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| (R) ISL6406, ISL6426 Data Sheet December 2002 FN9073 Low Input Voltage, Single Synchronous Buck Pulse-Width Modulation (PWM) Controller The ISL6406/26 is an adjustable frequency, synchronous buck switching regulator optimized for generating lower voltages for the distributed DC-DC architectures. The ISL6406 offers an adjustable output voltage, while the ISL6426 provides a fixed 1.8V output. Designed to drive N-Channel MOSFETs in synchronous buck topology, the ISL6406/26 integrates the control, output adjustment and protection functions into a single package. The ISL6406/26 provides simple, single feedback loop, voltage-mode control with fast transient response. The output voltage can be precisely regulated to as low as 0.8V, with a maximum tolerance of 1.5% over temperature and line voltage variations. The error amplifier features a 15MHz gain-bandwidth product and 6V/s slew rate which enables high converter bandwidth for fast transient performance. Protection from overcurrent conditions is provided by monitoring the rDS(ON) of the upper MOSFET to inhibit PWM operation appropriately. This approach simplifies the implementation and improves efficiency by eliminating the need for a current sense resistor. The wide programmable switching frequency range of 100kHz to 700kHz allows the use of small surface mount inductors and capacitors. The device also provides external frequency synchronization making it an ideal choice for DCDC converter applications. Features * Operates from 3.3V Input * 0.8V to VIN Output Range - 0.8V Internal Reference - 1.5% Over Load, Line Voltage and Temperature * Simple Single-Loop Control Design - Voltage-Mode PWM Control * Fast Transient Response - High-Bandwidth Error Amplifier - Full 0% to 100% Duty Cycle * Lossless, Programmable Overcurrent Protection - Uses Upper MOSFET's rDS(on) * Programmable Switching Frequency 100-700kHz * External Frequency Synchronization * Two Device Options Available - ISL6406 . . . . . . . . . . . . . . . . Adjustable Output Voltage - ISL6426 . . . . . . . . . . . . . . . . . . . . . . Fixed 1.8V Output * No External Current Sense Resistor Required * Internal Soft-Start * QFN Package: - Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Product Outline - Near Chip Scale Package Footprint; Improves PCB Efficiency, Thinner in Profile Applications * DC-DC Converter Modules * Broadband Customer Premise Equipment * Distributed DC-DC 3.3V, 2.5V and 1.8V Power Architectures for DSP, Logic, and Memory Ordering Information PART NUMBER ISL6406CB ISL6406IB ISL6406CR ISL6406IR ISL6406CV ISL6406IV ISL6426CB ISL6426IB ISL6426CR ISL6426IR ISL6426CV ISL6426IV TEMP. RANGE (oC) 0 to 70 -40 to 85 0 to 70 -40 to 85 0 to 70 -40 to 85 0 to 70 -40 to 85 0 to 70 -40 to 85 0 to 70 -40 to 85 PACKAGE 16 Ld SOIC 16 Ld SOIC 16 Ld QFN 16 Ld QFN 16 Ld TSSOP 16 Ld TSSOP 16 Ld SOIC 16 Ld SOIC 16 Ld QFN 16 Ld QFN 16 Ld TSSOP 16 Ld TSSOP PKG. NO. M16.15 M16.15 L16.5x5B L16.5x5B M16.173 M16.173 M16.15 M16.15 L16.5x5B L16.5x5B M16.173 M16.173 * Power Supplies for Microprocessors - PCs - Embedded Controllers * Integrated Access Devices * Memory Supplies * Personal Computer Peripherals * Industrial Power Supplies 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 registered trademark of Intersil Americas Inc. Copyright (c) Intersil Americas Inc. 2002. All Rights Reserved All other trademarks mentioned are the property of their respective owners. ISL6406, ISL6426 Pinouts ISL6406/26 (SOIC/TSSOP) TOP VIEW ISL6406/26 (QFN) TOP VIEW UGATE 14 LGATE BOOT 13 12 PHASE 11 VCC 10 CPGND 9 5 RT 6 SYNC / EN 7 FB 8 VOUT COMP GND 15 GND 1 LGATE 2 CPVOUT 3 OCSET 4 CT1 5 CT2 6 RT 7 SYNC / EN 8 16 UGATE 15 BOOT 14 PHASE 13 VCC 12 CPGND 11 COMP 10 VOUT 9 FB OCSET CT1 CT2 2 3 4 CPVOUT 1 16 Functional Block Diagram VCC CPVOUT CT1 CT2 CPGND OCSET 20A CHARGE PUMP SDWN POWER-ON RESET (POR) BOOT OC COMPARATOR + - SOFTSTART UGATE PHASE ERROR AMP + PWM COMPARATOR + SDWN FB VOUT COMP OSCILLATOR INHIBIT + 0.8V - GATE CONTROL LOGIC PWM LGATE SYNC / EN RT GND All Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems. 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 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; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 2 |
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