2 (Pin 12), PWM3 (Pin 9), PWM4 (Pin 16)
The controller PWM drive signals are connected to the individual HIP660x driver PWM input pins. The number of active channels is determined by the state of PWM3 and PWM4. If PWM3 is tied to VCC, this indicates to the controller that two channel operation is desired. In this case, PWM4 should be left open or tied to VCC. Tying PWM4 to VCC indicates that three channel operation is desired.
COMP (Pin 3)
Output of the internal error amplifier. Connect this pin to the external feedback compensation network.
DROOP (Pin 4)
Output voltage droop or active voltage positioning is provided by connecting this pin to the FB pin. An internal current source creates the droop across an external feedback resistor, RFB. If no droop is desired, this pin MUST be left open.
ISEN1 (Pin14), ISEN2 (Pin 11), ISEN3 (Pin 10), ISEN4 (Pin15)
These pins are used to monitor the voltage drop across the lower MOSFETs for current feedback, output voltage droop and overcurrent protection. A resistor must be placed in series with each of these inputs and their respective PHASE node. The resistor is sized such that the current feedback is 50µA at full load. Sense lines corresponding to inactive channels should be left open. Inactive channels are those in which the PWM pin has been tied to VCC or left open.
FB (Pin 5)
The FB pin is the inverting input of the internal error amplifier. Connect this pin to the external feedback compensation network and a resistor divider from the output for proper control and protection of converter load.
THermal Pad (in QFN only)
In the QFN package, the pad underneath the center of the IC is a thermal substrate. The PCB "thermal land" design for this exposed die pad should include thermal vias that drop down and connect to one or more buried copper plane(s). This combination of vias for vertical heat escape and buried planes for heat spreading allows the QFN to achieve its full thermal potential. This pad should be either grounded or floating, and it should not be connected to other nodes. Refer to TB389 for design guidelines.
VSEN (Pin 6)
This pin is connected through a resistor divider to the converter's output voltage to provide remote sensing. The undervoltage and overvoltage protection comparators trigger off this input.
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