Microsemi LM385B 1.2 & 2.5v micropower voltage reference Datasheet

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
D
R O D U C T I O N
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
A T A
S
H E E T
K E Y F E AT U R E S
■ GUARANTEED 1% INITIAL ACCURACY
(LM385B-1.2)
■ GUARANTEED 2.5% INITIAL ACCURACY
(LM385-1.2)
■ GUARANTEED 1.5% INITIAL ACCURACY
(LM385B-2.5)
■ 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
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.
A P P L I C AT I O N 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
MICROPOWER REFERENCE FROM
9V BATTERY
5V
9V
200k
38k
2.5V
1.2V
LM385-2.5V
LM385-1.2V
PA C K A G E O R D E R I N F O R M AT I O N
Reference
Voltage
TA (°C)
1.2V
0 to 70
2.5V
Initial
Tolerance
SOIC
DM Plastic
8-pin
TO-92
LP Plastic
3-pin
±30mV
LM385DM-1.2
LM385LP-1.2
±12mV
±75mV
±38mV
LM385BDM-1.2
LM385DM-2.5
LM385BDM-2.5
LM385BLP-1.2
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)
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
A B S O L U T E M A X I M U M R AT I N G S
D
A T A
S
H E E T
PACKAGE PIN OUTS
(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
8.
2.
7.
3.
4.
DM PACKAGE
(Top View)
2. CATHODE
3. N/C
DM PACKAGE:
165ºC/W
LP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA
CATHODE
N/C
6. CATHODE
5. N/C
1.
1. ANODE
T H E R MAL DATA
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA
N/C
N/C
N/C
ANODE
165ºC/W
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 TA = 25ºC. Typ number represents TA = 25ºC value.)
LM385/385B-1.2
Parameter
Reverse Breakdown Voltage
Symbol
LM385
LM385B
VZ
∆VZ
∆Temp
IMIN
e
∆IR
rz
en
∆VZ
∆Time
Average Temperature Coefficient
Minimum Operating Current
Reverse Breakdown Voltage Chang
with Current
Reverse Dynamic Impedance
Wide Band Noise (RMS)
Long Term Stability
LM385/385B-1.2
Min. Typ.
Max.
Test Conditions
IMIN ≤ IR ≤ IMAX
IMIN ≤ IR ≤ IMAX
IR = 100µA
1.205
1.223
∆VZ
IMIN ≤ IR ≤ 1mA
1mA ≤ IR ≤ 20mA
IR = 100µA
IR = 100µA, 10Hz ≤ f ≤ 10kHz
IR = 100µA, TA = 25°C ± 0.1°C
Units
1.235
1.235
20
1.260
1.247
V
V
ppm/°C
8
15
1.5
20
µA
mV
mV
Ω
µV
ppm/kHr
1
60
20
LM385/385B-2.5
Parameter
Reverse Breakdown Voltage
Symbol
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
LM385/385B-2.5
Min. Typ.
Max.
Test Conditions
IMIN ≤ IR ≤ IMAX
IMIN ≤ IR ≤ IMAX
IR = 100µA
2.425
2.462
∆VZ
IMIN ≤ IR ≤ 1mA
1mA ≤ IR ≤ 20mA
IR = 100µA, f = 20Hz
IR = 100µA, 10Hz ≤ f ≤ 10kHz
IR = 100µA, TA = 25°C ± 0.1°C
Units
2.500
2.500
20
2.575
2.538
V
V
ppm/°C
13
20
2
20
µA
mV
mV
Ω
µV
ppm/kHr
1
120
20
GRAPH / CURVE INDEX
Characteristic Curves
LM385/385B-1.2
Characteristic Curves
LM385/385B-2.5
FIGURE #
FIGURE #
1.
RESPONSE TIME
8.
RESPONSE TIME
2.
REVERSE CHARACTERISTICS
9.
REVERSE CHARACTERISTICS
3.
FORWARD CHARACTERISTICS
10. FORWARD CHARACTERISTICS
4.
TEMPERATURE DRIFT
11. TEMPERATURE DRIFT
5.
REVERSE VOLTAGE CHANGE
12. REVERSE DYNAMIC IMPEDANCE
6.
REVERSE DYNAMIC IMPEDANCE
13. NOISE VOLTAGE
7.
NOISE VOLTAGE
Copyright © 1996
Rev. 1.2 7/96
3
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
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
FIGURE 2. — REVERSE CHARACTERISTICS
1.5V
TA = 0 to 70°C
1.0V
VIN
0.5V
36k
Reverse Current - (µA)
Output Voltage
100
VOUT
Input Voltage
0
5V
10
1
0
0.1
0
50
100
500
0
550
0.2
0.4
Time - (µs)
0.8
1.0
1.2
1.4
Reverse Voltage - (V)
FIGURE 3. — FORWARD CHARACTERISTICS
FIGURE 4. — TEMPERATURE DRIFT
1.242
1.2
IR = 100µA
TA = 25°C
1.24
Reference Voltage - (V)
Forward Voltage - (V)
0.6
0.8
0.4
1.238
1.236
1.234
1.232
1.23
1.228
0
0.01
1.226
0.1
1
10
Forward Current - (mA)
4
100
0
10
20
30
40
50
60
70
Temperature - (°C)
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
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 5. — REVERSE VOLTAGE CHANGE
FIGURE 6. — REVERSE DYNAMIC IMPEDANCE
16
1000
TA = 25°C
IR = 100µA
12
TA = 0 to 70°C
Dynamic Impedance - (Ω)
Output Voltage Change - (mV)
14
10
8
6
4
2
0
100
10
1
-2
-4
0.01
0.1
0.1
1
10
100
Reverse Current - (mA)
10
100
1k
10k
100k
(f) Frequency - (Hz)
FIGURE 7. — NOISE VOLTAGE
800
(VN) Noise Voltage - (nV/ Hz)
700
600
500
400
300
200
100
10
IR = 100µA
TA = 25°C
100
1k
10k
100k
(f) Frequency - (Hz)
Copyright © 1996
Rev. 1.2 7/96
5
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
C H A R A C T E R I S T I C C U R V E S — LM385/385B-2.5V
FIGURE 9. — REVERSE CHARACTERISTICS
TA = 25°C
2.0V
VIN
24K
VOUT
0
Input Voltage
TA = 25°C
100
4.0V
Reverse Current - (µA)
Output Voltage
FIGURE 8. — RESPONSE TIME
10
1
5
0
0.1
0
1.0
Time - (100µs/Div.)
2.0
3.0
4.0
5.0
Reverse Voltage - (V)
FIGURE 10. — FORWARD CHARACTERISTICS
FIGURE 11. — TEMPERATURE DRIFT
1.0
2.52
TA = 25°C
2.515
Reference Voltage - (V)
Forward Voltage - (V)
0.8
0.6
0.4
2.51
2.505
2.5
2.495
2.49
0.2
2.485
0
0.001
0.01
0.1
1
Forward Current - (mA)
6
10
100
2.48
-40
20
0
20
40
60
80
100
Temperature - (°C)
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
C H A R A C T E R I S T I C C U R V E S — LM385/385B-2.5V
FIGURE 12. — REVERSE DYNAMIC IMPEDANCE
FIGURE 13. — NOISE VOLTAGE
100
(VN) Noise Voltage - (nV/ Hz)
Dynamic Impedance - (Ω)
TA = 25°C
IR = 100µA
10
1
1800
1500
1200
900
600
300
0.1
10
100
1k
10k
(f) Frequency - (Hz)
Copyright © 1996
Rev. 1.2 7/96
100k
10
IR = 100µA
TA = 25°C
100
1k
10k
100k
(f) Frequency - (Hz)
7
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