LX8385-05 Microsemi Corporation, LX8385-05 Datasheet

LX8385-05

Manufacturer Part Number

LX8385-05

Description

3 A LOW DROPOUT POSITIVE REGULATORS

Manufacturer

Microsemi Corporation

Datasheet

1.LX8385-05.pdf (8 pages)

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Rev. 2.0a 10/00

H E

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 drop-

out voltage is fully specified as a function

of load current. The LX8385's dropout is

guaranteed at a maximum of 1.5V at maxi-

mum output current, decreasing at lower

load currents. The LX8385A/85B have a

maximum dropout voltage of 1.3V.

reference tolerance: ±1.0% over line, load

and temperature, with 0.8% initial accu-

racy. The LX8385/85A have 1.0% initial

accuracy, with 2% over line, load and tem-

perature.

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

1500µF, 6.3V

6MV1500GX

The LX8385B offers a tighter voltage

N F I N I T E

-25 to 125

0 to 125

11861 W

(°C)

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

O W E R

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

ESTERN

3.3V, 3 A R

LX8385

D E S C R I P T I O N

Dropout

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

Voltage

O F

1.5V

1.3V

1.5V

I N

ADJ

VENUE

P A C K A G E O R D E R I N F O R M A T I O N *

N N O V A T I O N

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

I N I T Y

, G

E G U L AT O R

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.

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.

+125°C applications, and the LX8385-xxC

/8385B-xxC is rated for 0°C to +125°C

applications.

OUT

ARDEN

LX8385A-xxCP

LX8385B-xxCP

The LX8385/85A/85B series devices are

The quiescent current of the LX8385/

The LX8385-xxI is rated for -25°C to

LX8385-xxCP

Plastic TO-220

3-pin

LX8385-xxIP

121

200

ROVE

I C R O E L E C T R O N I C S

, CA. 92841, 714-898-8121, F

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

2x 1500µF, 6.3V

6MV1500GX

from Sanyo

3 A L

3.3V at 3A

LX8385A-xxCD

LX8385B-xxCD

LX8385-xxCD

LX8385-xxID

Plastic TO-263

3-pin

O W

R O D U C T I O N

R O P O U T

N C

p 0.015% Line Regulation

p 0.1% Load Regulation

VA I L A B L E

Other voltage options may be available —

Part #

LX8385/85A/85B-00

LX8385/85A/85B-33

LX8385/85A/85B-05

: 714-893-2570

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

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

Please contact factory for details.

O S I T I V E

K E Y F E A T U R E S

A P P L I C A T I O N S

A T A

P T I O N S P E R

LIN D

E G U L A T O R S

H E E T

O C

Adjustable

Voltage

Output

# : 8385

3.3V

5.0V

A R T

Related parts for LX8385-05

LX8385-05 Summary of contents

Page 1

... Voltage 1. 125 1.3V 1.3V -25 to 125 1.5V 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 Copyright © 1999 Rev. 2.0a 10/00 11861 W A ESTERN LX8385-xx/8385A-xx/8385B-xx ...

Page 2

... LX8385-xx/8385A-xx/8385B- Power Dissipation .................................................................................. Internally Limited Input Voltage ................................................................................................................ 10V Input to Output Voltage Differential ........................................................................... 10V Operating Junction Temperature Plastic (P, DD & ...

Page 3

... (Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8385-xxC/85A/85B-xxC with 0°C 125°C and the LX8385-xxI with -25° junction and case temperatures equal to the ambient temperature.) ...

Page 4

... LX8385-xx/8385A-xx/8385B- LX8385-05/85A-05/85B-05 (5.0V Fixed) Parameter Output Voltage LX8385-05 (Note 4) LX8385A/85B-05 Line Regulation (Note 2) Load Regulation (Note 2) Thermal Regulation Ripple Rejection (Note 3) Quiescent Current Dropout Voltage LX8385-05 ...

Page 5

... The LX8385/85A/85B series ICs are easy to use Low-Dropout (LDO) voltage regulators. They have all of the standard self-protection features expected of voltage regulators: short circuit protection, safe operating area protection and automatic thermal shutdown if the device temperature rises above approximately 165° ...

Page 6

... Peff P where: R When the circuit is connected as shown in Figure 3, the parasitic resistance appears as its actual value, rather than the higher R LX8385/85A/85B FIGURE 3 — Connections For Best Load Regulation LX8385/85A/85B OUT IN V OUT ADJ V R1 REF I ADJ 50µA R2 ...

Page 7

... Thermal compound at the case-to- heat-sink interface is strongly recommended. If the case of the device must be electrically isolated, a thermally conductive spacer Copyright © 1999 Rev. 2.0a 10/00 LX8385-xx/8385A-xx/8385B- ...

Page 8

... Output 1k FIGURE 6 — 5V Regulator With Shutdown LX8385/85A/85B-33 V OUT IN IN GND FIGURE 7 — Fixed 3.3V Output Regulator ) DROPOUT (MAX LX8385/85A/85B OUT IN ADJ R1 121 C1* 10µ Needed if device is far from filter capacitors 1.25V 1 + OUT R1 FIGURE 5 — 1. Adjustable Regulator ...

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