Microsemi Corporation LX8384A-33CDD, LX8384A-15CP, LX8384A-15CDD, LX8384A-00CP, LX8384A-00CDD Datasheet

		LIN DO C #: 8384
	LX8384-xx/8384A-xx/8384B-xx
		5 A L O W D R O P O U T P O S I T I V E R E G U L A T O R S
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

D E S C R I P T I O N

The LX8384/84A/84B Series ICs are positive 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.

K E Y F E AT U R E S

■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

p0.015% LINE REGULATION

p0.15% LOAD REGULATION

A P P L I C AT I O N S

■PENTIUM® PROCESSOR VRE APPLICATIONS

■HIGH EFFICIENCY LINEAR REGULATORS

■POST REGULATORS FOR SWITCHING POWER SUPPLIES

■BATTERY CHARGERS

■CONSTANT CURRENT REGULATORS

■CYRIX® 6x86TM

■AMD-K5TM

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

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

3.5V, 5A RE G U L AT O R

5V	IN	LX8384A	OUT	3.5V at 5A

*		121Ω	1500µF*
1500µF	ADJ
6MV1500GX		0.1%	5x 6MV1500GX
Sanyo			Sanyo

	218Ω		Capacitors must
			* have < 20mΩ Total ESR.
0.1%

AVA I L A B L E O P T I O N S P E R PA R T #

	Part #		Output
			Voltage
	LX8384/84A/84B-00		Adjustable
	LX8384/84A/84B-15		1.5V
	LX8384/84A/84B-33		3.3V

Other voltage options may be available — Please contact factory for details.

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

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

TA (°C)

Max. Ref.

Max. Dropout

P

Plastic TO-220

DD

Plastic TO-263

Accuracy

Voltage

3-pin

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

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.

	Copyright © 1997	L I N F I N I T Y M I C R O E L E C T R O N I C S I N C .	1
		11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: [phone]
	Rev. 1.9 12/97

P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7

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

5 A L O W D R O P O U T P O S I T I V E R E G U L A T O R S

P R O D U C T I O N D A T A S H E E T

	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

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.

THERMAL DATA

P PACKAGE:

THERMAL RESISTANCE-JUNCTION TO TAB, θJT	2.7°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA	60°C/W
DD PACKAGE:
THERMAL RESISTANCE-JUNCTION TO TAB, θJT	2.7°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA	60°C/W*

Junction Temperature Calculation: TJ = TA + (PD x θJA).

The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.

*θJAcan be improved with package soldered to 0.5IN2 copper area over backside ground plane or internal power plane. θJAcan vary from 20ºC/W to > 40ºC/W depending on mounting technique.

PACKAGE PIN OUTS

TAB IS VOUT

3 VIN

2 VOUT

1 ADJ / GND*

P PACKAGE

(Top View)

* Pin 1 is GND for fixed voltage versions.

TAB IS VOUT

3			VIN
2			VOUT

1 ADJ / GND*

DDPACKAGE

(Top View)

* Pin 1 is GND for fixed voltage versions.

BLOCK DIAGRAM

VIN

Bias

Circuit

Thermal	Bandgap	Control	Output
Limit Circuit	Circuit	Circuit	Circuit

VOUT

SOA Protection

Circuit

ADJ or					Current
GND*					Limit Circuit

* This pin GND for fixed voltage versions.

2		Copyright © 1997
		Rev. 1.9 12/97

P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7

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

5 A L O W D R O P O U T P O S I T I V E R E G U L A T O R S

P R O D U C T I O N D A T A S H E E T

E L E C T R I C A L C H A R A C T E R I S T I C S

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

0°C ≤ TA ≤ 125°C, and the LX8384-xxI with -25°C ≤ TA ≤ 125°C; VIN - VOUT = 3V; IOUT = 5A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)

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

	Parameter			Symbol	Test Conditions	LX8384/84A/84B-00			Units
						Min.	Typ.	Max.
	Reference Voltage		LX8384/84A-00	VREF	IOUT = 10mA, TA = 25°C	1.238	1.250	1.262	V
	(Note 4)				10mA ≤ IOUT ≤ 5A, 1.5V ≤ (VIN - VOUT), VIN ≤ 10V, P ≤ PMAX	1.225	1.250	1.270	V
			LX8384B-00		IOUT = 10mA, TA = 25°C	1.240	1.250	1.260	V
					10mA ≤ IOUT ≤ 5A, 1.5V ≤ (VIN - VOUT), VIN ≤ 10V, P ≤ PMAX	1.238	1.250	1.262	V
	Line Regulation (Note 2)			VREF	1.3V ≤ (VIN - VOUT), VIN ≤ 7V, IOUT = 10mA		0.015	0.2	%
				(VIN)	1.3V ≤ (VIN - VOUT), VIN ≤ 10V, IOUT = 10mA		0.035	0.3	%
	Load Regulation (Note 2)			VREF (IOUT)	VOUT ≥ VREF, VIN - VOUT = 3V, 10mA ≤ IOUT ≤ 5A		0.15	0.5	%
	Thermal Regulation			VOUT(Pwr)	TA = 25°C, 20ms pulse		0.01	0.02	%/W
	Ripple Rejection (Note 3)				VOUT = 5V, f =120Hz, COUT = 100µf Tantalum, VIN = 6.5V	65	83		dB
					CADJ = 10µF, IOUT = 5A
	Adjust Pin Current			IADJ		20	55	100	µA
	Adjust Pin Current Change (Note 4)			IADJ	10mA ≤ IOUT ≤ IOUT (MAX) , 1.3V ≤ (VIN - VOUT), VIN ≤ 10V		0.2	5	µA
	Dropout Voltage		LX8384-00	V	VREF = 1%, IOUT = 5A		1.2	1.5	V
			LX8384A/84B-00		VREF = 1%, IOUT = 5A		1.1	1.3	V
	Minimum Load Current			IOUT (MIN)	VIN ≤ 10V		2	10	mA
	Maximum Output Current			IOUT (MAX)	(VIN - VOUT) ≤ 7V	5	6		A
					(VIN - VOUT) ≤ 10V	3	4		A
	Temperature Stability (Note 3)			VOUT (T)			0.25		%
	Long Term Stability	(Note 3)		VOUT (t)	TA = 125°C, 1000 hours		0.3	1	%
	RMS Output Noise (% of VOUT) (Note 3)			VOUT (RMS)	TA = 25°C, 10Hz ≤ f ≤ 10kHz		0.003		%

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

	Parameter			Symbol	Test Conditions	LX8384/84A/84B-15			Units
						Min.	Typ.	Max.
	Output Voltage		LX8384/84A-15	VOUT	VIN = 5V, IOUT = 0mA, TA = 25°C	1.485	1.50	1.515	V
	(Note 4)				4.75V ≤ VIN ≤ 10V, 0mA ≤ IOUT ≤ 5A, P ≤ PMAX	1.470	1.50	1.530	V
			LX8384B-15		VIN = 5V, IOUT = 0mA, TA = 25°C	1.488	1.50	1.512	V
					4.75V ≤ VIN ≤ 10V, 0mA ≤ IOUT ≤ 5A, P ≤ PMAX	1.485	1.50	1.515	V
	Line Regulation (Note 2)			VOUT	4.75V ≤ VIN ≤ 7V		1	3	mV
				(VIN)	4.75V ≤ VIN ≤ 10V		1	5	mV
	Load Regulation (Note 2)			VOUT (IOUT)	VIN = 5V, 0mA ≤ IOUT ≤ IOUT (MAX)		2.5	7	mV
	Thermal Regulation			VOUT(Pwr)	TA = 25°C, 20ms pulse		0.01	0.02	% / W
	Ripple Rejection (Note 3)				COUT = 100µF (Tantalum), IOUT = 5A	60	83		dB
	Quiescent Current			IQ	0mA ≤ IOUT ≤ IOUT (MAX) , 4.75V ≤ VIN ≤ 10V		4	10	mA
	Dropout Voltage		LX8384-15	V	VOUT = 1%, IOUT ≤ IOUT (MAX)		1.2	1.5	V
			LX8384A/84B-15		VOUT = 1%, IOUT ≤ IOUT (MAX)		1	1.3	V
	Maximum Output Current			IOUT (MAX)	VIN ≤ 7V	5	6		A
	Temperature Stability (Note 3)			VOUT (T)			0.25		%
	Long Term Stability	(Note 3)		VOUT (t)	TA = 125°C, 1000 hours		0.3	1	%
	RMS Output Noise (% of VOUT) (Note 3)			VOUT (RMS)	TA = 25°C, 10Hz ≤ f ≤ 10kHz		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.

Copyright © 1997	3
Rev. 1.9 12/97