LM285
LM385, B
SEMICONDUCTOR
TECHNICAL DATA
MICROPOWER VOLTAGE
REFERENCE DIODES
ORDERING INFORMATION
Order this document by LM285/D
Z SUFFIX
PLASTIC PACKAGE
CASE 29
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO8)
(Bottom View)
1
3
2
8
7
6
5
Cathode
N.C.
N.C.
N.C.
4
3
2
Anode
N.C.
N.C.
1
N.C.
N.C.
Cathode
Anode
+
LM3851.2
1.235 V
3.3 k
1.5 V
Battery
Standard Application
Device
Operating
Temperature
Range
Tolerance
LM285D1.2
LM285Z1.2
TA = 40
to
+85
C
1.0%
LM285D2.5
LM285Z2.5
LM385BD1.2
LM385BZ1.2
LM385D1.2
LM385Z1.2
LM385BD2.5
LM385BZ2.5
LM385D2.5
LM385Z2.5
Reverse
Break
down
Voltage
1.235 V
1.5%
2.500 V
TA = 0
to
+70
C
1.0%
1.235 V
2.0%
1.235 V
1.5%
2.500 V
3.0%
2.500 V
1
MOTOROLA ANALOG IC DEVICE DATA
Micropower Voltage
Reference Diodes
The LM285/LM385 series are micropower twoterminal bandgap voltage
regulator diodes. Designed to operate over a wide current range of 10
A to
20 mA, these devices feature exceptionally low dynamic impedance, low
noise and stable operation over time and temperature. Tight voltage
tolerances are achieved by onchip trimming. The large dynamic operating
range enables these devices to be used in applications with widely varying
supplies with excellent regulation. Extremely low operating current make
these devices ideal for micropower circuitry like portable instrumentation,
regulators and other analog circuitry where extended battery life is required.
The LM285/LM385 series are packaged in a low cost TO226AA plastic
case and are available in two voltage versions of 1.235 and 2.500 V as
denoted by the device suffix (see Ordering Information table). The LM285 is
specified over a 40
C to +85
C temperature range while the LM385 is rated
from 0
C to +70
C.
The LM385 is also available in a surface mount plastic package in
voltages of 1.235 and 2.500 V.
Operating Current from 10
A to 20 mA
1.0%, 1.5%, 2.0% and 3.0% Initial Tolerance Grades
Low Temperature Coefficient
1.0
Dynamic Impedance
Surface Mount Package Available
Representative Schematic Diagram
Open
for 1.235 V
10 k
Cathode
Anode
100 k
500
600 k
600 k
425 k
74.3 k
8.45 k
600 k
360 k
Open
for 2.5 V
Motorola, Inc. 1996
Rev 2
LM285 LM385, B
2
MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS
(TA = 25
C, unless otherwise noted)
Rating
Symbol
Value
Unit
Reverse Current
IR
30
mA
Forward Current
IF
10
mA
Operating Ambient Temperature Range
TA
C
LM285
LM385
40 to + 85
0 to +70
Operating Junction Temperature
TJ
+ 150
C
Storage Temperature Range
Tstg
65 to + 150
C
ELECTRICAL CHARACTERISTICS
(TA = 25
C, unless otherwise noted)
LM2851.2
LM3851.2/LM385B1.2
Characteristic
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
Reverse Breakdown Voltage (IRmin
p
IR
p
20 mA)
V(BR)R
V
LM2851.2/LM385B1.2
1.223
1.235
1.247
1.223
1.235
1.247
TA = Tlow to Thigh (Note 1)
1.200
1.270
1.210
1.260
LM3851.2
1.205
1.235
1.260
TA = Tlow to Thigh (Note 1)
1.192
1.273
Minimum Operating Current
IRmin
A
TA = 25
C
8.0
10
8.0
15
TA = Tlow to Thigh (Note 1)
20
20
Reverse Breakdown Voltage Change with Current
V(BR)R
mV
IRmin
p
IR
p
1.0 mA, TA = +25
C
1.0
1.0
TA = Tlow to Thigh (Note 1)
1.5
1.5
1.0 mA
p
IR
p
20 mA, TA = +25
C
10
20
TA = Tlow to Thigh (Note 1)
20
25
Reverse Dynamic Impedance
Z
0.6
0.6
W
IR = 100
A, TA = +25
C
Average Temperature Coefficient
V(BR)/
T
80
80
ppm/
C
10
A
p
IR
p
20 mA, TA = Tlow to Thigh (Note 1)
Wideband Noise (RMS)
n
60
60
V
IR = 100
A, 10 Hz
p
f
p
10 kHz
Long Term Stability
S
20
20
ppm/
IR = 100
A, TA = +25
C
0.1
C
kHR
LM285 LM385, B
3
MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS
(TA = 25
C, unless otherwise noted)
LM2852.5
LM3852.5/LM385B2.5
Characteristic
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
Reverse Breakdown Voltage (IRmin
p
IR
p
20 mA)
V(BR)R
V
LM2852.5/LM385B2.5
2.462
2.5
2.538
2.462
2.5
2.538
TA = Tlow to Thigh (Note 1)
2.415
2.585
2.436
2.564
LM3852.5
2.425
2.5
2.575
TA = Tlow to Thigh (Note 1)
2.400
2.600
Minimum Operating Current
IRmin
A
TA = 25
C
13
20
13
20
TA = Tlow to Thigh (Note 1)
30
30
Reverse Breakdown Voltage Change with Current
V(BR)R
mV
IRmin
p
IR
p
1.0 mA, TA = +25
C
1.0
2.0
TA = Tlow to Thigh (Note 1)
1.5
2.5
1.0 mA
p
IR
p
20 mA, TA = +25
C
10
20
TA = Tlow to Thigh (Note 1)
20
25
Reverse Dynamic Impedance
Z
0.6
0.6
W
IR = 100
A, TA = +25
C
Average Temperature Coefficient
V(BR)/
T
80
80
ppm/
C
20
A
p
IR
p
20 mA, TA = Tlow to Thigh (Note 1)
Wideband Noise (RMS)
n
120
120
V
IR = 100
A, 10 Hz
p
f
p
10 kHz
Long Term Stability
S
20
20
ppm/
IR = 100
A, TA = +25
C
0.1
C
kHR
NOTES: 1. Tlow = 40
C for LM2851.2, LM2852.5
Thigh = +85
C for LM2851.2, LM2852.5
= 0
C for LM3851.2, LM385B1.2, LM3852.5, LM385B2.5
Thigh
= +70
C for LM3851.2, LM385B1.2, LM3852.5, LM385B2.5
LM285 LM385, B
4
MOTOROLA ANALOG IC DEVICE DATA
1.1
t, TIME (ms)
0
1.0
0.9
0.8
0.7
0.6
0.3
0.2
0.1
1.25
1.50
0.75
0.50
0
5.0
0.25
10
0
1.00
OUTPUT
(V)
INPUT
(V)
Input
DUT
Output
100 k
100
875
1.0 K
100 k
10 K
10
0
125
250
375
750
625
500
f, FREQUENCY (Hz)
e
n
, NOISE (nV/
Hz)
125
TA , AMBIENT TEMPERATURE (
C)
1.210
1.220
1.230
1.240
1.250
100
75
50
0
25
25
50
V
(BR)R
, REVERSE VOL
T
AGE (V)
10
0.01
100
1.0
0.1
1.2
1.0
0.8
0.6
0.4
0.2
0
IF , FORWARD CURRENT (mA)
V
F, FOR
W
ARD
VOL
T
AGE
(V)
TYPICAL PERFORMANCE CURVES FOR LM2851.2/3851.2/385B1.2
0.2
0.4
0.6
0.8
1.0
1.2
10
1.4
100
1.0
0.1
0
V(BR), REVERSE VOLTAGE (V)
Figure 1. Reverse Characteristics
, REVERSE CURRENT
(
A
)
I R
Figure 2. Reverse Characteristics
0.1
1.0
10
100
0.01
8.0
6.0
4.0
2.0
0
2.0
10
IR, REVERSE CURRENT (mA)
V
(BR)R
, REVERSE VOL
T
AGE
CHANGE
(mV)
TA = + 85
C
+ 25
C
40
C
TA = + 85
C
+ 25
C
40
C
Figure 3. Forward Characteristics
TA = 40
C
+ 25
C
+ 85
C
Figure 4. Temperature Drift
IR = 100
A
Figure 5. Noise Voltage
Figure 6. Response Time
LM285 LM385, B
5
MOTOROLA ANALOG IC DEVICE DATA
V(BR), REVERSE VOLTAGE (V)
1.1
t, TIME (ms)
0
1.0
0.9
0.8
0.7
0.6
0.3
0.2
0.1
2.50
3.00
1.50
1.00
0
5.0
0.50
10
0
2.00
OUTPUT
(V)
INPUT
(V)
Input
DUT
Output
100 k
100
1.0 K
100 k
10 K
10
0
250
500
750
1500
1250
1000
f, FREQUENCY (Hz)
e
n
, NOISE (nV/
Hz)
125
TA , AMBIENT TEMPERATURE (
C)
2.450
2.470
2.490
2.510
2.520
100
75
50
0
25
25
50
V
(BR)R
, REVERSE VOL
T
AGE (V)
10
0.01
100
1.0
0.1
1.2
1.0
0.8
0.6
0.4
0.2
0
IF , FORWARD CURRENT (mA)
V
F, FOR
W
ARD
VOL
T
AGE
(V)
TYPICAL PERFORMANCE CURVES FOR LM2852.5/3852.5/385B2.5
0.5
1.0
1.5
2.0
2.5
3.0
10
3.5
100
1.0
0.1
0
Figure 7. Reverse Characteristics
, REVERSE CURRENT
(
A
)
I R
Figure 8. Reverse Characteristics
0.1
1.0
10
100
0.01
8.0
6.0
4.0
2.0
0
2.0
10
IR, REVERSE CURRENT (mA)
V
(BR)R
, REVERSE VOL
T
AGE
CHANGE
(mV)
TA = + 85
C
+ 25
C
40
C
TA = + 85
C
+ 25
C
40
C
Figure 9. Forward Characteristics
TA = 40
C
+ 25
C
+ 85
C
Figure 10. Temperature Drift
IR = 100
A
Figure 11. Noise Voltage
Figure 12. Response Time
2.460
2.480
2.500
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