APL1087
Electrical Characteristics (Cont.)
Note 1: See thermal regulation specifications for changes in output voltage due to heating effects. Load line regulations are mea-
sured at a constant junction temperature by low duty cycle pulse testing.
Note 2: Dropout voltage is specified over the full output current range of the device. Dropout voltage is defined as the minimum input/
output differential measured at the specified output current. Test points and limits are also shown on the Dropout Voltage curve.
Note 3: Minimum load current is defined as the minimum output current required to maintain regulation.
Application Circuits
1.25V to 7.15V Adjustable Regulator
Improving Ripple Rejection
A P L108 7
V
IN
IN
ADJ
OUT
R1
12 1
Ω
+
10µ
F
C
*
1
APL1087
V
OUT
V
IN
10µ
F
IN
+
OUT
ADJ
V
OUT
R1
150
µ
F
R2
+
C
*
3
+
R2
100µ
F
C
*
2
10µ
F
* Needed if device is far from filter capacitors
* C
3
improves ripple rejection.
X
C
should be approximately
equal to R1 at ripple frequency
V
OUT
=
1.250V
×
R1
+
R2
R1
5V Regulator with Shutdown
A P L1087
V
IN
+
10µ
F
IN
O UT
ADJ
5V
121
Ω
1%
+
365
Ω
1%
1k
TTL
1k
100µ
F
Copyright
ANPEC Electronics Corp.
Rev. A.8 - Mar., 2004
4
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
