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Renesas Electronics Components Datasheet

ISL6277 Datasheet

Multiphase PWM Regulator

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DATASHEETISL6277
Multiphase
PWM
Regulator
for
AMD
Fusion™
MobileNCROEPTCUROsEMIUNCMsTOEiEnMNRgMDSSEEILVNDPIDRA2EE.RD0PTFLIOASRCL6EN2ME7E7WANDT EPSAIRGTNS
FN8270
Rev 1.00
Mar 8, 2012
The ISL6277 is fully compliant with AMD Fusion™ SVI 2.0 and
provides a complete solution for microprocessor and graphics
processor core power. The ISL6277 controller supports two
Voltage Regulators (VRs) with three integrated gate drivers and
two optional external drivers for maximum flexibility. The Core VR
can be configured for 3-, 2-, or 1-phase operation while the
Northbridge VR supports 2- or 1-phase configurations. The two
VRs share a serial control bus to communicate with the AMD CPU
and achieve lower cost and smaller board area compared with
two-chip solutions.
The PWM modulator is based on Intersil’s Robust Ripple
Regulator R3 Technology™. Compared to traditional modulators,
the R3 modulator can automatically change switching frequency
for faster transient settling time during load transients and
improved light load efficiency.
The ISL6277 has several other key features. Both outputs
support DCR current sensing with single NTC thermistor for
DCR temperature compensation or accurate resistor current
sensing. Both outputs utilize remote voltage sense, adjustable
switching frequency, OC protection and power good.
Applications
• AMD Fusion CPU/GPU Core Power
• Notebook Computers
Features
• Supports AMD SVI 2.0 Serial Data Bus Interface
• Dual Output Controller with Integrated Drivers
- Two Dedicated Core Drivers
- One Programmable Driver for Either Core or Northbridge
• Precision Voltage Regulation
- 0.5% System Accuracy Over-Temperature
- 0.5V to 1.55V in 6.25mV 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 Slew Rate
• Programmable VID Offset and Droop on Both Outputs
• Programmable Switching Frequency for Both Outputs
• Excellent Dynamic Current Balance Between Phases
• OCP/WOC, OVP, PGOOD, and Thermal Monitor
• Small Footprint 48 Ld 6x6 QFN Package
- Pb-Free (RoHS Compliant)
Core Performance
100
90
80
70
60
50
40
30
20
10
0
0
VIN = 12V
VIN = 19V
VIN = 8V
VOUT CORE = 1.1V
5 10 15 20 25 30 35 40 45 50 55
IOUT (A)
FIGURE 1. EFFICIENCY vs LOAD
1.12
1.10
1.08
1.06
1.04
1.02
VIN = 12V
VIN = 8V
1.00
VIN = 19V
0.98 VOUT CORE = 1.1V
0.96 0 5 10 15 20 25 30 35 40 45 50 55
IOUT (A)
FIGURE 2. VOUT vs LOAD
FN8270 Rev 1.00
Mar 8, 2012
Page 1 of 37


Renesas Electronics Components Datasheet

ISL6277 Datasheet

Multiphase PWM Regulator

No Preview Available !

ISL6277
Simplified Application Circuit for High Power CPU Core
NB_PH1
NB_PH2
VNB1
VNB2
NB_PH1
NB_PH2
VNB_SENSE
VCORE_SENSE
PH1
PH2
PH3
VO1
VO2
VO3
Ri
Cn
NTC
ISEN1_NB
ISEN2_NB
ISUMN_NB
ISUMP_NB
BOOTX
UGATEX
PHASEX
LGATEX
FCCM_NB
VIN
NB_PH1
VIN
VNB1
VNB
PWM2_NB
COMP_NB
FB_NB
VSEN_NB
PWROK
SVT
µP SVD
SVC
VDDIO
IMON_NB
NTC_NB
VR_HOT_L
IMON
NTC
PWM_Y
COMP
FB2
FB
VSEN
RTN
ISEN1
ISEN2
ISEN3
Ri
Cn
NTC
ISUMN
ISUMP
ISL6277
BOOT2
UGATE2
PHASE2
LGATE2
BOOT1
UGATE1
PHASE1
LGATE1
NB_PH2
THERMAL INDICATOR
VIN
PH3
VIN
PH2
VIN
PH1
VNB2
VO3
VCORE
VO2
VO1
FN8270 Rev 1.00
Mar 8, 2012
FIGURE 3. TYPICAL APPLICATION CIRCUIT USING INDUCTOR DCR SENSING
Page 2 of 37


Part Number ISL6277
Description Multiphase PWM Regulator
Maker Renesas
PDF Download

ISL6277 Datasheet PDF






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