LM285
Micropower Voltage
Reference Diodes
The LM285/LM385 series are micropower two–terminal bandgap voltage
regulator diodes. Designed to operate over a wide current range of 10
µA
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 on–chip 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 TO–226AA 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
µA
to 20 mA
LM385, B
MICROPOWER VOLTAGE
REFERENCE DIODES
SEMICONDUCTOR
TECHNICAL DATA
Z SUFFIX
PLASTIC PACKAGE
CASE 29
(Bottom View)
3
2
1
N.C.
Cathode
Anode
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO–8)
N.C. 1
N.C. 2
N.C. 3
Anode 4
•
•
•
•
1.0%, 1.5%, 2.0% and 3.0% Initial Tolerance Grades
Low Temperature Coefficient
1.0
Ω
Dynamic Impedance
Surface Mount Package Available
8 Cathode
7
N.C.
6 N.C.
5 N.C.
Standard Application
1.5 V
Battery
+
–
3.3 k
1.235 V
LM385–1.2
Representative Schematic Diagram
Cathode
360 k
Open
for 1.235 V
10 k
ORDERING INFORMATION
Reverse
Break–
Operating
Temperature down
Voltage Tolerance
Range
TA = – 40° to
+85°C
1.235 V
2.500 V
1.235 V
1.235 V
2.500 V
2.500 V
±
1.0%
±
1.5%
±
1.0%
±
2.0%
±
1.5%
±
3.0%
600 k
Device
8.45 k
LM285D–1.2
LM285Z–1.2
LM285D–2.5
LM285Z–2.5
600 k
425 k
LM385BD–1.2
LM385BZ–1.2
LM385D–1.2
LM385Z–1.2
74.3 k
Open
for 2.5 V
600 k
500
Ω
100 k
LM385BD–2.5
LM385BZ–2.5
LM385D–2.5
LM385Z–2.5
TA = 0° to
+70°C
Anode
5–4
MOTOROLA ANALOG IC DEVICE DATA
LM285 LM385, B
MAXIMUM RATINGS
(TA = 25°C, unless otherwise noted)
Rating
Reverse Current
Forward Current
Operating Ambient Temperature Range
LM285
LM385
Operating Junction Temperature
Storage Temperature Range
Symbol
IR
IF
TA
– 40 to + 85
0 to +70
TJ
Tstg
+ 150
– 65 to + 150
°C
°C
Value
30
10
Unit
mA
mA
°C
ELECTRICAL CHARACTERISTICS
(TA = 25°C, unless otherwise noted)
LM285–1.2
Characteristic
Reverse Breakdown Voltage (IRmin
LM285–1.2/LM385B–1.2
TA = Tlow to Thigh (Note 1)
LM385–1.2
TA = Tlow to Thigh (Note 1)
Minimum Operating Current
TA = 25°C
TA = Tlow to Thigh (Note 1)
Reverse Breakdown Voltage Change with Current
IRmin
IR
1.0 mA, TA = +25°C
TA = Tlow to Thigh (Note 1)
1.0 mA
IR
20 mA, TA = +25°C
TA = Tlow to Thigh (Note 1)
LM385–1.2/LM385B–1.2
Max
1.247
1.270
–
–
10
20
1.0
1.5
10
20
–
–
–
–
Min
1.223
1.210
1.205
1.192
–
–
–
–
–
–
–
–
–
–
Typ
1.235
–
1.235
–
8.0
–
–
–
–
–
0.6
80
60
20
Max
1.247
1.260
1.260
1.273
µA
–
–
∆V
(BR)R
–
–
–
–
Z
∆V
(BR)/∆T
n
S
–
–
–
–
–
–
–
0.6
80
60
20
1.0
1.5
20
25
–
–
–
–
W
ppm/°C
µV
ppm/
kHR
8.0
–
15
20
mV
Unit
V
1.223
1.200
–
–
IRmin
1.235
–
–
–
Symbol
V(BR)R
Min
Typ
p
IR
p
20 mA)
p p
p p
p p
Reverse Dynamic Impedance
IR = 100
µA,
TA = +25°C
Average Temperature Coefficient
10
µA
IR
20 mA, TA = Tlow to Thigh (Note 1)
Wideband Noise (RMS)
IR = 100
µA,
10 Hz
f
p p
10 kHz
Long Term Stability
IR = 100
µA,
TA = +25°C
±
0.1°C
MOTOROLA ANALOG IC DEVICE DATA
5–5
LM285 LM385, B
ELECTRICAL CHARACTERISTICS
(TA = 25°C, unless otherwise noted)
LM285–2.5
Characteristic
Reverse Breakdown Voltage (IRmin
LM285–2.5/LM385B–2.5
TA = Tlow to Thigh (Note 1)
LM385–2.5
TA = Tlow to Thigh (Note 1)
Minimum Operating Current
TA = 25°C
TA = Tlow to Thigh (Note 1)
Reverse Breakdown Voltage Change with Current
IRmin
IR
1.0 mA, TA = +25°C
TA = Tlow to Thigh (Note 1)
1.0 mA
IR
20 mA, TA = +25°C
TA = Tlow to Thigh (Note 1)
LM385–2.5/LM385B–2.5
Max
2.538
2.585
–
–
20
30
1.0
1.5
10
20
–
–
–
–
Min
2.462
2.436
2.425
2.400
–
–
–
–
–
–
–
–
–
–
Typ
2.5
–
2.5
–
13
–
–
–
–
–
0.6
80
120
20
Max
2.538
2.564
2.575
2.600
µA
–
–
∆V
(BR)R
–
–
–
–
Z
∆V
(BR)/∆T
n
S
–
–
–
–
–
–
–
0.6
80
120
20
2.0
2.5
20
25
–
–
–
–
W
ppm/°C
µV
ppm/
kHR
13
–
20
30
mV
Unit
V
2.462
2.415
–
–
IRmin
2.5
–
–
–
Symbol
V(BR)R
Min
Typ
p
IR
p
20 mA)
p p
p p
p p
Reverse Dynamic Impedance
IR = 100
µA,
TA = +25°C
Average Temperature Coefficient
20
µA
IR
20 mA, TA = Tlow to Thigh (Note 1)
Wideband Noise (RMS)
IR = 100
µA,
10 Hz
f
p p
10 kHz
Long Term Stability
IR = 100
µA,
TA = +25°C
±
0.1°C
NOTES:
1. Tlow = – 40°C for LM285–1.2, LM285–2.5
= 0°C for LM385–1.2, LM385B–1.2, LM385–2.5, LM385B–2.5
Thigh = +85°C for LM285–1.2, LM285–2.5
Thigh
= +70°C for LM385–1.2, LM385B–1.2, LM385–2.5, LM385B–2.5
5–6
MOTOROLA ANALOG IC DEVICE DATA
LM285 LM385, B
TYPICAL PERFORMANCE CURVES FOR LM285–1.2/385–1.2/385B–1.2
Figure 1. Reverse Characteristics
100
IR, REVERSE CURRENT (
µ
A)
∆
V(BR)R, REVERSE VOLTAGE CHANGE (mV)
Figure 2. Reverse Characteristics
10
8.0
6.0
+ 25°C
4.0
– 40°C
2.0
0
–2.0
0.01
0.1
1.0
10
IR, REVERSE CURRENT (mA)
100
TA = + 85°C
10
1.0
TA = + 85°C
+ 25°C
0.1
0
0.2
– 40°C
1.2
1.4
0.4
0.6
0.8
1.0
V(BR), REVERSE VOLTAGE (V)
Figure 3. Forward Characteristics
1.250
V(BR)R, REVERSE VOLTAGE (V)
VF, FORWARD VOLTAGE (V)
1.2
1.0
0.8
0.6
0.4
0.2
0
0.01
0.1
1.0
10
IF , FORWARD CURRENT (mA)
100
+ 25°C
+ 85°C
TA = – 40°C
Figure 4. Temperature Drift
1.240
IR = 100
µA
1.230
1.220
1.210
–50
–25
0
25
50
75
TA , AMBIENT TEMPERATURE (°C)
100
125
Figure 5. Noise Voltage
875
OUTPUT (V)
750
1.50
1.25
1.00
0.75
0.50
0.25
375
INPUT (V)
250
125
0
10
100
1.0 K
f, FREQUENCY (Hz)
10 K
100 k
0
10
5.0
0
0
0.1
Figure 6. Response Time
Input
√
Hz)
100 k
Output
625
500
e n , NOISE (nV/
DUT
0.2
0.3
0.6 0.7
t, TIME (ms)
0.8
0.9
1.0
1.1
MOTOROLA ANALOG IC DEVICE DATA
5–7
LM285 LM385, B
TYPICAL PERFORMANCE CURVES FOR LM285–2.5/385–2.5/385B–2.5
Figure 7. Reverse Characteristics
100
IR, REVERSE CURRENT (
µ
A)
∆
V(BR)R, REVERSE VOLTAGE CHANGE (mV)
Figure 8. Reverse Characteristics
10
8.0
6.0
+ 25°C
4.0
2.0
0
–2.0
0.01
0.1
1.0
10
IR, REVERSE CURRENT (mA)
100
– 40°C
TA = + 85°C
10
TA = + 85°C
+ 25°C
1.0
– 40°C
0.1
0
0.5
1.0
1.5
2.0
2.5
V(BR), REVERSE VOLTAGE (V)
3.0
3.5
Figure 9. Forward Characteristics
2.520
2.510
2.500
2.490
2.480
2.470
2.460
2.450
0.1
1.0
10
IF , FORWARD CURRENT (mA)
100
–50
Figure 10. Temperature Drift
V(BR)R, REVERSE VOLTAGE (V)
VF, FORWARD VOLTAGE (V)
1.2
1.0
TA = – 40°C
0.8
0.6
0.4
0.2
0
0.01
+ 25°C
+ 85°C
IR = 100
µA
–25
0
25
50
75
TA , AMBIENT TEMPERATURE (°C)
100
125
Figure 11. Noise Voltage
3.00
2.50
OUTPUT (V)
1500
Figure 12. Response Time
Input
√
Hz)
2.00
1.50
1.00
0.50
0
DUT
100 k
Output
1250
e n , NOISE (nV/
1000
750
INPUT (V)
10
100
1.0 K
f, FREQUENCY (Hz)
10 K
100 k
500
250
0
10
5.0
0
0
0.1
0.2
0.3
0.6 0.7
t, TIME (ms)
0.8
0.9
1.0
1.1
5–8
MOTOROLA ANALOG IC DEVICE DATA
