LX2172CM Ver la hoja de datos (PDF) - Microsemi Corporation
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LX2172CM Datasheet PDF : 6 Pages
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PRODUCT DATABOOK 1996/1997
LX2172/73
1.25A HIGH-EFFICIENCY 100KHZ SWITCHING REGULATOR
PR E L I M I N A RY D ATA S H E E T
A B S O L U T E M A X I M U M R AT I N G S (Note 1)
Supply Voltage (VIN) .................................................................................................... 25V
Collector Supply Voltage (V ) ..................................................................................... 65V
C
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
Pb-free / RoHS Peak Package Solder Reflow Temp (40 second max. exposure)................. 260°C (+0, -5)
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.
T H E R MAL DATA
M PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
DM PACKAGE:
95°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
P PACKAGE:
165°C/W
THERMAL RESISTANCE-JUNCTION TO TAB, θJT
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
4.5°C/W
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.
V IN
V IN 5
1 .4 V
GND 1
E N A B LE
VO
(N O T E 1 )
FB 3
BLOCK DIAGRAM
E N A B LE
COM P
0 .1 5 V
EN
2 .3 V
V REG
S .D .
COM P
1 .2 7 V
E .A .
gM
V REG
2 .3 V
V REG
U V LO C O M P
PW M
COM P
PW M
LA TC H
R
Q
PACKAGE PIN OUTS
GND 1
VC
2
FB 3
* SYNC / ENABLE 4
8
E2
7
VSW
6
E1
5
VIN
M PACKAGE
(Top View)
RoHS / Pb-free 100% Matte Tin Lead Finish
GND
VC
FB
* SYNC / ENABLE
1
8
E2
2
7
VSW
3
6
E1
4
5
VIN
DM PACKAGE
(Top View)
* Pin 4 = SYNC for LX2172, ENABLE for LX2173/2174
RoHS / Pb-free 100% Matte Tin Lead Finish
TAB IS GND
5
1
P PACKAGE
(Top View)
VIN
VSW
GND
FB
VC
V IN
7
VO
SW
Q1 Q2
VC 2
1 .4 V
250m V
V O FS
(0 .9 V )
S
Q
EN
100 kH z
O SC
IN
100kH z
C .S .
AM P
S LO P E C O M P
(N O T E 1 )
SYNC
68
E1 E2
Note 1: LX2172 Only: SYNC brought out to pin 4. ENABLE is tied to VIN. LX2173 Only: ENABLE brought out to pin 4. SYNC is open.
2
Copyright © 1998
Rev. 0.4a 12/04
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