1
DATASHEET
To request the full datasheet, please visit www.intersil.com/products/is95838
Dual 3+2 PWM Controller for IMVP-7/VR12™ CPUs
ISL95838
The ISL95838 Pulse Width Modulation (PWM) controller IC
provides a complete solution for IMVP-7/VR12™ compliant
microprocessor and graphic processor core power supplies. It
provides the control and protection for two Voltage Regulators
(VRs). The first VR, typical for Vcore, incorporates 2 integrated
drivers and can operate in 3-, 2- or 1-phase configurations. The
second VR, typical for Graphics, can operate in 2- or 1-phase
configurations. The two VRs share a serial control bus to
communicate with the CPU and achieve lower cost and smaller
board area compared with the two-chip approach.
Both VRs utilize 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 ISL95838 has several other key features. Both outputs
support either DCR current sensing with a single NTC
thermistor for DCR temperature compensation, or more
precise resistor current sensing if desired. Both outputs come
with remote voltage sense, programmable V
BOOT
voltage,
I
MAX,
and switching frequency, adjustable overcurrent
protection and separate Power-Good signals.
Features
•Serial Data Bus
•Dual Outputs:
- Configurable 3-, 2- or 1-phase for the 1st Output using two
integrated Gate Drivers
- Configurable 2- or 1-phase for the 2nd 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
•Programmable V
BOOT
Voltage at Start-up
• Resistor Programmable I
MAX
, Switching Frequency for Both
Outputs
• Adaptive Body Diode Conduction Time Reduction
Applications
• IMVP-7/VR12 Compliant Computers
FIGURE 1. SIMPLIFIED APPLICATION CIRCUIT
FIGURE 2. LOAD LINE REGULATION
ISL6208
DRIVER
ISL95838
Vin
VR2
Vin
VR1
Vin
Vin
ISL6208
DRIVER
Vin
ISL6208
DRIVER
0.80
0.81
0.82
0.83
0.84
0.85
0.86
0.87
0.88
0.89
0.90
0.91
30 36 42 48 54 60 66
I
OUT
(A)
V
OUT
(V)
06121824
V
IN
= 19V
V
IN
=
12V
V
IN
= 8V
October 15, 2015
FN7878.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Intersil (and design) and R3 Technology™ are trademarks owned by Intersil Corporation or one of its subsidiaries.
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