fn8561 rev 0.00 page 1 of 2 june 24, 2013 fn8561 rev 0.00 june 24, 2013 ISL95833B dual 2+1 pwm controller for imvp-7/vr12 cpus data short to request the full datasheet, please visit www.intersil.com/products/ISL95833B the ISL95833B pulse width modula tion (pwm) controller ic provides a complete solution for imvp-7/vr12? compliant microprocessor and graphic processor core power supplies. it provides the control and protection for two voltage regulators (vrs). the first vr, typically for v core , incorporates 1 integrated driver and can operate in 2- or 1-phase configurations. the second vr, typically for graphics, is a single phase regulator incorporating an integrated driver. the two vrs share a serial control bus to communicate with the cpu and achieve lower cost and smaller board area compared with the two-chip approach. both vrs utilize intersil's robust ripple regulator r3 technology?. the r3 modulator has numerous advantages compared to traditional modulators, including faster transient response, variable switching frequency during load transients, and improved light load efficiency due to its ability to automatically change switching frequency. the ISL95833B has several other key features. both outputs support either dcr current sensing with a single ntc thermistor for dcr temperature compensation, or more precise resistor current sensing if desired. both outputs come with remote voltage sense, programmable vboot voltage, imax, and switching frequency, adjustable overcurrent protection and separate power-good signals. features ?serial data bus ? dual outputs: - configurable 2- or 1-phase for the 1st output using one integrated gate driver - 1-phase for the 2nd output using an integrated gate driver ?r3? modulator - excellent transient response - high light load efficiency ? 0.5% system accuracy over-temperature ? supports multiple current sensing methods - lossless inductor dcr current sensing - precision resistor current sensing ? differential remote voltage sensing ? programmable vboot voltage at start-up ? resistor programmable imax and switching frequency (400khz ~ 600khz) for both outputs ? adaptive body diode conduction time reduction applications ? imvp-7/vr12 compliant computers figure 1. simplified application circuit figure 2. load line regulation isl6208 driver ISL95833B v in vr2 v in vr1 v in 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
fn8561 rev 0.00 page 2 of 2 june 24, 2013 ISL95833B 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 2013. all rights reserved. all trademarks and registered trademarks are the property of their respective owners.
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