ISL95858 Datasheet, PDF (1/2 Pages) Intersil Corporation – Multiphase PWM Regulator for Intel IMVP8 Desktop CPUs

DATASHEET
To request the full datasheet, please visit www.intersil.com/products/isl95858
3+2 Multiphase PWM Regulator for Intel IMVP8™
Desktop CPUs
ISL95858
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.
Features
• Supports Intel serial data bus interface
• SMBus/PMBus/I²C 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
80
PS1
PS0
70
PS2
60
50
40
0
10
20
30
40
50
60
LOAD CURRENT (A)
FIGURE 1. VR A EFFICIENCY vs LOAD
100
90
80
PS1
PS0
70
PS2/3
60
50
40
0
5
10
15
20
25
30
35
LOAD CURRENT (A)
FIGURE 2. VR B EFFICIENCY vs LOAD
July 2, 2015
FN8739.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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