Datasheet

UCC284–5, UCC284–12, UCC284–ADJ, UCC384–5, UCC384–12, UCC384–ADJ
LOW-DROPOUT 0.5-A NEGATIVE LINEAR REGULATOR
SLUS234D – JANUARY 2000 – REVISED FEBRUARY 2002
10
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
Figure 6
UCC384–ADJ
OVERCURRENT CONDITION OPERATION
1 ms/div
Figure 7
UCC384–ADJ
OVERCURRENT CONDITION OPERATION
25 ms/div
shutdown feature of the UCC384
The shutdown feature of the UCC384 allows the device to be placed in a low quiescent current mode. The
UCC384 is shut down by pulling the SD/CT pin more positive than –0.7 V with respect to GND. Figure 8 shows
how a shutdown circuit can be configured for the UCC384 using a standard transistor-transistor logic signal to
control it.
UDG–99032
5
4
1
32
R1
R2
VOUT
VOUTS
GND
6 7
VIN VIN VIN VIN
CIN
VIN
8
CT
SD/CT
COUT
VOUT
+
+
(+)(+)
(–)
C1
UCC384–ADJ
TTL SHUTDOWN CIRCUIT
1
µ
F
0.015
µ
F
4.7
µ
F
470 k
+5 V
LOGIC
INPUT
+5 V
GND
(–)
Figure 8. TTL Controlled Shutdown Circuit for the UCC384