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Microsemi Corporation - PROGRAMMABLE DC : DC CONTROLLER

Numéro de référence LX1669CD
Description PROGRAMMABLE DC : DC CONTROLLER
Fabricant Microsemi Corporation 
Logo Microsemi Corporation 





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LX1669CD fiche technique
T H E I N F I N I T E P O W E R O F I N N O VAT I O N
L I N D O C #: 1669
LX1669
PROGRAMMABLE DC:DC CONTROLLER
PR O D U C T I O N D ATA 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® 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’s 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’s resulting in typical effi-
ciencies of 85 – 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.
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
KEY FEATURES
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
5V 12V
C8 C3
1µF 1µF
R3
10k
PWRGD
PRODUCT HIGHLIGHT
1 TDRV
2 VCC12
3 VCC5
4 PWRGD
5 OVP
6 VID0
7 VID1
8 VID2
L2, 1µH
Q1
IRL3102
PGND 16
BDRV 15
AGND
SS/EN
14
13
CSS
VFB 12 0.1µF
VCORE 11
VID4 10
VID3 9
VID4
VID3
VID2
VID1
VID0
C2
1500µFx3
L1 RSENSE
2.5µH 2.5m
Q2
IRL3303
Q4*
SCR
2N6504
CPU Core
VCORE
C1
1500µF x 6
PACKAGE ORDER INFO
* Q4 optional OVP crowbar
TA (°C)
D
Plastic SOIC
16-pin
0 to 70
LX1669CD
Note: All surface-mount packages are available in Tape & Reel, append the letter "T" to part number. (i.e. LX1669CDT)
Copyright © 1999
Rev. 1.0 4/99
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1

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