LX8940 Microsemi Corporation, LX8940 Datasheet

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LX8940

Manufacturer Part Number
LX8940
Description
5v Low Dropout Regulator
Manufacturer
Microsemi Corporation
Datasheet
Copyright © 2000
Rev. 1.3a, 2005-11-18
low quiescent current regulator rated
for 1A of output current. It can
regulate with as low as 0.4V
headroom between the input and
output voltages, thus minimizing
power dissipation. In addition, it can
be used in applications where worst
IMPORTANT: For the most current data, consult MICROSEMI’s website:
5.3V
The LX8940 is a 5V, low dropout,
TM
0.1µF
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
100mA
P R O D U C T H I G H L I G H T
5.00V
4.98V
0mA
VIN
T
C
V
LX8940
A
IN
IN
= 25°C
= 1µF
= 5.3V
D E S C R I P T I O N
Load Transient Response
Part
GND
C
O
= 47µF Electrolytic
Note: Available in Tape & Reel. Append the letters “TR” to the part
number. (i.e. LX8940IP-TR)
-40 to 125
OUT
0 to 125
Time
T
A
case supplies require a low input-output
differential to maintain regulation. This
feature makes it ideal for computer
monitors that have to comply with
energy-efficient / "Green PC" programs,
where the input voltage drops to only a
few tenths of a volt above the output
when power supply enters sleep-mode
operation.
(20µS / Div.)
(°C)
P A C K A G E O R D E R I N F O
Integrated Products Division
®
Microsemi
http://www.microsemi.com
P
10µF
RoHS Compliant / Pb-free
Plastic TO-220
3-Pin
Transition DC: 0543
5V / 100mA
LX8940CP
LX8940IP
600
500
400
300
200
100
0
5V Low Dropout Regulator
P
Dropout Voltage vs. Output
RODUCTION
100
Current v.s Temperature
25°C
Output Current
125°C
500
-40°C
2% Internally Trimmed Output
Output Current In Excess Of
1A
Input-Output Differential Less
Than 0.4V At 1A
Reverse Battery Protection
60V Load Dump Protection
-50V Reverse Transient
Protection
Short Circuit Protection
Internal Thermal Overload
Protection
Available In 3-Lead Plastic TO-
220
Drops In Most lM2940 Sockets
Small Headroom Battery
Applications
High Efficiency Linear
Regulators
Post Regulators For Switching
Power Supplies
Green PC Monitor Applications
D
ATA
(mA)
K E Y F E A T U R E S
A P P L I C A T I O N S
S
1000
HEET
LX8940
Page 1

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LX8940 Summary of contents

Page 1

... The LX8940 is a 5V, low dropout, low quiescent current regulator rated for 1A of output current. It can regulate with as low as 0.4V headroom between the input and output voltages, thus minimizing power dissipation. In addition, it can be used in applications where worst IMPORTANT: For the most current data, consult MICROSEMI’ ...

Page 2

... Integrated Products Division LX8940 RODUCTION ATA HEET TAB is GND ACKAGE (Top View) RoHS / Pb-free 100% matte Tin Lead Finish LX8940 Symbol Min Typ Max VIN Note 1000 60 0.1 10 Output GND Input Units ...

Page 3

... TM Unless otherwise specified, the following specifications apply over the operating ambient temperature -40°C to +125°C for the LX8940IP and 0°C to +125°C for LX8940CP techniques are used which maintains junction and case temperatures equal to the ambient temperature.) Parameter SECTION HEADER ...

Page 4

... TM The advantages of using a low-dropout regulator such as the LX8940 is the need for less “headroom” for full regulation, and the inherent reverse polarity protection provided by the PNP output device. A typical NPN regulator design requires an input to output differential of approximately two volts minimum. This is due to the 2Vbe + Vcesat of the NPN Darlington used in the output, coupled with the voltage drop across the current limit resistor ...

Page 5

... S 1. 5.84 U 0.508 Note: 1. Dimensions do not include mold flash or protrusions; J these shall not exceed 0.155mm(.006”) on any side. Lead dimension shall not include solder coverage. Microsemi Integrated Products Division LX8940 D S ATA HEET I ILLIMETERS NCHES MAX MIN MAX 15.88 0.560 0.625 10 ...

Page 6

... Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. Copyright © 2000 Rev. 1.3a, 2005-11-18 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 ® 5V Low Dropout Regulator P RODUCTION Microsemi Integrated Products Division LX8940 D S ATA HEET Page 6 ...

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