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Part: ISL6557
Category:
Power Management
-> Desktop
Description: Multi-phase PWM Controller For Core-voltage Regulation
Company: Intersil Corporation
Datasheet: Download ISL6557 datasheet File size : 476 kB
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Datasheet text preview:
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ISL6557
TM
Da ta Sheet
F e b r u a r y 2002
FN9059.1
Multi-Phase PWM Controller for Core-Voltage Regulation
The ISL6557 provides core-voltage regulation by driving up to four interleaved synchronous-rectified buck-converter channels in parallel. Intersil multi-phase controllers together with Intersil MOSFET drivers form the basis for the most reliable power-supply solutions available to power the latest industry-leading microprocessors. Multi-phase buckconver ter architecture uses interleaved timing to multiply ripple frequency and reduce input and output ripple currents. Lower ripple results in lower total component cost, reduced dissipation, and smaller implementation area. Preconfigured for 4-phase operation, the ISL6557 offers the flexibility of selectable 2- or 3-phase operation. Simply connect the unused PWM pins to VCC. The channel switching frequency is adjustable in the range of 50kHz to 1.5MHz giving the designer the ultimate flexibility in managing the balance between high-speed response and good thermal management. New features on the ISL6557 include Dynamic-VIDTM technology allowing seamless on-the-fly VID changes with no need for any additional external components. When the ISL6557 receives a new VID code, it incrementally steps the output voltage to the new level. Dynamic VID changes are fast and reliable with no output voltage overshoot or undershoot. The RGND and VSEN pins provide inputs for differential remote voltage sensing to improve regulation and protection accuracy. A threshold-sensitive enable pin (EN) can be used with an external resistor divider to optionally set the power-on voltage level. This allows optional start-up coordination with Intersil MOSFET drivers or any other devices powered from a separate supply. Like other Intersil multiphase controllers, the ISL6557 uses cost and space-saving DS(ON) sensing for channel current balance, dynamic voltage positioning, and overcurrent protection. Channel current balancing is automatic and accurate with the integrated current-balance control system. Overcurrent protection can be tailored to any application with no need for additional parts. The IOUT pin carries a signal proportional to load current and can be optionally connected to FB for accurate load-line regulation. An integrated DAC decodes the 5-bit logic signal present at VID4-VID0 and provides an accurate reference for precision voltage regulation. The high-bandwidth error amplifier, differential remote-sensing amplifier, and accurate voltage reference all work together to provide better than 0.8% total system accuracy, and to enable the fastest transient response available.
Features
· Multi-Phase Power Conversion · Active Channel Current Balancing · Precision DS(ON) urrent Sensing - Low Cost - Lossless · Precision CORE Voltage Regulation - Differential Remote Voltage Sensing - ±0.8% System Accuracy · Microprocessor Voltage Identification Input - Dynamic VID technology - 5-Bit VID Input - 1.100V to 1.850V in 25mV Steps · Programmable Power-On Bias Level · Programmable Droop Voltage · Fast Transient Recovery Time · Precision Enable Threshold · Overcurrent Protection · 2-, 3-, or 4-Phase Operation · High Ripple Frequency. Channel Frequency Times Number Channels (100kHz to 6MHz)
Ordering Information
PART NUMBER ISL6557CB ISL6557CB-T TEMP. (oC) 0 to 70 PACKAGE 24-Ld SOIC PKG. NO. M24.3
20-Ld SOIC Tape and Reel
Pinout
ISL6557 24-PIN SOIC TOP VIEW
VID4 1 VID3 2 VID2 3 VID1 4 VID0 5 COMP 6 FB 7 IOUT 8 VDIFF 9 VSEN 10 RGND 11 GND 12 24 VCC 23 EN 22 FS 21 PGOOD 20 PWM4 19 ISEN4 18 ISEN1 17 PWM1 16 PWM2 15 ISEN2 14 ISEN3 13 PWM3
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. 2002. All Rights Reserved Dynamic VIDTM is a trademark of Intersil Americas Inc.
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ISL6557 Block Diagram
VDIFF
PGOOD
VCC
RGND
x1 + POWER-ON RESET (POR) UV + OV S LATCH CLOCK AND SAWTOOTH GENERATOR +
1.23V
EN
FS
VSEN
+ OVP -
+
+
+ PWM
PWM1
-
0.9V
2.1V SOFTSTART AND FAULT LOGIC
+
+ PWM
PWM2
-
COMP 2.5V VID0 VID1 VID2 VID3 VID4 DYNAMIC VID D/A + + E/A -
-
+ PWM
PWM3
-
-
+ PWM
PWM4
-
FB
CURRENT CORRECTION PHASE NUMBER
CHANNEL DETECTOR
IOUT I_TOT OC +
I OC
+
ISEN1 + + ISEN2 ISEN3 ISEN4
+
GND
ISL6557 Typical Application, 4-Phase Buck Converter
+12V VIN
VCC PVCC
BOOT UGATE PHASE
PWM +5V
HIP6601A DRIVER
LGATE GND
FB VDIFF VSEN RGND PGOOD VID4 VID3 VID2 VID1 VID0 FS RT
IOUT
COMP VCC EN
+12V VIN
VCC PVCC
BOOT UGATE PHASE
ISL6557
ISEN1 PWM1 PWM2 ISEN2 PWM3 ISEN3 PWM4 ISEN4 GND
PWM
HIP6601A DRIVER
LGATE GND
+12V VIN
µP LOAD
VCC PVCC
BOOT UGATE PHASE
PWM
HIP6601A DRIVER
LGATE GND
+12V VIN
VCC PVCC
BOOT UGATE PHASE
PWM
HIP6601A DRIVER
LGATE GND
3
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