11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
LX8221
TM
®
Dual 150mA CMOS Low Dropout Regulator
P
RODUCTION
D
ATA
S
HEET
RECOMMENDED OPERATING CONDITIONS
Parameter
Input Operating Voltage Range (Note 1)
Enable Input Voltage Range
Continuous Output Current Range
Input Capacitor (V
IN
to GND)
Output Capacitor (V
OUT
to GND)
WWW .
Microsemi
.C
OM
Symbol
VIN1, VIN2
EN1/2
I
OUT
1,
I
OUT
1
C
IN
C
OUT
Min
2.5
LX8221
Typ
Max
6
V
IN
+ 0.3V
Units
V
V
mA
µF
µF
150
1.0*
1.0*
2.2
Note 1: The minimum V
IN
has to meet two conditions V
IN
> 2.5V and V
IN
> V
OUT
+ V
DROPOUT
, at high line voltage conditions output current may be limited to less than
150mA due to the power dissipation.
* Size your output capacitor to meet the transient loading requirement. If you have a very dynamic load, a lower ESR and larger value capacitor will improve the response to
these load steps.
Unless otherwise specified, the following specifications apply over the operating ambient temperature -40°C
≤
T
A
≤
85°C except
where otherwise noted. Test conditions:
V
IN
= V
OUT
+ 0.5V; I
OUT
=10mA; C
IN
= 1
µ
F; C
OUT
= 1
µ
F; T
J
= T
A
using low duty cycle pulse
testing methods.
LX8221
Parameter
Symbol
Test Conditions
Units
Min
Typ
Max
Output Voltage (2.5, 2.7, 3.0, ADJ)
Adjust Reference Voltage
Line Regulation
VOUT1/2
V
ADJ
V
RV
V
RI
T
J
= 25°C
0mA
≤
I
OUT1/2
≤
100mA, (V
OUT1/2
+ 0.5V)
≤
V
IN
≤
6V
T
J
= 25°C
0mA
≤
I
OUT1/2
≤
100mA, 2.85V
≤
V
IN
≤
6V
(V
OUT1/2
+ 0.5V)
≤
V
IN
≤
5V, I
OUT1/2
= 0.1mA
T
J
= 25°C, 0.5mA
≤
I
OUT1/2
≤
150mA
0.5mA
≤
I
OUT1/2
≤
100mA
I
LOAD1/2
= 1mA,
Δ
VO
= -1%
I
LOAD1/2
= 50mA,
Δ
VO
= -1%
I
LOAD1/2
= 100mA,
Δ
VO
= -1%
I
LOAD1/2
= 150mA,
Δ
VO
= -1%
EN1 = High, EN2 = High
EN1 = Low, EN2 = Low
V
ADJ
= 1.25V
V
EN1/2
= V
IN
2.0
0.4
VOUT1 = 0V, VOUT2 = 0V
T
J
= 25°C, f = 120Hz
T
J
= 25°C, C
OUT
= 10µF,C
BYPASS
= 470pF
400
50
50
170
-1
-2.5
1.163
1.140
1
2.5
1.187
1.210
0.15
%
V
%/V
%V
NOM
ELECTRICAL CHARACTERISTICS
1.175
0.04
0.5
⎛ Δ
V
O
⎞
⎜
Δ
V
IN
⎟
⎝
⎠
⎛ Δ
V
O
⎞
Load Regulation
⎜
Δ
I
O
⎟
⎝
⎠
1.5
0.050
0.175
0.3
0.4
440
1
100
100
Dropout Voltage
(Note 2)
(
V
IN
−
V
O
)
V
DO
I
GND
I
STBY
I
ADJ
I
EN
V
EN(IH)
V
EN(IL)
I
OUT(SC)
PSRR
Ground Pin Current
Adjust Input Bias Current
Enable Pin Current
Enable Threshold
Short Circuit Current Limit
Power Supply Rejection Ratio
Output Noise
Thermal Shutdown Temperature
0.175
0.25
280
V
µA
nA
nA
V
mA
dB
µV
°C
e
N
T
SD
E
LECTRICALS
E
LECTRICALS
Note 2: Dropout voltage is defined as the input to output differential at which the output voltage drops 1% below the nominal value. Dropout voltage specification
applies only to output voltages greater than 2.8V. For output voltages below 2.8V, the dropout voltage is nothing but the input to output differential, since the
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