FN8969 Rev.0.00 Page 1 of 2
Oct 16, 2017
FN8969
Rev.0.00
Oct 16, 2017
ISL95855C
3+2+1 Voltage Regulator With Expanded Iccmax Register Range Supporting
IMVP8 CFL/CNL CPUs
DATA SHORT
To request the full datasheet, please visit www.intersil.com/products/ISL95855C
The ISL95855C is compliant with IMVP8™, and
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 for these three outputs allow for
maximum flexibility to support 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. The
ISL95855C has expanded Iccmax register tables for VR A
and VR C to support Intel CFL-H.
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 ISL95855C 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 compatible power stages and
drivers. The controller supports DCR current sensing
with a single NTC thermistor for DCR temperature
compensation, or more precision through resistor current
sensing.
Features
• Supports Intel serial data bus interface
• Fully supports PS4 power domain entry and exit
• Supports system input power monitor (PSYS)
• 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
• Supports higher Iccmax range of CFL-H CPUs
Related Literature
• For a full list of related documents, visit our website
• ISL95855C
product page
Figure 1. Load Line Regulation
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
