LX8580-00CP - Obsolete - Microsemi Corporation

PRODUCTION DATA SHEET

THE INFINITE POWER OF INNOVATION

Not Recommened For New Design

See The LX8580A

LINFINITY MICROELECTRONICS INC.

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

Rev. 1.1, 2005-10-21

LX8580

7A VERY LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR

DESCRIPTION

The LX8580 is a high-performance, very low

dropout voltage regulator, designed for use with

advanced microprocessors. This product can be

used with separate voltage supplies for the control

and power sections, allowing a power section

dropout voltage as low as 100mV. The LX8580

can also be used in a single voltage supply

configuration, with a dropout performance similar

to that of the LX8584 (1.3V at 7A).

The LX8580 is supplied in a five terminal TO-

220 package, which allows the implementation

of remote (Kelvin) voltage sensing. This sensing

compensates for output voltage variations due to

load changes and resistive voltage drops in

connectors and board traces. Typical load

regulation measured at the sense pin is less than

1mV for a load current step of 7mA to 7A.

The LX8580 is ideal for generating a

secondary 2 - 2.5V low voltage supply on a

motherboard where a 3.3V supply is already

available.

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

KEY FEATURES

 Low Dropout, 800mV Max. at 7A

Output Current in Dual Supply

Mode

 Fast Transient Response

 Remote Sensing

 1mV Load Regulation

 Adjustable Output

 No Supply Sequencing Problems

in Dual Supply Mode

KEY FEATURES

 Microprocessor Supplies

 3.3V to 2.5V Processor Power

Supplies

 High-Current Regulators

 Post Regulators for Switching

Supplies

PRODUCT HIGHLIGHT

LOAD

ADJUST

VCTRL VOUT + 1.3V Max

VPWR VOUT + VDROPOUT

LX8580

VOUT

VCTRL

VPWR

SENSE

OUTPUT

BADJ

REFOUT RI

1VV •+

⎟

⎠

⎞

⎜

⎝

⎛+=

Special Capabilities of the LX8580 To Allow

44% Smaller LDO Th ermal Dissipat ion

PACKAGE ORDER INFO

P Plastic TO-220

5-Pin DD Plastic To-263

5-Pin

TA (°C) Dropout Voltage RoHS Compliant

Transition DC: 0543 RoHS Compliant

Transition DC: 0535

0 to 125 0.1V – 0.8V LX8580-00CP LX8580-00CDD

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX 8580-00CDD-TR)

7A V

ERY

ROPOUT

OSITIVE

DJUSTABLE

EGULATOR

LX8580

PRODUCT DATABOOK 1996/1997

PRODUCTION DATA SHEET

Rev. 1.1

ABSOLUTE MAXIMUM RATINGS (Note 1)

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

VPWR Input Voltage ........................................................................................................... 7V

VCTRL Input Voltage......................................................................................................... 13V

Operating Junction Temperature

Plastic (P 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.

BLOCK DIAGRAM

Current

Limiting

Amplifier

Thermal Overload

Voltage

Regulation

Amplifier

Power

OUTPUT

SENSE

ADJUST

REF

Control

CTRL

PWR

VPWR

VCTRL

OUTPUT

ADJUST

SENSE

P PACKAGE

(Top View)

TAB IS OUTPUT

DD PACKAGE

(Top View)

VPWR

VCTRL

OUTPUT

ADJUST

SENSE

TAB IS OUTPUT

P PACKAGE:

THERMAL RESISTANCE-JUNCTION TO TAB, θθ

θθ

θJT 3.0°C/W

THERMAL RESISTANCE-JUNCTION TO AMBIENT, θθ

θθ

θJA 60°C/W

DD PACKAGE:

THERMAL RESISTANCE-JUNCTION TO TAB, θθ

θθ

θJT 3.0°C/W

THERMAL RESISTANCE-JUNCTION TO AMBIENT, θθ

θθ

θJA 60°C/W

Junction Temperature Calculation: TJ = TA + (P D 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.

THERMAL DATA

RoHS Peak Package Solder Reflow Temp. (40 seconds max. exposure).................... 260°C (+0, -5)

RoHS 100% Matte Tin Lead Finish

7A V

ERY

ROPOUT

OSITIVE

DJUSTABLE

EGULATOR

LX8580

PRODUCT DATABOOK 1996/1997

Rev. 1.1

PRODUCTION DATA SHEET

Reference Voltage VREF VCTRL = 2.75V, VPWR = 2V, ILOAD = 10mA, TJ = 25°C

VCTRL

= 2.7V to 6V,

VPWR

= 1.75V to 5.5V, I

OUT

= 10mA to 4A

VCTRL

= 2.7V to 6V,

VPWR

= 2.05V to 5.5V, I

OUT

= 10mA to 7A

Line Regulation ∆VREF (VIN)

CTRL

= 2.5V to 12V, V

PWR

= 1.75V to 5.5V, I

LOAD

= 10mA, T

= 25°C

CTRL

= 2.5V to 12V, V

PWR

= 1.75V to 5.5V, I

LOAD

= 10mA

Load Regulation

∆V

REF

OUT

)

VCTRL = 2.75V, VPWR = 2.1V, ILOAD = 10mA to 7A (VADJ = 0)

Thermal Regulation ∆VOUT (Pwr) 30ms Pulse

Thermal Resistance RθJT Control Circuitry/Power Transistor

Ripple Rejection VCTRL = VPWR = 3.75V Avg, VRIPPLE = 1VP-P, VADJ = 0V, IOUT = 4A

Control Pin Current (Note 3) ICTRL VCTRL = 2.75V, VPWR = 2.05V, ILOAD = 100mA

VCTRL = 2.75V, VPWR = 2.05V, ILOAD = 4A

VCTRL = 2.75V, VPWR = 1.75V, ILOAD = 4A

VCTRL = 2.75V, VPWR = 2.05V, ILOAD = 7A

Adjust Pin Current IADJ VCTRL = 2.75V, VPWR = 2.05V, ILOAD = 0mA (VADJ = 0)

Current Limit Iθ(MAX) VCTRL = 2.75V, VPWR = 2.05V, ∆VOUT = 100mV (VADJ = 0)

Dropout Voltage (Control Section) VCTRL - VOUT VPWR = 2.05V, ILOAD = 100mA

Minimum VCTRL (Note 2) VPWR = 2.05V, ILOAD = 1A

(VPWR - VOUT)V

PWR = 2.05V, ILOAD = 2.75A

VPWR = 2.05V, ILOAD = 4A

VPWR = 2.05V, ILOAD = 7A

Dropout Voltage (Power Section) VPWR - VOUT VCTRL = 2.75V, ILOAD = 100mA

Minimum VPWR (Note 2) VCTRL = 2.75V, ILOAD = 1A

(VPWR - VOUT)V

CTRL = 2.75V, ILOAD = 2.75A

(VADJ = 0) VCTRL = 2.75V, ILOAD = 4A, TJ = 25°C

VCTRL = 2.75V, ILOAD = 4A

VCTRL = 2.75V, ILOAD = 7A, TJ = 25°C

VCTRL = 2.75V, ILOAD = 7A

Minimum Load Current VCTRL = 5V, VPWR = 3.3V, VADJ = 0V

ELECTRICAL CHARACTERISTICS

(Unless otherwise specified, these specifications apply over the operating ambient temperatures 0°C ≤ TA ≤ 125°C. Low duty cycle pulse testing

techniques are used which maintains junction and case temperatures equal to the ambient temperature.)

Parameter

Symbol

Test Conditions Units

LX8580

Min. Typ. Max.

1.243 1.250 1.257 V

1.237 1.250 1.263 V

13mV

26mV

27mV

0.002 0.020 %/W

0.65 2.70 °C/W

60 80 dB

310mA

30 60 mA

33 70 mA

60 120 mA

60 120 µA

7.1 9 A

0.90 1.15 V

1.00 1.15 V

1.05 1.18 V

1.06 1.20 V

1.10 1.30 V

0.05 0.17 V

0.10 0.22 V

0.20 0.38 V

0.30 0.40 V

0.30 0.50 V

0.52 0.62 V

0.56 0.80 V

510mA

Note 2. Dropout is caused by either minimum control voltage (VCTRL) or minimum power voltage (VPWR). Both parameters are specified with respect to

the output voltage. The specifications represent the minimum input/output voltage required to maintain 1% regulation.

Note 3. The control pin current is the drive current required for the output transistor. This current will track output current with roughly a 1:100 ratio.

The minimum value is equal to the quiescent current of the device.

7A V

ERY

ROPOUT

OSITIVE

DJUSTABLE

EGULATOR

LX8580

PRODUCT DATABOOK 1996/1997

PRODUCTION DATA SHEET

Rev. 1.1

SENSE 1

ADJUST 2

OUTPUT 3

VCTRL 4

VPWR 5

This pin is the positive side of the reference voltage for the device. With this pin it is possible to Kelvin-sense the output voltage

at load.

This pin is the negative side of the reference voltage for the device. Ripple rejection can be improved by adding a small bypass capacitor

from the Adjust pin to ground. The capacitor value should be selected so that CR ≤ 1 / 2πFRRA , where FR is the ripple frequency

and RA is the value of the resistor between the output and sense leads of the LX8580.

This is the power output of the device.

This pin is the voltage supply pin for the control circuitry of the device. The current flow into this pin will be about 1% of the output

current. For the device to regulate, the voltage at this pin must be between 1.0V and 1.3V greater than the output voltage.

This is the collector of the power section of the LX8580. The output load current is supplied through this pin. For the device to

regulate, the voltage at this pin must be between 0.1V and 0.8V greater than the output voltage (higher output currents require higher

voltages between VPWR and OUTPUT).

Pin # Description

FUNCTIONAL PIN DESCRIPTION

BASIC APPLICATION CIRCUIT

LX8580

LOAD

6000µF

(4X Sanyo 6mV 1500G

6.3V 1500µF)

Tantalum

33µF 10V

5.0V

Tantalum

100µF

10V

OUT

= 2.775 2.89 (MAX)

2.67 (MIN)

1219

1479

PWR

CTRL

ADJUST

SYSTEM GROUND

0.259

"Electronic Heatsink"

Resistor reduces

thermal load

on LDO heatsink

to 6.9W

OUTPUT

SENSE

4 x 19 2W 5%

(Parallel Connected)

*Note

*Note: For improved transient response, add capacitor as shown (typical 15µF).

PRODUCTION DATA - Information contained in this document is proprietary to LinFinity, and is current as of publication date. This document

may not be modified in any way without the express written consent of LinFinity. Pr oduct processing does not necessarily include testing of all

parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.