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Renesas Electronics Components Datasheet

ISL6537A Datasheet

ACPI Regulator/Controller

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DATASHEET
ISL6537A
ACPI Regulator/Controller for Dual Channel DDR Memory Systems
FN9143
Rev 5.00
Jul 18, 2007
The ISL6537A 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 VDDQ during S0/S1 and S3 states. During S0/S1 state,
a fully integrated sink-source regulator generates an accurate
(VDDQ/2) high current VTT voltage without the need for a
negative supply. A buffered version of the VDDQ/2 reference is
provided as VREF. A second PWM controller, which requires
external MOSFET drivers, is available for regulation of the
GMCH Core voltage. An LDO controller is also integrated for
the CPU VTT termination voltage regulation and the DAC.
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 and CPU VTT termination voltage
is within spec and operational.
All outputs, except VDAC, have undervoltage protection.
The switching regulator also has overvoltage and
overcurrent protection. Thermal shutdown is integrated.
Pinout
ISL6537A (6X6 QFN)
TOP VIEW
28 27 26 25 24 23 22
5VSBY 1
21 DRIVE3
S3# 2
20 FB3
P12V 3
GND 4
DDR_VTT 5
GND
29
19 PWM4
18 FB4
17 COMP4
DDR_VTT 6
16 COMP
VDDQ 7
15 FB
8 9 10 11 12 13 14
Features
• Generates 5 Regulated Voltages
- Synchronous Buck PWM Controller for DDR VDDQ
- 3A Integrated Sink/Source Linear Regulator with
Accurate VDDQ/2 Divider Reference for DDR VTT
- PWM Regulator for GMCH Core
- LDO Regulator for CPU/GMCH VTT Termination
- LDO Regulator for DAC
• ACPI Compliant Sleep State Control
• Glitch-Free Transitions During State Changes
• Integrated VREF Buffer
• VDDQ PWM Controller Drives Low Cost N-Channel
MOSFETs
• 250kHz Constant Frequency Operation
- Both PWM Controllers are Phase Shifted 180°
• 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
• OCP on the VDDQ Switching Regulator
• Integrated Thermal Shutdown Protection
• Pb-Free Plus Anneal 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
FN9143 Rev 5.00
Jul 18, 2007
Page 1 of 16


Renesas Electronics Components Datasheet

ISL6537A Datasheet

ACPI Regulator/Controller

No Preview Available !

ISL6537A
Ordering Information
PART NUMBER
ISL6537ACR
ISL6537ACRZ (Note)
PART MARKING
ISL6537ACR
ISL6537ACRZ
TEMPERATURE
RANGE (°C)
0 to +70
0 to +70
PACKAGE
28 Ld 6x6 QFN
28 Ld 6x6 QFN (Pb-free)
PKG.
DWG. #
L28.6x6
L28.6x6
ISL6537ACRZA (Note)
ISL6537ACRZ
0 to +70
28 Ld 6x6 QFN (Pb-free)
L28.6x6
*Add “-T” suffix to part number for tape and reel packaging.
NOTE: Intersil Pb-free plus anneal 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.
FN9143 Rev 5.00
Jul 18, 2007
Page 2 of 16


Part Number ISL6537A
Description ACPI Regulator/Controller
Maker Renesas
Total Page 16 Pages
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