ISL6532A Datasheet, PDF (1/17 Pages) Intersil Corporation – ACPI Regulator/Controller for Dual Channel DDR Memory Systems

®
Data Sheet
May 5, 2008
ISL6532A
FN9099.5
ACPI Regulator/Controller for Dual
Channel DDR Memory Systems
The ISL6532A 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
and integrated LDO to supply V_DDQ with high current during
S0/S1 states and standby current during S3 state. 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. A buffered version of
the V_DDQ/2 reference is provided as V_REF. An LDO
controller is also integrated for AGP core 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. Both the switching
regulator and standby LDO provide 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.
Switching memory core output between the PWM regulator
and the standby LDO during state transitions is
accomplished smoothly via the internal ACPI control
circuitry. The NCH signal provides synchronized switching of
a backfeed blocking switch during the transitions eliminating
the need to route 5V Dual to the memory supply.
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 PGOOD signal
indicates V_TT is within spec and operational.
Each output is monitored for under and overvoltage events.
The switching regulator has overcurrent protection. Thermal
shutdown is integrated.
Ordering Information
PART
PART
NUMBER
MARKING
ISL6532ACR*^, ** ISL 6532ACR
ISL6532ACRZ*^, ** ISL6532 ACRZ
(Note)
TEMP.
RANGE
(°C)
0 to +70
0 to +70
PKG.
PACKAGE DWG. #
28 Ld 6x6 QFN L28.6x6
28 Ld 6x6 QFN L28.6x6
(Pb-free)
ISL6532AIRZ*
(Note)
ISL6532 AIRZ -40 to +85 28 Ld 6x6 QFN L28.6x6
(Pb-free)
*Add “-T” suffix for tape and reel.
**Add “-TK” suffix for tape and reel. Please refer to TB347 for details on
reel specifications
NOTE: These Intersil Pb-free plastic packaged products employ special
Pb-free material sets; molding compounds/die attach materials and 100%
matte tin plate PLUS ANNEAL - e3 termination finish, which is 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.
Features
• Generates 3 Regulated Voltages
- Synchronous Buck PWM Controller with Standby LDO
- 3A Integrated Sink/Source Linear Regulator with
Accurate VDDQ/2 Divider Reference.
- Glitch-free Transitions During State Changes
- LDO Regulator for 1.5V Video and Core voltage
• Acpi Compliant Sleep State Control
• Integrated V_REF Buffer
• PWM Controller Drives Low Cost N-Channel MOSFETs
• 250kHz Constant Frequency Operation
• Tight Output Voltage Regulation
- All Outputs: ±2% Over-Temperature
• 5V or 3.3V Down Conversion
• 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
• QFN Package Option
- QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad
Flat No Leads - Product Outline
- QFN Near Chip Scale Package Footprint; Improves
PCB Efficiency, Thinner in Profile
• 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
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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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