DATA SHORT
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ISL95855A
3+2+1 Voltage Regulator for IMVP8™ CPUs
Compliant with IMVP8™, the
ISL95855A
provides a complete
power solution for Intel microprocessors supporting core,
graphics and system agent rails. The controller provides
control and protection for three 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 these three outputs allow for
maximum flexibility in support of the IMVP8™ CPU. All three
VRs 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 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 synchronous 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_READY power-good
indicator.
FN8820
Rev.0.00
May 6, 2016
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
0.91
0.90
0.89
0.88
V
OUT
(V)
0.87
0.86
0.85
0.84
0.83
0.82
0.81
0.80
0
6
V
IN
= 19V
V
IN
= 12V
V
IN
= 8V
12
18
24
30 36
I
OUT
(A)
42
48
54
60
66
FIGURE 1. LOAD LINE REGULATION
FN8820 Rev.0.00
May 6, 2016
Page 1 of 2
ISL95855A
© Copyright Intersil Americas LLC 2016. All Rights Reserved.
All trademarks and registered trademarks are the property of their respective owners.
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
FN8820 Rev.0.00
May 6, 2016
Page 2 of 2
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