LND48XX
DATA SHEET
GENERAL DESCRIPTION
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 TO220 package compatible with other fixed voltage
regulators. Adjust model is offered in 5-pin TO220 package and fixed model with shutdown
input is offered in 4-pin TO-220 package.
400mA Low Dropout Voltage Regulators
FEATURES
• 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.
APPLICATIONS
PIN DIAGRAM
Output
Common
Input
TO – 220 Package
• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 •
• High-efficiency linear regulator
• Battery powered systems
• Portable/palm top/ notebook
Computers
• Portable consumer equipment
• Portable instrumentation
• Automotive Electronics
• SMPS Post Regulator
www.lineardimensions.com
•
ABSOLUTE MAXIMUM RATINGS
Power Dissipation Internally Limited
Lead Temperature(Soldering, 5 seconds) 260ºC
Storage Temperature Range -65ºC to +150ºC
Operating Junction Temperature Range -55ºC to +150ºC
Input Supply Voltage -20V to +35V
Continuous total dissipation at 25º C free air temperature 2W
Continuous total dissipation at (or below) 25º C case temperature 15W
DEVICE SELECTION GUIDE
LND48XX
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.
• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 •
www.lineardimensions.com
•
LND48XX
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Output Voltage
Output Voltage
-25º C<=T
Full Operating Temperature
1mA<= I
<=Tjmax
<=85ºC
J
<=400mA, T
L
J
Input Supply Voltage 26
Output Voltage Temperature
Coefficient
(Note 1) 50 150 ppm/ºC
Line Regulation (Note 2) 13V<=Vin <= 26V (Note 3) 0.1 0.4 %
Load Regulation(Note 2) 1mA<= IL <=400mA 0.1 0.3 %
=150mA
I
Dropout Voltage(Note 4)
Ground Current (Note 5)
Dropout Ground
Current(Note 5)
L
=400mA
I
L
I
=100µA
L
=150µA
I
L
=400µA
I
L
Vin=Vout-0.5V I
=100µA 110 220 µA
L
Current Limit Vout=0 350 500 mA
Thermal Regulation (Note 6) 0.05 0.2 %/W
=2.2µF
C
Output Noise, 10Hz to
100KHz I
= 100mA
L
Ripple Rejection Ratio
L
=3.3µF
C
L
=33µF
C
L
I
=350mA,f=120Hz,
O
Co=100µF, V
IN
=Vo+3V+2V
Adjust model
Reference Voltage 1.21 1.235 1.26
Reference Voltage Over Temperature (Note 7) 1.185 1.285
Feedback Pin Bias Current 20 40 nA
Reference Voltage
Temperature Coefficient
(Note 1) 50 ppm/ºC
Feedback Pin Bias Current
Temperature coefficient
Shutdown Input
Input Logic Voltage
Shutdown Pin Input Current
Low(Regulator ON)
High (Regulator OFF) 2
= 2.4V
V
S
= 26V
V
S
(Note 8)
0.985 |Vo|
0.98 |Vo|
Vo
0.975 |Vo| Vo 1.025 |Vo|
200
420
100
12
30
500
350
120
PP
60 dB
0.1 nA/ºC
1.3 0.7
30
450
1.015 |Vo|
1.02 |Vo|
400
700
200
20
50
50
600
mV
mA
mA
µV RMS
V
µA
V
V
Regulator Output Current in
Shutdown
5.0V<=Vout<15.0V 10
3.3V<=Vout<5.0 V 20
2.0V<=Vout<3.3V 30
• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 •
µA
www.lineardimensions.com
•
LND48XX
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 150ºC for I
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,100µA <= I
Note 8: Vshutdown >=2V, Vin <=26V, Vout =0v.
BLOCK DIAGRAM and TYPICAL APPLICATIONS
Unregulated DC
=5mA. For IL =100µA and T
L
<=400mA, TJ <= T
L
125ºC, line regulation is guaranteed by design to
J =
jmax.
From
CMOS
or
TTL
+
SHUTDOWN
+
1 F
Unregulated DC
3
+
µ
FEEDBACK
INPUT
+
-
+
1.23 V
Reference
ERROR
AMPLIFIER
OUTPUT
GROUND
+
6.8 F
µ
5V
<= 400mA
Fig 1 : Fix ed Regulator
1.2 --> 24 V
+
Vout
400mA Max
µ
6.8 F
8
7
INPUT
+
ERROR
AMPLIFIER
1
OUTPUT
V 1.23V
Ref
1 F
R1
R2
µ
Off
On
+
1.23 V
Reference
GROUND
V = V (1+ R1/R2)
OUT REF
Fig 2 : Adjustable Regulat or
• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 •
www.lineardimensions.com
•
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