ISL6267 Datasheet, PDF (1/33 Pages) Intersil Corporation – Multiphase PWM Regulator for AMD Fusion Mobile CPUs

Multiphase PWM Regulator for AMD Fusion™ Mobile
CPUs
ISL6267
The ISL6267 is designed to be completely compliant with AMD
Fusion™ specifications. The ISL6267 controls two Voltage
Regulators (VRs) with three integrated gate drivers. The first VR
can be configured as 3-, 2-, or 1-phase VR, while the second
output can be configured as 2- or 1-phase VR, providing
maximum flexibility. The two VRs share the serial control bus to
communicate with the CPU and achieve lower cost and smaller
board area compared with two-chip solutions.
The PWM modulator of ISL6267 is based on Intersil’s R3 (Robust
Ripple Regulator) Technology™. Compared with the traditional
multi-phase buck regulator, the R3 modulator commands
variable switching frequency during load transients, achieving
faster transient response. With the same modulator, it naturally
goes into pulse frequency modulation in light load conditions,
which achieves higher light load efficiency and extends battery
life.
The ISL6267 has several other key features. Both outputs
support DCR current sensing with a single NTC thermistor for
DCR temperature compensation or accurate resistor current
sensing. Both outputs come with remote voltage sense,
adjustable switching frequency, current monitor, OC
protection, independent power-good indicators, temperature
monitors, and a common thermal alert.
Applications
• AMD Fusion CPU/GPU Core Power
• Notebook Computers
Features
• Supports AMD SVI 1.0 Serial Data Bus Interface
• Dual Output Controller with Integrated Drivers
- Core VR Configurable 3-, 2-, 1-Phase with Two Integrated
Drivers
- Northbridge VR Configurable 2- or 1-Phase with One
Integrated Driver
• Precision Voltage Regulation
- 0.5% System Accuracy Over-Temperature
- 0V to 1.55V in 12.5mV Steps
- Enhanced Load Line Accuracy
• Supports Multiple Current Sensing Methods
- Lossless Inductor DCR Current Sensing
- Precision Resistor Current Sensing
• Programmable 1-, 2- or 3-Phase for the Core Output and 1-
or 2-Phase for the Northbridge Output
• Adaptive Body Diode Conduction Time Reduction
• Superior Noise Immunity and Transient Response
• Output Current Monitor and Thermal Monitor
• Differential Remote Voltage Sensing
• High Efficiency Across Entire Load Range
• Programmable +VID Offset for Both Core and NB
• Programmable Switching Frequency for Both Outputs
• Excellent Dynamic Current Balance Between Phases
• OCP/WOC, OVP, PGOOD, and Thermal Monitor
• Small Footprint 48 Ld 6x6 TQFN Package
• Pb-Free (RoHS Compliant)
Core Performance on ISL6267EVAL1Z
100
90
80
70
60
50
40
30
20
10
0
0
V_IN = 12V
V_IN = 19V
V_IN = 8V
V_OUT CORE = 1.1V
5 10 15 20 25 30 35 40 45 50 55
I_OUT (A)
FIGURE 1. EFFICIENCY vs LOAD
1.12
1.10
1.08
1.06
1.04
1.02
V_IN = 12V
V_IN = 8V
1.00
V_IN = 19V
0.98 _{VOUT CORE = 1.1V}
0.96 _{0 5 10 15 20 25 30 35 40 45 50 55}
I_OUT (A)
FIGURE 2. V_OUT vs LOAD
FN7801.0
1
January 31, 2011
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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