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参数资料
| 型号： | LX1668CDW-TR |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | ROHS COMPLIANT, PLASTIC, SOWB-20 |
| 文件页数： | 1/15页 |
| 文件大小： | 392K |
| 代理商： | LX1668CDW-TR |
P RODU C T ION D AT A S HEET
T HE
I NFI N ITE
P O W ER
OF
I N NOVATIO N
L IN F IN IT Y M IC ROEL E C TRON IC S I NC .
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
Copyright
1999
Rev. 1.0a,2005-03-01
LX1668
PROGRAMMABLE MULTIPLE OUTPUT DC : DC CONTROLLER
DESCRI PTI O N
The LX1668 is a Monolithic Switching
Regulator
Controller
IC
designed
to
provide
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 adjustable linear regulator
driver. The LX1668 offers a triple-output
single-chip power supply 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
TTLcompatible 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.
External Linear Regulator Driver output
can be connected to a MOSFET to provide a
high-current
adjustable
LDO
function
suitable
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 Reduces
System
Cost.
The
fixed
frequency
modulated off-time architecture results in
the fastest transient response for a given
inductor.
Small Package Size. The LX1668 is
available in an economical 20-pin wide
body SOIC or a space-saving 20-pin TSSOP
package.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATUR ES
5-Bit Programmable Output For
CPU Core 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
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
KEY FEATUR ES
Pentium II & Pentium III
Processor Supplies
Voltage Regulator Modules
General Purpose And
Microprocessor DC:DC Supplies
PRODUCT H I GHLIGHT
LX1668
5V
V
OUT3
1.5V
CPU Core
V
CORE
C2
1500Fx3
Q1
IRL3102
Q2
IRL3303
L1
2.5H
C1
1500F x 6
R
SENSE
2.5m
C8
1F
R2, 50k
Q3
IRLZ44
C6
330F
TDRV
V
CC12
V
CC5
V
OUT2
V
CC3
L
DRV
L
FB
VID0
VID1
VID2
10
PGND
BDRV
AGND
SS/EN
V
FB
V
CORE
PWRGD
OVP
VID4
VID3
9
8
VID3
VID4
VID2
VID1
VID0
R1, 0
C4
330F
3.3V
C9
1F
C3
1F
12V
C7
1F
7
6
5
4
3
2
1
11
12
13
14
15
16
17
18
19
20
C5
22F
V
OUT2
2.5V
L2
1H
PWRGD
R3
10k
Q4*
SCR
2N6504
C
SS
0.1F
3.3V / 5V
* Q4 optional
OVP crowbar
PACKAGE ORDER INFO
DW
Plastic SOWB
20-Pin
PW
Plastic TSSOP
20-Pin
TA (
°C)
RoHS Compliant / Pb-free
Transition DC: 0516
RoHS Compliant / Pb-free
Transition DC: 0442
0 to 70
LX1668CDW
LX1668CPW
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX1668CDW-TR)
O
B
SO
LETE
PRO
D
UCT
NOT
RECOMMENDED
FOR
NEW
DESIGNS
相关PDF资料 |
PDF描述 |
|---|---|
| LX1668CPW-TR | 1 A SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO20 |
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| LX1671CPW-TR | 1 A SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO38 |
| LX1672-05CPWTR | 1 A DUAL SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, PDSO28 |
| LX1672-03CLQTR | 1 A DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PQCC38 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LX1668CPW | 功能描述:IC CTRLR DC/DC PROG SW 20TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| LX1668CPWT | 制造商:MICROSEMI 制造商全称:Microsemi Corporation 功能描述:Analog IC |
| LX1669 | 制造商:MICROSEMI 制造商全称:Microsemi Corporation 功能描述:PROGRAMMABLE DC : DC CONTROLLER |
| LX1669CD | 功能描述:IC CTRLR DC/DC PROG SW 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| LX1669CDT | 制造商:MICROSEMI 制造商全称:Microsemi Corporation 功能描述:Current-Mode SMPS Controller |
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