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Microsemi Corporation
Microsemi Corporation

LM385 Datasheet

1.2 & 2.5V MICROPOWER VOLTAGE REFERENCE


LM385 Datasheet Preview


T H E I N F I N I T E P O W E R O F I N N O VAT I O N
L I N D O C #: 385
LM385/385B
1.2 & 2.5V MICROPOWER VOLTAGE REFERENCE
PR O D U C T I O N D ATA S H E E T
DESCRIPTION
The LM385/385B Micropower Voltage
References are two terminal bandgap
reference diodes designed and optimized
for accurate low power operation in
portable and other power sensitive
systems. Operating currents are
guaranteed from as low as 15µA up to
20mA for the LM385/385B-1.2, and 20µA
up to 20mA for the LM385/385B-2.5,
giving designers a great deal of flexibility
in optimizing power consumption, noise
and ultimate application performance. As
an added feature, the references output
impedance is extraordinarily low over the
entire operating range of quiescent
currents. This enables an extremely wide
dynamic load range with little effect on
the overall reference accuracy.
The LM385 family is available in fixed
1.2V and 2.5V reference values. Process
and circuit design optimization provide
for high accuracy with initial tolerance
values of 1% for the LM385B-1.2, 2% for
the LM385-1.2, 1.5% for the LM385B-2.5,
and 3% for the LM385-2.5.
Complementing their initial accuracy, the
bandgap reference is temperature
compensated to deliver 20ppm
performance over the 0° to 70°C
operating temperature range.
The LM385 family from Linfinity is a
pin-for-pin replacement for the LM385/
385B family of voltage references.
KEY FEATURES
s GUARANTEED 1% INITIAL ACCURACY
(LM385B-1.2)
s GUARANTEED 2.5% INITIAL ACCURACY
(LM385-1.2)
s GUARANTEED 1.5% INITIAL ACCURACY
(LM385B-2.5)
s GUARANTEED 3% INITIAL ACCURACY
(LM385-2.5)
p GUARANTEED 20µA OPERATING CURRENT
p LOW TEMPERATURE COEFFICIENT
p OPERATING CURRENT OF 20µA TO 20mA
p VERY LOW DYNAMIC IMPEDANCE . . . 1
A P P L I C AT I O N S
s PORTABLE METER REFERENCES
p PORTABLE TEST INSTRUMENTS
p BATTERY OPERATED SYSTEMS
p CURRENT LOOP INSTRUMENTATION
1.2V R E F E R E N C E
PRODUCT HIGHLIGHT
MICROPOWER REFERENCE FROM
9V BATTERY
5V 9V
38k
1.2V
LM385-1.2V
200k
2.5V
LM385-2.5V
Copyright © 1996
Rev. 1.2 7/96
TA (°C)
0 to 70
PACKAGE ORDER INFORMATION
Reference
Voltage
Initial
Tolerance
DM
Plastic
8-pin
SOIC
LP
Plastic
3-pin
TO-92
1.2V
±30mV
±12mV
LM385DM-1.2
LM385BDM-1.2
LM385LP-1.2
LM385BLP-1.2
2.5V
±75mV
±38mV
LM385DM-2.5
LM385BDM-2.5
LM385LP-2.5
LM385BLP-2.5
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LM385DM-2.5T)
FOR FURTHER INFORMATION CALL (714) 898-8121
11861 WESTERN A VENUE, G ARDEN G ROVE, CA. 92841
1
Page 1

LM385/385B
PRODUCT DATABOOK 1996/1997
1.2 & 2.5V MICROPOWER VOLTAGE REFERENCE
PRODUCTION DATA SHEET
A B S O L U T E M A X I M U M R AT I N G S (Note 1)
Reverse Breakdown Current .................................................................................... 30mA
Forward Current ........................................................................................................ 10mA
Operating Temperature Range
LM385 ........................................................................................................... 0°C to 70°C
Storage Temperature Range ...................................................................... -65°C to 150°C
Lead Temperature (soldering, 10 seconds) ............................................................. 300°C
Note 1. Values beyond which damage may occur. All voltages are specified with respect to
ground, and all currents are positive into the specified terminal
PACKAGE PIN OUTS
N/C 1.
N/C 2.
N/C 3 .
ANODE 4.
8. CATHODE
7. N/C
6. CATHODE
5. N/C
DM PACKAGE
(Top View)
T H E R MAL DATA
DM PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
LP PACKAGE:
165ºC/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
165ºC/W
The θJA numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow.
1. ANODE
2. CATHODE
3. N/C
LP PACKAGE
(Top View)
2 Copyright © 1996
Rev. 1.2 7/96
Page 2

PRODUCT DATABOOK 1996/1997
1.2 & 2.5V MICROPOWER VOLTAGE REFERENCE
PR O D U C T I O N D ATA S H E E T
LM385/385B
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply to TA = 25ºC. Typ number represents TA = 25ºC value.)
LM385/385B-1.2
Parameter
Symbol
Test Conditions
Reverse Breakdown Voltage
LM385
LM385B
Average Temperature Coefficient
Minimum Operating Current
Reverse Breakdown Voltage Chang
with Current
Reverse Dynamic Impedance
Wide Band Noise (RMS)
Long Term Stability
LM385/385B-2.5
Parameter
VZ
VZ
Temp
IMIN
e
IR
rz
en
VZ
Time
IMIN IR IMAX
IMIN IR IMAX
IR = 100µA
VZ IMIN IR 1mA
1mA IR 20mA
IR = 100µA
IR = 100µA, 10Hz f 10kHz
IR = 100µA, TA = 25°C ± 0.1°C
Symbol
Test Conditions
Reverse Breakdown Voltage
LM385
LM385B
Average Temperature Coefficient
Minimum Operating Current
Reverse Breakdown Voltage Chang
with Current
Reverse Dynamic Impedance
Wide Band Noise (RMS)
Long Term Stability
VZ
VZ
Temp
IMIN
e
IR
rz
en
VZ
Time
IMIN IR IMAX
IMIN IR IMAX
IR = 100µA
VZ IMIN IR 1mA
1mA IR 20mA
IR = 100µA, f = 20Hz
IR = 100µA, 10Hz f 10kHz
IR = 100µA, TA = 25°C ± 0.1°C
LM385/385B-1.2
Min. Typ. Max.
1.205 1.235 1.260
1.223 1.235 1.247
20
Units
V
V
ppm/°C
8 15 µA
1.5 mV
20 mV
1
60 µV
20 ppm/kHr
LM385/385B-2.5
Units
Min. Typ. Max.
2.425 2.500 2.575
2.462 2.500 2.538
V
V
20 ppm/°C
13 20 µA
2 mV
20 mV
1
120 µV
20 ppm/kHr
Characteristic Curves
LM385/385B-1.2
FIGURE #
1. RESPONSE TIME
2. REVERSE CHARACTERISTICS
3. FORWARD CHARACTERISTICS
4. TEMPERATURE DRIFT
5. REVERSE VOLTAGE CHANGE
6. REVERSE DYNAMIC IMPEDANCE
7. NOISE VOLTAGE
GRAPH / CURVE INDEX
Characteristic Curves
LM385/385B-2.5
FIGURE #
8. RESPONSE TIME
9. REVERSE CHARACTERISTICS
10. FORWARD CHARACTERISTICS
11. TEMPERATURE DRIFT
12. REVERSE DYNAMIC IMPEDANCE
13. NOISE VOLTAGE
Copyright © 1996
Rev. 1.2 7/96
3
Page 3

LM385/385B
PRODUCT DATABOOK 1996/1997
1.2 & 2.5V MICROPOWER VOLTAGE REFERENCE
PRODUCTION DATA SHEET
C H A R A C T E R I S T I C C U R V E S — LM385/385B-1.2V
FIGURE 1. — RESPONSE TIME
1.5V
1.0V
0.5V
0
36k
VIN
VOUT
FIGURE 2. — REVERSE CHARACTERISTICS
100
TA = 0 to 70°C
10
5V
0
0 50 100
Time - (µs)
500 550
1
0.1
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4
Reverse Voltage - (V)
FIGURE 3. — FORWARD CHARACTERISTICS
FIGURE 4. — TEMPERATURE DRIFT
1.2
TA = 25°C
1.242
1.24
IR = 100µA
1.238
0.8
1.236
1.234
1.232
0.4
1.23
1.228
0
0.01
0.1 1 10
Forward Current - (mA)
100
1.226
0
10 20 30 40 50
Temperature - (°C)
60 70
4 Copyright © 1996
Rev. 1.2 7/96
Page 4
Part Number LM385
Manufactur Microsemi Corporation
Description 1.2 & 2.5V MICROPOWER VOLTAGE REFERENCE
Total Page 7 Pages
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