LIN D
O C
#:
385
LM385/385B
1.2 & 2.5V M
I C R O P O W E R
V
O LTA G E
R
E F E R E N C E
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
P
R O D U C T I O N
D
A T A
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.
K E Y F E AT U R E S
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 . . . 1Ω
A P P L I C AT I O N S
s
p
p
p
PORTABLE METER REFERENCES
PORTABLE TEST INSTRUMENTS
BATTERY OPERATED SYSTEMS
CURRENT LOOP INSTRUMENTATION
PRODUCT HIGHLIGHT
1.2V R
E F E R E N C E
5V
M
ICROPOWER
R
EFERENCE
F
ROM
9V B
ATTERY
9V
38k
1.2V
LM385-1.2V
200k
2.5V
LM385-2.5V
PA C K A G E O R D E R I N F O R M AT I O N
T
A
(°C)
Reference
Voltage
1.2V
Initial
Tolerance
±30mV
±12mV
±75mV
±38mV
DM
Plastic SOIC
8-pin
LM385DM-1.2
LM385BDM-1.2
LM385DM-2.5
LM385BDM-2.5
LP
Plastic TO-92
3-pin
LM385LP-1.2
LM385BLP-1.2
LM385LP-2.5
LM385BLP-2.5
0 to 70
2.5V
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LM385DM-2.5T)
F O R F U R T H E R I N F O R M AT I O N C A L L ( 7 1 4 ) 8 9 8 - 8 1 2 1
Copyright © 1996
Rev. 1.2 7/96
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841
1
PRODUCT DATABOOK 1996/1997
LM385/385B
1.2 & 2.5V M
I C R O P O W E R
V
O LTA G E
R
E F E R E N C E
P
R O D U C T I O N
D
A T A
S
H E E T
A B S O L U T E M A X I M U M R AT I N G S
(Note 1)
PACKAGE PIN OUTS
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
N/C
1.
N/C
2.
N/C
3 .
ANODE
4.
8.
7.
6.
5.
CATHODE
N/C
CATHODE
N/C
DM PACKAGE
(Top View)
T H ER MAL DATA
DM PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
LP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT,
θ
JA
165ºC/W
165ºC/W
1.
ANODE
2.
CATHODE
3.
N/C
LP PACKAGE
(Top View)
The
θ
JA
numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow.
2
Copyright © 1996
Rev. 1.2 7/96
PRODUCT DATABOOK 1996/1997
LM385/385B
1.2 & 2.5V M
I C R O P O W E R
V
O LTA G E
R
E F E R E N C E
P
R O D U C T I O N
D
A T A
S
H E E T
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply to T
A
= 25ºC. Typ number represents T
A
= 25ºC value.)
LM385/385B-1.2
Parameter
Reverse Breakdown Voltage
Average Temperature Coefficient
Minimum Operating Current
Reverse Breakdown Voltage Chang
with Current
Reverse Dynamic Impedance
Wide Band Noise (RMS)
Long Term Stability
LM385
LM385B
Symbol
V
Z
∆V
Z
∆Temp
I
MIN
e
∆I
R
r
z
e
n
∆V
Z
∆Time
I
MIN
≤
I
R
≤
I
MAX
I
MIN
≤
I
R
≤
I
MAX
I
R
= 100µA
Test Conditions
LM385/385B-1.2
Min. Typ.
Max.
1.205
1.223
1.235
1.235
20
8
1.260
1.247
Units
V
V
ppm/°C
µA
mV
mV
Ω
µV
ppm/kHr
∆V
Z
I
MIN
≤
I
R
≤
1mA
1mA
≤
I
R
≤
20mA
I
R
= 100µA
I
R
= 100µA, 10Hz
≤
f
≤
10kHz
I
R
= 100µA, T
A
= 25°C ± 0.1°C
15
1.5
20
1
60
20
LM385/385B-2.5
Parameter
Reverse Breakdown Voltage
Average Temperature Coefficient
Minimum Operating Current
Reverse Breakdown Voltage Chang
with Current
Reverse Dynamic Impedance
Wide Band Noise (RMS)
Long Term Stability
LM385
LM385B
Symbol
V
Z
∆V
Z
∆Temp
I
MIN
e
∆I
R
r
z
e
n
∆V
Z
∆Time
I
MIN
≤
I
R
≤
I
MAX
I
MIN
≤
I
R
≤
I
MAX
I
R
= 100µA
Test Conditions
LM385/385B-2.5
Min. Typ.
Max.
2.425
2.462
2.500
2.500
20
13
2.575
2.538
Units
V
V
ppm/°C
µA
mV
mV
Ω
µV
ppm/kHr
∆V
Z
I
MIN
≤
I
R
≤
1mA
1mA
≤
I
R
≤
20mA
I
R
= 100µA, f = 20Hz
I
R
= 100µA, 10Hz
≤
f
≤
10kHz
I
R
= 100µA, T
A
= 25°C ± 0.1°C
20
2
20
1
120
20
GRAPH / CURVE INDEX
Characteristic Curves
LM385/385B-1.2
FIGURE #
1.
2.
3.
4.
5.
6.
7.
RESPONSE TIME
REVERSE CHARACTERISTICS
FORWARD CHARACTERISTICS
TEMPERATURE DRIFT
REVERSE VOLTAGE CHANGE
REVERSE DYNAMIC IMPEDANCE
NOISE VOLTAGE
FIGURE #
8.
9.
Characteristic Curves
LM385/385B-2.5
RESPONSE TIME
REVERSE CHARACTERISTICS
10.
FORWARD CHARACTERISTICS
11.
TEMPERATURE DRIFT
12.
REVERSE DYNAMIC IMPEDANCE
13.
NOISE VOLTAGE
Copyright © 1996
Rev. 1.2 7/96
3
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