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LX1665ACDW 반도체 회로 부품 판매점

DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC



Microsemi Corporation 로고
Microsemi Corporation
LX1665ACDW 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
LX1664/64A, LX1665/65A
DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC
PRODUCTION DATA SHEET
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)
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
KEY FEATURES
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-K6TM And Cyrix® 6x86TM, Gx86TM and
M2TM Processors)
I Pentium II and Deschutes Processor & L2-
Cache Supplies
I Voltage Regulator Modules
PRODUCT HIGHLIGHT
LX1665 IN A PENTIUM II SINGLE-CHIP POWER SUPPLY SOLUTION
C3
0.1µF
VID0
VID1
VID2
VID3
VID4
12V
U1
LX1665
1 SS
2 INV
V3
CC_CORE
4 VID0
5 VID1
6 VID2
7 VID3
8 VID4
9 LFB
VC1 18
TDRV 17
GND 16
BDRV 15
VCC 14
CT 13
OV 12
LDRV 11
PWRGD 10
18-pin
Wide-Body SOIC
F1 20A
5V
L2
1µH
C5
1µF
Q1
IRL3102
Q2
IRL3303
6.3V
1500µF x3
C2
L1
2.5µH
R1
0.0025
Supply Voltage
for CPU Core
VOUT
C1
6.3V, 1500µF x 3**
C8
680pF
Q4
IRLZ44
C9
330µF
** Three capacitors for Pentium
Four capacitors for Pentium II
Supply Voltage
For I/O Chipset or GTL+ Bus
R5 C7
OV 330µF
PWRGD
R6
TA (°C)
PACKAGE ORDER INFORMATION
N
Plastic DIP
16-pin
N
Plastic DIP
18-pin
D
Plastic SOIC
16-pin
DW
Plastic
18-pin
SOIC
Wide
0 to 70
LX1664CN
LX1665CN
LX1664CD
LX1665CDW
LX1664ACN
LX1665ACN
LX1664ACD
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
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1


LX1665ACDW 데이터시트, 핀배열, 회로
PRODUCT DATABOOK 1996/1997
LX1664/64A, LX1665/65A
DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC
PRODUCTION DATA SHEET
D E S C R I P T I O N (con't.)
Smallest Package Size. The LX1664 is
available in a narrow body 16-pin surface
mount IC package for space sensitive appli-
cations. The LX1665 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 re-
duces system cost. The modulated off-
time architecture results in the fastest tran-
sient response for a given inductor, reduc-
ing output capacitor requirements, and re-
ducing the total regulator system cost.
Over-Voltage Protection and Power
Good Flag. The OVP output in the LX1665
& LX1665A 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 LX1665 & LX1665A also have a logic-
level Power Good Flag to signal when the
output voltage is out of specified limits.
DEVICE
LX1664
LX1664A
LX1665
LX1665A
DEVICE SELECTION GUIDE
Packages
OVP and
Current-Sense
Power Good Comp. Thresh. (mV) Optimal Load
16-pin SOIC
& DIP
18-pin SOIC
& DIP
No
Yes
100 Pentium-class (<10A)
60 Pentium II (> 10A)
100 Pentium-class (<10A)
60 Pentium II (> 10A)
PACKAGE PIN OUTS
SS
INV
VCC_CORE
VID0
VID1
VID2
VID3
VID4
1
2
3
4
5
6
7
8
16 VC1
15 TDRV
14 GND
13 BDRV
12 VCC
11 CT
10 LDRV
9 LFB
N PACKAGE — 16-Pin
LX1664/1664A (Top View)
SS
INV
VCC_CORE
VID0
VID1
VID2
VID3
VID4
LFB
1
2
3
4
5
6
7
8
9
18 VC1
17 TDRV
16 GND
15 BDRV
14 VCC
13 CT
12 OV
11 LDRV
10 PWRGD
N PACKAGE — 18-Pin
LX1665/1665A (Top View)
A B S O L U T E M A X I M U M R AT I N G S (Note 1)
Supply Voltage (VC1) .................................................................................................... 25V
Supply Voltage (VCC) .................................................................................................... 15V
Output Drive Peak Current Source (500ns) ............................................................... 1.5A
Output Drive Peak Current Sink (500ns) ................................................................... 1.5A
Input Voltage (SS, INV, VCC_CORE, CT, VID0-VID4) ........................................... -0.3V to 6V
Operating Junction Temperature
Plastic (N, D & DW Packages) ............................................................................. 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. Pin
numbers refer to DIL packages only.
THERMAL DATA
N (16-PIN DIP) PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
N (18-PIN DIP) PACKAGE:
65°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
D PACKAGE:
60°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
DW PACKAGE:
120°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
90°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
SS
INV
VCC_CORE
VID0
VID1
VID2
VID3
VID4
1 16
2 15
3 14
4 13
5 12
6 11
7 10
89
VC1
TDRV
GND
BDRV
VCC
CT
LDRV
LFB
D PACKAGE — 16-Pin
LX1664/1664A (Top View)
SS
INV
VCC_CORE
VID0
VID1
VID2
VID3
VID4
LFB
1
2
3
4
5
6
7
8
9
18 VC1
17 TDRV
16 GND
15 BDRV
14 VCC
13 CT
12 OV
11 LDRV
10 PWRGD
DW PACKAGE — 18-Pin
LX1665/1665A (Top View)
2 Copyright © 1999
Rev. 1.2 11/99




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DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC - Microsemi Corporation