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DATASHEET
To request the full datasheet, please visit www.intersil.com/products/isl95825
Three Phases PWM Controller for VR12.5/VR12.6 CPUs
ISL95825
The ISL95825 Pulse Width Modulation (PWM) controller IC
provides a complete solution for VR12.5™/VR12.6™
compliant microprocessor core power supplies. It provides the
control and protection for a Voltage Regulator (VR). The VR can
operate in 3-, 2- or 1-phase configurations. The VR uses a serial
control bus to communicate with the CPU and achieve lower cost
and smaller board area.
The VR utilizes Intersil’s Robust Ripple Regulator R3
Technology™. The R3 modulator has numerous advantages
compared to traditional modulators, including faster transient
response, variable switching frequency during load transients,
and improved light load efficiency due to its ability to
automatically change switching frequency.
The ISL95825 has several other key features. It supports
either DCR current sensing with a single NTC thermistor for
DCR temperature compensation, or more precise resistor
current sensing if desired. The output comes with remote
voltage sense, programmable V
BOOT
voltage, I
CCMAX,
voltage
transition slew rate and switching frequency, adjustable
overcurrent protection and Power-Good signal.
Features
•Serial data bus
• Configurable 3-, 2- or 1-phase for the output
•R3 Modulator
- Excellent transient response
- High light load efficiency
• 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 I
CCMAX
, V
BOOT
at start-up, voltage
transition slew rate and switching frequency
• Adaptive body diode conduction time reduction
• Low supply current at PS4 state
Applications
• VR12.5/VR12.6 notebook and desktop computers
FIGURE 1. SIMPLIFIED APPLICATION CIRCUIT FIGURE 2. LOAD LINE REGULATION
ISL95825
L2
L1
PWM2
L3
PWM1
PWM3
V
CORE
VDD
+5V
VIN
V
IN
VIN
PHASE
PWM
GND
POWER STAGE
VIN
PHASE
PWM
GND
POWER STAGE
VIN
PHASE
PWM
GND
POWER STAGE
1.72
1.74
1.76
1.78
1.80
1.82
0 10 20 30 40
V
OUT
(V)
I
OUT
(A)
LOADLINE = 1.5mΩ, V
OUT
= 1.8V, PS0
V
MAX
V
MIN
V
IN
= 19V
V
IN
= 12V
V
IN
= 6V
December 17, 2013
FN8329.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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| Copyright Intersil Americas LLC 2013. All Rights Reserved
Intersil (and design) and R3 Technology™ are trademarks owned by Intersil Corporation or one of its subsidiaries.
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