LIN D
O C
#:
8940
LX8940
5V L
OW
D
T
H E
R O P O U T
R
E G U L ATOR
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
P
R O D U C T I O N
D
A T A
S
H E E T
DESCRIPTION
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 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.
K E Y F E AT U R E S
s
2% Internally Trimmed Output
s
Output Current In Excess Of 1A
s
Input-Output Differential
Less Than 0.4V At 1A
p
Reverse Battery Protection
p
60V Load Dump Protection
p
-50V Reverse Transient Protection
p
Short Circuit Protection
p
Internal Thermal Overload Protection
p
Available In 3-Lead Plastic TO-220
p
Drops In Most lM2940 Sockets
NOTE:
For current data & package dimensions, visit our web site:
http://www.linfinity.com.
PRODUCT HIGHLIGHT
A P P L I C AT I O N S
5.3V
0.1碌F
IN
LX8940
GND
OUT
10碌F
5V/100mA
s
Small Headroom Battery Applications
s
High Efficiency Linear Regulators
s
Post Regulators For Switching Power
Supplies
s
Green PC Monitor Applications
L
OAD
T
RANSIENT
R
ESPONSE
Output Voltage
T
A
= 25掳C C
O
= 47碌F Electrolytic
C
IN
= 1碌F
V
IN
= 5.30V
5.000V
D
R O P O U T
V
O L TA G E V S
. O
U T P U T
C
U R R E N T
V S
. T
E M P E R AT U R E
600
(20mV / Div.)
500
125掳C
Dropout Voltage - (mV)
400
4.980V
25掳C
300
Output Current
(50mA / Div.)
100mA
200
-40掳C
100
0mA
0
Time - (20碌s/Div.)
100
500
1000
Output Current - (mA)
PA C K A G E O R D E R I N F O
T
A
(掳C)
0 to 125
-40 to 125
P
Plastic TO-220
3-pin
LX8940CP
LX8940IP
Copyright 漏 1999
Rev. 1.3 3/99
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
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