
3A L
O W
 D
 R O P O U T
 P
 O S I T I V E
 R
 E G U L AT O R S
LX8385-xx/8385A-xx/8385B-xx
P R O D U C T  D A T A B O O K  1 9 9 6 / 1 9 9 7
Copyright  1999
Rev. 2.0a  10/00
8
P
 R O D U C T I O N
  D
 A T A
  S
 H E E T
TYPICAL APPLICATIONS
LX8385/85A/85B
IN
ADJ
OUT
150μF
V
IN
R2
365
1%
10μF
R1
121
1%
C1
10μF*
* C1 improves ripple rejection.
 X
 should be 
≈
 R1 at ripple
 frequency.
V
OUT
5V
(Note A)
FIGURE 5 
 —  1.2V - 8V Adjustable Regulator
FIGURE 4 
 —  Improving Ripple Rejection
LX8385/85A/85B
IN
ADJ
OUT
V
OUT
**
V
IN
R1
121
R2
1k
C1*
10μF
* Needed if device is far from filter capacitors.
R2
R1
** V
OUT
 = 1.25V   1 + 
C2
100μF
(Note A)
FIGURE 6 
 —  5V Regulator With Shutdown
(Note A)
LX8385/85A/85B
IN
ADJ
OUT
5V
V
121
1%
10μF
100μF
365
1%
1k
1k
2N3904
TTL
Output
Note A:   V
IN (MIN)
 = (Intended V
OUT
) + (V
DROPOUT (MAX)
)
FIGURE 7 
 —  Fixed 3.3V Output Regulator
LX8385/85A/85B-33
IN
GND
OUT
3.3V
V
IN
10μF Tantalum
or 100μF Aluminum
Min. 15μF Tantalum or 
100μF Aluminum capacitor.
May be increased without
limit.  ESR must be less
than 50m
.
PRODUCTION DATA - Information contained in this document is proprietary to Linfinity, and is current as of publication date.  This document