LX1663CD Microsemi Analog Mixed Signal Group, LX1663CD Datasheet

LX1663CD

Manufacturer Part Number

LX1663CD

Description

IC PWM PROG SGL 5BIT DAC 16SOIC

Manufacturer

Microsemi Analog Mixed Signal Group

Datasheet

1.LX1662CD.pdf (15 pages)

Specifications of LX1663CD

Applications

Controller, Intel Pentium® II

Voltage - Input

10.8 ~ 13.2 V

Number Of Outputs

Voltage - Output

1.8 ~ 2.8 V

Operating Temperature

0°C ~ 70°C

Mounting Type

Surface Mount

Package / Case

16-SOIC

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current page: 1 of 15
Download datasheet (344Kb)

Rev. 1.2a,2005-03-09

The LX1662/62A and LX1663/63A 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 without

Expensive Current Sense Resistors. Current-

sensing mechanism can use PCB trace resistance

or the parasitic resistance of the main inductor.

The LX1662A and LX1663A have reduced current

sense comparator threshold for optimum

performance using a PCB trace. For applications

requiring a high degree of accuracy, a

conventional sense resistor can be used to sense

current.

Programmable Synchronous Rectifier 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

H E

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

N F I N I T E

0 to 70

Note: Available in Tape & Reel. Append the letters ‘TR’ to the part number. (i.e. LX1663CD-TR)

(°C)

O W E R

VID0

VID1

VID2

VID3

VID4

11861 W

RoHS Compliant / Pb-free Transition DC:0503

LX1662ACN

LX1662CN

0.1µF

O F

ESTERN

Plastic DIP

14-Pin

D E S C R I P T I O N

I N

N N O V A T I O N

VENUE

14-pin, Narrow Body SOIC

I N I T Y

INV

VID0

VID1

VID2

VID3

CC_CORE

, G

LX1662

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).

Smallest Package Size. The LX1662 is available

in a narrow body 14-pin surface mount IC

package for space sensitive applications. The

LX1663 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 Reduces

System Cost. The modulated offtime architecture

results in the fastest transient 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 LX1663 &

LX1663A 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 LX1663 &

LX1663A also have a logiclevel Power Good

Flag to signal when the output voltage is out of

specified limits.

P R O D U C T H I G H L I G H T

ARDEN

PACKAGE ORDER INFO

BDRV

TDRV

GND

VID4

LX1663ACN

Plastic DIP

16-Pin

LX1663CN

I C R O E L E C T R O N I C S

ROVE

12V

, CA. 92841, 714-898-8121, F

1µF

680pF

INGLE

IRL3102

1µH

-C

HIP

IRL3303

6.3V

1500µF x3

, 2.5µH

RoHS Compliant / Pb-free Transition DC:0440

R O D U C T I O N

** Three capacitors for Pentium

Four capacitors for Pentium II

LX1662ACD

ROGRAMMABLE

LX1662CD

6.3V, 1500µF x 3**

LX1662 / 62A, LX1663 /63A

Plastic SOIC

14-Pin

2.5m

N C

: 714-893-2570

PWM C

Supply Voltage

for CPU Core

LX1663ACD

A T A

ONTROLLERS WITH

LX1663CD

Plastic SOIC

16-Pin

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

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

OUT

K E Y F E A T U R E S

H E E T

5-B

DAC

Related parts for LX1663CD

LX1663CD Summary of contents

Page 1

... VID0 VID1 VID2 VID3 VID4 Plastic DIP N T (°C) 14-Pin A RoHS Compliant / Pb-free Transition DC:0503 LX1662CN LX1662ACN Note: Available in Tape & Reel. Append the letters ‘TR’ to the part number. (i.e. LX1663CD-TR) L Copyright © 1999 Rev. 1.2a,2005-03-09 11861 W ESTERN INGLE HIP specification. The device can drive dual MOSFET’ ...

Page 2

LX1662/62A, LX1663/63A Supply Voltage (V ) .................................................................................................... 25V C1 Supply Voltage (V ) .................................................................................................... 15V CC Output Drive Peak Current Source (500ns) ............................................................... 1.5A Output Drive Peak Current Sink (500ns) ................................................................... 1.5A Input Voltage (SS, INV CC_CORE ...

Page 3

T (Unless otherwise specified, 10.8 < Parameter Symbol Reference & DAC Section (See Table 1 - Next Page) Regulation Accuracy (See Table 1) Regulation Accuracy Timing Section Off Time Initial OT Off Time Temp ...

Page 4

LX1662/62A, LX1663/63A * 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 ...

Page 5

Output Set Point EFFICIENCY AT 3.1V EFFICIENCY AT 2.8V 75 EFFICIENCY AT 1. (A) OUT FIGURE 2 — Efficiency Test Results: Non-Synchronous Operation, V FIGURE ...

Page 6

LX1662/62A, LX1663/63A SS 1 40mV INV 2 Error Comp ** 100mV V 3 CC_CORE CS Comp 10k 4 5 VID0 VID1 Trimmed 2V Out 2V REF UVLO 10.6/10.1 Internal REG OV ...

Page 7

Pin LX1662 LX1663 Name Pin # Pin # 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 ...

Page 8

LX1662/62A, LX1663/63A IC OPERATION Referring to the block diagram and typical application circuit, the output turns ON the top MOSFET, allowing the inductor current to increase. At the error comparator threshold, the PWM latch is reset, the top MOSFET turns ...

Page 9

C 3 0.1µF LX1662 INV 3 V CC_CORE 4 VID0 VID0 5 VID1 VID1 6 VID2 VID2 7 VID3 VID3 VID4 14-pin, Narrow Body SOIC FIGURE 6 — LX1662 In A Pentium / Pentium II Processor Single ...

Page 10

LX1662/62A, LX1663/63A C 3 0.1µ VID0 5 VID1 6 VID2 7 VID3 8 VID4 FIGURE 8 — Pentium II Processor Application With OVP, Power Good And Loss-Less Current Sensing (Synchronous 0.1µF LX1663 1 SS ...

Page 11

Ref Description Ω The LX1662/63 devices are very easy to design with, requiring only a few simple calculations to implement a given design. The following procedures and considerations should provide effec- tive operation for virtually all applications. Refer to the ...

Page 12

LX1662/62A, LX1663/63A INPUT INDUCTOR SELECTION In order to cope with faster transient load changes, a smaller output inductor is needed. However, reducing the size of the output inductor will result in a higher ripple voltage on the input supply. This ...

Page 13

CURRENT LIMIT (continued) PCB Sense Resistor A PCB sense resistor should be constructed as shown in Figure 10. By attaching directly to the large pads for the capacitor and inductor, heat is dissipated efficiently by the larger copper masses. Connect ...

Page 14

LX1662/62A, LX1663/63A CURRENT LIMIT (continued) In cases where large that the trip point current would L be lower than the desired short-circuit current limit, a resistor (R can be put in parallel with shown ...

Page 15

LAYOUT GUIDELINES - THERMAL DESIGN A great deal of time and effort were spent optimizing the thermal design of the demo boards. Any user who intends to implement an embedded motherboard would be well advised to carefully read and follow ...

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