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DATASHEET
To request the full datasheet, please visit www.intersil.com/products/isl95816
4-Phase PWM Controller for VR12.5 CPUs
ISL95816
The ISL95816 Pulse Width Modulation (PWM) controller IC
provides a complete solution for VR12.5™ compliant
microprocessor core power supplies. It provides the control
and protection for a Voltage Regulator (VR). The VR can
operate in 4-, 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 ISL95816 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; remote voltage sense; programmable
V
BOOT
voltage, I
MAX,
voltage transition slew rate and switching
frequency; adjustable overcurrent protection; and Power-Good
signal.
Features
•Serial data bus
• Configurable 4-, 3-, 2- or 1-phase
•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
•Programmable V
BOOT
voltage at start-up
• Resistor programmable I
MAX
, V
BOOT
, voltage transition slew
rate and switching frequency
• Adaptive body diode conduction time reduction
Applications
• VR12.5 Notebook and Desktop Computers
FIGURE 1. SIMPLIFIED APPLICATION CIRCUIT
FIGURE 2. LOAD LINE REGULATION
ISL95816
L2
L1
PWM2
L3
PHASE1
PWM1
PWM3
Vcore
VDD
+5V
VIN
VIN
PHASEPWM
GND
Vin
Power Stage
PWM4
L4
VIN
PHASEPWM
GND
Power Stage
VIN
PHASEPWM
GND
Power Stage
VIN
PHASEPWM
GND
Power Stage
BIAS
BIAS
BIAS
BIAS
DRCTRL
1.72
1.74
1.76
1.78
1.80
1.82
0 10 20 30 40
V
OUT
(V)
I
OUT
(A)
LOADLINE, V
O
= 1.8V, PS0
V
IN
= 6V
V
IN
= 12.6V
V
IN
= 19V
V
MAX
V
MIN
August 2, 2013
FN7979.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|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.
All other trademarks mentioned are the property of their respective owners.
