LX2172 datasheet(2/6 Pages) MICROSEMI

2 / 6 page

1.25A HIGH-EFFICIENCY 100KHZ SWITCHING REGULATOR

LX2172/73

PRODUCT DA T ABOOK 1996/1997

Rev. 0.4

a 12/04

P RELIMINAR Y D AT A S HEET

ABSOLUTE MAXIMUM RATINGS

(Note 1)

Supply Voltage (V

IN) .................................................................................................... 25V

Collector Supply Voltage (V

C) ..................................................................................... 65V

Digital Inputs (SYNC) ......................................................................................... -0.3 to 7V

Operating Junction Temperature ................................................................. 0°C to 125°C

Storage Temperature Range .................................................................... -65°C to +150°C

Solder Temperature (Soldering, 10 seconds) .......................................................... 300°C

PACKAGE PIN OUTS

GND

* SYNC / ENABLE

M PACKAGE

(Top View)

DM PACKAGE

(Top View)

GND

* SYNC / ENABLE

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

M PACKAGE:

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

θθθθθ

95°C/W

DM PACKAGE:

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

θθθθθ

165°C/W

P PACKAGE:

THERMAL RESISTANCE-JUNCTION TO TAB,

θθθθθ

4.5°C/W

THERMAL RESISTANCE-JUNCTION TO AMBIENT,

θθθθθ

60°C/W

Junction Temperature Calculation:

J = TA + (PD x θJA).

The

JA numbers are guidelines for the thermal performance of the device/pc-board system.

All of the above assume no ambient airflow.

GND

P PACKAGE

(Top View)

TAB IS GND

* Pin 4 = SYNC for LX2172, ENABLE for LX2173/2174

V IN

GN D

EN ABL E

F B

V C

SYN C

S W

100 k H z

OS C

250m V

1. 4V

C. S .

AM P

PW M

CO M P

PW M

LA T C H

0. 15V

S. D .

CO M P

E. A.

1. 27V

g M

1. 4V

EN ABL E

CO M P

2. 3V

V RE G

UV L O CO M P

V IN

V O

(N O T E 1 )

V OF S

(0 . 9 V )

V O

2. 3V

V RE G

SL O PE C O M P

100k H z

Note 1: LX2172 Only: SYNC brought out to pin 4. ENABLE is tied to V

IN.

LX2173 Only: ENABLE brought out to pin 4. SYNC is open.

BLOCK DIAGRAM

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

RoHS / Pb-free 100% Matte Tin Lead Finish

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