LX1663ACD datasheet, PDF - EEWORLD Datasheet

L I N D

O C

# :

1662

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 VA T I O N

P

R O D U C T I O N

D

A T A

S

H E E T

DESCRIPTION

The LX1662/62A and LX1663/63A 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

LX1662A

and

LX1663A

have reduced current sense com-

parator threshold for optimum perfor-

mance using a PCB trace. 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

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).

Smallest Package Size.

The LX1662 is

available in a narrow body 14-pin surface

mount IC package for space sensitive appli-

cations. 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 Re-

duces System Cost.

The modulated off-

time architecture results in the fastest tran-

sient response for a given inductor, reduc-

ing output capacitor requirements, and re-

ducing 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 logic-

level Power Good Flag to signal when the

output voltage is out of specified limits.

K E Y F E AT U R E S

I

5-bit Programmable Output For CPU Core

Supply

I

No Sense Resistor Required For Short-

Circuit Current Limiting

I

Designed To Drive Either Synchronous Or

Non-Synchronous Output Stages

I

Lowest System Cost Possible For Price-

Sensitive Pentium And Pentium II Class

Applications

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

(LX1663 only)

I

Small, Surface-Mount Packages

A P P L I C AT I O N S

I

Socket 7 Microprocessor Supplies

(including Intel Pentium Processor, AMD-

K6

TM

And Cyrix

®

6x86

TM

, Gx86

TM

and M2

TM

Processors)

I

Pentium II and Deschutes Processor & L2-

Cache Supplies

I

Voltage Regulator Modules

I

General Purpose DC:DC Converter

Applications

IMPORTANT:

For the most current data, consult LinFinity's web site:

http://www.linfinity.com.

PRODUCT HIGHLIGHT

LX1662

IN A

P

ENTIUM

/P

ENTIUM

II

S

INGLE

-C

HIP

P

OWER

S

UPPLY

S

OLUTION

C

3

0.1µF

12V

L

2

1µH

5V

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

2.5m9

Supply Voltage

for CPU Core

VID0

VID1

VID2

VID3

VID4

4

5

6

7

V

OUT

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

LX1662CN

LX1662ACN

N

Plastic DIP

16-pin

LX1663CN

LX1663ACN

D

Plastic SOIC

14-pin

LX1662CD

LX1662ACD

D

Plastic SOIC

16-pin

LX1663CD

LX1663ACD

Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX1662CDT)

Rev. 1.1 11/99

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

Selection Guide

PA C K A G E O R D E R I N F O R M AT I O N

See next page

for

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

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)

2

Rev. 1.1 11/99

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

(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.)

Parameter

Reference & DAC Section

Regulation Accuracy

Symbol

Test Conditions

LX1662/1663 (A)

Min. Typ.

Max.

-30

-1

2

1

40

210

2

1

0.42

100

0.8

41

200

27

100

60

200

70

11

10

0.06

0.8

9.9

10.1

0.31

5.5

0.15

30

1

Units

mV

%

µs

ppm

µA

V

ns

µA

mV

ns

µA

mV

ns

V

mA

V

mA

%

V

%

mA

(See Table 1 - Next Page)

Regulation Accuracy

(See Table 1)

(Less 40mV output adaptive positioning)

, V

CC

= 12V, I

LOAD

= 6A

1.8V

≤

V

OUT

≤

2.8V

OT

V

CC_CORE

= 1.3V, C

T

= 390pF

V

CC_CORE

= 3.5V, C

T

= 390pF

V

CC_CORE

= 1.3V to 3.5V

V

CC_CORE

= 1.3V, V

CT

= 1.5V

V

CC_CORE

= 1.3V

V

CC_CORE

= 3.5V

10% Overdrive

1.3V < V

SS

= V

INV

< 3.5V

Timing Section

Off Time Initial

Off Time Temp Stability

Discharging Current

Ramp Peak

Ramp Peak-Valley

Ramp Valley Delay to Output

I

DIS

V

P

V

RPP

180

0.9

0.37

240

1.1

0.47

Error Comparator Section

Input Bias Current

Input Offset Voltage

E

C

Delay to Output

I

B

V

IO

36

10% Overdrive

I

B

V

CLP

1.3V < V

INV

= V

CC_CORE

< 3.5V

Initial Accuracy

10% Overdrive

V

C1

= V

CC

= 12V, C

L

= 3000pF

V

C1

= V

CC

= 12V, C

L

= 3000pF

V

CC

= V

CC

= 12V, I

SOURCE

= 20mA

V

CC

= V

CC

= 12V, I

SINK

= 200mA

V

CC

= V

CC

= 12V, I

SOURCE

= 20mA

V

CC

= V

CC

= 12V, I

SINK

= 200mA

V

CC

= V

C

= 0, I

PULL UP

= 2mA

2

46

Current Sense Section

Input Bias Current (V

CC_CORE

Pin)

Pulse By Pulse C

L

LX1662/1663

LX1662A/1663A

C

S

Delay to Output

85

50

35

115

70

Output Drivers Section

Drive Rise Time

Drive Fall Time

Drive High

Drive Low

Output Pull Down

T

R

T

F

V

DH

V

DL

V

PD

V

ST

V

HYST

I

SD

V

OL

I

CD

0.1

1.2

1.4

10.4

UVLO and S.S. Section

Start-Up Threshold

Hysteresis

SS Sink Current

SS Sat Voltage

V

C1

= 10.1V

V

C1

= 9V, I

SD

= 200µA

V

CC

= V

C1

= 12V, Out Freq = 200kHz, C

L

= 0

(V

CC_CORE

/ DAC

OUT

)

I

PWRGD

= 5mA

(V

CC_CORE

/ V

DAC

)

V

OV

= 5V

2

0.6

27

Supply Current Section

Dynamic Operating Current

Lower Threshold

Hysteresis

Power Good Voltage Low

Over-Voltage Threshold

OVP Sourcing Current

Power Good / Over-Voltage Protection Section

(LX1663 Only)

88

90

1

0.5

117

45

92

0.7

125

110

30

Rev. 1.1 11/99

3

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

1

* Nominal =

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

DAC setpoint voltage

1

1.34V

1.30V

1

0

1.39V

1.35V

0

1

1.44V

1.40V

0

1.49V

1.45V

1

1.54V

1.50V

1

0

1.59V

1.55V

0

1

1.64V

1.60V

0

1.69V

1.65V

1

1.74V

1.70V

1

0

1.79V

1.75V

0

1

1.84V

1.80V

0

1.89V

1.85V

1

1.94V

1.90V

1

0

1.99V

1.95V

0

1

2.04V

2.00V

0

2.09V

2.05V

1

2.04V

2.00V

1

0

2.14V

2.10V

0

1

2.24V

2.20V

0

2.34V

2.30V

1

2.44V

2.40V

1

0

2.54V

2.50V

0

1

2.64V

2.60V

0

2.74V

2.70V

1

2.84V

2.80V

1

0

2.94V

2.90V

0

1

3.04V

3.00V

0

3.14V

3.10V

1

3.24V

3.20V

1

0

3.34V

3.30V

0

1

3.44V

3.40V

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

Rev. 1.1 11/99

Output Voltage

2.8V

100mV/Div.

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

CHARACTERISTICS CURVES

95

100

90

95

EFFICIENCY (%)

_

90

85

EFFICIENCY (%)

_

Output Set Point

85

80

Output Set Point

75

EFFICIENCY AT 3.1V

EFFICIENCY AT 2.8V

EFFICIENCY AT 1.8V

75

EFFICIENCY AT 3.1V

EFFICIENCY AT 2.8V

EFFICIENCY AT 1.8V

70

1

2

3

4

5

6

7

8

9

10

11

12

13

14

70

1

2

3

4

5

6

7

8

9

10

11

12

13

14

I

OUT

(A)

I

OUT

(A)

FIGURE 2

— Efficiency Test Results:

Non-Synchronous Operation, V

IN

= 5V

FIGURE 3

— Efficiency Test Results:

Synchronous Operation, V

IN

= 5V

90

85

80

75

70

Output Set Point

1.8V EFFICIENCY

65

2.8V EFFICIENCY

3.3V EFFICIENCY

60

1

2

3

4

5

6

7

8

9

10

11

12

13

14

I

OUT

(A)

FIGURE 4

— Efficiency Test Results: Synchronous Operation, V

IN

= 12V.

Note: Non-synchronous operation not recommended for 12V operation, due to power loss in Schottky diode.

Rev. 1.1 11/99

5

Parameter Name	Attribute value
Is it Rohs certified?	incompatible
Maker	Linfinity Microelectronics
package instruction	PLASTIC, SOIC-16
Reach Compliance Code	unknown
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER
control mode	CURRENT-MODE
Control Technology	CONSTANT OFF TIME
Maximum input voltage	13.2 V
Minimum input voltage	10.09 V
Nominal input voltage	12 V
JESD-30 code	R-PDSO-G16
JESD-609 code	e0
Number of functions	1
Number of terminals	16
Maximum operating temperature	70 °C
Minimum operating temperature
Maximum output current	1.5 A
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Encapsulate equivalent code	SOP16,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Certification status	Not Qualified
surface mount	YES
Switch configuration	PUSH-PULL
Maximum switching frequency	200 kHz
technology	BIPOLAR
Temperature level	COMMERCIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL

	LX1663ACD	LX1663CDT	LX1662CDT	LX1662ACN	LX1662ACD	LX1662ACDT	LX1663ACN	LX1663ACDT
Description	Switching Controller, Current-mode, 1.5A, 200kHz Switching Freq-Max, BIPolar, PDSO16, PLASTIC, SOIC-16	Switching Controller, Current-mode, 1.5A, 200kHz Switching Freq-Max, PDSO16, PLASTIC, SOIC-16	Switching Controller, Current-mode, 1.5A, 200kHz Switching Freq-Max, PDSO14, PLASTIC, SOIC-14	Switching Controller, Current-mode, 1.5A, 200kHz Switching Freq-Max, BIPolar, PDIP14, PLASTIC, DIP-14	Switching Controller, Current-mode, 1.5A, 200kHz Switching Freq-Max, BIPolar, PDSO14, PLASTIC, SOIC-14	Switching Controller, Current-mode, 1.5A, 200kHz Switching Freq-Max, PDSO14, PLASTIC, SOIC-14	Switching Controller, Current-mode, 1.5A, 200kHz Switching Freq-Max, BIPolar, PDIP16, PLASTIC, DIP-16	Switching Controller, Current-mode, 1.5A, 200kHz Switching Freq-Max, PDSO16, PLASTIC, SOIC-16
package instruction	PLASTIC, SOIC-16	PLASTIC, SOIC-16	PLASTIC, SOIC-14	PLASTIC, DIP-14	PLASTIC, SOIC-14	PLASTIC, SOIC-14	PLASTIC, DIP-16	PLASTIC, SOIC-16
Reach Compliance Code	unknown	unknown	unknown	unknown	unknown	unknown	unknown	unknown
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER
control mode	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
Control Technology	CONSTANT OFF TIME	CONSTANT OFF TIME	CONSTANT OFF TIME	CONSTANT OFF TIME	CONSTANT OFF TIME	CONSTANT OFF TIME	CONSTANT OFF TIME	CONSTANT OFF TIME
Maximum input voltage	13.2 V	13.2 V	13.2 V	13.2 V	13.2 V	13.2 V	13.2 V	13.2 V
Minimum input voltage	10.09 V	10.09 V	10.09 V	10.09 V	10.09 V	10.09 V	10.09 V	10.09 V
Nominal input voltage	12 V	12 V	12 V	12 V	12 V	12 V	12 V	12 V
JESD-30 code	R-PDSO-G16	R-PDSO-G16	R-PDSO-G14	R-PDIP-T14	R-PDSO-G14	R-PDSO-G14	R-PDIP-T16	R-PDSO-G16
Number of functions	1	1	1	1	1	1	1	1
Number of terminals	16	16	14	14	14	14	16	16
Maximum operating temperature	70 °C	70 °C	70 °C	70 °C	70 °C	70 °C	70 °C	70 °C
Maximum output current	1.5 A	1.5 A	1.5 A	1.5 A	1.5 A	1.5 A	1.5 A	1.5 A
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE	IN-LINE	SMALL OUTLINE	SMALL OUTLINE	IN-LINE	SMALL OUTLINE
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
surface mount	YES	YES	YES	NO	YES	YES	NO	YES
Switch configuration	PUSH-PULL	PUSH-PULL	PUSH-PULL	PUSH-PULL	PUSH-PULL	PUSH-PULL	PUSH-PULL	PUSH-PULL
Maximum switching frequency	200 kHz	200 kHz	200 kHz	200 kHz	200 kHz	200 kHz	200 kHz	200 kHz
Temperature level	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL	COMMERCIAL
Terminal form	GULL WING	GULL WING	GULL WING	THROUGH-HOLE	GULL WING	GULL WING	THROUGH-HOLE	GULL WING
Terminal location	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL
Maker	Linfinity Microelectronics	-	Linfinity Microelectronics	Linfinity Microelectronics	Linfinity Microelectronics	Linfinity Microelectronics	Linfinity Microelectronics	Linfinity Microelectronics

LX1663ACD

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