LM385B-1.2V Datasheet PDF - TelCom Semiconductor Inc


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LM385B-1.2V
TelCom Semiconductor Inc

Part Number LM385B-1.2V
Description BANDGAP VOLTAGE REFERENCES
Page 4 Pages

LM385B-1.2V datasheet pdf
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1LM285/285B-1.2V
LM285/285B-2.5V
LM385/385B-1.2V
LM385/385B-2.5V
LOW POWER, BANDGAP VOLTAGE REFERENCES
FEATURES
s Output Tolerance ....................................... 1% or 2%
s Output Voltage Option
LM285/385-1.2V ........................................ 1.235V
LM285/385-2.5V ............................................ 2.5V
s Wide Operating Current Range
LM285/385-1.2V ........................... 15µA to 20mA
LM285/385-2.5V ........................... 20µA to 20mA
s Temperature Coefficient .......................... 30ppm/°C
s Dynamic Impedance .......................................... 0.6
s TO-92-3 Plastic Package
s 8-Pin Plastic Narrow Body (SOIC) Package
GENERAL DESCRIPTION
The LM285/385-1.2V (1.235V output) and LM285/385-
2.5V (2.5V output) are bipolar, two-terminal, bandgap volt-
age references that offer precision performance without
premium price. These devices do not require thin-film re-
sistors, greatly lowering manufacturing complexity and cost.
A 30ppm/°C output temperature coefficient and a 15µA
to 20mA operating current range make these voltage refer-
ences especially attractive for multimeter, data acquisition
and telecommunications applications.
PIN CONFIGURATIONS
2
3
APPLICATIONS
s ADC and DAC Reference
s Current Source Generation
s Threshold Detectors
s Power Supplies
s Multi-meters
ORDERING INFORMATION
Part No.
LM285BEOA-1.2
LM285BEOA-2.5
LM285BEZB-1.2
LM285BEZB-2.5
LM285EOA-1.2
LM285EOA-2.5
LM285EZB-1.2
LM285EZB-2.5
LM385BCOA-1.2
LM385BCOA-2.5
LM385BCZB-1.2
LM385BCZB-2.5
LM385COA-1.2
LM385COA-2.5
LM385CZB-1.2
LM385CZB-2.5
Package
8-Pin SOIC
8-Pin SOIC
TO-92-3
TO-92-3
8-Pin SOIC
8-Pin SOIC
TO-92-3
TO-92-3
8-Pin SOIC
8-Pin SOIC
TO-92-3
TO-92-3
8-Pin SOIC
8-Pin SOIC
TO-92-3
TO-92-3
TELCOM SEMICONDUCTOR, INC.
TO-92-3 PLASTIC
(BOTTOM VIEW)
32
1
SURFACE MOUNT
8-PIN PLASTIC SOIC
NC 1
NC 2
NC 3
ANODE 4
8 CATHODE
7 NC
6 NC
5 NC
4
LM285/285B EZB-1.2
LM285/285B EZB-2.5
LM385/385B CZB-1.2
LM385/385B CZB-2.5
LM285/285B E0A-1.2
LM285/285B EOA-2.5
LM385/385B COA-1.2
LM385/385B COA-2.5
NC = NO INTERNAL CONNECTION
5
Temperature
Range
– 40°C to +85°C
– 40°C to +85°C
– 40°C to +85°C
– 40°C to +85°C
– 40°C to +85°C
– 40°C to +85°C
– 40°C to +85°C
– 40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
Voltage
1.2
2.5
1.2
2.5
1.2
2.5
1.2
2.5
1.2
2.5
1.2
2.5
1.2
2.5
1.2
2.5
Tolerance
1%
1.5%
1%
1.5%
2%
3%
2%
3%
1%
1.5%
1%
1.5%
2%
3%
2%
3%
LM285/B/385/B-9 11/6/96
3-9
6
7
8



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LM285/285B-1.2V
LM285/285B-2.5V
LM385/385B-1.2V
LM385/385B-2.5V
LOW POWER, BANDGAP
VOLTAGE REFERENCES
ABSOLUTE MAXIMUM RATINGS*
Forward Current .................................................... +10mA
Reverse Current .................................................... +30mA
Storage Temperature Range ................ – 65°C to +150°C
Operating Temperature Range
TO-92 Package ................................ – 40°C to +85°C
Surface Mount Package ................... – 40°C to +85°C
Lead Temperature (Soldering, 10 sec)
TO-92 Package .............................................. +300°C
Surface Mount Package ................................. +300°C
Power Dissipation
Limited by Forward/Reverse Current
*Functional operation above the absolute maximum stress ratings is not
implied.
ELECTRICAL CHARACTERISTICS: TA = +25°C, unless otherwise specified.
Symbol Parameter
LM285 / LM285B–1.2 LM385 / LM385B–1.2
Test Conditions Min Typ Max Min Typ Max Unit
V(BR)R
IRMIN
V(BR)R
Z
V(BR)/T
S
Reverse Breakdown Voltage
LM285B-1.2/LM385B-1.2
TA = Tlow to Thigh (Note 1)
LM285-1.2V/LM385-1.2V
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 = 1.0mA, TA = +25°C
TA = Tlow to Thigh (Note 1)
1.0mA = IR = 20mA, TA = +25°C
TA = Tlow to Thigh (Note 1)
Reverse Dynamic Impedance
Average Temperature Coefficient
Long Term Stability
IR 20mA
IR = 100µA
10µA IR 20mA
IR = 100µA,
TA = +25°C ±0.1°C
Symbol Parameter
Test Conditions
1.223
1.200
1.205
1.192
1.235
1.235
1.247
1.270
1.260
1.273
— 8.0 15
— — 20
— — 1.0
— — 1.5
— — 10
— — 20
— 0.6 —
— 30 100
— 20 —
LM285 / LM285B–2.5
Min Typ Max
1.223
1.210
1.205
1.192
1.235
1.235
1.247
1.260
1.260
1.273
— 8.0 15
— — 20
V
µA
mV
— — 1.0
— — 1.5
— — 20
— — 25
— 0.6 —
— 30 100 ppm/°C
— 20 — ppm/kHR
LM385 / LM385B–2.5
Min Typ Max Unit
V(BR)R
Reverse Breakdown Voltage
LM285B-2.5/LM385B-2.5
IR = 20mA
2.462
TA = Tlow to Thigh (Note 1)
LM285-2.5V/LM385-2.5V
2.415
2.425
TA = Tlow to Thigh (Note 1)
2.400
IRMIN
Minimum Operating Current
TA = +25°C
TA = Tlow to Thigh (Note 1)
V(BR)R
Reverse Breakdown Voltage
Change with Current
IRmin = IR = 1.0mA, TA = +25°C
TA = Tlow to Thigh (Note 1)
1.0mA = IR = 20mA, TA = +25°C
TA = Tlow to Thigh (Note 1)
Z
Reverse Dynamic Impedance
IR = 100µA
V(BR)/T Average Temperature Coefficient 20µA IR 20mA
S Long Term Stability
IR = 100µA,
TA = +25°C ±0.1°C
Note: 1. Tlow = – 40°C for LM285-1.2, LM285-2.5, LM285B-1.2, LM285B-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, LM285B-1.2, LM285B-2.5
3-10
+70°C for LM385-1.2, LM385B-1.2, LM385-2.5, LM385B-2.5
2.5 2.538 2.462
— 2.585 2.436
2.5 2.575 2.425
— 2.600 2.400
13 20
— 30
— 1.0
— 1.5
— 10
— 20
0.6 —
30 100
20 —
2.5 2.538
— 2.564
2.5 2.575
— 2.600
13 20
— 30
V
µA
mV
— 2.0
— 2.5
— 20
— 25
0.6 —
30 100 ppm/°C
20 — ppm/kHR
TELCOM SEMICONDUCTOR, INC.



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LOW POWER, BANDGAP
VOLTAGE REFERENCES
TYPICAL APPLICATIONS
10V Reference
LM285/385
-2.5V
50 k
+15V
3+ 7
2.5V
2
TC911
–4
6
180 k
60 k
0.1 µF
1LM285/285B-1.2V
LM285/285B-2.5V
LM385/385B-1.2V
LM385/385B-2.5V
Battery Powered 1.25V Reference
Precision Current Source
2
+9V
VOUT = 10V 360 k
1.25V
LM285/385-1.2V
LM285/385-1.2V
81 k
+15V
2– 7
3
TC911
+4
1 µF
6
R SET
3
I OUT
=
1.25V
R SET
4
RESPONSE TIME TEST CIRCUIT
36 k
INPUT
OUTPUT
LM285/385-1.2V
LM285/385-2.5V
5
6
7
TELCOM SEMICONDUCTOR, INC.
8
3-11



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PRELIMINARY INFORMATION
LM285/285B-1.2V
LM285/285B-2.5V
LM385/385B-1.2V
LM385/385B-2.5V
LOW POWER, BANDGAP
VOLTAGE REFERENCES
TYPICAL CHARACTERISTICS
LM285/385-1.2V: Output Voltage vs
Reverse Current
1000
TA = +25°C
100
10
1
LM285/385-1.2V: Output Voltage Change
vs Reverse Current
10
TA = +25°C
8
LM285/385-1.2V: Forward Voltage vs
Forward Current
1.2
TA = +25°C
1.0
0.8
6
0.6
4
0.4
2 0.2
0.1
0
0.25 0.5 0.75 1.0 1.25 1.5
OUTPUT VOLTAGE (V)
0
0.01 0.1 1 10
REVERSE CURRENT (mA)
0
100 0.01
0.1
1
10 100
FORWARD CURRENT (mA)
LM285/385-1.2V
Response Time
10.0
TA = +25°C
5.0
INPUT
0
1.5
1.0 OUTPUT
0.5
0
0 200 400 600
TIME (µsec)
LM285/385-2.5V: Output Voltage vs
Reverse Current
1000
TA = +25°C
100
10
1
LM285/385-2.5V: Output Voltage Change
vs Reverse Current
10
TA = +25°C
8
6
4
2
0.1
0
0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT VOLTAGE (V)
0
0.01
0.1 1 10
REVERSE CURRENT (mA)
100
LM285/385-2.5V: Forward Voltage vs
Forward Current
1.2
TA = +25°C
1.0
0.8
0.6
0.4
LM285/385-2.5V
10 Response Time
5 TA = +25°C
INPUT
0
3
2 OUTPUT
0.2 1
0
0.01
0.1
1
10
FORWARD CURRENT (mA)
100
3-12
0
0 200 400
TIME (µsec)
600
TELCOM SEMICONDUCTOR, INC.




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