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) 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
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 -25º C<=TJ <=85ºC
Full Operating Temperature
0.985 |Vo|
0.98 |Vo| Vo 1.015 |Vo|
1.02 |Vo|
Output Voltage 1mA<= IL <=400mA, TJ
<=Tjmax 0.975 |Vo| Vo 1.025 |Vo|
Input Supply Voltage 26
V
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 %
Dropout Voltage(Note 4) IL =150mA
IL =400mA
200
420
400
700 mV
Ground Current (Note 5)
IL =100µA
IL =150µA
IL =400µA
100
12
30
200
20
50
µA
mA
mA
Dropout Ground
Current(Note 5) Vin=Vout-0.5V IL =100µA 110 220 µA
Current Limit Vout=0 350 500 mA
Thermal Regulation (Note 6) 0.05 0.2 %/W
Output Noise, 10Hz to
100KHz IL = 100mA
CL=2.2µF
CL=3.3µF
CL=33µF
500
350
120
µV RMS
Ripple Rejection Ratio IO =350mA,f=120Hz,
Co=100µF, VIN=Vo+3V+2VPP 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/ºC
Feedback Pin Bias Current
Temperature coefficient 0.1 nA/ºC
Shutdown Input
Input Logic Voltage Low(Regulator ON)
High (Regulator OFF) 2
1.3 0.7 V
Shutdown Pin Input Current VS = 2.4V
VS = 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
µA
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 150ºC for IL =5mA. For IL =100µA and TJ =125ºC, 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,100µA <= IL <=400mA, TJ <= Tjmax.
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
µ
6.8 F
µ
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
µ
6.8 F
R1
R2
µ
1 F
V 1.23V
Ref
1.2 --> 24 V
On
Off
V = V (1+ R1/R2)
OUT REF
Fig 2 : Adjustable Regulator
+
