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Renesas Electronics Components Datasheet

ISL6530 Datasheet

Dual 5V Synchronous Buck Pulse-Width Modulator (PWM) Controller

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NOT RECOMMENDED FOR NEW DESIGNS
DATASHEETNO RECOMMENDED REPLACEMENT
contact our Technical Support Center at
ISL6530
1-888-INTERSIL or www.intersil.com/tsc
FN9052
Dual 5V Synchronous Buck Pulse-Width Modulator (PWM) Controller for DDRAM
Rev 2.00
Memory VDDQ and VTT Termination
Nov 15, 2004
The ISL6530 provides complete control and protection for
dual DC-DC converters optimized for high-performance
DDRAM memory applications. It is designed to drive low
cost N-channel MOSFETs in synchronous-rectified buck
topology to efficiently generate 2.5V VDDQ for powering
DDRAM memory, VREF for DDRAM differential signalling,
and VTT for signal termination. The ISL6530 integrates all of
the control, output adjustment, monitoring and protection
functions into a single package.
The VDDQ output of the converter is maintained at 2.5V
through an integrated precision voltage reference. The VREF
output is precisely regulated to 1/2 the memory power
supply, with a maximum tolerance of 1% over temperature
and line voltage variations. VTT accurately tracks VREF.
During V2_SD sleep mode, the VTT output is maintained by
a low power window regulator.
The ISL6530 provides simple, single feedback loop, voltage-
mode control with fast transient response. It includes two
phase-locked 300kHz triangle-wave oscillators which are
displaced 90o to minimize interference between the two
PWM regulators. The regulators feature error amplifiers with
a 15MHz gain-bandwidth product and 6V/s slew rate which
enables high converter bandwidth for fast transient
performance. The resulting PWM duty ratio ranges from 0%
to 100%.
The ISL6530 protects against over-current conditions by
inhibiting PWM operation. The ISL6530 monitors the current
in the VDDQ regulator by using the rDS(ON) of the upper
MOSFET which eliminates the need for a current sensing
resistor.
Ordering Information
PART NUMBER
ISL6530CB*
ISL6530CBZ*
(See Note)
ISL6530CR*
ISL6530CRZ*
(See Note)
ISL6530EVAL1, 2
TEMP
RANGE(oC)
PACKAGE
PKG.
DWG. #
0 to 70 24 Lead SOIC
M24.3
0 to 70
24 Lead SOIC
(Pb-free)
M24.3
0 to 70 32 Lead 5x5 QFN L32.5x5
0 to 70
32 Lead 5x5 QFN L32.5x5
(Pb-free)
Evaluation Board
* Add “-T” suffix for tape and reel option.
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-020C.
Features
• Provides VDDQ, VREF, and VTT voltages for one- and
two-channel DDRAM memory systems
• Excellent voltage regulation
- VDDQ = 2.5V 2% over full operating range
- VREF = (VDDQ2) 1% over full operating range
- VTT = VREF 30mV
• Supports ‘S3’ sleep mode
- VTT is held at VDDQ2 via low power window regulator
to minimize wake-up time
• Fast transient response
- Full 0% to 100% duty ratio
• Operates from +5V input
• Overcurrent fault monitor on VDD
- Does not require extra current sensing element
- Uses MOSFET’s rDS(ON)
• Drives inexpensive N-Channel MOSFETs
• Small converter size
- 300kHz fixed frequency oscillator
• 24 Lead, SOIC or 32 Lead, 5mm5mm QFN
Pb-Free Available (RoHS Compliant)
Applications
• VDDQ, VTT, and VREF regulation for DDRAM memory
systems
- Main Memory in AMD® Athlon™ and K8™, Pentium®
III, Pentium IV, Transmeta, PowerPC™, AlphaPC™,
and UltraSparc® based computer systems
- Video memory in graphics systems
• High-power tracking DC-DC regulators
FN9052 Rev 2.00
Nov 15, 2004
Page 1 of 18


Renesas Electronics Components Datasheet

ISL6530 Datasheet

Dual 5V Synchronous Buck Pulse-Width Modulator (PWM) Controller

No Preview Available !

ISL6530
Pinouts
24 LEAD (SOIC)
TOP VIEW
UGATE1 1
BOOT1 2
PHASE1 3
VREF 4
FB1 5
COMP1 6
SENSE1 7
VREF_IN 8
GNDA 9
PHASE2 10
BOOT2 11
UGATE2 12
24 PGND1
23 LGATE1
22 PVCC1
21 OCSET/SD
20 V2_SD
19 PGOOD
18 COMP2
17 SENSE2
16 FB2
15 VCC
14 LGATE2
13 PGND2
32 LEAD (QFN)
TOP VIEW
32 31 30 29 28 27 26 25
PHASE 1 1
24 PVCC1
VREF 2
23 OCSET/SD
FB1 3
22 V2_SD
COMP1 4
21 PGOOD
SENSE1 5
20 COMP2
VREF_IN 6
19 SENSE2
GNDA 7
18 FB2
GNDA 8
17 VCC
9 10 11 12 13 14 15 16
FN9052 Rev 2.00
Nov 15, 2004
Page 2 of 18


Part Number ISL6530
Description Dual 5V Synchronous Buck Pulse-Width Modulator (PWM) Controller
Maker Renesas
Total Page 18 Pages
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