LND48XX
400mA Low Dropout Voltage Regulators
TO 220 Package
DATA SHEET
GENERAL DESCRIPTION
400mA output within 2% over
temperature
Very low quiescent current
Low dropout voltage (420mV Typ)
Extremely tight load and line regulation
Very low temperature coefficient
Current and thermal limiting
Unregulated DC input can withstand
20V reverse battery and +60V positive
transients
Direct replacement for SGS-Thomson-
L48XX Series, but has lower ground
current, higher accuracy of output
voltage and extremely tight load and
line regulation. The 5 pin version
(adjust model) and 4 pin version (fixed
model) have a shutdown input.
FEATURES
This series of fixed-voltage monolithic
micropower voltage regulators is designed for a
wide range of applications. This device is an
excellent choice for use in battery-powered
application. Furthermore, the quiescent current
increases only slightly at dropout, which
prolongs battery life.
This series of fixed-voltage regulators features
very low quiescent current(100mA Typ.) and
very low drop output voltage (Typ. 60mV at light
load and 420mV at 400mA). This includes a
tight initial tolerance of 0.5%typ. Extremely good
load and line regulation of 0.05% typ., and very
low output temperature coefficient. This series
of fixed-voltage regulators is offered in 3-pin TO-
220 package compatible with other fixed voltage
regulators. Adjust model is offered in 5-pin TO-
220 package and fixed model with shutdown
input is offered in 4-pin TO-220 package.
APPLICATIONS
High-efficiency linear regulator
Battery
powered
systems
Portable/palm top/ notebook
Computers
Portable consumer equipment
Portable
instrumentation
Automotive
Electronics
SMPS Post Regulator
Linear Dimensions, Inc. 445 East Ohio Street, Chicago IL 60611 USA tel 312.321.1810 fax 312.321.1830
www.lineardimensions.com
PIN DIAGRAM
Output
Common
Input
Power Dissipation
Internally Limited
Lead Temperature(Soldering, 5 seconds)
260C
Storage Temperature Range
-65C to +150C
Operating Junction Temperature Range
-55C to +150C
Input Supply Voltage
-20V to +35V
Continuous total dissipation at 25 C free air temperature
2W
Continuous total dissipation at (or below) 25 C case temperature
15W
Vout , VOLTS
Device
3.3V*
LND4833
5V
LND4805
8V
LND4808
8.5V
LND4885
9V
LND4809
10V
LND4810
12V
LND4812
15V
LND4815
Adj.
LND48-adj
* Other fixed versions are also available Vout=2.0 V to 5.0V
Please Consult Linear Dimensions for Information.
ABSOLUTE MAXIMUM RATINGS
LND48XX
DEVICE SELECTION GUIDE
Linear Dimensions, Inc. 445 East Ohio Street, Chicago IL 60611 USA tel 312.321.1810 fax 312.321.1830
www.lineardimensions.com
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage
-25 C<=T
J
<=85C
Full Operating Temperature
0.985 |Vo|
0.98 |Vo|
Vo
1.015 |Vo|
1.02 |Vo|
Output Voltage
1mA<= I
L
<=400mA, T
J
<=Tjmax
0.975 |Vo|
Vo
1.025 |Vo|
Input Supply Voltage
26
V
Output Voltage Temperature
Coefficient
(Note 1)
50
150
ppm/C
Line Regulation (Note 2)
13V<=Vin <= 26V (Note 3)
0.1
0.4
%
Load Regulation(Note 2)
1mA<= I
L
<=400mA
0.1
0.3
%
Dropout Voltage(Note 4)
I
L
=150mA
I
L
=400mA
200
420
400
700
mV
Ground Current (Note 5)
I
L
=100A
I
L
=150A
I
L
=400A
100
12
30
200
20
50
A
mA
mA
Dropout Ground
Current(Note 5)
Vin=Vout-0.5V I
L
=100A
110
220
A
Current Limit
Vout=0
350
500
mA
Thermal Regulation (Note 6)
0.05
0.2
%/W
Output Noise, 10Hz to
100KHz I
L
= 100mA
C
L
=2.2F
C
L
=3.3F
C
L
=33F
500
350
120
V RMS
Ripple Rejection Ratio
I
O
=350mA,f=120Hz,
Co=100F, V
IN
=Vo+3V+2V
PP
60
dB
Adjust model
Reference Voltage
1.21
1.235
1.26
Reference Voltage
Over Temperature (Note 7)
1.185
1.285
V
Feedback Pin Bias Current
20
40
nA
Reference Voltage
Temperature Coefficient
(Note 1)
50
ppm/C
Feedback Pin Bias Current
Temperature coefficient
0.1
nA/C
Shutdown Input
Input Logic Voltage
Low(Regulator ON)
High (Regulator OFF)
2
1.3
0.7
V
Shutdown Pin Input Current
V
S
= 2.4V
V
S
= 26V
30
450
50
600
(Note 8)
5.0V<=Vout<15.0V
10
3.3V<=Vout<5.0 V
20
Regulator Output Current in
Shutdown
2.0V<=Vout<3.3V
30
A
ELECTRICAL CHARACTERISTICS
LND48XX
Linear Dimensions, Inc. 445 East Ohio Street, Chicago IL 60611 USA tel 312.321.1810 fax 312.321.1830
www.lineardimensions.com
Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total
temperature range.
Note 2: Regulations are measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in
output voltage due to heating effects are covered under the specification for thermal regulation.
Note 3: Line regulation is tested at 150C for I
L
=5mA. For I
L
=100A and T
J =
125C, line regulation is guaranteed by design to
0.2%. For LND4815 16V<= Vin <=26V.
Note 4: Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal
value measured at 1V differential.
Note 5: Group pin current is the regulator quiescent current. The total current drawn from the source is the sum of the ground
pin current and output load current.
Note 6: Thermal Regulation is the change in the output voltage at a time T after a change in power dissipation, excluding load
or line regulation effects. Specifications are for a 200mA load pulse (3W pulse) for T=10ms.
Note 7: Vref <=Vout <=(Vin 1V), 2.3V<=Vin <=26V,100A <= I
L
<=400mA, T
J
<= T
jmax.
Note 8: Vshutdown >=2V, Vin <=26V, Vout =0v.
LND48XX
BLOCK DIAGRAM and TYPICAL APPLICATIONS
Linear Dimensions, Inc. 445 East Ohio Street, Chicago IL 60611 USA tel 312.321.1810 fax 312.321.1830
www.lineardimensions.com
5V
OUTPUT
1.23 V
Reference
+
ERROR
AMPLIFIER
+
<= 400mA
GROUND
Unregulated DC
-
+
INPUT
+
1 F
6.8 F
Fig 1 : Fixed Regulator
+
Vout
400mA Max
GROUND
INPUT
+
-
ERROR
AMPLIFIER
+
FEEDBACK
+
1.23 V
Reference
OUTPUT
SHUTDOWN
From
CMOS
or
TTL
Unregulated DC
1
8
7
3
6.8 F
R1
R2
1 F
V 1.23V
Ref
1.2 --> 24 V
On
Off
V = V (1+ R1/R2)
OUT
REF
Fig 2 : Adjustable Regulator
+
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