Microsemi Corporation LX1665CN, LX1665CDW, LX1665ACN, LX1665ACDW, LX1664CN Datasheet
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LX1664/64A, LX1665/65A
DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC
T HE I NFINITE P OWER OF I NNOVATION
DESCRIPTION KEY FEATURES
The LX1664/64A and LX1665/65A 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 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 comparator threshold for optimum performance using a sense resistor. For applications 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
IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.
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).
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 regulator suitable for powering a 1.5V GTL+ bus
or 2.5V clock supply.
(continued next page)
P RODUCTION DATA SHEET
■ 5-bit Programmable Output For CPU Core
Supply
■ Adjustable Linear Regulator Driver Output
■ No Sense Resistor Required For Short-
Circuit Current Limiting
■ Designed To Drive Either Synchronous Or
Non-Synchronous Output Stages
■ 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
(LX1665 only)
APPLICATIONS
■ Socket 7 (Pentium Class) Microprocessor
Supplies (including Intel Pentium Processor,
TM
AMD-K6
M2TM Processors)
■ Pentium II and Deschutes Processor & L2Cache Supplies
■ Voltage Regulator Modules
And Cyrix® 6x86TM, Gx86TM and
PRODUCT HIGHLIGHT
LX1665 IN A PENTIUM II SINGLE-CHIP POWER SUPPLY SOLUTION
L
1µH
C
8
680pF
F1 20A
2
Q
IRL3102
Q
IRL3303
D
1
2
Q
4
IRLZ44
Plastic SOIC
16-pin
5V
6.3V
1500µF x3
C
2
L
1
2.5µH
R
5
R
6
R
1
0.0025
C
9
330µF
Supply Voltage
for CPU Core
C
1
6.3V, 1500µF x 3**
** Three capacitors for Pentium
Four capacitors for Pentium II
Supply Voltage
For I/O Chipset or GTL+ Bus
C
7
330µF
Plastic SOIC Wide
DW
18-pin
12V
C
3
VID0
VID1
VID2
VID3
VID4
0.1µF
U1
LX1665
1
SS
2
INV
3
V
CC_CORE
4
VID0
5
VID1
6
VID2
7
VID3 OV
8
VID4 L
9
L
FB
Wide-Body SOIC
PWRGD
18-pin
V
TDRV
GND
BDRV
V
DRV
18
C1
17
16
15
14
CC
13
C
T
12
11
10
C
5
1µF
OV
PWRGD
PACKAGE ORDER INFORMATION
T
(°C)
A
Plastic DIP
N
16-pin
Plastic DIP
N
18-pin
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)
V
OUT
for
See next page
Selection Guide
Copyright © 1999
Rev. 1.2 11/99
L INF INITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX1664/64A, LX1665/65A
DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC
P RODUCTION DATA SHEET
DESCRIPTION (con't.)
Smallest Package Size. The LX1664 is
available in a narrow body 16-pin surface
mount IC package for space sensitive applications. 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, reducing output capacitor requirements, and reducing 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 logiclevel Power Good Flag to signal when the
output voltage is out of specified limits.
DEVICE SELECTION GUIDE
OVP and Current-Sense
DEVICE Packages Power Good Comp. Thresh. (mV) Optimal Load
LX1664 16-pin SOIC
LX1664A & DIP 60 Pentium II (> 10A)
LX1665 18-pin SOIC
LX1665A & DIP 60 Pentium II (> 10A)
No
Yes
100 Pentium-class (<10A)
100 Pentium-class (<10A)
ABSOLUTE MAXIMUM RATINGS (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, V
Operating Junction Temperature
, CT, VID0-VID4) ........................................... -0.3V to 6V
CC_CORE
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,
N (18-PIN DIP) PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
D PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
DW PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
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
θθ
θ
θθ
JA
θθ
θ
θθ
JA
θθ
θ
θθ
JA
θθ
θ
θθ
JA
65°C/W
60°C/W
120°C/W
90°C/W
PACKAGE PIN OUTS
1 16
SS
215
INV
314
V
CC_CORE
413
VID0
512
VID1
611
VID2
710
VID3
89
VID4
N PACKAGE — 16-Pin
LX1664/1664A (Top View)
1 18
SS
217
INV
316
V
CC_CORE
415
VID0
514
VID1
613
VID2
712
VID3
811
VID4
910
L
FB
N PACKAGE — 18-Pin
LX1665/1665A (Top View)
1 16
SS
215
INV
V
CC_CORE
VID0
VID1
VID2
VID3
VID4
314
413
512
611
710
89
D PACKAGE — 16-Pin
LX1664/1664A (Top View)
1 18
SS
217
INV
L
FB
316
415
514
613
712
811
910
V
CC_CORE
VID0
VID1
VID2
VID3
VID4
DW PACKAGE — 18-Pin
LX1665/1665A (Top View)
V
C1
TDRV
GND
BDRV
V
CC
C
T
L
DRV
L
FB
V
C1
TDRV
GND
BDRV
V
CC
C
T
OV
L
DRV
PWRGD
V
C1
TDRV
GND
BDRV
V
CC
C
T
L
DRV
L
FB
V
TDRV
GND
BDRV
V
C
OV
L
DRV
PWRGD
C1
CC
T
2
Copyright © 1999
Rev. 1.2 11/99
PRODUCT DATABOOK 1996/1997
LX1664/1664A, LX1665/65A
DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC
P RODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS
(
Unless otherwise specified, 10.8 < VCC < 13.2, 0°C ≤ TA ≤ 70°C. Test conditions: VCC = 12V, T = 25°C. Use Application Circuit.
Parameter
Symbol
Test Conditions
Reference & DAC Section (See Table 1 - Next Page)
Regulation Accuracy (See Table 1) (Less 40mV output adaptive positioning), VCC = 12V, I
Regulation Accuracy 1.8V ≤ V
OUT
≤ 2.8V
Timing Section
Off Time Initial OT V
Off Time Temp Stability V
Discharging Current I
Ramp Peak V
Ramp Peak-Valley V
DISVCC_CORE
P
RPPVCC_CORE
Ramp Valley Delay to Output 10% Overdrive
= 1.3V, CT = 390pF
CC_CORE
V
= 3.5V, CT = 390pF
CC_CORE
= 1.3V to 3.5V
CC_CORE
= 1.3V, VCT = 1.5V
= 1.3V
V
= 3.5V
CC_CORE
Error Comparator Section
Input Bias Current I
Input Offset Voltage V
EC Delay to Output 10% Overdrive
B
IO
1.3V < VSS = V
< 3.5V
INV
Current Sense Section
Input Bias Current (V
Pulse By Pulse C
L
CS Delay to Output 10% Overdrive
Pin) I
CC_CORE
LX1664/1665 V
1.3V < V
B
Initial Accuracy
CLP
INV
LX1664A/1665A Initial Accuracy
= V
CC_CORE
< 3.5V
Output Drivers Section
Drive Rise Time TRVC1 = VCC = 12V, CL = 3000pF
Drive Fall Time TFVC1 = VCC = 12V, CL = 3000pF
Drive High V
Drive Low V
Output Pull Down V
DHVCC
VCC = VCC = 12V, I
DLVCC
VCC = VCC = 12V, I
PDVCC
= VCC = 12V, I
= VCC = 12V, I
= VC = 0, I
PULL UP
= 20mA
SOURCE
= 200mA
SINK
= 20mA
SOURCE
= 200mA
SINK
= 2mA
UVLO and S.S. Section
Start-Up Threshold V
Hysteresis V
SS Sink Current I
SS Sat Voltage V
ST
HYST
SD
OLVC1
VC1 = 10.1V
= 9V, ISD = 200µA
Supply Current Section
Dynamic Operating Current I
VCC = VC1 = 12V, Out Freq = 200kHz, CL = 0
CD
Power Good / Over-Voltage Protection Section (LX1665 Only)
Lower Threshold (V
Hysteresis
Power Good Voltage Low I
Over-Voltage Threshold (V
OVP Sourcing Current VOV = 5V
CC_CORE
PWRGD
CC_CORE
/ DAC
= 5mA
/ V
DAC
)
OUT
)
Linear Regulator Section
Output Voltage Set by external resistors
Setpoint Accuracy IL = 0.5A using 0.5% resistors
Output Temperature Drift
Load Regulation
Cummulative Accuracy
Op-Amp Output Current Open Loop
LOAD
= 6A
LX1664/1665 (A)
Min. Typ. Max.
-30 30 mV
-1 1 %
180 210 240 µA
0.9 1 1.1 V
0.37 0.42 0.47 V
36 41 46 mV
85 100 115 mV
50 60 70 mV
9.9 10.1 10.4 V
2 5.5 mA
88 90 92 %
110 117 125 %
30 45 mA
1.5 3.6 V
-1.5 1.5 %
50 70 mA
)
Units
2µs
1µs
40 ppm
2V
100 ns
0.8 2 µA
200 ns
27 35 µA
200 ns
70 ns
70 ns
11 V
10 V
0.06 0.1 V
0.8 1.2 V
0.8 1.4 V
0.31 V
0.15 0.6 V
27 mA
1%
0.5 0.7 V
40 ppm
1.5 %
3%
Copyright © 1999
Rev. 1.2 11/99
3
PRODUCT DATABOOK 1996/1997
0A
5A/Div.
Time - 100µs/Div.
2.8V
100mV/Div.
Output Load
0 to 14A
Output Voltage
LX1664/64A, LX1665/65A
DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC
P RODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS
Table 1 - Adaptive Transient Voltage Output (Output Voltage Setpoint Typical)
Processor Pins
0 = Ground, 1 = Open (Floating)
VID4 VID3 VID2 VID1 VID0
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.
Output Voltage (V
0.0A Nominal Output*
CC_CORE
)
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.
4
FIGURE 1 — Output Transient Response
(using 5mΩ sense resistor and 5µH output inductor)
Copyright © 1999
Rev. 1.2 11/99
PRODUCT DATABOOK 1996/1997
LX1664/1664A, LX1665/65A
DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC
P RODUCTION DATA SHEET
CHARACTERISTICS CURVES
95
90
85
EFFICIENCY (%)__
80
Output Set Point
EFFICIENCY AT 3.1V
75
70
1234567891011121314
EFFICIENCY AT 2.8V
EFFICIENCY AT 1.8V
I
OUT
(A)
FIGURE 2 — Efficiency Test Results:
Non-Synchronous Operation, VIN = 5V
90
100
95
90
85
EFFICIENCY (%)__
80
75
70
Output Set Point
EFFICIENCY AT 3.1V
EFFICIENCY AT 2.8V
EFFICIENCY AT 1.8V
1234567891011121314
I
(A)
OUT
FIGURE 3 — Efficiency Test Results:
Synchronous Operation, VIN = 5V
85
80
75
70
Output Se t Point
1.8V EFF ICIENCY
65
60
1234567891011121314
FIGURE 4 — Efficiency Test Results: Synchronous Operation, V
2.8V EFF ICIENCY
3.3V EFF ICIENCY
I
(A)
OUT
= 12V.
IN
Note: Non-synchronous operation not recommended for 12V operation, due to power loss in Schottky diode.
Copyright © 1999
Rev. 1.2 11/99
5
PRODUCT DATABOOK 1996/1997
LX1664/64A, LX1665/65A
DUAL OUTPUT PWM CONTROLLERS WITH 5-BIT DAC
P RODUCTION DATA SHEET
BLOCK DIAGRAM
V
CC
2V Out
UVLO
10.6/10.1
Error Comp
CS Comp
V
INV
CC_CORE
1
SS
40mV
2
100mV
3
**
Trimmed
2V REF
Internal
V
CC
V
REG
Off-Time
Controller
R DOM
Break
Before
Make
PWM Latch
S
RQ
SYNC EN
Comp
OV Comp
V
18
C1
Q
0.7V
TDRV
17
GND
16
BDRV
15
V
14
CC
13
C
T
UV Comp
10k
DAC OUT
LX1665/1665A ONLY
DAC
4 5
VID0 VID16VID27VID38VID4
1.5V
Linear Op Amp
Note: Pin numbers are correct for LX1665/1665A, 18-pin package.
* Not connected on LX1664/1664A.
** 60mV in LX1664A/1665A.
12
10
11
9
OV*
PWRGD*
L
DRV
L
FB
FIGURE 5 — LX1664/1665 Block Diagram
6
Copyright © 1999
Rev. 1.2 11/99
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