LX8211A
TM
®
150mA Low Dropout Regulator
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION
KEY FEATURES
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Microsemi
.C
OM
The LX8211A adjustable voltage
linear regulator combines low dropout,
high accuracy, very low ground current
and fast response in a very small
footprint.
Using the Enable pin the regulator is
switched on with TTL logic levels,
which is especially useful for battery-
operated equipment.
Other features
include independent thermal and short
circuit current protection. The regulator
is stable with a low value ceramic output
capacitor.
The PNP output transistor allows for
ultra low dropout typically less than
140mV at 100mA.
Dropout Voltage Typically
140mV @ 100mA
Ultra Low Shutdown Current
Typically Less Than 1µA
High Output Accuracy Trimmed
to 0.25%
Standard Pinout in SOT-23-5
Current and Over Temperature
Protection
Stable With Low Cost Ceramic
Output Capacitor
APPLICATIONS
Battery Operated Systems
Laptop, Notebook and PDA’s
Cellular Telephones / Pagers
Hand-Held Instruments
Linear post Regulators for
SMPS
IMPORTANT:
For the most current data, consult
MICROSEMI’s
website:
http://www.microsemi.com
PRODUCT HIGHLIGHT
1
ON
V
IN
3
V
OUT
5
⎛
R2
⎞ + ⎛
⎞
V
OUT
=
V
ADJ
⎜
1
+
⎟ ⎜
I
ADJ
R2
⎟
⎝
R1
⎠ ⎝
⎠
R1
C
OUT
10µF
+
¯
C
IN
1µF
OFF
ENABLE
Part
ADJUST
GND
4
CBYP
470pF
LX8211A
2
R2
CBYP Optional for low noise
T
J
(°C)
-40 to 125
PACKAGE ORDER INFO
Plastic SOT-23
SE
5-PIN
O
UTPUT
V
OLTAGE
RoHS Compliant / Pb-free
LX8211A
LX8211A
P
ACKAGE
M
ARKING
E2C
Adjustable
LX8211A-00ISE
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8211A-25ISE-TR)
Copyright
©
2006
Rev. 1.0, 2006-04-07
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX8211A
TM
®
150mA Low Dropout Regulator
P
RODUCTION
D
ATA
S
HEET
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V
IN
) ...................................................................................... -0.3V to +15V
Enable Input ........................................................................................-0.3V to V
IN
+ 0.3V
Output Current (I
OUT
) ............................................................................................. 150mA
Maximum Junction Temperature (T
J
) ....................................................................... 150°C
Peak Package Solder Reflow Temperature (40 second max. exposure)....... 260°C (+0, -5)
Note:
Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into negative out of specified terminal.
PACKAGE PIN OUT
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Microsemi
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OM
1
2
3
SE P
ACKAGE
(Top View)
5
4
RoHS / Pb-free 100% Matte Tin Lead Finish
THERMAL DATA
SE
5-P
IN
SOT-23 P
ACKAGE
Two – Layer Board
Four – Layer Board
Thermal Resistance – Junction to Ambient,
θ
JA
220°C/W
220°C/W
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
θ
JA
).
The
θ
JA
numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow.
FUNCTIONAL PIN DESCRIPTION
P
IN
N
AME
VIN
GND
ENABLE
ADJUST
VOUT
N
UMBER
1
2
3
4
5
Unregulated Input Supply Voltage
Ground Pin
Enable Control Input, Enable High
Adjust Control Input for Resistor Divider Network.
Regulated Output Voltage. Regulator stability is achieved with an external capacitor of 10µF.
P
IN
D
ESCRIPTION
P
ACKAGE
D
ATA
P
ACKAGE
D
ATA
Copyright
©
2006
Rev. 1.0, 2006-04-07
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
LX8211A
TM
®
150mA Low Dropout Regulator
P
RODUCTION
D
ATA
S
HEET
RECOMMENDED OPERATING CONDITIONS
Parameter
Input Operating Voltage Range
(Note 1)
Minimum Output Voltage
Enable Input Voltage Range
Continuous Output Current Range
Operating Temperature Range
Input Capacitor (V
IN
to GND)
Output Capacitor (V
OUT
to GND)
Symbol
V
IN
ENABLE
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Microsemi
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OM
Min
3.0
2.3
0
0.1
LX8211A
Typ
Max
13.0
V
IN
Units
V
V
I
OUT
T
J
C
IN
C
OUT
-40
1.0
10
150
125
1.0*
mA
°C
µF
µF
Note 1: The minimum V
IN
has to meet two conditions V
IN
> 3.0V and V
IN
> V
OUT
+ V
DROPOUT
.
* 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.
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature -40°C
≤
T
J
≤
125°C except where
noted. Test conditions: V
IN
= V
OUT
+1V, V
OUT
= 2.9V; I
OUT
= 10mA; C
IN
= 1µF; C
OUT
= 10µF; T
J
= T
A
, using low duty cycle pulse testing
methods.
Parameter
Symbol
Test Conditions
Min
Adjust Reference Voltage
V
ADJ
Note 3
1.225
LX8211A
Typ
1.25
Max
1.275
V
Units
ΔV
⎞
Line Regulation
⎛
O
⎜
ΔV
IN
⎟
⎝
⎠
ΔV
⎞
Load Regulation
⎛
O
⎜
ΔI
O
⎟
⎝
⎠
V
RV
V
RI
V
IN
= V
OUT
+ 1.0 TO 13 Volts, I
OUT
=0.1mA
T
J
= 25°C, I
OUT
: 0.5 TO 150mA
I
OUT
: 0.5 TO 150mA
I
LOAD
= 10mA,
Δ
VO
= -1%
I
LOAD
= 50mA,
Δ
VO
= -1%
I
LOAD
= 100mA,
Δ
VO
= -1%
I
LOAD
= 150mA,
Δ
VO
= -1%
Enable = Hi, I
OUT
= 100mA
0.04
0.05
0.1
0.2
0.5
0.1
%/V
%V
NOM
%V
NOM
V
V
V
V
µA
µA
µA
nA
µA
V
Dropout Voltage
(
V
IN
−
V
O
)
(Note2)
V
DO
0.12
0.175
0.25
600
1300
0.23
0.3
0.35
1500
2500
5
Ground Pin Current
I
GND
Enable = Hi, I
OUT
= 150mA
Enable = Low (Standby)
Adjust Input Bias Current
Enable Pin Current
Enable Threshold
Short Circuit Current Limit
Power Supply Rejection Ratio
Output Noise
Thermal Shutdown Temperature
I
ADJ
I
EN
V
IH
V
IL
I
OUT
SC
PSRR
Current Flows Out of Pin 4
V
EN
= V
IN
2.0
50
500
25
E
LECTRICALS
E
LECTRICALS
0.18
V
OUT
= 0V
T
J
= 25°C, f = 120Hz
T
J
= 25°C, C
OUT
= 10µF
400
75
260
170
V
mA
dB
nv /√Hz
°C
e
N
T
SD
Note 2: Dropout voltage is defined as the input to output differential at which the output voltage drops 1% below the nominal value.
Note 3: Limits require operation within recommended operating conditions.
Copyright
©
2006
Rev. 1.0, 2006-04-07
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
LX8211A
TM
®
150mA Low Dropout Regulator
P
RODUCTION
D
ATA
S
HEET
BLOCK DIAGRAM
WWW .
Microsemi
.C
OM
V
IN
Thermal
Shutdown
V
OUT
Current
Limit
ENABLE
Control
Logic
ADJUST
VREF
GND
+
-
LX8211A
Figure 1
– Simplified Adjustable Version Block Diagram
B
LOCK
D
IAGRAM
B
LOCK
D
IAGRAM
Copyright
©
2006
Rev. 1.0, 2006-04-07
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX8211A
TM
®
150mA Low Dropout Regulator
P
RODUCTION
D
ATA
S
HEET
TYPICAL CHARACTERISTICS
Typical performance characteristics, unless otherwise specified are: C
IN
= 1µF, C
OUT
= 10µF, C
BY
= 470pF, V
IN
= 4V, V
OUT
= 2.9V,
T
A
= 25°C, ENABLE is tied to V
IN
.
VOUT (Programmed to 2.9V) vs. TEMPERATURE
V ADJUST vs. TEMPERATURE
1.252
V ADJUST, Volts
2.915
2.91
2.905
2.9
2.895
2.89
2.885
2.88
-50
-25
0
25
50
75
100
125
150
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Microsemi
.C
OM
1.25
V ADJUST, Volts
1.248
1.246
1.244
1.242
1.24
1.238
-50
-25
0
25
50
75
100
125
150
TEMPERATURE, °C
TEMPERATURE, °C
DROPOUT VOLTAGE (Vin=3.9V)
300
DROPOUT VOLTAGE, mV
250
200
150
100
50
0
-50
-25
0
25
50
75
100
125
150
TEMPERATURE, °C
150mA
100mA
10mA
CURRENT, mA
550
525
500
475
450
425
400
375
350
325
300
-50
SHORT CIRCUIT CURRENT vs. TEMP and VIN
VIN=13V
VIN=3.9V
-25
0
25
50
75
100
125
150
TEMPERATURE, °C
GROUND CURRENT vs IOUT (Vin=3.9V)
2.25
2.00
1.75
CURRENT, mA
1.50
1.25
1.00
0.75
0.50
0.25
0
-50
-25
0
25
50
75
100
125
150
TEMPERATURE, °C
150mA
100mA
10mA
LINE and LOAD REGULATION
0.30
0.25
VOUT, % CHANGE
0.20
0.15
LINE (3.9-13v)
0.10
0.05
0.00
-50
-25
0
25
50
75
100
125
150
LOAD(0.5MA-150MA)
C
HARTS
C
HARTS
TEMPERATURE, °C
Copyright
©
2006
Rev. 1.0, 2006-04-07
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
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