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LX1669CD Datasheet

  • LX1669CD

  • PROGRAMMABLE DC : DC CONTROLLER

  • 14頁

  • MICROSEMI

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LIN D
O C
#:
1669
LX1669
P
ROGRAMMABLE
DC:DC C
ONTROLLER
T
H E
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 LX1669 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 out-
put suitable for powering Pentium
廬
II and
other processors.
Programmable Synchronous Recti-
fier 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鈥檚 pins or from soft-
ware. 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鈥檚 resulting in typical effi-
ciencies of 85 鈥?90%, even with loads in
excess of 10A.
Short-circuit Current Limiting with-
out Expensive Current Sense Resis-
tors.
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 LX1669 is
available in an economical 16-pin narrow
body SOIC package.
K E Y F E AT U R E S
s
5-Bit Programmable Output For CPU Core
Supply
s
Power Solution For Pentium II Processors
s
No Sense Resistor Required For Short-Circuit
Current Limiting
s
Soft-Start And Hiccup-Mode Current
Limiting Functions
s
Modulated Constant Off-Time Control
Mechanism For Fast Transient Response And
Simple System Design
s
Power Good Flag
s
Over-Voltage Pin Can Drive SCR Crowbar Or
Turn Off Signal Silver-Box Power Supply
s
Digital-Compatible Inputs
(Including VID Pins)
A P P L I C AT I O N S
s
Socket 7 Processor Supplies
s
Pentium II Processor Supplies
s
Deschutes CPU & L2-Cache Memory
Supplies
s
Voltage Regulator Modules
s
General Purpose And Microprocessor
DC:DC Supplies
NOTE:
For current data & package dimensions, visit our web site:
http://www.linfinity.com.
PRODUCT HIGHLIGHT
5V
12V
L2,
1碌H
C2
1500碌Fx3
C8
1碌F
C3
1碌F
1
Q1
IRL3102
L1
2.5碌H
Q2
IRL3303
R
SENSE
2.5m鈩?/div>
CPU Core
V
CORE
R3
10k鈩?/div>
TDRV
V
CC12
V
CC5
PWRGD
OVP
VID0
VID1
VID2
PGND
BDRV
AGND
SS/EN
V
FB
V
CORE
VID4
VID3
16
15
14
13
12
11
10
9
2
3
4
5
LX1669
C
SS
0.1碌F
PWRGD
6
7
8
VID4
VID3
VID2
VID1
VID0
SCR
2N6504
Q4*
C1
1500碌F x 6
* Q4 optional OVP crowbar
PA C K A G E O R D E R I N F O
T
A
(擄C)
0 to 70
D
Plastic SOIC
16-pin
LX1669CD
Note: All surface-mount packages are available in Tape & Reel, append the letter "T" to part number. (i.e. LX1669CDT)
Copyright 漏 1999
Rev. 1.0 4/99
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
1

LX1669CD 產(chǎn)品屬性

  • 2,500

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 專用型

  • -

  • 控制器，Intel Pentium? II

  • 5V，12V

  • 2

  • 1.3 V ~ 3.5 V

  • 0°C ~ 70°C

  • 表面貼裝

  • 16-SOIC（0.154"，3.90mm 寬）

  • 16-SOIC

  • 管件

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