LND2931
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
L
= 1mA, for I
L
=100µA and T
J =
125ºC, line regulation is
guaranteed by design to 0.2%. For LND2931-15 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: Ground 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 output voltage at a time T after a change in power dissipation,
excluding load or line regulation effects. Specifications are for a 50mA load pulse (1.25W pulse) for
T=10ms.
Note7: Vref
≤
V
out
≤
(Vin-1V), 2.3V
≤
Vin
≤
26V, 100µA
≤
I
L
≤
100mA, T
J
≤
T
jmax.
Note 8: Vshutdown
≥
2V, V
IN
≤
26V, Vout =0V.
BLOCK DIAGRAM AND TYPICAL APPLICATIONS
Figure 1: Fixed Regulator
Unregulated DC
+
INPUT
OUTPUT
5V
I <= 100mA
L
+
-
ERROR
AMPLIFIER
60k
+
See
Application
Hints
182k
+
1.23 V
Reference
GROUND
Figure 2:Adjustable Regulator
Unregulated DC
7
+
FEEDBACK
INPUT
8
1
OUTPUT
R1
0.01
µ
F
Vout 1.2A->24A
I <= 100mA
L
+
-
From
CMOS
or
TTL
5
SHUTDOWN
ERROR
AMPLIFIER
+
R2
3.3
µ
F
60k
+
1.23 V
Reference
2,3,6,7
GROUND
•
Linear Dimensions, Inc.
•
445 East Ohio Street, Chicago IL 60611 USA
•
tel 312.321.1810
•
fax 312.321.1830
•
•
LINEAR_DIMENSIONS [ LINEAR DIMENSIONS SEMICONDUCTOR ]
