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
APL1087
APL1087
VIN
IN
OUT
VOUT
VIN
IN
OUT
ADJ
VOUT
R1
ADJ
+
121Ω
R1
+
10µ F
1 0 0 µ F
150µ F
+
+
1 0 µ F
*
C2
*
C*3
10µF
C1
R2
R2
* Needed if device is far from filter capacitors
* C3 improves ripple rejection.
XC should be approximately
R1+R2
VOUT = 1.250V×
equal to R1 at ripple frequency
R1
5V Regulator with Shutdown
APL1087
VIN
IN
OUT
ADJ
5V
121Ω
1%
+
1 0 µ F
+
1k
1 0 0 µ F
TTL
365Ω
1%
1k
Copyright ANPEC Electronics Corp.
Rev. A.8 - Mar., 2004
4
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
