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SPX385N-L-2-5/TR

P1-P3P4-P6P7-P9
Date: 02/29/2008 SPX385-2.5 Micropower Voltage Reference © Copyright 2008 Exar Corporation
1
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
■ Temp Co 140ppm/°C
Micropower Voltage Reference
SPX385-2.5
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.
Figure 1: Block Diagram
APPLICATIONS
■ Battery Operating Equipment
■ Adjustable Supplies
■ Switching Power Supplies
Anode (A)
Cathode (K)
1.25V
+
-
500k
500k
DESCRIPTION
BLOCK DIAGRAM
SPX385
3 Pin SOT-23
Cathode
N/C
Anode
Refer to page 4 for pinouts.
Now Available in Lead Free Packaging
■ Error Amplifiers
■ Single Supply Amplifier
■ Monitors / VCR / TV
■ Personal Computers
Date: 02/29/208 SPX385-2.5 Micropower Voltage Reference © Copyright 2008 Exar Corporation
2
SPX385A-2.5 SPX385-2.5
PARAMETER CONDITIONS MIN. TYP. MAX MIN. TYP. MAX. UNIT
Reference Voltage 2.475 2.500 2.525 2.450 2.500 2.550 V
Dynamic Output F = 20Hz 0.6 1.0 0.6 1.0 Ω
Impedance I
R
= 100µA
Reference Voltage 20µA ≤ I
R
≤ 20mA 10 20 10 20 mV
Change with I
R
.
Temperature Coefficient Note 1 80 140 80 140 ppm/°C
Minimum Operating Current 15 20 15 20 µA
Output Wideband Noise 10Hz ≤ f ≤ 10kHz 120 120 µVrms
Long Term Stability T=1000Hr; 60 60 ppm
T
A
= 25°C ±0.1°C
Operating Temperature -40 +85 -40 +85 °C
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
I
IN
= 100µA, T
A
= 25°C, unless otherwise specified.
*CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC)
D
DV
KA
0153045607590105
-10
0.55000
000
0.07 mV/°C
0.003 %/°C
27 ppm/°C
TC in mV/°C=
TC in
%
/°C=
DV
KA
(mV)
DT
A
DT
A
DV
KA
at 2 5°C
DV
KA
x 100
()
TC in ppm/°C=
DT
A
DV
KA
at 25°C
DV
KA
x10
6
()
ppm
%
mV
Junction Temperature (°C)
Figure 2. V
KA
vs. Temperature
Note 1. Three-point measurement guarantees the error band over the specified temperature range.
ABSOLUTE MAXIMUM RATINGS
TYPICAL THERMAL RESISTANCES
PACKAGE 0
JA
0
JC
TYPICAL DERATING
TO-92 160°C/W 80°C/W 6.3 mW/°C
SOT-23 575°C/W 150°C/W 1.7 mW/°C
SOIC-8 175°C/W 45°C/W 5.7 mW/°C
SOT-89 110°C/W 8°C/W 9.1 mW/°C
Typical deratings of the thermal resistances are
given for ambient temperature >25°.
ELECTRICAL CHARACTERISTICS
Date: 02/29/2008 SPX385-2.5 Micropower Voltage Reference © Copyright 2008 Exar Corporation
3
Figure 3. Test Circuit
Figure 4. High Current Operating Characteristics
Figure 5. Reference Voltage vs. Ambient Temperature
Figure 6. Low Current Operating Characteristics
V
IN
V
KA
I
K
-2 -1 0123
-20
I
K
- Cathode Current (mA)
V
KA
- Cathode Voltage (V)
V
KA
Temperature Range: 0°C to 85°C
-15
-10
-5
0
5
10
15
20
25
30
V
KA
- Voltage (V)
T
A
- Ambient Temperature (°C)
90 120-60 -30 0 30 60
2.53
I
K
= 10mA
2.52
2.51
2.50
2.49
2.48
2.47
2.46
2.45
V
REF
= 2.500V at 25°C
45
85°C
V
KA
- Cathode Voltage (V)
I
K
- Cathode Current (µA)
30
15
0
-1.0 0 1.0 2.0 3.0
25°C
-0°C
Figure 7a. Precision 1µA to 1mA Current Sink
Figure 7b. Precision 1µA to 1mA Current Source
LM312
R1
68k
–
+
R2
C1
150pF
7
6
4
3
2
SPX385-2.5
I
OUT
*
-1.5V to -27V
-30V
* I
OUT
=
2.5V
R2
LM312
R1
68k
–
+
R2
C1
150pF
7
6
4
3
2
SPX385-2.5
I
OUT
*
1.5V to 27V
30V
* I
OUT
=
2.5V
R2
TYPICAL PERFORMANCE CHARACTERISTICS
P1-P3P4-P6P7-P9

SPX385N-L-2-5/TR

Mfr. #:
Buy SPX385N-L-2-5/TR
Manufacturer:
MaxLinear
Description:
Voltage References MICROPOWER VOLTAGE REFERENCE
Lifecycle:
New from this manufacturer.
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