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LX1668CDW-TR

更新时间： 2024-11-11 12:58:11
品牌 Logo 应用领域
美高森美 - MICROSEMI 输出元件控制器
页数 文件大小 规格书
15页 372K
描述
Switching Controller, Current-mode, 1A, 250kHz Switching Freq-Max, PDSO20, ROHS COMPLIANT, PLASTIC, SOWB-20

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LX1668CDW-TR 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：SOIC
包装说明：SOP,针数：20
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.73
其他特性：ALSO REQUIRE 5V AND 12V SUPPLIES模拟集成电路 - 其他类型：SWITCHING CONTROLLER
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：3.5 V最小输入电压：1.3 V
标称输入电压：2 VJESD-30 代码：R-PDSO-G20
JESD-609代码：e3长度：12.75 mm
湿度敏感等级：1功能数量：1
端子数量：20最高工作温度：70 °C
最低工作温度：最大输出电流：1 A
封装主体材料：PLASTIC/EPOXY封装代码：SOP
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：2.95 mm表面贴装：YES
切换器配置：PUSH-PULL最大切换频率：250 kHz
温度等级：COMMERCIAL端子面层：MATTE TIN
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUAL处于峰值回流温度下的最长时间：40
宽度：7.62 mmBase Number Matches：1

LX1668CDW-TR 数据手册

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LIN DOC #: 1668  
LX1668  
PROGRAMMABLE MULTIPLE OUTPUT DC:DC CONTROLLER  
T H E I N F I N I T E P O W E R O F I N N O V A T I O N  
P R O D U C T I O N D A T A S H E E T  
DESCRIPTION  
KEY FEATURES  
■ 5-Bit Programmable Output For CPU Core  
The LX1668 is a Monolithic Switching  
Regulator Controller IC designed to pro-  
vide a low cost, high performance adjustable  
power supply for advanced microprocessors  
and other applications requiring a very fast  
transient response and a high degree of  
accuracy. It provides a programmable  
switching regulator output, together with one  
internal linear low dropout regulator and one  
adjustablelinearregulatordriver. TheLX1668  
offers a triple-output single-chip power sup-  
ply for Pentium® II and other processors.  
Programmable Synchronous Rectifier  
Driver for CPU Core. The main output is  
adjustable from 1.3 to 3.5V using a TTL-  
compatible 5-bit digital code to meet Intel  
specifications. The IC can read the signal  
from a DIP-switch, hardwired to Pentium II  
processor’s pins or from software. The 5-bit  
code adjusts the output voltage between 1.30  
and 2.05V in 50mV increments, and between  
2.0 and 3.5V in 100mV increments. The  
device can drive dual MOSFET’s resulting in  
typical efficiencies of 85 – 90%, even with  
loads in excess of 10A.  
Internal Low Dropout [LDO] Regulator  
provides a fixed 2.5V output for powering the  
clock circuit at up to 250mA.  
Supply  
■ Internal Fixed 2.5V Low Dropout Regulator  
■ Adjustable Linear Regulator Driver  
■ Complete Single-Chip Power Solution For  
Pentium II Processors  
■ No Sense Resistor Required For Short-Circuit  
Current Limiting  
■ Soft-Start And Hiccup-Mode Current Limiting  
Functions  
■ Modulated Constant Off-Time Control  
Mechanism For Fast Transient Response And  
Simple System Design  
External Linear Regulator Driver out-  
putcanbeconnectedtoaMOSFETtoprovide  
a high-current adjustable LDO function suit-  
able for supplying the GTL+ bus circuitry on  
a Pentium II processor motherboard at 1.5V.  
Short-circuit Current Limiting without  
Expensive Current Sense Resistors. The  
current sensing mechanism can use a PCB  
trace resistance or the parasitic resistance of  
the main inductor. For applications requiring  
a high degree of accuracy, a conventional  
sense resistor can be used.  
Ultra-Fast Transient Response Re-  
duces System Cost. The fixed frequency  
modulated off-time architecture results in the  
fastesttransientresponseforagiveninductor.  
SmallPackageSize. TheLX1668isavailable  
in an economical 20-pin wide body SOIC or  
a space-saving 20-pin TSSOP package.  
■ Power Good Flag  
■ Over-Voltage Pin & SCR  
■ Digital-Compatible Inputs (Including VID Pins)  
■ Output Disable Function Shuts Off PWM While  
Keeping 2.5V LDO Active - Compatible With  
"Green PC" And "Instant On" Requirements  
■ Compatible to VRM8.2 - 8.4 Specifications  
APPLICATIONS  
■ Pentium II & Pentium III Processor Supplies  
■ Voltage Regulator Modules  
■ General Purpose And Microprocessor DC:DC  
Supplies  
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.  
PRODUCT HIGHLIGHT  
5V  
L2  
1µH  
12V  
C2  
1500µFx3  
C7  
1µF  
C8  
1µF  
C3  
1µF  
Q1  
IRL3102  
RSENSE  
L1  
2.5µH 2.5mΩ  
CPU Core  
VCORE  
1
2
20  
19  
18  
17  
VOUT2  
2.5V  
TDRV  
VCC12  
VCC5  
VOUT2  
VCC3  
LDRV  
PGND  
BDRV  
AGND  
SS/EN  
VFB  
Q2  
C5  
22µF  
C9  
1µF  
IRL3303  
3
4
Q4*  
SCR  
16 CSS 0.1µF  
5
3.3V  
C1  
1500µF x 6  
LX1668  
6
15  
14  
13  
12  
11  
2N6504  
VCORE  
C4  
330µF  
7
LFB  
PWRGD  
OVP  
PWRGD  
Q3  
IRLZ44  
8
VID0  
VID1  
VID2  
VOUT3  
1.5V  
9
VID4  
C6  
330µF  
10  
VID4  
VID3  
VID2  
VID1  
VID0  
R3  
R1, 0  
VID3  
*
Q4 optional  
10k  
OVP crowbar  
R2, 50k  
3.3V / 5V  
PACKAGE ORDER INFORMATION  
Plastic SOWB  
20-pin  
Plastic TSSOP  
20-pin  
TA (°C)  
DW  
PW  
0 to 70  
LX1668CDW  
LX1668CPW  
Note: All surface-mount packages are available in Tape & Reel, append the letter "T" to part number. (i.e. LX1668CPWT)  
L I N F I N I T Y M I C R O E L E C T R O N I C S I N C .  
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570  
Copyright © 1999  
Rev. 1.0 4/99  
1
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