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
3
Copyright 1999
Rev. 2.0a 10/00
P
R O D U C T I O N
D
A T A
S
H E E T
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for the LX8385-xxC/85A/85B-xxC with 0°C
≤
T
A
≤
125°C and the LX8385-xxI with -25°C
≤
T
≤
125°C; V
- V
= 3V; I
OUT
= 3A. Low duty cycle pulse testing techniques are used which maintains
junction and case temperatures equal to the ambient temperature.)
LX8385-00/85A/85B-00
(Adjustable)
Parameter
Symbol
Test Conditions
Units
LX8385/85A/85B-00
Min.
Typ.
1.238
1.250
1.225
1.250
1.240
1.250
1.238
1.250
0.015
0.2
0.01
65
83
Max.
1.262
1.270
1.260
1.262
0.2
0.5
0.04
Reference Voltage
(Note 4)
LX8385-00
V
REF
I
OUT
= 10mA, T
A
= 25°C
10mA
≤
I
OUT
≤
I
OUT (MAX)
, 1.5V
≤
(V
IN
- V
OUT
), V
IN
≤
10V, P
≤
P
MAX
I
OUT
= 10mA, T
A
= 25°C
10mA
≤
I
OUT
≤
I
OUT (MAX)
, 1.5V
≤
(V
IN
- V
OUT
), V
IN
≤
10V, P
≤
P
MAX
V
REF
(V
IN
)
1.5V
≤
(V
IN
- V
OUT
)
≤
7V, I
OUT
= 10mA
V
REF
(I
OUT
)
V
IN
- V
OUT
= 3V, 10mA
≤
I
OUT
≤
3A
V
OUT
(Pwr)
T
A
= 25°C, 20ms pulse
V
OUT
= 5V, f =120Hz, C
OUT
= 100μf Tantalum, V
IN
= 6.5V
C
ADJ
= 10μF, I
OUT
= 3A
I
ADJ
I
ADJ
10mA
≤
I
OUT
≤
I
OUT (MAX)
, 1.5V
≤
(V
IN
- V
OUT
), V
IN
≤
10V
V
V
REF
= 1%, I
OUT
= 3A
V
REF
= 1%, I
OUT
= 3A
I
OUT (MIN)
V
IN
≤
10V
I
OUT (MAX)
(V
IN
- V
OUT
)
≤
7V, V
IN
≤
10V
V
OUT
(T)
V
OUT
(t) T
A
= 125°C, 1000 hours
T
A
= 25°C, 10Hz
≤
f
≤
10kHz
LX8385A/85B-00
Line Regulation (Note 2)
Load Regulation (Note 2)
Thermal Regulation
Ripple Rejection (Note 3)
Adjust Pin Current
Adjust Pin Current Change (Note 4)
Dropout Voltage
LX8385-00
LX8385A/85B-00
Minimum Load Current
Maximum Output Current
Temperature Stability (Note 3)
Long Term Stability (Note 3)
RMS Output Noise (% of V
OUT
) (Note 3) V
OUT (RMS)
V
V
V
V
%
%
%/W
dB
55
0.2
1.2
1.1
2
3.5
0.25
0.3
0.003
100
5
1.5
1.3
10
μA
μA
V
V
mA
A
%
%
%
3
1
Parameter
Symbol
Test Conditions
Units
LX8385/85A/85B-33
Min.
Typ.
3.267
3.3
3.235
3.3
3.274
3.3
3.267
3.3
1
2
5
0.01
60
83
4
1.2
1.1
3
3.5
0.25
0.3
0.003
Max.
3.333
3.365
3.326
3.333
6
10
15
0.02
Output Voltage
(Note 4)
LX8385-33
V
OUT
V
IN
= 5V, I
OUT
= 0mA, T
A
= 25°C
4.75V
≤
V
IN
≤
10V, 0mA
≤
I
OUT
≤
3A, P
≤
P
MAX
V
IN
= 5V, I
OUT
= 0mA, T
A
= 25°C
4.75V
≤
V
IN
≤
10V, 0mA
≤
I
OUT
≤
3A, P
≤
P
MAX
4.75V
≤
V
IN
≤
7V
4.75V
≤
V
IN
≤
10V
V
OUT
(I
OUT
)
V
IN
= 5V, 0mA
≤
I
OUT
≤
I
OUT (MAX)
V
OUT
(Pwr)
T
A
= 25°C, 20ms pulse
C
OUT
= 100μF (Tantalum), I
OUT
= 3A
I
Q
0mA
≤
I
OUT
≤
I
OUT (MAX)
, 4.75V
≤
V
IN
≤
10V
V
V
OUT
= 1%, I
OUT
≤
I
OUT (MAX)
V
OUT
= 1%, I
OUT
≤
I
OUT (MAX)
I
OUT (MAX)
V
IN
≤
7V
V
OUT
(T)
V
OUT
(t) T
A
= 125°C, 1000 hours
T
A
= 25°C, 10Hz
≤
f
≤
10kHz
LX8385A/85B-33
Line Regulation (Note 2)
V
OUT
(V
IN
)
Load Regulation (Note 2)
Thermal Regulation
Ripple Rejection (Note 3)
Quiescent Current
Dropout Voltage
LX8385-33
LX8385A/85B-33
Maximum Output Current
Temperature Stability (Note 3)
Long Term Stability (Note 3)
RMS Output Noise (% of V
OUT
) (Note 3) V
OUT (RMS)
V
V
V
V
mV
mV
mV
% / W
dB
mA
V
V
A
%
%
%
10
1.5
1.3
1
Note 2. Regulation is 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. These parameters, although guaranteed, are not tested in production.
Note 4. See Maximum Output Current Section above.
LX8385-33/85A-33/85B-33
(3.3V Fixed)