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LX1668CDW 반도체 회로 부품 판매점

PROGRAMMABLE MULTIPLE OUTPUT DC:DC CONTROLLER



Microsemi Corporation 로고
Microsemi Corporation
LX1668CDW 데이터시트, 핀배열, 회로
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 #: 1668
LX1668
P ROGRAMMABLE MULTIPLE OUTPUT DC:DC CONTROLLER
PR O D U C T I O N D ATA S H E E T
DESCRIPTION
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.
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 Internal Fixed 2.5V Low Dropout Regulator
s Adjustable Linear Regulator Driver
s Complete Single-Chip 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 & SCR
s Digital-Compatible Inputs (Including VID Pins)
s Output Disable Function Shuts Off PWM While
Keeping 2.5V LDO Active - Compatible With
"Green PC" And "Instant On" Requirements
s Compatible to VRM8.2 - 8.4 Specifications
A P P L I C AT I O N S
s Pentium II & Pentium III Processor Supplies
s Voltage Regulator Modules
s General Purpose And Microprocessor DC:DC
Supplies
PRODUCT HIGHLIGHT
5V
12V
C8 C3
1µF 1µF
VOUT2
2.5V
C5
22µF
C9
1µF
3.3V
VOUT3
1.5V
C4
330µF
C6
330µF
Q3
IRLZ44
R1, 0
R2, 50k
L2
1µH
C7
1µF
1 TDRV
PGND 20
2 VCC12
BDRV 19
3 VCC5
AGND 18
LX16684 VOUT2
5 VCC3
6 LDRV
SS/EN
VFB
17
16 CSS
VCORE 15
7 LFB
PWRGD 14
8 VID0
OVP 13
9 VID1
VID4 12
10 VID2
VID3 11
Q1
IRL3102
0.1µF
C2
1500µFx3
L1 RSENSE
2.5µH 2.5m
Q2
IRL3303
PWRGD
Q4*
SCR
2N6504
VID4
VID3
VID2
VID1
VID0
R3
10k
3.3V / 5V
CPU Core
VCORE
C1
1500µF x 6
* Q4 optional
OVP crowbar
PACKAGE ORDER INFORMATION
TA (°C)
DW
Plastic
20-pin
SOWB
PW
Plastic
20-pin
TSSOP
0 to 70
LX1668CDW
LX1668CPW
Note: All surface-mount packages are available in Tape & Reel, append the letter "T" to part number. (i.e. LX1668CPWT)
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


LX1668CDW 데이터시트, 핀배열, 회로
PRODUCT DATABOOK 1996/1997
LX1668
P ROGRAMMABLE MULTIPLE OUTPUT DC:DC CONTROLLER
PRODUCTION DATA SHEET
A B S O L U T E M A X I M U M R AT I N G S (Note 1 & 2)
12V Supply Voltage (VCC12) .................................................................................. 18V
5V Supply Voltage (VCC5) ....................................................................................... 7V
Supply Voltage (Internal LDO)/(VCC3) ................................................................... 7V
Output Drive Peak Current Source (500ns) ....................................................... 1.0A
Output Drive Peak Current Sink (500ns) ........................................................... 1.0A
Input Voltage (SS, VID[0:4]) ................................................................... -0.3V to 6V
Operating Junction Temperature .................................................................... 150°C
Storage Temperature Range ........................................................... -65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) .................................................... 300°C
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with
respect to Ground. Currents are positive into, negative out of the specified
terminal.
Note 2. VCC3 supply is used as input to internal low dropout regulator. Voltages above
3.3V will cause increased thermal dissipation in the package. Power dissipation
should be limited to keep junction temperature below maximum rating.
T H E R MAL DATA
DW PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
PW PACKAGE:
85°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
110°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow.
PACKAGE PIN OUTS
TDRV
1
20 PGND
VCC12
VCC5
VOUT2
VCC3
LDRV
LFB
VID0
2
3
4
5
6
7
8
19 BDRV
18 AGND
17 SS/ENABLE
16 VFB
15 VCORE
14 PWRGD
13 OVP
VID1
9
12 VID4
VID2 10 11 VID3
DW PACKAGE — 20-Pin
(Top View)
TDRV
VCC12
VCC5
VOUT2
VCC3
LDRV
LFB
VID0
VID1
VID2
1
2
3
4
5
6
7
8
9
10
20 PGND
19 BDRV
18 AGND
17 SS/ENABLE
16 VFB
15 VCORE
14 PWRGD
13 OVP
12 VID4
11 VID3
PW PACKAGE — 20-Pin
(Top View)
2 Copyright © 1999
Rev. 1.0 4/99




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LX1668CDW controller

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PROGRAMMABLE MULTIPLE OUTPUT DC:DC CONTROLLER - Microsemi Corporation