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Voltage Reference. SPX385-5.0 Datasheet |
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SPX385-5.0
5V Micropower Voltage Reference
FEATURES
N/C
■ Trimmed Bandgap .......................................... 1%
■ Wide Operating Current ............... 50µA to 20mA
■ Extended Temperature Range ... -40°C to +85°C
SPX385
3 Pin SOT-23
■ Dynamic Impedance .............................. 1Ω max
Cathode
Anode
■ Offered in Small SOT-23, TO-92, NSOIC, and
SOT-89
■ Low Cost Solution
APPLICATIONS
NC 1
NC 2
NC 3
Anode 4
SPX385
8 Pin nSOIC
8 Cathode
7 NC
6 NC
5 NC
■ Battery Operated Equipment
■ Adjustable Supplies
Now Available in Lead Free Packaging
■ Switching Power Supplies
■ Error Amplifiers
■ Single Supply Amplifier
■ Monitors / VCR / TV
■ Personal Computers
■ Power use meter
DESCRIPTION
The SPX385-5.0 is a micropower 2-terminal band-gap voltage reference with a very wide
operating current range from 50µA to 20mA that provides a stable voltage.
The SPX385-5.0 is available in SOT-23, TO-92, NSOIC, and SOT-89 packages with an
operating temperature range of -40°C to 85°C. A 1.2 and 2.5 volt device are also available -
SPX385-1.2, SPX385-2.5.
BLOCK DIAGRAM
Cathode (K)
1.5M
500k
Figure 1: Block Diagram
Date: 2/11/06
+
-
1.25V
Anode (A)
SPX385-5.0 Micropower Voltage Reference
1
© Copyright 2005 Sipex Corporation
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ABSOLUTE MAXIMUM RATINGS
Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS 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 (IKA) ............................................................. 30mA
Forward Current (I ) ............................................................. 10mA
AK
Operating Temperature Range (TA) ............................ -40 to +85°C
Junction Temperature (TJ) ..................................................... 150°C
Storage
Temperature
(T ) .......................................
STG
-
65
to
150°C
Lead Temperature (Soldering 10 sec.), TL ............................. 300°C
ELECTRICAL CHARACTERISTICS
IIN = 100µA, TA = 25°C, unless otherwise specified. The ♦ denotes the specifications which apply over the full operating
temperature range.
PARAMETER
MIN. TYP. MAX
UNIT
CONDITIONS
Reference Voltage
4.90 5.00
4.95 5.00
5.10
5.05
♦
V
2%
1%
Dynamic Output
Impedance
Reference Voltage
Change with IR.
Temperature Coefficient
0.6 1.0
10 20
30 50
♦Ω
♦
♦ mV
F = 20Hz
IR = 100µA
20µA ≤ IR ≤ 20mA
♦ ppm/°C
Note 1
Minimum Operating Current 30
50 ♦ µA
Output Wideband Noise
120 ♦ µVrms 10Hz ≤ f ≤ 10kHz
Long Term Stability
Operating Temperature
60
-40 +85
♦ ppm
°C
T=1000Hr;
TA = 25°C ±0.1°C
Note 1. Three-point measurement guarantees the error band over the specified temperature range.
*CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC)
ppm %
00
mV
0
5000 0.5
-10
∆VKA
∆T
0 15 30 45 60 75 90 105
Junction Temperature (°C)
TC in mV/°C =
∆VKA (mV)
∆TA
( )TC in % /°C =
∆VKA
∆VKA at 25°C
x 100
∆TA
( )∆VKA
∆VKA at 25°C
x 106
TC in ppm/°C =
∆TA
0.07 mV/°C
0.003 %/°C
27 ppm/°C
Figure 2. VKA vs. Temperature
Date: 2/11/06
SPX385-5.0 Micropower Voltage Reference
2
© Copyright 2005 Sipex Corporation
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TYPICAL PERFORMANCE CHARACTERISTICS
VIN
VKA
IK
9V
200k
5.0V
SPX385-5.0
Figure 1. Improving Regulation of Adjustable Regula-
tors
*
IOUT
=
2.5V
R2
30V SPX385-5.0
R1
68k
IOUT*
1.5V to 27V
2– 7
LM312
3
+4
C1
150pF
6
R2
Figure 3. Precision 1µA to 1mA Current Source
Figure 2. Micropower Reference from 9V Battery
500k
IQ
VIN = 15V
7
2+
3 LM4250C
-8
6
4
22M
10V
500k
150pF
SPX385-5.0
500k
IQ ≅ 30µA Standby Current
Figure 4: Precision Micropower 10V Reference
Date: 2/11/06
SPX385-5.0 Micropower Voltage Reference
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© Copyright 2005 Sipex Corporation
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