DATA SHORT
To request the full datasheet, please visit
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ISL95857C
1+2+1 Voltage Regulator With Expanded Iccmax Register Range Supporting
Intel IMVP8 CFL/CNL CPUs
The
ISL95857C
provides a complete power solution for
Intel microprocessors supporting core, graphics, and
system agent rails and is compliant with Intel IMVP8.
The controller provides control and protection for three
Voltage Regulator (VR) outputs. The VR A and VR C
outputs support 1-phase operation only, while VR B is
configurable for 2- or 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 (DE) mode with
load-dependent low switching frequency.
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 ISL95857C 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.
0.91
0.90
0.89
0.88
0.87
0.86
0.85
0.84
0
5
10
15
20
25
V
IN
= 21V
V
IN
= 12V
V
IN
= 6V
0.91
0.90
0.89
0.88
0.87
0.86
0.85
0.84
0.83
0.82
0
5
10
15
20
25
30
35
40
V
IN
= 21V
V
IN
= 12V
V
IN
= 6V
FN8968
Rev.0.00
Oct 5, 2017
Features
• Supports the Intel serial data bus interface
• Fully supports PS4 Power Domain entry/exit
• Supports system input power monitor (PSYS)
• Three output controller
• VR A supports 1-phase VR design
• VR B configurable for 2- or 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
• Resistor programmable address selection, I
MAX
, and
switching frequency
Applications
• IMVP8 CFL and CNL compliant notebooks,
desktops, Ultrabooks, and tablets
Related Literature
• For a full list of related documents, visit our website
•
ISL95857C
product page
0.91
0.90
0.89
0.88
0.87
0.86
0.85
0.84
0
1
2
3
4
5
6
V
IN
= 21V
V
IN
= 12V
V
IN
= 6V
Figure 1. V
CORE
/VR A Load
Line = 2.4mΩ
Figure 2. VGT/VR B Load Line = 2mΩ Figure 3. VSA/VR C Load Line = 10.3mΩ
FN8968 Rev.0.00
Oct 5, 2017
Page 1 of 2
ISL95857C
© Copyright Intersil Americas LLC 2017. All Rights Reserved.
All trademarks and registered trademarks are the property of their respective owners.
For additional products, see
www.intersil.com/en/products.html
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
FN8968 Rev.0.00
Oct 5, 2017
Page 2 of 2
Microcontroller MCU
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