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부품번호 LX1665ACN 기능
기능 DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC
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LX1665ACN 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




LX1665ACN pdf, 반도체, 판매, 대치품
PRODUCT DATABOOK 1996/1997
LX1664/64A, LX1665/65A
DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC
PRODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS
Table 1 - Adaptive Transient Voltage Output (Output Voltage Setpoint — Typical)
Processor Pins
0 = Ground, 1 = Open (Floating)
Output Voltage (VCC_CORE)
VID4 VID3 VID2 VID1 VID0
0.0A
Nominal Output*
01111
1.34V
1.30V
01110
1.39V
1.35V
01101
1.44V
1.40V
01100
1.49V
1.45V
01011
1.54V
1.50V
01010
1.59V
1.55V
01001
1.64V
1.60V
01000
1.69V
1.65V
00111
1.74V
1.70V
00110
1.79V
1.75V
00101
1.84V
1.80V
00100
1.89V
1.85V
00011
1.94V
1.90V
00010
1.99V
1.95V
00001
2.04V
2.00V
00000
2.09V
2.05V
11111
2.04V
2.00V
11110
2.14V
2.10V
11101
2.24V
2.20V
11100
2.34V
2.30V
11011
2.44V
2.40V
11010
2.54V
2.50V
11001
2.64V
2.60V
11000
2.74V
2.70V
10111
2.84V
2.80V
10110
2.94V
2.90V
10101
3.04V
3.00V
10100
3.14V
3.10V
10011
3.24V
3.20V
10010
3.34V
3.30V
10001
3.44V
3.40V
10000
3.54V
3.50V
* Nominal = DAC setpoint voltage with no adaptive output voltage positioning.
Note:
Adaptive Transient Voltage Output
In order to improve transient response a 40mV
offset is built into the Current Sense comparator.
At high currents, the peak output voltage will be
lower than the nominal set point, as shown in
Figure 1. The actual output voltage will be a
function of the sense resistor, the output current
and output ripple.
Time - 100µs/Div.
FIGURE 1 — Output Transient Response
(using 5msense resistor and 5µH output inductor)
4 Copyright © 1999
Rev. 1.2 11/99

4페이지










LX1665ACN 전자부품, 판매, 대치품
PRODUCT DATABOOK 1996/1997
LX1664/1664A, LX1665/65A
DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC
PRODUCTION DATA SHEET
Pin
Name
SS
INV
VCC_CORE
VID0
VID1
VID2
VID3
VID4
LX1664
Pin #
1
2
3
4
5
6
7
8
LFB
PWRGD
LDRV
OV
CT
VCC
BDRV
9
N.C.
10
N.C.
11
12
13
GND
TDRV
VC1
14
15
16
LX1665
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
FUNCTIONAL PIN DESCRIPTION
Description
Soft-Start pin, internally connected to the non-inverting input of the error comparator.
Inverting input of the error comparator.
Output voltage. Connected to non-inverting input of the current-sense comparator.
Voltage Identification pin (LSB) input used to set output voltage.
Voltage Identification pin (2nd SB) input.
Voltage Identification pin (3rd SB) input.
Voltage Identification pin (4th SB) input.
Voltage Identification pin (MSB) input. This pin is also the range select pin — when low
(CLOSED), output voltage is set to between 1.30 and 2.05V in 0.05V increments. When high
(OPEN), output is adjusted from 2.0 to 3.5V in 0.1V increments.
Linear regulator feedback pin. 1.5V reference is connected to a resistor divider to set desired
output voltage.
Open collector output pulls low when the output voltage is out of limits.
Linear regulator drive pin. Connect to gate of MOSFET for linear regulator function.
SCR driver goes high when the processor's supply is over specified voltage limits.
The off-time is programmed by connecting a timing capacitor to this pin.
This is the (12V) supply to the IC, as well as gate drive to the bottom FET.
This is the gate drive to the bottom FET. Leave open in non-synchronous operation (when bottom
FET is replaced by a Schottky diode).
Both power and signal ground of the device.
Gate drive for top MOSFET.
This pin is a separate power supply input for the top drive. Can be connected to a charge pump
when only 12V is available.
Copyright © 1999
Rev. 1.2 11/99
7

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