SPX385-2.5
Micropower Voltage Reference
FEATURES
■
Trimmed Bandgap ............................ 1% and 2%
■
Wide Operating Current ............... 20µA to 20mA
■
Extended Temperature Range ... -40°C to +85°C
■
Dynamic Impedance .............................. 1Ω max
■
Offered in SOT-23, TO-92, SOIC, and SOT-89
■
Improved Replacement for LM185/285/385-2.5V,
AS385-2.5
■
Low Cost Solution
APPLICATIONS
■
Battery Operating Equipment
■
Adjustable Supplies
■
Switching Power Supplies
■
Error Amplifiers
■
Single Supply Amplifier
■
Monitors / VCR / TV
■
Personal Computers
N/C
SPX385
3 Pin SOT-23
Cathode
Anode
Refer to page 4 for pinouts.
DESCRIPTION
The SPX385-2.5 is a micropower 2-terminal band-gap voltage reference with a very wide
operating current range from 20µA to 20mA that provides a stable voltage. The high stability of
this device is primarily the result of the low temperature coefficient Thin Film Resistor process and
Laser Trimming of the output voltage at the wafer level.
The SPX385-2.5 is available in a SOT-23, TO-92, SOIC-8 and SOT-89 package with an operating
temperature range of -40°C to 85°C. A 1.2 and 5 volt device is also available - SPX385-1.2 and
SPX385-5.
BLOCK DIAGRAM
Cathode (K)
500k
+
-
500k
1.25V
Figure 1: Block Diagram
Date:05/21/04
Anode (A)
SPX385-2.5 Micropower Voltage Reference
© Copyright 2004 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
Stresses greater than those listed under ABSOLUTE MAXIMUM RAT-
INGS may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions
above those indicated in the operational sections of this specification is not
implied. Exposure to absolute maximum rating conditions for extended
periods may affect reliability.
Reverse Current (I
KA
) ............................................................. 30mA
Forward Current (I
AK
) ............................................................. 10mA
Operating Temperature Range (T
A
) ............................ -40 to +85°C
Junction Temperature (T
J
) ..................................................... 150°C
Storage Temperature (T
STG
) ....................................... - 65 to 150°C
Lead Temperature (Soldering 10 sec.), T
L
............................. 300°C
TYPICAL THERMAL RESISTANCES
PACKAGE
0
JA
0
JC
TYPICAL DERATING
TO-92
SOT-23
SOIC-8
SOT-89
160°C/W 80°C/W
575°C/W 150°C/W
175°C/W 45°C/W
110°C/W
8°C/W
6.3 mW/°C
1.7 mW/°C
5.7 mW/°C
9.1 mW/°C
Typical deratings of the thermal resistances are
given for ambient temperature >25°.
ELECTRICAL CHARACTERISTICS
I
IN
= 100µA, T
A
= 25°C, unless otherwise specified.
PARAMETER
Reference Voltage
Dynamic Output
Impedance
Reference Voltage
Change with I
R
.
Temperature Coefficient
Minimum Operating Current
Output Wideband Noise
Long Term Stability
Operating Temperature
10Hz
≤
f
≤
10kHz
T=1000Hr;
T
A
= 25°C
±0.1°C
-40
F = 20Hz
I
R
= 100µA
20µA
≤
I
R
≤
20mA
Note 1
CONDITIONS
SPX385A-2.5
MIN. TYP. MAX
2.475 2.500
0.6
10
60
15
120
60
+85
-40
2.525
1.0
20
100
20
SPX385-2.5
MIN. TYP. MAX.
2.450
2.500
0.6
10
60
15
120
60
+85
2.550
1.0
20
100
20
UNIT
V
Ω
mV
ppm/°C
µA
µVrms
ppm
°C
Note 1. Three-point measurement guarantees the error band over the specified temperature range.
*CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC)
ppm
0
%
0
mV
0
DV
KA
TC in mV/°C =
D
DV
KA
(mV)
DT
A
-10
5000
0.5
TC in % /°C =
(
DV
KA
DV
KA
at 25°C
DT
A
)
x 100
0
15
30
45
60
75
90
105
TC in ppm/°C =
(
DV
KA
DV
KA
at 25°C
DT
A
)
x 10
6
Junction Temperature (°C)
0.07 mV/°C
0.003 %/°C
27 ppm/°C
Figure 2. V
KA
vs. Temperature
Date:05/21/04
SPX385-2.5 Micropower Voltage Reference
© Copyright 2004 Sipex Corporation
2
TYPICAL PERFORMANCE CHARACTERISTICS
30
25
V
IN
V
KA
Temperature Range: 0°C to 85°C
V
KA
I
K
- Cathode Current (mA)
20
15
10
I
K
5
0
-5
-10
-15
-20
-2
-1
0
1
2
3
V
KA
- Cathode Voltage (V)
Figure 3. Test Circuit
Figure 4. High Current Operating Characteristics
45
2.53
I
K
= 10mA
2.52
2.51
30
2.50
V
REF
= 2.500V at 25°C
2.49
I
K
- Cathode Current (µA)
V
KA
- Voltage (V)
85°C
15
25°C
-0°C
2.48
2.47
0
2.46
2.45
-60
-30
0
30
60
90
120
-1.0
0
1.0
2.0
3.0
T
A
- Ambient Temperature (°C)
V
KA
- Cathode Voltage (V)
Figure 5. Reference Voltage vs. Ambient Temperature
SPX385-2.5
Figure 6. Low Current Operating Characteristics
* I
OUT
= 2.5V
R2
* I
OUT
= 2.5V
R2
30V
SPX385-2.5
R1
68k
C1
150pF
2
–
7
6
R1
68k
C1
150pF
2
–
7
6
LM312
3
LM312
3
+
4
+
4
I
OUT
*
-1.5V to -27V
-30V
R2
1.5V to 27V
I
OUT
*
R2
Figure 7a. Precision 1µA to 1mA Current Sink
Date:05/21/04
Figure 7b. Precision 1µA to 1mA Current Source
© Copyright 2004 Sipex Corporation
SPX385-2.5 Micropower Voltage Reference
3
TYPICAL PERFORMANCE CHARACTERISTICS
9V
V
IN
LM338
375
5V
200k
SPX385-2.5
2.5V
SPX385-2.5
120
Figure 8. Improving Regulation of Adjustable Regula-
tors
Figure 9. Micropower Reference from 9V Battery
I
Q
V
IN
= 3.7V to 30V
V
IN
= 15V
500k
7
+
3
LM4250C
-
8
2
6
10V
LM334
3.3k
OUT
2.5V
SPX385-2.5
4
22M
150pF
1.5M
SPX385-2.5
500k
I
Q
≅
30µA Standby Current
Figure 10. Wide Input Range Reference
Figure 11: Precision Micropower 10V Reference
PACKAGE PINOUTS
8-Pin NSOIC
N/C
N/C
N/C
ANODE
1
2
3
4
8
7
6
5
CATHODE
N/C
N/C
N/C
N/C
1
CATHODE
2
ANODE
1
2
3
ANODE
CATHODE
1
2
3
SOT-23-3 (M)
3
SOT-89 (M1)
TO-92 (N)
N/C ANODE CATHODE
N/C
Top View
Top View
Top View
Bottom View
Date:05/21/04
SPX385-2.5 Micropower Voltage Reference
© Copyright 2004 Sipex Corporation
4
PACKAGE: 3 PIN SOT-23
D
b
3
B
B
E1
E
SEE VIEW C
VIEW A-A
1
e
2
SEE VIEW D
e1
L
Gauge Plane
Seating Plane
Ø
VIEW C
Dimensions in (mm)
3 PIN SOT-23
A
A1
A2
b
c
D
e
e1
E
E1
L
L2
Ø
MIN
-
0
NOM MAX
-
-
1.25
0.10
1.150
0.45
0.20
A
A
A2
Seating Plane
1.050 1.100
0.36
0.15
0.38
-
A
C
A1
SIDE VIEW
b
WITH PLATING
2.901 2.926
0.925 0.950
1.850
1.900
2.951
0.975
1.950
2.900
1.651
0.53
0.05
8º
L2
BASE METAL
SECTION B-B
c
2.700 2.800
1.601
0.37
-
0º
1.626
0.45
-
-
VIEW D
3 PIN SOT-23
Date:05/21/04
SPX385-2.5 Micropower Voltage Reference
© Copyright 2004 Sipex Corporation
5
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