ISL6548 Datasheet, PDF (1/15 Pages) Intersil Corporation – ACPI Regulator/Controller for Dual Channel DDR Memory Systems

®
Data Sheet
February 9, 2005
ISL6548
FN9188.1
ACPI Regulator/Controller for
Dual Channel DDR Memory Systems
The ISL6548 provides a complete ACPI compliant power
solution for up to 4 DIMM dual channel DDR/DDR2 Memory
systems. Included are both a synchronous buck controller to
supply V_DDQ during S0/S1 and S3 states. During S0/S1
state, a fully integrated sink-source regulator generates an
accurate (V_DDQ/2) high current V_TT voltage without the
need for a negative supply. Two LDO controllers are also
integrated for the GMCH core voltage regulation and for the
GMCH/CPU V_TT termination voltage regulation.
The switching PWM controller drives two N-Channel
MOSFETs in a synchronous-rectified buck converter
topology. The synchronous buck converter uses voltage-
mode control with fast transient response. The switching
regulator provides a maximum static regulation tolerance of
±2% over line, load, and temperature ranges. The output is
user-adjustable by means of external resistors down to 0.8V.
An integrated soft-start feature brings all outputs into
regulation in a controlled manner when returning to S0/S1
state from any sleep state. During S0 the VIDPGD signal
indicates that the GMCH/CPU V_TT termination voltage is
within spec and operational.
Each output is monitored for undervoltage events. The
switching regulator also has overvoltage and overcurrent
protection. Thermal shutdown is integrated.
Pinout
ISL6548 (6x6 QFN)
TOP VIEW
28 27 26 25 24 23 22
5VSBY 1
21 DRIVE4
S3# 2
20 REFADJ4
P12V 3
GND 4
DDR_VTT 5
GND
29
19 DRIVE3
18 FB3
17 FB4
DDR_VTT 6
16 COMP
VDDQ 7
15 FB
8 9 10 11 12 13 14
Features
• Generates 4 Regulated Voltages
- Synchronous Buck PWM Controller for DDR V_DDQ
- 3A Integrated Sink/Source Linear Regulator with
Accurate VDDQ/2 Divider Reference for DDR V_TT
- LDO Regulator for GMCH Core
- Sink/Source LDO Regulator for CPU/GMCH V_TT
Termination
• ACPI compliant sleep state control
• Glitch-free Transitions During State Changes
• PWM Controller Drives Low Cost N-Channel MOSFETs
• 250kHz Constant Frequency Operation
• Tight Output Voltage Regulation
- All Outputs: ±2% Over Temperature
• Fully-Adjustable Outputs with Wide Voltage Range: Down
to 0.8V supports DDR and DDR2 Specifications
• Simple Single-Loop Voltage-Mode PWM Control Design
• Fast PWM Converter Transient Response
• Under and Overvoltage Monitoring on All Outputs
• OCP on the Switching Regulator
• Integrated Thermal Shutdown Protection
• Pb-Free Available (RoHS Compliant)
Applications
• _{Single and Dual Channel DDR Memory Power Systems in}
ACPI compliant PCs
• _{Graphics cards - GPU and memory supplies}
• ASIC power supplies
• Embedded processor and I/O supplies
• DSP supplies
Ordering Information
TEMP.
PART NUMBER RANGE (°C)
PACKAGE
PKG.
DWG. #
ISL6548CRZ
(Note)
0 to 70 28 Ld 6x6 QFN (Pb-free) L28.6x6
ISL6548CRZ-T
(Note)
0 to 70 28 Ld 6x6 QFN
L28.6x6
Tape and Reel (Pb-free)
ISL6548CRZ A
(Note)
0 to 70 28 Ld 6x6 QFN (Pb-free) L28.6x6
ISL6548CRZA-T
(Note)
0 to 70 28 Ld 6x6 QFN
L28.6x6
Tape and Reel (Pb-free)
NOTE: Intersil Pb-free products employ special Pb-free material sets; molding
compounds/die attach materials and 100% matte tin plate termination finish, which are
RoHS compliant and compatible with both SnPb and Pb-free soldering operations.
Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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