1
DATASHEET
To request the full datasheet, please visit www.intersil.com/products/isl95816a
4-Phase PWM Controller for VR12.5 and VR12.6 CPUs
ISL95816A
The ISL95816A Pulse Width Modulation (PWM) controller IC
provides a complete solution for VR12.5™ and VR12.6™
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 ISL95816A 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
• Low supply current in PS4 state
Applications
• VR12.5 and VR12.6 notebook and desktop computers
FIGURE 1. SIMPLIFIED APPLICATION CIRCUIT FIGURE 2. LOAD LINE REGULATION
ISL95816A
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
January 14, 2014
FN8599.1
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, 2014. 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.
