P
RODUCTION
D
ATA
S
HEET
T
HE
I
NFINITE
P
OWER OF
I
NNOVATION
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861
W
ESTERN
A
VENUE
,
G
ARDEN
G
ROVE
,
CA.
92841,
714-898-8121,
F
AX
:
714-893-2570
1
Copyright © 1996
Rev. 1.2a,2005-03-08
LM385 / 385B
1.2
&
2.5V
M
ICROPOWER
V
OLTAGE
R
EFERENCE
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 LX385/385B-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
current. 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 provides 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-to-
pin replacement for the LM385/385B family of
voltage references.
IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com
KEY FEATURES
Guaranteed 1% Initial Accuracy
(LM385B-1.2)
Guaranteed 2.5% Initial
Accuracy (LM385-1.2)
Guaranteed 1.5% Initial
Accuracy (LM385B-2.5)
Guaranteed 3.0% Initial
Accuracy (LM385-2.5)
Guaranteed 20µA Operating
Current
Low Temperature coefficient
Operating Current of 20µA to
20mA
Very Low Dynamic Impedance:
10Ω
APPLICATIONS
Portable Meter References
Portable Test Instruments
Battery Operated Systems
Current Loop Instrumentation
PRODUCT HIGHLIGHT
1.2V
R
EFERENCE
38K
LM385-1.2V
5V
1.2V
M
ICROPOWER
R
EFERENCED
F
ROM
9V
B
ATTERY
200K
LM385-2.5V
9V
2.5V
PACKAGE ORDER INFO
DM
Plastic SOIC
8-Pin
LP
Plastic TO-92
3-Pin
T
A
(°C) Reference
Voltage Initial
Tolerance
RoHS Compliant / Pb-free
Transition DC: 0440 RoHS Compliant / Pb-free
Transition DC: 0509
±30mV LM385DM-1.2 LM385LP-1.2
1.2V ±12mV LM385BDM-1.2 LM385BLP-1.2
±75mV LM385DM-2.5 LM385LP-2.5
0 to 70 2.5V ±38mV LM385BDM-2.5 LM385BLP-2.5
Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX385BDM-TR)
1.2 & 2.5V M
ICROPOWER
V
OLTAGE
R
EFERENCE
LM385/385B
PRODUCT DATABOOK 1996/1997
Copyright © 1996
Rev. 1.2a 8/04
2
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS (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
THERMAL DATA
DM PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θθ
θθ
θJA 165ºC/W
LP PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θθ
θθ
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)
8.
7.
6.
5.
1.
2.
3 .
4.
N/C
N/C
N/C
ANODE
CATHODE
N/C
CATHODE
N/C
DM PACKAGE
(Top View)
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
Pb-free / RoHS Peak Package Solder Reflow Temp (40second max. exposure)................260°C (+0, -5)
100% Pb-free / RoHS Matte Tin Lead Finish
1.2 & 2.5V M
ICROPOWER
V
OLTAGE
R
EFERENCE
LM385/385B
PRODUCT DATABOOK 1996/1997
3
Copyright © 1996
Rev. 1.2a 8/04
PRODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply to TA = 25ºC. Typ number represents TA = 25ºC value.)
Parameter
Symbol
Test Conditions Units
LM385/385B-1.2
Min. Typ. Max.
1.205 1.235 1.260 V
1.223 1.235 1.247 V
20 ppm/°C
815µA
1.5 mV
20 mV
1Ω
60 µV
20 ppm/kHr
Reverse Breakdown Voltage LM385 VZIMIN
≤ IR ≤ IMAX
LM385B IMIN
≤ IR ≤ IMAX
Average Temperature Coefficient ∆VZIR = 100µA
∆Temp
Minimum Operating Current IMIN
Reverse Breakdown Voltage Chang e ∆VZIMIN
≤ IR ≤ 1mA
with Current ∆IR1mA ≤ IR ≤ 20mA
Reverse Dynamic Impedance rzIR = 100µA
Wide Band Noise (RMS) enIR = 100µA, 10Hz ≤ f ≤ 10kHz
Long Term Stability ∆VZIR = 100µA, TA = 25°C ± 0.1°C
∆Time
GRAPH / CURVE INDEX
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
Parameter
Symbol
Test Conditions Units
LM385/385B-2.5
Min. Typ. Max.
2.425 2.500 2.575 V
2.462 2.500 2.538 V
20 ppm/°C
13 20 µA
2mV
20 mV
1Ω
120 µV
20 ppm/kHr
Reverse Breakdown Voltage LM385 VZIMIN
≤ IR ≤ IMAX
LM385B IMIN
≤ IR ≤ IMAX
Average Temperature Coefficient ∆VZIR = 100µA
∆Temp
Minimum Operating Current IMIN
Reverse Breakdown Voltage Chang e ∆VZIMIN
≤ IR ≤ 1mA
with Current ∆IR1mA ≤ IR ≤ 20mA
Reverse Dynamic Impedance rzIR = 100µA, f = 20Hz
Wide Band Noise (RMS) enIR = 100µA, 10Hz ≤ f ≤ 10kHz
Long Term Stability ∆VZIR = 100µA, TA = 25°C ± 0.1°C
∆Time
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
LM385/385B-1.2
LM385/385B-2.5
1.2 & 2.5V M
ICROPOWER
V
OLTAGE
R
EFERENCE
LM385/385B
PRODUCT DATABOOK 1996/1997
Copyright © 1996
Rev. 1.2a 8/04
4
PRODUCTION DATA SHEET
CHARACTERISTIC CURVES — LM385/385B-1.2V
FIGURE 2. — REVERSE CHARACTERISTICS
FIGURE 3. — FORWARD CHARACTERISTICS FIGURE 4. — TEMPERATURE DRIFT
FIGURE 1. — RESPONSE TIME
Reverse Voltage - (V)
Reverse Current - (µA)
0.1
0 0.2 0.4 0.6 0.8 1.0
1
10
100
T
A
= 0 to 70°C
1.2 1.4
0
Forward Current - (mA)
Forward Voltage - (V)
0.4
0.01 0.1 110 100
0.8
1.2
T
A
= 25°C
Temperature - (°C)
Reference Voltage - (V)
1.226
02030406070
1.23
1.236
1.242
1.232
1.24
10 50
1.228
1.234
1.238
I
R
= 100µA
Time - (µs)
Output Voltage
0
5V
0
1.0V
Input Voltage
0.5V
1.5V
V
IN
V
OUT
36k
0 50 100 500 550
1.2 & 2.5V M
ICROPOWER
V
OLTAGE
R
EFERENCE
LM385/385B
PRODUCT DATABOOK 1996/1997
5
Copyright © 1996
Rev. 1.2a 8/04
PRODUCTION DATA SHEET
CHARACTERISTIC CURVES — LM385/385B-1.2V
FIGURE 6. — REVERSE DYNAMIC IMPEDANCE
FIGURE 7. — NOISE VOLTAGE
FIGURE 5. — REVERSE VOLTAGE CHANGE
0.1
(f) Frequency - (Hz)
Dynamic Impedance - (Ω)
1
10 100 1k 10k 100k
10
1000
T
A
= 25°C
I
R
= 100µA
100
100
(f) Frequency - (Hz)
(V
N
) Noise Voltage - (nV/ Hz)
300
10 100 1k 10k 100
k
600
700
400
500
I
R
= 100µA
T
A
= 25°C
200
800
Reverse Current - (mA)
Output Voltage Change - (mV)
-4
0.01 0.1 1 10 100
0
6
12
2
10
-2
4
8
14
16
T
A
= 0 to 70°C
1.2 & 2.5V M
ICROPOWER
V
OLTAGE
R
EFERENCE
LM385/385B
PRODUCT DATABOOK 1996/1997
Copyright © 1996
Rev. 1.2a 8/04
6
PRODUCTION DATA SHEET
CHARACTERISTIC CURVES — LM385/385B-2.5V
FIGURE 9. — REVERSE CHARACTERISTICS
FIGURE 10. — FORWARD CHARACTERISTICS FIGURE 11. — TEMPERATURE DRIFT
FIGURE 8. — RESPONSE TIME
Reverse Voltage - (V)
Reverse Current - (µA)
0.1
0 1.0 2.0 3.0 4.0 5.0
1
10
100
T
A
= 25°C
Forward Current - (mA)
Forward Voltage - (V)
0
0.001 0.01 0.1 1 10 100
0.2
0.6
1.0
T
A
= 25°C
0.4
0.8
Temperature - (°C)
Reference Voltage - (V)
2.48
-40 0 20 40 80 100
2.49
2.505
2.52
2.495
2.515
20 60
2.485
2.5
2.51
Time -
(
100µs/Div.
)
Output Voltage
0
5
0
2.0V
4.0V
Input Voltage
T
A
= 25°C
V
IN
V
OUT
24K
1.2 & 2.5V M
ICROPOWER
V
OLTAGE
R
EFERENCE
LM385/385B
PRODUCT DATABOOK 1996/1997
7
Copyright © 1996
Rev. 1.2a 8/04
PRODUCTION DATA SHEET
CHARACTERISTIC CURVES — LM385/385B-2.5V
FIGURE 13. — NOISE VOLTAGE
FIGURE 12. — REVERSE DYNAMIC IMPEDANCE
300
(f) Frequency - (Hz)
(V
N
) Noise Voltage - (nV/ Hz)
600
10 100 1k 10k 100k
1500
1800
900
1200
I
R
= 100µA
T
A
= 25°C
(f) Frequency - (Hz)
Dynamic Impedance - (Ω)
0.1
10 100 1k 100
k
10
100
1
10k
T
A
= 25°C
I
R
= 100µA
