1 datasheet to request the full datasheet, please visit www.intersil.com/products/isl95857 caution: these devices are sensitive to electrostatic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | copyright intersil americas llc 2016. all rights reserved intersil (and design) and r3 technology are trademarks ow ned by intersil corporation or one of its subsidiaries. all other trademarks mentioned are the property of their respective owners. 1+2+1 voltage regulator for intel imvp8? cpus isl95857 compliant with intel imvp8?, the isl95857 provides a complete power solution for intel microprocessors supporting core, graphics and system agent rails. the controller provides control and protection for th ree voltage regulator (vr) outputs. vr a and vr c outputs support 1-phase operation only, while vr b is configurable for 2- or 1-phase operation. the address options programmable for these three outputs allow for maximum flexibility in support of the imvp8? cpu. all three vrs share a common serial contro l bus to communicate with the cpu and achieve lower cost and smaller board area compared with a two-chip approach. based on intersil?s robust ripple regulator (r3?) technology, the r3? modulator has many advantages compared to traditional modulators. these include faster transient settling time, variable switching freq uency in response to load transients and improved light-load efficiency due to diode emulation mode with load-dependent low switching frequency. the isl95857 has several other key features. the controller provides pwm outputs, which support intel drmos power stages (or similar) and discrete power stages using the intersil isl95808 high voltage synchron ous rectified buck mosfet driver. the controller complies with imvp8? ps4 power requirements and supports power stages and drivers which are compatible. the isl95857 supports the system input power monitor (psys) option. the controller supports either dcr current sensing with a single ntc thermistor for dcr temperature compensation or mo re precision through resistor current sensing if desired. all three outputs feature remote voltage sense, programmable i max , adjustable switching frequency, oc protection and a single vr_rea dy power-good indicator. features ? supports intel serial data bus interface ? system input power monitor (psys) supported ? three output controller - vr a supports 1-phase vr design - vr b configurable for 2-, 1-phase vr design - vr c supports 1-phase vr design ? 0.5% system accuracy over temperature ? low supply current in ps4 state ? supports multiple current sensing methods - lossless inductor dcr current sensing - precision resistor current sensing ? differential remote voltage sensing ? programmable svid address ? resistor programmable address selection, i max and switching frequency applications ? imvp8 compliant notebooks, desktops, ultrabooks and tablets figure 1a. v core /vr a load line = 2.4m ? figure 1b. vgt/vr b load line = 2m ? figure 1c. vsa/vr c load line = 10.3m ? figure 1. load line regulation 0.84 0.85 0.86 0.87 0.88 0.89 0.90 0.91 0 5 10 15 20 25 v in = 12v v in = 6v v in = 21v 0.82 0.83 0.84 0.85 0.86 0.87 0.88 0.89 0.90 0.91 0 5 10 15 20 25 30 35 40 v in = 12v v in = 6v v in = 21v 0.84 0.85 0.86 0.87 0.88 0.89 0.90 0.91 0123456 v in = 12v v in = 6v v in = 21v february 11, 2016 fn8750.2
isl95857 2 intersil products are manufactured, assembled and tested utilizing iso9001 quality systems as noted in the quality certifications found at www.intersil.com/en/suppor t/qualandreliability.html intersil products are sold by description only. intersil corporat ion reserves the right to make changes in circuit design, soft ware 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 responsi bility is assumed by intersil or its subsid iaries for its use; nor for any infringem ents 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 i ntersil or its subsidiaries. for information regarding intersil corporation and its products, see www.intersil.com fn8750.2 february 11, 2016 for additional products, see www.intersil.com/en/products.html submit document feedback
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