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
+
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