LX1662CD Просмотр технического описания (PDF) - Microsemi Corporation
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LX1662CD Datasheet PDF : 15 Pages
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THE INFINITE POWER OF INNOVATION
Not Recommended For New Design
LX1662 / 62A, LX1663 /63A
SINGLE-CHIP PROGRAMMABLE PWM CONTROLLERS WITH 5-BIT DAC
PRODUCTION DATA SHEET
DESCRIPTION
The LX1662/62A and LX1663/63A are
Monolithic Switching Regulator Controller
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 without
Expensive Current Sense Resistors. Current-
sensing mechanism can use PCB trace resistance
or the parasitic resistance of the main inductor.
The LX1662A and LX1663A have reduced current
sense comparator threshold for optimum
performance using a PCB trace. For applications
requiring a high degree of accuracy, a
conventional sense resistor can be used to sense
current.
Programmable Synchronous Rectifier 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-synchronous operation).
Smallest Package Size. The LX1662 is available
in a narrow body 14-pin surface mount IC
package for space sensitive applications. The
LX1663 provides the additional functions of
Over Voltage Protection (OVP) and Power Good
(PWRGD) output drives for applications
requiring output voltage monitoring and
protection functions.
Ultra-Fast Transient Response Reduces
System Cost. The modulated offtime architecture
results in the fastest transient response for a given
inductor, reducing output capacitor requirements,
and reducing the total regulator system cost.
Over-Voltage Protection and Power Good
Flag. The OVP output in the LX1663 &
LX1663A can be used to drive an SCR crowbar
circuit to protect the load in the event of a short-
circuit of the main MOSFET. The LX1663 &
LX1663A also have a logiclevel Power Good
Flag to signal when the output voltage is out of
specified limits.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
5-bit Programmable Output For
CPU Core Supply
No Sense Resistor Required For
Short-Circuit Current Limiting
Designed To Drive Either
Synchronous Or Non-
Synchronous Output Stages
Lowest System Cost Possible
For Price- Sensitive Pentium And
Pentium II Class Applications
Soft-Start Capability
Modulated, Constant Off-Time
Architecture For Fast Transient
Response And Simple System
Design
Available Over-Voltage
Protection (OVP) Crowbar Driver
And Power Good Flag (LX1663
only)
Small, Surface-Mount Packages
KEY FEATURES
Socket 7 Microprocessor
Supplies (including Intel Pentium
Processor, AMDK6TM And
Cyrix® 6x86TM, Gx86TM and
M2TM Processors)
Pentium II and Deschutes
Processor & L2-Cache Supplies
Voltage Regulator Modules
General Purpose DC:DC
Converter Applications
PRODUCT HIGHLIGHT
12V
5V
C3
0.1µF
VID0
VID1
VID2
VID3
VID4
U1
LX1662
1 SS
2 INV
V 3
CC_CORE
4 VID0
5 VID1
6 VID2
7 VID3
VC1 14
TDRV 13
GND 12
BDRV 11
VCC 10
CT 9
VID4 8
14-pin, Narrow Body SOIC
L2
1µH
C5
1µF
Q1
IRL3102
6.3V
1500µF x3
C2
C8
680pF
L1, 2.5µH
R1
Q2
IRL3303
2.5m
6.3V, 1500µF x 3**
** Three capacitors for Pentium
Four capacitors for Pentium II
Supply Voltage VOUT
for CPU Core
C1
TA (°C)
0 to 70
PACKAGE ORDER INFO
Plastic DIP
Plastic DIP
N 14-Pin
N 16-Pin
Plastic SOIC
Plastic SOIC
D 14-Pin
D 16-Pin
RoHS Compliant / Pb-free Transition DC:0503 RoHS Compliant / Pb-free Transition DC:0440
LX1662CN
LX1663CN
LX1662CD
LX1663CD
LX1662ACN
LX1663ACN
LX1662ACD
LX1663ACD
Note: Available in Tape & Reel. Append the letters ‘TR’ to the part number. (i.e. LX1663CD-TR)
Copyright © 1999
Rev. 1.2a,2005-03-09
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
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