isl95833b

DATASHEET
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Dual 2+1 PWM Controller for IMVP-7/VR12 CPUs
ISL95833B
Features
The ISL95833B 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, typically for VCORE, incorporates 1
integrated driver and can operate in 2- or 1-phase
configurations. The second VR, typically for graphics, is a
single phase regulator incorporating an 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.
• Serial data bus
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.
• Supports multiple current sensing methods
- Lossless inductor DCR current sensing
- Precision resistor current sensing
The ISL95833B 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 VBOOT voltage,
IMAX, and switching frequency, adjustable overcurrent
protection and separate Power-Good signals.
• Resistor programmable IMAX and switching frequency
(400kHz ~ 600kHz) for both outputs
• Dual outputs:
- Configurable 2- or 1-phase for the 1st output using one
integrated gate driver
- 1-phase for the 2nd output using an integrated gate driver
• R3™ Modulator
- Excellent transient response
- High light load efficiency
• 0.5% system accuracy over-temperature
• Differential remote voltage sensing
• Programmable VBOOT voltage at start-up
• Adaptive body diode conduction time reduction
Applications
• IMVP-7/VR12 compliant computers
VIN
VR2
VIN
0.91
VR1
0.89
ISL6208
DRIVER
0.88
VOUT (V)
ISL95833B
VIN = 19V
0.90
VIN
0.87
0.86
0.85
0.84
0.83
VIN = 12V
0.82
VIN = 8V
0.81
0.80
0
6
12
18
24
30
36
42
48
54
60
66
IOUT (A)
FIGURE 1. SIMPLIFIED APPLICATION CIRCUIT
June 24, 2013
FN8561.0
1
FIGURE 2. LOAD LINE REGULATION
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.
All other trademarks mentioned are the property of their respective owners.
ISL95833B
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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.
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FN8561.0
June 24, 2013