LX8821 datasheet(2/6 Pages) MICROSEMI

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PRODUCTION DATA SHEET

Microsemi

Microsemi Microelectronics Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 2

Rev. 1.1, 2005-03-09

LX8821

DUAL CHANNEL 2.5A LOW DROPOUT REGULATOR

ABSOLUTE MAXIMUM RATINGS

Input Voltage (VCTRL, VPWR).........................................................................13.5V

Load Current (Internally Limited) ..................................................................3.0A

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

Short-Circuit Protection .......................................................................... Indefinite

Operating Junction Temperature.................................................................. 150

°C

Storage Temperature Range...........................................................-65

°C to 150°C

Peak Package Solder Reflow Temperature

(40 second maximum exposure) ..................................................... 260°C (+0, -5)

Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to

Ground. Currents are positive into, negative out of specified terminal

TH ERMAL DATA

DF Plastic S-Pak 7-Pin

THERMAL RESISTANCE

-JUNCTION TO TAB,

4.5

°C/W

THERMAL RESISTANCE

-JUNCTION TO AMBIENT,

20 - 50

°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.

θJA can vary from 10°C/W to > 50°C/W

depending on mounting technique. (See Application Notes Section: Thermal considerations)

PACKAGE PIN OUT

DF PACKAGE

(Top View)

CTRL

OUT1

PW R

GND

OUT2

TAB is GND

ADJ

Pin 4 and Tab are common

RoHS 100% Matte Tin Lead Finish

FUNCTIONAL PIN DESCRIPTION

NAME

DESCRIPTION

VCTRL

Unregulated input voltage supply, provides bias for control circuitry, (VCTRL – VOUT) > 1V.

VOUT1

Regulator #1 fixed output voltage, 1.5V nominal.

VPWR

Unregulated input voltage supply for power section. For proper operation: (VPWR – VOUT) > VDROPOUT.

GND

Common terminal for ground reference, Tab of package is internally connected to this pin.

VOUT2

Regulator #2 output

ADJ V2

Regulator #2 feedback voltage, servos to 1.25V. Using external resistors to program VOUT2.

---

Not used, no internal connection, may be left floating or connected to any other pin or voltage.

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