fn8820 rev.0.00 page 1 of 2 may 6, 2016 fn8820 rev.0.00 may 6, 2016 ISL95855A 3+2+1 voltage regulator for imvp8? cpus data short to request the full datasheet, please visit www.intersil.com/products/ISL95855A compliant with imvp8?, the ISL95855A provides a complete power solution for intel microprocessors supporting core, graphics and system agent rail s. the controller provides control and protection for th ree voltage regulator (vr) outputs. the vr a output can be configured for 3-, 2- or 1-phase operation. vr b is configurable for 2- or 1-phase operation and vr c supports 1- phase operation. the address options programmable for thes e 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 ISL95855A 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 ISL95855A 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 more 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 ? support intel serial data bus interface - ps4 power domain entry/exit fully supported ? system input power monitor (psys) supported ? three output controller - vr a configurable for 3-, 2-, 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 ?programmable v boot voltage at start-up ? resistor programmable address selection, i max , slew rate, switching frequency and droop ? adaptive body diode conduction time reduction applications ? imvp8 compliant notebooks, desktops, ultrabooks and tablets 0.80 0.81 0.82 0.83 0.84 0.85 0.86 0.87 0.88 0.89 0.90 0.91 30 36 42 48 54 60 66 i out (a) v out (v) 06121824 v in = 19v v in = 12v v in = 8v figure 1. load line regulation
fn8820 rev.0.00 page 2 of 2 may 6, 2016 ISL95855A 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 on ly. intersil may modify the circuit design an d/or specifications of products at any time without notice, provided that such modification does not, in intersil's sole judgment, affect the form, fit or function of the product. accordingly, the reader is cautioned to verify that datasheets are current before placing orders. information fu rnished by intersil is believed to be accu rate and reliable. however, no responsib ility is assumed by intersil or its subsidiaries for its use; nor for any infrin gements 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 for additional products, see www.intersil.com/en/products.html ? copyright intersil americas llc 2016. all rights reserved. all trademarks and registered trademarks are the property of their respective owners.
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