DATA SHORT
To request the full datasheet, please visit
www.intersil.com/products/isl95816
ISL95816
4-Phase PWM Controller for VR12.5 CPUs
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.
FN7979
Rev 0.00
August 2, 2013
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
VDD
+5V
VIN
DRCTRL
PWM4
Vin
1.82
L4
BIAS
PWM
VIN
PHASE
LOADLINE, V
O
= 1.8V, PS0
1.80
V
MAX
Power Stage
GND
PWM3
PWM
Power Stage
GND
PHASE
V
OUT
(V)
BIAS
VIN
L3
1.78
V
IN
= 6V
1.76
V
IN
= 12.6V
1.74
V
MIN
V
IN
= 19V
Vcore
ISL95816
BIAS
VIN
PHASE
PWM2
L2
PWM
Power Stage
GND
BIAS
VIN
PHASE
L1
1.72
0
10
20
I
OUT
(A)
30
40
PWM1
PHASE1
PWM
Power Stage
GND
FIGURE 1. SIMPLIFIED APPLICATION CIRCUIT
FIGURE 2. LOAD LINE REGULATION
FN7979 Rev 0.00
August 2, 2013
Page 1 of 2
ISL95816
© Copyright Intersil Americas LLC 2013. 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
FN7979 Rev 0.00
August 2, 2013
Page 2 of 2
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