ISL6531CR-T Datasheet

IC型號：
ISL6531CR-T
PDF描述：
Dual 5V Synchronous Buck Pulse-Width Modulator (PWM) Control...
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PDF頁數(shù)：
17頁
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INTERSIL

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ISL6531

Data Sheet

August 11, 2005

FN9053.2

Dual 5V Synchronous Buck Pulse-Width

Modulator (PWM) Controller for DDRAM

Memory V

DDQ

and V

Termination

The ISL6531 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

for signal termination. The ISL6531 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

鹵1%

over temperature

and line voltage variations. V

accurately tracks V

REF

During V2_SD sleep mode, the V

output is maintained by

a low power window regulator.

The ISL6531 provides simple, single feedback loop, voltage-

mode control with fast transient response for the V

DDQ

regulator. The V

regulator features internal compensation

that eases the design. It includes two phase-locked 300kHz

triangle-wave oscillators which are displaced 90

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 ISL6531 protects against overcurrent conditions by

inhibiting PWM operation. The ISL6531 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

voltages for one- and two-

channel DDRAM memory systems

鈥?Excellent voltage regulation

- V

DDQ

= 2.5V

鹵2%

over full operating range

- V

REF

鈰?/div>

DDQ

鹵1%

over full operating range

- V

= V

REF

鹵

30mV

鈥?Supports 鈥楽3鈥?sleep mode

- V

is held at

鈰?/div>

DDQ

via a 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?V

regulator internally compensated

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 Plus Anneal Available (RoHS Compliant)

Applications

鈥?V

DDQ

, V

, and VREF regulation for DDRAM memory

systems

- Main memory in AMD廬 Athlon鈩?and K8鈩? Pentium廬

III, Pentium IV, Transmeta, PowerPC鈩? AlphaPC鈩? and

UltraSparc廬 based computer systems

鈥?High-power tracking DC-DC regulators

Ordering Information

PART NUMBER

ISL6531CB

ISL6531CBZ

(See Note)

ISL6531CR

TEMP

RANGE(

0 to 70

PACKAGE

24 Lead SOIC

(Pb-free)

PKG. DWG. #

M24.3

32 Lead 5x5 QFN L32.5x5

ISL6530/31EVAL1 Evaluation Board

Add 鈥?T鈥?suffix for tape and reel.

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.

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or

1-888-468-3774

Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

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輸入電壓
4.5 V ~ 5.5 V
輸出數(shù)
2
輸出電壓
2.5V
工作溫度
0°C ~ 70°C
安裝類型
表面貼裝
封裝/外殼
32-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝
32-QFN（5x5）
包裝
帶卷 (TR)

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