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
•1.0%, 1.5%, 2.0% and 3.0% Initial Tolerance Grades
•Low Temperature Coefficient
•1.0 Ω Dynamic Impedance
•Surface Mount Package Available
Order this document by LM285/D
LM285
LM385, B
MICROPOWER VOLTAGE REFERENCE DIODES
SEMICONDUCTOR
TECHNICAL DATA
Z SUFFIX
PLASTIC PACKAGE
CASE 29
(Bottom View) |
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3 |
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1 |
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N.C. |
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Cathode |
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Anode |
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D SUFFIX |
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PLASTIC PACKAGE |
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CASE 751 |
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(SO±8) N.C. |
1 |
8 |
Cathode |
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N.C. |
2 |
7 |
N.C. |
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N.C. |
3 |
6 |
N.C. |
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Anode |
4 |
5 |
N.C. |
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Representative Schematic Diagram |
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Cathode |
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360 k |
10 k |
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Open |
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for 1.235 V |
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600 k |
8.45 k |
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74.3 k |
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Open |
600 k |
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425 k |
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for 2.5 V |
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600 k |
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500 Ω |
100 k |
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Anode |
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Standard Application |
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1.5 V |
+ |
3.3 k |
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Battery |
± |
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1.235 V |
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LM385±1.2 |
ORDERING INFORMATION
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Reverse |
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Operating |
Break± |
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Temperature |
down |
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Device |
Range |
Voltage |
Tolerance |
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LM285D±1.2 |
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1.235 V |
± 1.0% |
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LM285Z±1.2 |
TA = ± 40° to |
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LM285D±2.5 |
+85°C |
2.500 V |
± 1.5% |
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LM285Z±2.5 |
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LM385BD±1.2 |
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1.235 V |
± 1.0% |
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LM385BZ±1.2 |
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LM385D±1.2 |
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1.235 V |
± 2.0% |
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LM385Z±1.2 |
TA = 0° to |
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LM385BD±2.5 |
+70°C |
2.500 V |
± 1.5% |
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LM385BZ±2.5 |
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LM385D±2.5 |
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2.500 V |
± 3.0% |
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LM385Z±2.5 |
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Motorola, Inc. 1996 |
Rev 2 |
LM285 LM385, B
MAXIMUM RATINGS (TA = 25°C, unless otherwise noted)
Rating |
Symbol |
Value |
Unit |
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Reverse Current |
IR |
30 |
mA |
Forward Current |
IF |
10 |
mA |
Operating Ambient Temperature Range |
TA |
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°C |
LM285 |
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± 40 to + 85 |
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LM385 |
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0 to +70 |
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Operating Junction Temperature |
TJ |
+ 150 |
°C |
Storage Temperature Range |
Tstg |
± 65 to + 150 |
°C |
ELECTRICAL CHARACTERISTICS (TA = 25°C, unless otherwise noted)
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LM285±1.2 |
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LM385±1.2/LM385B±1.2 |
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Characteristic |
Symbol |
Min |
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Typ |
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Max |
Min |
Typ |
Max |
Unit |
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Reverse Breakdown Voltage (IRmin p IR p 20 mA) |
V(BR)R |
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V |
LM285±1.2/LM385B±1.2 |
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1.223 |
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1.235 |
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1.247 |
1.223 |
1.235 |
1.247 |
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TA = Tlow to Thigh (Note 1) |
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1.200 |
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± |
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1.270 |
1.210 |
± |
1.260 |
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LM385±1.2 |
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± |
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± |
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± |
1.205 |
1.235 |
1.260 |
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TA = Tlow to Thigh (Note 1) |
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± |
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± |
1.192 |
± |
1.273 |
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Minimum Operating Current |
IRmin |
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μA |
TA = 25°C |
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± |
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8.0 |
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10 |
± |
8.0 |
15 |
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TA = Tlow to Thigh (Note 1) |
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± |
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20 |
± |
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20 |
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Reverse Breakdown Voltage Change with Current |
V(BR)R |
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mV |
IRmin p IR p 1.0 mA, TA = +25°C |
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± |
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± |
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1.0 |
± |
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1.0 |
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TA = Tlow to Thigh (Note 1) |
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± |
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1.5 |
± |
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1.5 |
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1.0 mA p IR p 20 mA, TA = +25°C |
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± |
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± |
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10 |
± |
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20 |
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TA = Tlow to Thigh (Note 1) |
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± |
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20 |
± |
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25 |
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Reverse Dynamic Impedance |
Z |
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0.6 |
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± |
± |
0.6 |
± |
W |
IR = 100 μA, TA = +25°C |
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Average Temperature Coefficient |
V(BR)/ T |
± |
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80 |
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± |
± |
80 |
± |
ppm/°C |
10 μA p IR p 20 mA, TA = Tlow to Thigh (Note 1) |
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Wideband Noise (RMS) |
n |
± |
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60 |
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± |
± |
60 |
± |
μV |
IR = 100 μA, 10 Hz p f p 10 kHz |
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Long Term Stability |
S |
± |
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20 |
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± |
± |
20 |
± |
ppm/ |
IR = 100 μA, TA = +25°C ± 0.1°C |
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kHR |
2 |
MOTOROLA ANALOG IC DEVICE DATA |
LM285 LM385, B
ELECTRICAL CHARACTERISTICS (TA = 25°C, unless otherwise noted)
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LM285±2.5 |
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LM385±2.5/LM385B±2.5 |
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Characteristic |
Symbol |
Min |
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Typ |
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Max |
Min |
Typ |
Max |
Unit |
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Reverse Breakdown Voltage (IRmin p IR p 20 mA) |
V(BR)R |
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V |
LM285±2.5/LM385B±2.5 |
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2.462 |
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2.5 |
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2.538 |
2.462 |
2.5 |
2.538 |
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TA = Tlow to Thigh (Note 1) |
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2.415 |
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± |
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2.585 |
2.436 |
± |
2.564 |
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LM385±2.5 |
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± |
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± |
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± |
2.425 |
2.5 |
2.575 |
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TA = Tlow to Thigh (Note 1) |
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± |
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± |
2.400 |
± |
2.600 |
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Minimum Operating Current |
IRmin |
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μA |
TA = 25°C |
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± |
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13 |
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20 |
± |
13 |
20 |
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TA = Tlow to Thigh (Note 1) |
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± |
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± |
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30 |
± |
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30 |
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Reverse Breakdown Voltage Change with Current |
V(BR)R |
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mV |
IRmin p IR p 1.0 mA, TA = +25°C |
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± |
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± |
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1.0 |
± |
± |
2.0 |
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TA = Tlow to Thigh (Note 1) |
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± |
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± |
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1.5 |
± |
± |
2.5 |
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1.0 mA p IR p 20 mA, TA = +25°C |
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± |
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± |
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10 |
± |
± |
20 |
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TA = Tlow to Thigh (Note 1) |
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± |
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20 |
± |
± |
25 |
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Reverse Dynamic Impedance |
Z |
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0.6 |
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± |
± |
0.6 |
± |
W |
IR = 100 μA, TA = +25°C |
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Average Temperature Coefficient |
V(BR)/ T |
± |
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80 |
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± |
± |
80 |
± |
ppm/°C |
20 μA p IR p 20 mA, TA = Tlow to Thigh (Note 1) |
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Wideband Noise (RMS) |
n |
± |
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120 |
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± |
± |
120 |
± |
μV |
IR = 100 μA, 10 Hz p f p 10 kHz |
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Long Term Stability |
S |
± |
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20 |
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± |
± |
20 |
± |
ppm/ |
IR = 100 μA, TA = +25°C ± 0.1°C |
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kHR |
NOTES: 1. Tlow = ± 40°C for LM285±1.2, LM285±2.5 |
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Thigh = +85°C for LM285±1.2, LM285±2.5 |
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= 0°C for LM385±1.2, LM385B±1.2, LM385±2.5, LM385B±2.5 |
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= +70°C for LM385±1.2, LM385B±1.2, LM385±2.5, LM385B±2.5 |
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MOTOROLA ANALOG IC DEVICE DATA |
3 |
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