ISL95839 Datasheet, PDF (1/36 Pages) Intersil Corporation – Dual 3+1 PWM Controller with Current Monitor for IMVP-7/VR12™ CPUs

Dual 3+1 PWM Controller with Current Monitor for
IMVP-7/VR12™ CPUs
ISL95839
The ISL95839 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 V_core, incorporates 2 integrated
drivers and can operate in 3-, 2- or 1-phase configurations. The
second VR, typical for Graphics, incorporates 1 integrated
driver. 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 ISL95839 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
- 2nd output using an integrated gate driver
• 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
• Output current monitor (IMON and IMONG)
• Adaptive body diode conduction time reduction
Applications
• IMVP-7/VR12 compliant computers
Vin
VR2
Vin
ISL95839
ISL6208B
DRIVER
Vin
VR1
Vin
0.91
0.90
0.89
0.88
0.87
0.86
0.85
0.84
0.83
0.82
0.81
0.80
0
V_IN = 19V
V_IN = 12V
V_IN = 8V
6 12 18 24 30 36 42 48 54 60 66
I_OUT (A)
FIGURE 1. SIMPLIFIED APPLICATION CIRCUIT
FIGURE 2. LOAD LINE REGULATION
May 9, 2013
FN8315.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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