ISL9502 SIGNS N E W DE R O F D T ENrequest N DE the full datasheet, please visit www.intersil.com/products/isl9502 LACEMTo COMME P E E R R T D O at E N r D N te E n e M C OM p p o rt NO R E C al SuSheet Data July 17, 2006 FN9275.1 om/tsc Technic r u o ntersil.c t .i c w w w r conta o TERSIL 1-888-IN Two-Phase PWM Controller for Graphics Processor Units (GPU) Increase in GPU clock frequency is accompanied by associated increase in the demand for power and transientcurrent slew rate. At the same time, the voltage tolerance requirement during steady-state and transient operation is becoming more stringent of advanced GPU. The ISL9502 is a two-phase PWM controller with embedded gate drivers, which is tailored to meet the power and dynamic requirements. The two-phase buck converter uses two interleaved channels to effectively double the output voltage ripple frequency and thereby reduce output voltage ripple amplitude with fewer components, lower component cost, reduced power dissipation, and smaller real estate area. The heart of the ISL9502 is the patented R3 (Robust Ripple Regulator™) modulator. Compared with the traditional multiphase buck regulator, R3 technology has the fastest transient response. This is due to the R3 modulator commanding variable switching frequency during a load transient. Features • Precision Two-phase Buck PWM controller - 0.5% System Accuracy Over Temperature - Active Voltage Positioning Capability • Internal Gate Driver with 2A Driving Capability • Superior Load Transient Response • Dynamic Phase Adding/Dropping • Voltage Selection Input - 6-Bit VSEL Input - 0.500V to 1.500V in 25mV Steps - Supports VSEL Change On-The-Fly • Multiple Current-Sensing Schemes Supported - Lossless Inductor DCR Current Sensing - Precision Resistive Current Sensing • Thermal Monitor • User Programmable Switching Frequency At heavy load operation of the active mode, ISL9502 commands the two phase continuous conduction mode (CCM) operation. While the pin SET3 is asserted at the medium or light load, the ISL9502 smoothly disables one phase and operates in a one-phase operation. Once in onephase operation, when the GPU further lowers the load current, the ISL9502 enables diode emulation to maximize efficiency at light load depending on the logic of SET1 and SET2. • Differential Remote GPU Voltage Sensing A 6-bit digital-to-analog converter (DAC) allows dynamic adjustment of the output voltage from 0.500V to 1.500V with 25mV step. A 0.5% system accuracy of the core output voltage over temperature is achieved by the ISL9502. ISL9502CRZ (Note) A unity-gain differential amplifier is provided for remote GPU die sensing. This allows the voltage on the GPU die to be accurately measured and regulated. Current sensing can be realized using either lossless inductor DCR sensing or precision resistor sensing. A single NTC thermistor network can thermally compensates the gain and the time constant of the DCR variations. Droop control, also referred as adaptive voltage positioning (AVP), is implemented in ISL9502 to reduce output decoupling capacitors and achieve more costeffective transient-load regulation. NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 1 • Static and Dynamic Current Sharing • Overvoltage, Undervoltage, and Overcurrent Protection • Pb-Free Plus Anneal Available (RoHS Compliant) Ordering Information PART NUMBER PART MARKING TEMP. (°C) PACKAGE PKG. DWG. # ISL9502CRZ -10 to 100 48 Ld 7x7 QFN L48.7x7 (Pb-free) ISL9502CRZ-T ISL9502CRZ -10 to 100 48 Ld 7x7 QFN L48.7x7 (Note) (Pb-free) CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a trademark of Intersil Americas LLC. Copyright Intersil Americas LLC. 2006. All Rights Reserved. R3 Technology™ is a trademark of Intersil Americas LLC. All other trademarks mentioned are the property of their respective owners. ISL9502 For additional products, see www.intersil.com/en/products.html Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted in the quality certifications found at www.intersil.com/en/support/qualandreliability.html Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software 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 FN9275.1 July 17, 2006