LX1663CD Datasheet LX1662CD, LX1663CD | P1-P3

P

RODUCTION

D

ATA

S

HEET

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OWER OF

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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

Rev. 1.2a,2005-03-09

LX1662 / 62A, LX1663 /63

A

S

INGLE

-C

HIP

P

ROGRAMMABLE

PWM

C

ONTROLLERS WITH

5-B

IT

DAC

DESCRIPTION

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

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.

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

PACKAGE ORDER INFO

N

Plastic DIP

14-Pin

N

Plastic DIP

16-Pin

D

Plastic SOIC

14-Pin

D

Plastic SOIC

16-Pin

T

A

(°C)

RoHS Compliant / Pb-free Transition DC:0503 RoHS Compliant / Pb-free Transition DC:0440

LX1662CN LX1663CN LX1662CD LX1663CD

0 to 70

LX1662ACN LX1663ACN LX1662ACD LX1663ACD

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

PRODUCT HIGHLIGHT

SS

TDRV

V

CC

INV

V

CC_CORE

VID0

VID1

VID2

VID3

VID4

C

T

BDRV

GND

V

C1

U1

LX1662

VID3

C

5

1µF

12V

R

1

V

O

UT

5V

14-pin, Narrow Body SOIC

Q

1

IRL3102

L

1

, 2.5µH

6.3V, 1500µF x 3**

14

13

12

11

10

9

1

2

3

4

5

6

7

8

C

8

680pF

VID2

VID1

VID0

VID4

C

3

0.1µF

2.5m

Supply Voltage

for CPU Core

6.3V

1500µF x3

** Three capacitors for Pentium

Four capacitors for Pentium II

Q

2

IRL3303

C

1

C

2

L

2

1µH

S

INGLE

-C

HIP

P

ROGRAMMABLE

PWM C

ONTROLLERS

WITH

5-B

IT

DAC

LX1662/62A, LX1663/63A

PRODUCT DATABOOK 1996/1997

Rev. 1.2a, 11/04

2

P RODUCTION DATA SHEET

ABSOLUTE MAXIMUM RATINGS (Note 1)

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

PACKAGE PIN OUTS

V

C1

TDRV

GND

BDRV

V

CC

C

T

VID4

SS

INV

V

CC_CORE

VID0

VID1

VID2

VID3

1 14

213

312

411

510

69

78

N PACKAGE — 14-Pin

LX1662/1662A (Top View)

N PACKAGE:

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

θθ

θ

JA

65°C/W

D PACKAGE:

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

θθ

θ

JA

120°C/W

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

THERMAL DATA

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

VID4

SS

INV

V

CC_CORE

VID0

VID1

VID2

VID3

1 14

213

312

411

510

69

78

D PACKAGE — 14-Pin

LX1662/1662A (Top View)

V

C1

TDRV

GND

BDRV

V

CC

C

T

OV

PWRGD

SS

INV

V

CC_CORE

VID0

VID1

VID2

VID3

VID4

1 16

215

314

413

512

611

710

89

N PACKAGE — 16-Pin

LX1663/1663A (Top View)

V

C1

TDRV

GND

BDRV

V

CC

C

T

OV

PWRGD

SS

INV

V

CC_CORE

VID0

VID1

VID2

VID3

VID4

1 16

215

314

413

512

611

710

89

D PACKAGE — 16-Pin

LX1663/1663A (Top View)

DEVICE SELECTION GUIDE

OVP and Current-Sense

DEVICE Packages Power Good Comp. Thresh. (mV) Optimal Load

LX1662 14-pin SOIC

No

100 Pentium-class (<10A)

LX1662A & DIP 60 Pentium II (> 10A)

LX1663 16-pin SOIC

Yes

100 Pentium-class (<10A)

LX1663A & DIP 60 Pentium II (> 10A)

Peak Package Solder Reflow Temp. (40 second max. exposure)..........................................260°C (+0, -5)

RoHS / Pb-free 100% Matte Tin Lead Finish

S

INGLE

-C

HIP

P

ROGRAMMABLE

PWM C

ONTROLLERS

WITH

5-B

IT

DAC

LX1662/62A, LX1663/63A

PRODUCT DATABOOK 1996/1997

3

Rev. 1.2a, 11/04

P RODUCTION DATA SHEET

ELECTRICAL CHARACTERISTICS

(

Unless otherwise specified, 10.8 < V

CC

< 13.2, 0°C ≤ T

A

≤ 70°C. Test conditions: V

CC

= 12V, T = 25°C. Use Application Circuit.

)

Reference & DAC Section (See Table 1 - Next Page)

Parameter

Symbol

Test Conditions

Regulation Accuracy (See Table 1) (Less 40mV output adaptive positioning), V

CC

= 12V, I

LOAD

= 6A

Regulation Accuracy 1.8V ≤ V

OUT

≤ 2.8V

Timing Section

Off Time Initial OT V

CC_CORE

= 1.3V, C

T

= 390pF

V

CC_CORE

= 3.5V, C

T

= 390pF

Off Time Temp Stability V

CC_CORE

= 1.3V to 3.5V

Discharging Current I

DIS

V

CC_CORE

= 1.3V, V

CT

= 1.5V

Ramp Peak V

P

Ramp Peak-Valley V

RPP

V

CC_CORE

= 1.3V

V

CC_CORE

= 3.5V

Ramp Valley Delay to Output 10% Overdrive

Input Bias Current (V

CC_CORE

Pin) I

B

1.3V < V

INV

= V

CC_CORE

< 3.5V

Pulse By Pulse C

L

LX1662/1663 V

CLP

Initial Accuracy

LX1662A/1663A Initial Accuracy

C

S

Delay to Output 10% Overdrive

Error Comparator Section

Input Bias Current I

B

1.3V < V

SS

= V

INV

< 3.5V

Input Offset Voltage V

IO

E

C

Delay to Output 10% Overdrive

Output Drivers Section

Drive Rise Time T

R

V

C1

= V

CC

= 12V, C

L

= 3000pF

Drive Fall Time T

F

V

C1

= V

CC

= 12V, C

L

= 3000pF

Drive High V

DH

V

CC

= V

CC

= 12V, I

SOURCE

= 20mA

V

CC

= V

CC

= 12V, I

SINK

= 200mA

Drive Low V

DL

V

CC

= V

CC

= 12V, I

SOURCE

= 20mA

V

CC

= V

CC

= 12V, I

SINK

= 200mA

Output Pull Down V

PD

V

CC

= V

C

= 0, I

PULL UP

= 2mA

UVLO and S.S. Section

Start-Up Threshold V

ST

Hysteresis V

HYST

SS Sink Current I

SD

V

C1

= 10.1V

SS Sat Voltage V

OL

V

C1

= 9V, I

SD

= 200µA

Supply Current Section

Dynamic Operating Current I

CD

V

CC

= V

C1

= 12V, Out Freq = 200kHz, C

L

= 0

Power Good / Over-Voltage Protection Section (LX1663 Only)

Lower Threshold (V

CC_CORE

/ DAC

OUT

)

Hysteresis

Power Good Voltage Low I

PWRGD

= 5mA

Over-Voltage Threshold (V

CC_CORE

/ V

DAC

)

OVP Sourcing Current V

OV

= 5V

Units

-30 30 mV

-1 1 %

LX1662/1663 (A)

Min. Typ. Max.

2µs

1µs

40 ppm

180 210 240 µA

2V

0.9 1 1.1 V

0.37 0.42 0.47 V

100 ns

0.8 2 µA

36 41 46 mV

200 ns

27 35 µA

85 100 115 mV

50 60 70 mV

200 ns

70 ns

11 V

10 V

0.06 0.1 V

0.8 1.2 V

0.8 1.4 V

9.9 10.1 10.4 V

0.31 V

2 5.5 mA

0.15 0.6 V

27 mA

88 90 92 %

1%

0.5 0.7 V

110 117 125 %

30 45 mA

Current Sense Section

LX1663CD

LX1663CD

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