DESCRIPTION KEY FEATURES

■ THREE-TERMINAL ADJUSTABLE OR FIXED

OUTPUT

■ GUARANTEED < 1.3V HEADROOM AT 5A

(LX8384A-xx)

■ GUARANTEED 2.0% MAX. REFERENCE

TOLERANCE (LX8384A-xx)

■ GUARANTEED 1.0% MAX. REFERENCE

TOLERANCE (LX8384B-xx)

■ OUTPUT CURRENT OF 5A MINIMUM

p 0.015% LINE REGULATION

p 0.15% LOAD REGULATION

The LX8384/84A/84B Series ICs are posi-

tive regulators designed to provide 5A

output current. These regulators yield

higher efficiency than currently available

devices with all internal circuitry designed

to operate down to a 1V input-to-output

differential. In each of these products,

the dropout voltage is fully specified as

a function of load current. Dropout is

guaranteed at a maximum of 1.3V

(8384A) and 1.5V (8384) at maximum

output current, decreasing at lower load

currents.

In addition, on-chip trimming adjusts

the reference voltage tolerance to 1%

maximum at room temperature and 2%

maximum over the 0 to 125°C range

for the LX8384A, making this ideal for

the Pentium P54C-VRE specification.

The LX8384B offers 0.8% tolerance at

room temperature and 1.0% maximum

over line, load and temperature.

Fixed versions are also available and

specified in the Available Options table

below.

The LX8384/84A/84B Series devices

are pin-compatible with earlier 3-

terminal regulators, such as the 117 series

products. While a 10µF output capacitor

is required on both input and output of

these new devices, this capacitor is

generally included in most regulator

designs.

The LX8384/84A/84B Series quiescent

current flows into the load, thereby

increasing efficiency. This feature

constrasts with PNP regulators where up

to 10% of the output current is wasted as

quiescent current. The LX8384-xxI is

specified over the industrial temperature

range of -25°C to 125°C, while the

LX8384-xxC/84A-xxC/84B-xxC is

specified over the commercial range of

0°C to 125°C.

APPLICATIONS

■ PENTIUM

PROCESSOR VRE APPLICATIONS

■ HIGH EFFICIENCY LINEAR REGULATORS

■ POST REGULATORS FOR SWITCHING POWER

SUPPLIES

■ BATTERY CHARGERS

■ CONSTANT CURRENT REGULATORS

■ CYRIX

6x86

■ AMD-K5

5A L

ROPOUT

OSITIVE

EGULATORS

P RODUCTION DATA SHEET

THE INFINITE POWER OF INNOVATION

LX8384-xx/8384A-xx/8384B-xx

LIN DOC #:

8384

PRODUCT HIGHLIGHT

3.5V, 5A REGULATOR

LX8384A

218

Ω

0.1%

3.5V at 5A

Capacitors must

have < 20mΩ Total ESR.

OUT

ADJ

1500µF

6MV1500GX

Sanyo

1500µF

5x 6MV1500GX

Sanyo

121Ω

Note: All surface-mount packages are available in Tape & Reel, append the letter "T" to part number.

(i.e. LX8384A-xxCDDT) "xx" refers to output voltage, please see table above.

An application of the LX8384A for the Pentium P54C processors meeting VRE specfication.

PACKAGE ORDER INFORMATION

(°C)

Plastic TO-220

3-pin

Plastic TO-263

3-pin

2.0% 1.5V LX8384-xxCP LX8384-xxCDD

0 to 125 2.0% 1.3V LX8384A-xxCP LX8384A-xxCDD

1.0% 1.3V LX8384B-xxCP LX8384B-xxCDD

-25 to 125 2.0% 1.5V LX8384-xxIP LX8384-xxIDD

Max. Dropout

Voltage

Max. Ref.

Accuracy

LX8384/84A/84B-00 Adjustable

LX8384/84A/84B-15 1.5V

LX8384/84A/84B-33 3.3V

Part #

Output

Voltage

AVAILABLE OPTIONS PER PART #

Other voltage options may be available —

Please contact factory for details.

Rev. 1.9 12/97

11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570

L INFINITY MICROELECTRONICS INC.

IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.

5A L

ROPOUT

OSITIVE

EGULATORS

LX8384-xx/8384A-xx/8384B-xx

PRODUCT DATABOOK 1996/1997

Rev. 1.9 12/97

RODUCTION DATA SHEET

ABSOLUTE MAXIMUM RATINGS (Note 1)

Power Dissipation .................................................................................. Internally Limited

Input Voltage................................................................................................................ 10V

Input to Output Voltage Differential ........................................................................... 10V

Operating Junction Temperature

Hermetic (K - Package) ........................................................................................ 150°C

Plastic (DD - Package) .......................................................................................... 150°C

Storage Temperature Range ...................................................................... -65°C to 150°C

Lead Temperature (Soldering, 10 seconds) ............................................................. 300°C

PACKAGE PIN OUTS

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.

OUT

ADJ / GND*

P PACKAGE

(Top View)

* Pin 1 is GND for fixed voltage versions.

ADJ / GND*

OUT

DD PACKAGE

(Top View)

* Pin 1 is GND for fixed voltage versions.

BLOCK DIAGRAM

Thermal

Limit Circuit

Control

Circuit

Bandgap

Circuit

Output

Circuit

Bias

Circuit

SOA Protection

Circuit

Current

Limit Circuit

ADJ or

GND*

P PACKAGE:

THERMAL RESISTANCE-JUNCTION TO TAB,

θθ

2.7°C/W

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

θθ

60°C/W

DD PACKAGE:

THERMAL RESISTANCE-JUNCTION TO TAB,

θθ

2.7°C/W

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

θθ

60°C/W*

Junction Temperature Calculation: T

= T

+ (P

x θ

The θ

numbers are guidelines for the thermal performance of the device/pc-board system.

All of the above assume no ambient airflow.

* θ

can be improved with package soldered to 0.5IN

copper area over backside ground

plane or internal power plane. θ

can vary from 20ºC/W to > 40ºC/W depending on

mounting technique.

THERMAL DATA

TAB IS V

OUT

TAB IS V

OUT

* This pin GND for fixed voltage versions.

5A L

ROPOUT

OSITIVE

EGULATORS

LX8384-xx/8384A-xx/8384B-xx

PRODUCT DATABOOK 1996/1997

Rev. 1.9 12/97

P RODUCTION DATA SHEET

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8384-xxC/8384A-xxC/8384B-xxC with

0°C ≤ T

≤ 125°C, and the LX8384-xxI with -25°C ≤ T

≤ 125°C; V

- V

OUT

= 3V; I

OUT

= 5A. Low duty cycle pulse testing techniques are used which

maintains junction and case temperatures equal to the ambient temperature.)

Parameter

Symbol

Test Conditions Units

LX8384/84A/84B-00

Min. Typ. Max.

Reference Voltage LX8384/84A-00 V

REF

OUT

= 10mA, T

= 25°C

(Note 4) 10mA ≤ I

OUT

≤ 5A, 1.5V ≤ (V

- V

OUT

), V

≤ 10V, P ≤ P

MAX

LX8384B-00 I

OUT

= 10mA, T

= 25°C

10mA ≤ I

OUT

≤ 5A, 1.5V ≤ (V

- V

OUT

), V

≤ 10V, P ≤ P

MAX

Line Regulation (Note 2) ∆V

REF

1.3V ≤ (V

- V

OUT

), V

≤ 7V, I

OUT

= 10mA

)

1.3V ≤ (V

- V

OUT

), V

≤ 10V, I

OUT

= 10mA

Load Regulation (Note 2)

∆V

REF

OUT

)

OUT

≥ V

REF

, V

- V

OUT

= 3V, 10mA ≤ I

OUT

≤ 5A

Thermal Regulation

∆V

OUT

(Pwr)

= 25°C, 20ms pulse

Ripple Rejection (Note 3) V

OUT

= 5V, f =120Hz, C

OUT

= 100µf Tantalum, V

= 6.5V

ADJ

= 10µF, I

OUT

= 5A

Adjust Pin Current I

ADJ

Adjust Pin Current Change (Note 4) ∆I

ADJ

10mA ≤ I

OUT

≤ I

OUT (MAX)

, 1.3V ≤ (V

- V

OUT

), V

≤ 10V

Dropout Voltage LX8384-00 ∆V ∆V

REF

= 1%, I

OUT

= 5A

LX8384A/84B-00 ∆V

REF

= 1%, I

OUT

= 5A

Minimum Load Current I

OUT (MIN)

≤ 10V

Maximum Output Current I

OUT (MAX)

- V

OUT

) ≤ 7V

- V

OUT

) ≤ 10V

Temperature Stability (Note 3) ∆V

OUT

(T)

Long Term Stability (Note 3) ∆V

OUT

(t) T

= 125°C, 1000 hours

RMS Output Noise (% of V

OUT

) (Note 3) V

OUT (RMS)

= 25°C, 10Hz ≤ f ≤ 10kHz

1.238 1.250 1.262 V

1.225 1.250 1.270 V

1.240 1.250 1.260 V

1.238 1.250 1.262 V

0.015 0.2 %

0.035 0.3 %

0.15 0.5 %

0.01 0.02 %/W

65 83 dB

20 55 100 µA

0.2 5 µA

1.2 1.5 V

1.1 1.3 V

210mA

56 A

34 A

0.25 %

0.3 1 %

0.003 %

Note 2. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to

heating effects are covered under the specification for thermal regulation.

Note 3. These parameters, although guaranteed, are not tested in production.

Note 4. See Maximum Output Current Section above.

Parameter

Symbol

Test Conditions Units

LX8384/84A/84B-15

Min. Typ. Max.

Output Voltage LX8384/84A-15 V

OUT

= 5V, I

OUT

= 0mA, T

= 25°C

(Note 4) 4.75V ≤ V

≤ 10V, 0mA ≤ I

OUT

≤ 5A, P ≤ P

MAX

LX8384B-15 V

= 5V, I

OUT

= 0mA, T

= 25°C

4.75V ≤ V

≤ 10V, 0mA ≤ I

OUT

≤ 5A, P ≤ P

MAX

Line Regulation (Note 2) ∆V

OUT

4.75V ≤ V

≤ 7V

)

4.75V ≤ V

≤ 10V

Load Regulation (Note 2)

∆V

OUT

)

= 5V, 0mA ≤ I

OUT

≤ I

OUT (MAX)

Thermal Regulation

∆V

OUT

(Pwr)

= 25°C, 20ms pulse

Ripple Rejection (Note 3) C

OUT

= 100µF (Tantalum), I

OUT

= 5A

Quiescent Current I

0mA ≤ I

OUT

≤ I

OUT (MAX)

, 4.75V ≤ V

≤ 10V

Dropout Voltage LX8384-15 ∆V ∆V

OUT

= 1%, I

OUT

≤ I

OUT (MAX)

LX8384A/84B-15 ∆V

OUT

= 1%, I

OUT

≤ I

OUT (MAX)

Maximum Output Current I

OUT (MAX)

≤ 7V

Temperature Stability (Note 3) ∆V

OUT

(T)

Long Term Stability (Note 3) ∆V

OUT

(t) T

= 125°C, 1000 hours

RMS Output Noise (% of V

OUT

) (Note 3) V

OUT (RMS)

= 25°C, 10Hz ≤ f ≤ 10kHz

1.485 1.50 1.515 V

1.470 1.50 1.530 V

1.488 1.50 1.512 V

1.485 1.50 1.515 V

13mV

15mV

2.5 7 mV

0.01 0.02 % / W

60 83 dB

410mA

1.2 1.5 V

1 1.3 V

56 A

0.25 %

0.3 1 %

0.003 %

LX8384-00 / 8384A-00 / 8384B-00 (Adjustable)

LX8384-15 / 8384A-15 / 8384B-15 (1.5V Fixed)

Part #	LX8384-00CP
Description	IC REG LDO ADJ 5A TO220
Category	RECTIFIER
Availability	In Stock
Qty	237

Qty	Price
1 - 49	$5.00532
50 - 99	$3.98151
100 - 149	$3.75399
150 - 199	$3.48856
200 +	$3.10937

Manufacturer	Available	Qty
Linfinity Microelectronics Inc Date Code: 9634	Freelance Stock: 173 Ships Immediately
Microsemi Corp Date Code: 0420	Freelance Stock: 64 Ships Immediately

LX8384-00CP

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