庐
ISL6530
Data Sheet
November 15, 2004
FN9052.2
Dual 5V Synchronous Buck Pulse-Width
Modulator (PWM) Controller for DDRAM
Memory V
DDQ
and V
TT
Termination
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 V
DDQ
for powering
DDRAM memory, V
REF
for DDRAM differential signalling,
and V
TT
for signal termination. The ISL6530 integrates all of
the control, output adjustment, monitoring and protection
functions into a single package.
The V
DDQ
output of the converter is maintained at 2.5V
through an integrated precision voltage reference. The V
REF
output is precisely regulated to 1/2 the memory power
supply, with a maximum tolerance of
卤1%
over temperature
and line voltage variations. V
TT
accurately tracks V
REF
.
During V2_SD sleep mode, the V
TT
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 90
o
to minimize interference between the two
PWM regulators. The regulators feature error amplifiers with
a 15MHz gain-bandwidth product and 6V/碌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 V
DDQ
regulator by using the r
DS(ON)
of the upper
MOSFET which eliminates the need for a current sensing
resistor.
Features
鈥?Provides V
DDQ
, V
REF
, and V
TT
voltages for one- and two-
channel DDRAM memory systems
鈥?Excellent voltage regulation
- V
DDQ
= 2.5V
卤2%
over full operating range
- V
REF
= (V
DDQ
梅2) 卤1%
over full operating range
- V
TT
= V
REF
卤
30mV
鈥?Supports 鈥楽3鈥?sleep mode
- V
TT
is held at V
DDQ
梅2
via low power window regulator
to minimize wake-up time
鈥?Fast transient response
- Full 0% to 100% duty ratio
鈥?Operates from +5V input
鈥?Overcurrent fault monitor on VDD
- Does not require extra current sensing element
- Uses MOSFET鈥檚 r
DS(ON)
鈥?Drives inexpensive N-Channel MOSFETs
鈥?Small converter size
- 300kHz fixed frequency oscillator
鈥?24 Lead, SOIC or 32 Lead, 5mm脳5mm QFN
鈥?/div>
Pb-Free Available (RoHS Compliant)
Applications
鈥?V
DDQ
, V
TT
, and VREF regulation for DDRAM memory
systems
- Main Memory in AMD庐 Athlon鈩?and K8鈩? Pentium庐
III, Pentium IV, Transmeta, PowerPC鈩? AlphaPC鈩? and
UltraSparc庐 based computer systems
- Video memory in graphics systems
鈥?High-power tracking DC-DC regulators
Ordering Information
PART NUMBER
ISL6530CB*
ISL6530CBZ*
(See Note)
ISL6530CR*
ISL6530CRZ*
(See Note)
ISL6530EVAL1, 2
TEMP
RANGE(
o
C)
0 to 70
0 to 70
0 to 70
0 to 70
PACKAGE
24 Lead SOIC
24 Lead SOIC
(Pb-free)
32 Lead 5x5 QFN
32 Lead 5x5 QFN
(Pb-free)
PKG.
DWG. #
M24.3
M24.3
L32.5x5
L32.5x5
Evaluation Board
* Add 鈥?T鈥?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.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
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Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright 漏 Intersil Americas Inc. 2003, 2004. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
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