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LX1664CD 参数 Datasheet PDF下载

LX1664CD图片预览
型号: LX1664CD
PDF下载: 下载PDF文件 查看货源
内容描述: 5位DAC双输出PWM控制器 [DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC]
分类和应用: 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管输出元件
文件页数/大小: 17 页 / 353 K
品牌: MICROSEMI [ MICROSEMI CORPORATION ]
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LX1664/64A, LX1665/65A
D
UAL
O
UTPUT
PWM C
ONTROLLERS
T
H E
WITH
5-B
IT
DAC
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
P
R O D U C T I O N
D
A T A
S
H E E T
DESCRIPTION
The LX1664/64A and LX1665/65A are
monolithic switching regulator con-
troller IC’s
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.
Short-circuit Current Limiting with-
out Expensive Current Sense Resistors.
Current-sensing mechanism can use PCB
trace resistance or the parasitic resistance of
the main inductor. The
LX1664A
and
LX1665A
have reduced current sense com-
parator threshold for optimum perfor-
mance using a sense resistor. For applica-
tions requiring a high degree of accuracy, a
conventional sense resistor can be used to
sense current.
Programmable Synchronous Recti-
fier Driver for CPU Core.
The main
output is adjustable from 1.3V to 3.5V using
a 5-bit code. The IC can read a VID signal
set by a DIP switch on the motherboard, or
hardwired into the processor’s package (as
in the case of Pentium
®
Pro and Pentium II
processors). 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, conforming to the
Intel Corporation specification. The device
can drive dual MOSFET’s resulting in typical
efficiencies of 85 - 90% even with loads in
excess of 10 amperes. For cost sensitive
applications, the bottom MOSFET can be
replaced with a Schottky diode (non-syn-
chronous operation).
Linear Regulator Driver.
The LX1664/
65 family of devices have a secondary
regulator output. This can drive a MOSFET
or bipolar transistor as a pass element to
construct a low-cost adjustable linear regu-
lator suitable for powering a 1.5V GTL+ bus
or 2.5V clock supply.
(continued next page)
K E Y F E AT U R E S
I
5-bit Programmable Output For CPU Core
Supply
I
Adjustable Linear Regulator Driver Output
I
No Sense Resistor Required For Short-
Circuit Current Limiting
I
Designed To Drive Either Synchronous Or
Non-Synchronous Output Stages
I
Soft-Start Capability
I
Modulated, Constant Off-Time Architecture
For Fast Transient Response And Simple
System Design
I
Available Over-Voltage Protection (OVP)
Crowbar Driver And Power Good Flag
(LX1665 only)
A P P L I C AT I O N S
I
Socket 7 (Pentium Class) Microprocessor
Supplies (including Intel Pentium Processor,
AMD-K6
TM
And Cyrix
®
6x86
TM
, Gx86
TM
and
M2
TM
Processors)
I
Pentium II and Deschutes Processor & L2-
Cache Supplies
I
Voltage Regulator Modules
IMPORTANT:
For the most current data, consult LinFinity's web site:
http://www.linfinity.com.
PRODUCT HIGHLIGHT
LX1665
IN A
P
E N T I U M
I I S
I N G L E
-C
H I P
P
O W E R
S
U P P L Y
S
O L U T I O N
F
1
20A
L
2
1µH
Q
1
12V
C
3
0.1µF
1
2
3
5V
6.3V
1500µF x3
C
2
L
1
2.5µH
U1
LX1665
SS
INV
V
CC_CORE
VID0
VID1
VID2
VID3
VID4
L
FB
V
C1
TDRV
GND
BDRV
V
CC
C
T
OV
L
DRV
PWRGD
18
17
16
15
14
13
12
11
10
C
5
1µF
IRL3102
R
1
0.0025
Supply Voltage
for CPU Core
V
OUT
VID0
VID1
VID2
VID3
VID4
4
5
6
7
8
9
Q
2
IRL3303
6.3V, 1500µF x 3**
C
1
C
8
680pF
C
9
330µF
Q
4
IRLZ44
R
5
R
6
** Three capacitors for Pentium
Four capacitors for Pentium II
Supply Voltage
For I/O Chipset or GTL+ Bus
18-pin
Wide-Body SOIC
OV
PWRGD
C
7
330µF
T
A
(°C)
0 to 70
N
Plastic DIP
16-pin
LX1664CN
LX1664ACN
N
Plastic DIP
18-pin
LX1665CN
LX1665ACN
D
Plastic SOIC
16-pin
LX1664CD
LX1664ACD
DW
Plastic SOIC Wide
18-pin
LX1665CDW
LX1665ACDW
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (e.g. LX1664CDT)
Copyright © 1999
Rev. 1.2 11/99
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
Selection Guide
PA C K A G E O R D E R I N F O R M AT I O N
See next page
for
1