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參數(shù)資料
| 型號(hào)： | LX1668CPWT |
| 廠商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Analog IC |
| 中文描述： | 1 A SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | PLASTIC, TSSOP-20 |
| 文件頁(yè)數(shù)： | 1/15頁(yè) |
| 文件大?。?/td> | 371K |
| 代理商： | LX1668CPWT |
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LIN D
OC
#: 1668
LX1668
D E S C R I P T I O N
K E Y F E AT U R E S
I
5-Bit Programmable Output For CPU Core
Supply
I
Internal Fixed 2.5V Low Dropout Regulator
I
Adjustable Linear Regulator Driver
I
Complete Single-Chip Power Solution For
Pentium II Processors
I
No Sense Resistor Required For Short-Circuit
Current Limiting
I
Soft-Start And Hiccup-Mode Current Limiting
Functions
I
Modulated Constant Off-Time Control
Mechanism For Fast Transient Response And
Simple System Design
I
Power Good Flag
I
Over-Voltage Pin & SCR
I
Digital-Compatible Inputs
(Including VID Pins)
I
Output Disable Function Shuts Off PWM While
Keeping 2.5V LDO Active - Compatible With
"Green PC" And "Instant On" Requirements
I
Compatible to VRM8.2 - 8.4 Specifications
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
adjustable linear regulator driver. The LX1668
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.
External Linear Regulator Driver
out-
put can be connected to a MOSFET to provide
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
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.
P R O D U C T H I G H L I G H T
P
ROGRAMMABLE
M
ULTIPLE
O
UTPUT
DC:DC C
ONTROLLER
P
R O D U C T I O N
D
A T A
S
H E E T
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
A P P L I C AT I O N S
I
Pentium II & Pentium III Processor Supplies
I
Voltage Regulator Modules
I
General Purpose And Microprocessor DC:DC
Supplies
Note: All surface-mount packages are available in Tape & Reel, append the letter "T" to part number. (i.e. LX1668CPWT)
PA C K A G E O R D E R I N F O R M AT I O N
Plastic SOWB
20-pin
T
A
(°C)
Plastic TSSOP
20-pin
LX1668CPW
PW
0 to 70
LX1668CDW
Copyright 1999
Rev. 1.0 4/99
1
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
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
.
LX1668
5V
V
1.5V
CPU Core
V
CORE
C2
1500μFx3
Q1
IRL3102
Q2
IRL3303
L1
2.5μH
C1
1500μF x 6
R
2.5m
C8
1μF
R2, 50k
Q3
IRLZ44
C6
330μF
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
VID2
VID1
VID0
VID4
R1, 0
C4
330μF
3.3V
C9
1μF
C3
1μF
12V
C7
1μF
7
6
5
4
3
2
1
11
12
13
14
15
16
17
18
19
20
C5
22μF
V
2.5V
L2
1μH
PWRGD
R3
10k
Q4*
SCR
2N6504
C
SS
0.1μF
3.3V / 5V
*
Q4 optional
OVP crowbar
DW
NOTE:
For current data & package dimensions, visit our web site:
http://www.linfinity.com.
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| LX1669 | PROGRAMMABLE DC : DC CONTROLLER |
| LX1669CD | PROGRAMMABLE DC : DC CONTROLLER |
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| LX1670 | 5 - BIT PROGRAMMABLE VOTAGE REFERENCE |
| LX1670CD | 5 - BIT PROGRAMMABLE VOTAGE REFERENCE |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LX1669 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:PROGRAMMABLE DC : DC CONTROLLER |
| LX1669CD | 功能描述:IC CTRLR DC/DC PROG SW 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| LX1669CDT | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:Current-Mode SMPS Controller |
| LX1670 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:5 - BIT PROGRAMMABLE VOTAGE REFERENCE |
| LX1670CD | 功能描述:IC REF/MON VOLT 5BIT PROG 14SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
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