Not Recommended For New Design
LX1662 / 62A, LX1663 /63A
S
INGLE
-C
HIP
P
ROGRAMMABLE
PWM C
ONTROLLERS WITH
5-B
IT
DAC
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O V A T I O N
P
R O D U C T I O N
D
A T A
S
H E E T
DESCRIPTION
specification. The device can drive dual
The LX1662/62A and LX1663/63A are
MOSFET’s resulting in typical efficiencies of 85
Monolithic Switching Regulator Controller
IC’s
designed to provide a low cost, high
- 90% even with loads in excess of 10 amperes.
performance adjustable power supply for
For cost sensitive applications, the bottom
advanced microprocessors and other applications
MOSFET can be replaced with a Schottky diode
requiring a very fast transient response and a high (non-synchronous operation).
degree of accuracy.
Smallest Package Size.
The LX1662 is available
in a narrow body 14-pin surface mount IC
Short-Circuit Current Limiting without
Expensive Current Sense Resistors.
Current-
package for space sensitive applications. The
sensing mechanism can use PCB trace resistance
LX1663 provides the additional functions of
or the parasitic resistance of the main inductor.
Over Voltage Protection (OVP) and Power Good
The
LX1662A
and
LX1663A
have reduced current (PWRGD) output drives for applications
sense comparator threshold for optimum
requiring output voltage monitoring and
performance using a PCB trace. For applications
protection functions.
requiring a high degree of accuracy, a
Ultra-Fast Transient Response Reduces
conventional sense resistor can be used to sense
System Cost.
The modulated offtime architecture
current.
results in the fastest transient response for a given
inductor, reducing output capacitor requirements,
Programmable Synchronous Rectifier Driver
for CPU Core.
The main output is adjustable
and reducing the total regulator system cost.
from 1.3V to 3.5V using a 5-bit code. The IC can
Over-Voltage Protection and Power Good
read a VID signal set by a DIP switch on the
Flag.
The OVP output in the LX1663 &
motherboard, or hardwired into the processor’s
LX1663A can be used to drive an SCR crowbar
package (as in the case of Pentium® Pro and
circuit to protect the load in the event of a short-
Pentium II processors). The 5-bit code adjusts the circuit of the main MOSFET. The LX1663 &
output voltage between 1.30 and 2.05V in 50mV
LX1663A also have a logiclevel Power Good
increments and between 2.0 and 3.5V in 100mV
Flag to signal when the output voltage is out of
increments, conforming to the Intel Corporation
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
L
2
1µH
5V
C
3
0.1µF
6.3V
1500µF x3
C
2
U1
LX1662
1
2
3
C
5
1µF
V
C1
TDRV
GND
BDRV
V
CC
C
T
VID4
14
13
12
11
10
9
8
SS
INV
V
CC_CORE
VID0
VID1
VID2
VID3
Q
1
IRL3102
L
1
, 2.5µH
Q
2
IRL3303
R
1
2.5m
Supply Voltage
for CPU Core
VID0
4
5
6
7
V
OUT
VID1
VID2
VID3
VID4
C
8
680pF
6.3V, 1500µF x 3**
** Three capacitors for Pentium
Four capacitors for Pentium II
C
1
14-pin, Narrow Body SOIC
T
A
(°C)
0 to 70
N
Plastic DIP
14-Pin
PACKAGE ORDER INFO
Plastic DIP
Plastic SOIC
N
16-Pin
D
14-Pin
LX1663CN
LX1663ACN
LX1662CD
LX1662ACD
D
Plastic SOIC
16-Pin
LX1663CD
LX1663ACD
RoHS Compliant / Pb-free Transition DC:0503
RoHS Compliant / Pb-free Transition DC:0440
LX1662CN
LX1662ACN
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
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
LX1662/62A, LX1663/63A
S
INGLE
-C
HIP
P
ROGRAMMABLE
PWM C
ONTROLLERS WITH
5-B
IT
DAC
P
OVP and
Power Good
No
Yes
R O D U C T I O N
D
A T A
S
H E E T
PACKAGE PIN OUTS
DEVICE SELECTION GUIDE
DEVICE
LX1662
LX1662A
LX1663
LX1663A
Packages
14-pin SOIC
& DIP
16-pin SOIC
& DIP
Current-Sense
Comp. Thresh. (mV)
100
60
100
60
Optimal Load
Pentium-class (<10A)
Pentium II (> 10A)
Pentium-class (<10A)
Pentium II (> 10A)
SS
INV
V
CC_CORE
VID0
VID1
VID2
VID3
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
C1
TDRV
GND
BDRV
V
CC
C
T
VID4
N PACKAGE — 14-Pin
LX1662/1662A
(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)
SS
INV
V
CC_CORE
VID0
VID1
VID2
VID3
VID4
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Supply Voltage (V
C1
) .................................................................................................... 25V
Supply Voltage (V
CC
) .................................................................................................... 15V
Output Drive Peak Current Source (500ns) ............................................................... 1.5A
Output Drive Peak Current Sink (500ns) ................................................................... 1.5A
Input Voltage (SS, INV, V
CC_CORE
, C
T
, VID0-VID4) ........................................... -0.3V to 6V
Operating Junction Temperature
Plastic (N & D Packages) ...................................................................................... 150°C
Storage Temperature Range .................................................................... -65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) ............................................................. 300°C
Peak Package Solder Reflow Temp. (40 second max. exposure)..........................................260°C (+0, -5)
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.
V
C1
TDRV
GND
BDRV
V
CC
C
T
OV
PWRGD
N PACKAGE — 16-Pin
LX1663/1663A
(Top View)
SS
INV
V
CC_CORE
VID0
VID1
VID2
VID3
1
2
3
4
5
6
7
14
13
12
11
10
9
8
T H E R M A L D ATA
N PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
D PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
120°C/W
65°C/W
V
C1
TDRV
GND
BDRV
V
CC
C
T
VID4
D PACKAGE — 14-Pin
LX1662/1662A
(Top View)
SS
INV
V
CC_CORE
VID0
VID1
VID2
VID3
VID4
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
θ
JA
).
The
θ
JA
numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow
V
C1
TDRV
GND
BDRV
V
CC
C
T
OV
PWRGD
D PACKAGE — 16-Pin
LX1663/1663A
(Top View)
RoHS / Pb-free 100% Matte Tin Lead Finish
2
Copyright © 1999
Rev. 1.2a,
11/04
PRODUCT DATABOOK 1996/1997
LX1662/62A, LX1663/63A
S
INGLE
-C
HIP
P
ROGRAMMABLE
PWM C
ONTROLLERS WITH
5-B
IT
DAC
P
R O D U C T I O N
D
A T A
S
H E E T
ELECTRICAL CHARACTERISTICS
Table 1 - Adaptive Transient Voltage Output
Processor Pins
0 = Ground, 1 = Open (Floating)
(Output
Voltage Setpoint Typical)
Output Voltage (V
CC_CORE
)
VID0
0.0A
Nominal Output*
VID4
VID3
VID2
VID1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
* Nominal =
1
1
1
1
1
1
1
1
1
0
1
0
1
0
1
0
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0
1
0
1
0
1
0
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
0
DAC setpoint voltage
1
1
1.34V
1.30V
1
0
1.39V
1.35V
0
1
1.44V
1.40V
0
0
1.49V
1.45V
1
1
1.54V
1.50V
1
0
1.59V
1.55V
0
1
1.64V
1.60V
0
0
1.69V
1.65V
1
1
1.74V
1.70V
1
0
1.79V
1.75V
0
1
1.84V
1.80V
0
0
1.89V
1.85V
1
1
1.94V
1.90V
1
0
1.99V
1.95V
0
1
2.04V
2.00V
0
0
2.09V
2.05V
1
1
2.04V
2.00V
1
0
2.14V
2.10V
0
1
2.24V
2.20V
0
0
2.34V
2.30V
1
1
2.44V
2.40V
1
0
2.54V
2.50V
0
1
2.64V
2.60V
0
0
2.74V
2.70V
1
1
2.84V
2.80V
1
0
2.94V
2.90V
0
1
3.04V
3.00V
0
0
3.14V
3.10V
1
1
3.24V
3.20V
1
0
3.34V
3.30V
0
1
3.44V
3.40V
0
0
3.54V
3.50V
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, output current and
output ripple.
Output Load
0A
5A/Div.
0 to 14A
Time - 100µs/Div.
FIGURE 1
— Output Transient Response
(Using 5mΩ sense resistor and 5µH output inductor)
4
Copyright © 1999
Rev. 1.2a,
11/04
Output Voltage
2.8V
100mV/Div.
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