DATA SHORT
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ISL95858
3+2 Multiphase PWM Regulator for Intel IMVP8™ Desktop CPUs
Compliant with Intel IMVP8™, the
ISL95858
provides a
complete power solution for desktop microprocessors
supporting both the core (IA) and graphics (GT) rails. The
controller provides control and protection for one voltage
regulator (VR), which can be configured for 3-, 2- or 1-phase
operation. The second VR is configurable for 2- or 1-phase
operation. The VRs feature a programmable SVID address to
allow maximum flexibility in supporting desktop processor SKUs.
Both controller outputs share a common serial control 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 frequency in response to load transients
and improved light-load efficiency due to diode emulation
mode with load-dependent low switching frequency.
The ISL95858 has several other key features. The controller
features three integrated +12V gate drivers with two drivers on
the VR B output. 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. Both outputs feature remote voltage sense,
programmable I
MAX
, adjustable switching frequency, OC
protection and single VR_READY power-good indicator.
FN8739
Rev 1.00
July 2, 2015
Features
• Supports Intel serial data bus interface
• SMBus/PMBus/I
2
C interface with SVID conflict free
•
Green hybrid digital
R3™ modulator
- Excellent transient response
- Phase shedding with power state selection
- Diode emulation in single-phase for high light-load
efficiency
• Dual output controller
- Voltage regulator A: 3-, 2-, or 1-phase designs with two
+12V integrated gate drivers
- Voltage regulator B: 2-, or 1-phase designs with one +12V
integrated gate driver
• 0.5% system accuracy over-temperature
• Supports multiple current sensing methods
- Lossless inductor DCR current sensing
- Precision resistor current sensing
• Differential remote voltage sensing
• Resistor programmable address selection, I
MAX
and
switching frequency for both outputs
• Adaptive body diode conduction time reduction
Applications
• IMVP8™ compliant desktops
100
90
EFFICIENCY (%)
EFFICIENCY (%)
80
PS1
70
PS2
60
50
40
100
90
80
PS1
70
PS2/3
60
50
40
PS0
PS0
0
10
20
30
40
LOAD CURRENT (A)
50
60
0
5
10
15
20
LOAD CURRENT (A)
25
30
35
FIGURE 1. VR A EFFICIENCY vs LOAD
FIGURE 2. VR B EFFICIENCY vs LOAD
FN8739 Rev 1.00
July 2, 2015
Page 1 of 2
ISL95858
© Copyright Intersil Americas LLC 2015. All Rights Reserved.
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For additional products, see
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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 may modify the circuit design and/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 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
FN8739 Rev 1.00
July 2, 2015
Page 2 of 2
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