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Part: ISL6557A
Category:
Power Management
-> Desktop
Description: Multi-phase PWM Controller For Core-voltage Regulation
Company: Intersil Corporation
Datasheet: Download ISL6557A datasheet File size : 476 kB
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Datasheet text preview:
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ISL6557A
D a ta Sheet J u l y 2003 FN9068.1
Multi-Phase PWM Controller for Core-Voltage Regulation
The ISL6557A 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-suppply solutions available to power the latest industry-leading microprocessors. Multi-phase buck converter 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 ISL6557A 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 igMHz giving the designer the ultimate flexibility in managing the balance between high-speed response and good thermal management. New features on the ISL6557A include Dynamic-VIDTM technology allowing seamless on-the-fly VID changes with no need for any additional external components. When the ISL6557A 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 ISL6557A uses cost and space-saving rDS(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 rDS(ON) Current 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 - 0.800V to 1.550V 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 ISL65 57ACB ISL65 57ACB-T TEMP. (oC) 0 to 70 PACKAGE 24-Ld SOIC PKG. DWG. # M2 4.3
20-Ld SOIC Tape and Reel
Pinout
ISL6557A 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 1 1 GND 12 24 VCC 23 EN 2 2 FS 21 PGOOD 20 PWM4 19 ISEN4 18 ISEN1 17 PWM1 16 PWM2 15 ISEN2 14 ISEN3 13 PWM3
1
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. 2003. All Rights Reserved. All other trademarks mentioned are the property of their respective owners. Dynamic VIDTM is a trademark of Intersil Americas Inc.
ISL6557A 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
x 0.9
2.1V SOFTSTART AND FAULT LOGIC
+
+ PWM
PWM2
-
COMP 2.5V VID0 VID1 VID2 VID3 VID4 DYNAMIC VID D/A +
-
+ PWM
PWM3
-
-
+ PWM
+ E/A -
PWM4
-
FB
CURRENT CORRECTION PHASE NUMBER
CH ANNEL DETECTOR
IOUT I_TOT OC +
IOC
+
ISEN1 + + ISEN2 ISEN3 ISEN4
+
GND
2
ISL6557A Typical Application - 4-Phase Buck Converter
+12V VIN
VCC PVCC
BOOT UGATE PHASE HIP6601A DRIVER LGATE GND
+5V
PWM
FB VDIFF VSEN RGND PGOOD VID4 VID3 VID2 VID1 VID0 FS RT
IOUT
CO MP VCC EN
+12V VIN
VCC PVCC
BOOT UGATE PHASE HIP6601A DRIVER LGATE GND
ISEN1 ISL6557A PWM1 PWM2 ISEN2 PWM3 ISEN3 PWM4 ISEN4 GND PVCC VCC +12V PWM
VIN µP LOAD BOOT UGATE PHASE HIP6601A DRIVER LGATE GND
PWM
+12V VIN
VCC PVCC
BOOT UGATE PHASE HIP6601A DRIVER
PWM
LGATE GND
3
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