DATA SHORT
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ISL95855A
3+2+1 Voltage Regulator for IMVP8™ CPUs
FN8820
Rev.0.00
May 6, 2016
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.
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
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.
• Supports multiple current sensing methods
- Lossless inductor DCR current sensing
- Precision resistor current sensing
• Differential remote voltage sensing
• Programmable SVID address
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
• Programmable V
BOOT
voltage at start-up
• Resistor programmable address selection, I
switching frequency and droop
, slew rate,
MAX
• Adaptive body diode conduction time reduction
Applications
• IMVP8 compliant notebooks, desktops, ultrabooks and
tablets
voltage sense, programmable I
, adjustable switching
MAX
frequency, OC protection and a single VR_READY power-good
indicator.
0.91
0.90
0.89
0.88
0.87
0.86
0.85
0.84
0.83
0.82
0.81
0.80
V
= 19V
IN
V
= 12V
IN
V
= 8V
IN
0
6
12 18 24 30 36 42 48 54 60 66
(A)
I
OUT
FIGURE 1. LOAD LINE REGULATION
FN8820 Rev.0.00
May 6, 2016
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