Microsemi Corporation LX8385B-33CP, LX8385B-05CDD, LX8385B-00CP, LX8385B-00CDD, LX8385A-33CP Datasheet

		LIN DO C # : 8385
	LX8385-xx/8385A-xx/8385B-xx
		3 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 LX8385/8385A/8385B series ICs are positive regulators designed to provide 3A output current. Each regulator yields higher efficiency than currently available devices with all internal circuitry designed to operate down to a 1V input-to-output- differential. In these products, the dropout voltage is fully specified as a function of load current. The LX8385's dropout is guaranteed at a maximum of 1.5V at maximum output current, decreasing at lower load currents. The LX8385A/85B have a maximum dropout voltage of 1.3V.

The LX8385B offers a tighter voltage reference tolerance: ±1.0% over line, load and temperature, with 0.8% initial accuracy. The LX8385/85A have 1.0% initial accuracy, with 2% over line, load and temperature.

The LX8385/85A/85B series devices are pin-compatible with earlier 3-terminal regulators, such as 117 series products. While a 10µF output capacitor is required on both input and output of these new devices, this is generally included in most regulator designs.

The quiescent current of the LX8385/ 85A/85B series products flows into the load, increasing efficiency. This feature contrasts with PNP regulator designs, where up to 10% of the output current is wasted as quiescent current.

The LX8385-xxI is rated for -25°C to +125°C applications, and the LX8385-xxC /8385B-xxC is rated for 0°C to +125°C applications.

NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.

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

3.3V, 3A RE G U L AT O R

5V	IN	LX8385	OUT	3.3V at 3A
1500µF, 6.3V		ADJ	121Ω	2x 1500µF, 6.3V
			1%
6MV1500GX				6MV1500GX
				from Sanyo

200Ω 1%

K E Y F E AT U R E S

■Three-Terminal Adjustable Or Fixed Output Voltage

■Guaranteed 1% Voltage Reference Accuracy Over Line, Load And Temperature (LX8385B)

■Guaranteed < 1.5V Headroom At 3A (LX8385)

■Guaranteed < 1.3V Headroom At 3A (LX8385A/8385B)

■Output Current Of 3A Minimum

p0.015% Line Regulation

p0.1% Load Regulation

A P P L I C AT I O N S

■High Efficiency Linear Regulators

■Post Regulators For Switching Power Supplies

■Battery Chargers

■Constant Current Regulators

■Graphics & Standard Supplies

■Processor I/O Supply

■Low Voltage Memory & Chipset Supplies

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

	Part #		Output
			Voltage
	LX8385/85A/85B-00		Adjustable
	LX8385/85A/85B-33		3.3V
	LX8385/85A/85B-05		5.0V

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

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

TA (°C)

Dropout

P

Plastic TO-220

DD

Plastic TO-263

Voltage

3-pin

3-pin

1.5V

LX8385-xxCP

LX8385-xxCD

0 to 125

1.3V

LX8385A-xxCP

LX8385A-xxCD

1.3V

LX8385B-xxCP

LX8385B-xxCD

-25 to 125

1.5V

LX8385-xxIP

LX8385-xxID

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

(i.e. LX8385-00CDDT). "xx" refers to output voltage, please see table above.

* Consult factory for availability of TO-3 Metal Can.

Copyright © 1999

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. 2.0a 10/00

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

LX8385-xx/8385A-xx/8385B-xx

3 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
	Plastic (P, DD & DL 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.

THERMAL DATA

P PACKAGE:

THERMAL RESISTANCE-JUNCTION TO TAB, θJT	3.0°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA	60°C/W
DD PACKAGE:
THERMAL RESISTANCE-JUNCTION TO TAB, θJT	3.0°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 © 1999
		Rev. 2.0a 10/00

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

LX8385-xx/8385A-xx/8385B-xx

3 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 LX8385-xxC/85A/85B-xxC with 0°C ≤ TA ≤ 125°C and the LX8385-xxI with -25°C ≤ TA ≤ 125°C; VIN - VOUT = 3V; IOUT = 3A. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)

LX8385-00/85A/85B-00 (Adjustable)

	Parameter			Symbol	Test Conditions	LX8385/85A/85B-00			Units
						Min.	Typ.	Max.
	Reference Voltage		LX8385-00	VREF	IOUT = 10mA, TA = 25°C	1.238	1.250	1.262	V
	(Note 4)				10mA ≤ IOUT ≤ IOUT (MAX), 1.5V ≤ (VIN - VOUT), VIN ≤ 10V, P ≤ PMAX	1.225	1.250	1.270	V
			LX8385A/85B-00		IOUT = 10mA, TA = 25°C	1.240	1.250	1.260	V
					10mA ≤ IOUT ≤ IOUT (MAX), 1.5V ≤ (VIN - VOUT), VIN ≤ 10V, P ≤ PMAX	1.238	1.250	1.262	V
	Line Regulation (Note 2)			VREF (VIN)	1.5V ≤ (VIN - VOUT) ≤ 7V, IOUT = 10mA		0.015	0.2	%
	Load Regulation (Note 2)			VREF (IOUT)	VIN - VOUT = 3V, 10mA ≤ IOUT ≤ 3A		0.2	0.5	%
	Thermal Regulation			VOUT (Pwr)	TA = 25°C, 20ms pulse		0.01	0.04	%/W
	Ripple Rejection (Note 3)				VOUT = 5V, f =120Hz, COUT = 100µf Tantalum, VIN = 6.5V	65	83		dB
					CADJ = 10µF, IOUT = 3A
	Adjust Pin Current			IADJ			55	100	µA
	Adjust Pin Current Change (Note 4)			IADJ	10mA ≤ IOUT ≤ IOUT (MAX) , 1.5V ≤ (VIN - VOUT), VIN ≤ 10V		0.2	5	µA
	Dropout Voltage		LX8385-00	V	VREF = 1%, IOUT = 3A		1.2	1.5	V
			LX8385A/85B-00		VREF = 1%, IOUT = 3A		1.1	1.3	V
	Minimum Load Current			IOUT (MIN)	VIN ≤ 10V		2	10	mA
	Maximum Output Current			IOUT (MAX)	(VIN - VOUT) ≤ 7V, VIN ≤ 10V	3	3.5		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		%

LX8385-33/85A-33/85B-33 (3.3V Fixed)

	Parameter			Symbol	Test Conditions	LX8385/85A/85B-33			Units
						Min.	Typ.	Max.
	Output Voltage		LX8385-33	VOUT	VIN = 5V, IOUT = 0mA, TA = 25°C	3.267	3.3	3.333	V
	(Note 4)				4.75V ≤ VIN ≤ 10V, 0mA ≤ IOUT ≤ 3A, P ≤ PMAX	3.235	3.3	3.365	V
			LX8385A/85B-33		VIN = 5V, IOUT = 0mA, TA = 25°C	3.274	3.3	3.326	V
					4.75V ≤ VIN ≤ 10V, 0mA ≤ IOUT ≤ 3A, P ≤ PMAX	3.267	3.3	3.333	V
	Line Regulation (Note 2)			VOUT	4.75V ≤ VIN ≤ 7V		1	6	mV
				(VIN)	4.75V ≤ VIN ≤ 10V		2	10	mV
	Load Regulation (Note 2)			VOUT (IOUT)	VIN = 5V, 0mA ≤ IOUT ≤ IOUT (MAX)		5	15	mV
	Thermal Regulation			VOUT(Pwr)	TA = 25°C, 20ms pulse		0.01	0.02	% / W
	Ripple Rejection (Note 3)				COUT = 100µF (Tantalum), IOUT = 3A	60	83		dB
	Quiescent Current			IQ	0mA ≤ IOUT ≤ IOUT (MAX) , 4.75V ≤ VIN ≤ 10V		4	10	mA
	Dropout Voltage		LX8385-33	V	VOUT = 1%, IOUT ≤ IOUT (MAX)		1.2	1.5	V
			LX8385A/85B-33		VOUT = 1%, IOUT ≤ IOUT (MAX)		1.1	1.3	V
	Maximum Output Current			IOUT (MAX)	VIN ≤ 7V	3	3.5		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 © 1999	3
Rev. 2.0a 10/00