ZN458
2.45V PRECISION REFERENCE REGULATOR
The ZN458 is a monolithic integrated circuit providing a
precise stable reference source of 2.45V in a two lead pack-
age without the need for an external shaping capacitor.
FEATURES
■Guaranteed 5mV Maximum Deviation over Full
Temperature Range
■Low Temperature Coefficient 0.003%/°C
■Low Slope Resistance - 0.1 Ohms
■Very Good Long Term Stability - 10ppm
■Low Noise - 10 microvolts
■Internally Shaped
■Tight Tolerance ±1.43%
■Two Pin Package
■Wide Operating Current 2-120mA
ABSOLUTE MAXIMUM RATINGS
Dissipation 300mW
Operating temperature range -20°C to +70°C
Storage temperature range -55°C to +150°C
DS3025 - 2.1
ORDERING INFORMATION
ZN458
ZN458A
ZN458B
99
49
29
TC
(ppm/°C)
-20°C to +70°C
-20°C to +70°C
-20°C to +70°C
Device Temperature
range
-VE+VE
CM2
Fig.1 Pin connection - bottom view
Fig.2 Circuit diagram
AV
-VE
+VE
BAND
GAP
REFERENCE
GND
R
R =
VS
VREF
VS - VREF
IREF
ZN458
2
ELECTRICAL CHARACTERISTICS (at Tamb = 25°C unless otherwise specified)
Output voltage
Slope resistance
Reference current
Maximum change ZN458
in VREF ZN458A
ZN458B
RMS noise voltage 1Hz-10kHz
VREF drift at 70°C
VREF
RREF
IREF
∆VREF
2.42
-
2.0
-
-
-
-
-
2.45
0.1
-
10
6
4
10
±10
2.49
0.2
120
22
11
6.5
-
-
V
Ω
mA
mV
mV
µV
ppm/1000
hours
Measured at 2mA
-20 to +70°C
Parameter Symbol Min. Typ. Max. Units Test conditions
10
1.0
0.1
0.1 1.0 10 100
FREQUENCY (kHz)
DYNAMIC IMPEDANCE (ohms)
IREF = 2mA
IREF = 20mA
Fig.3 Dynamic impedance
ZN458
3
0.4 0.8 1.2 1.6 2.0 2.4 2.8
10
-1
10
-2
10
-3
10
-4
FORWARD VOLTAGE (V)
FORWARD CURRENT (A)
0102030 40 50 60 70 80
-10
-8
-6
-4
-2
0
2
4
6
8
10
TEMPERATURE (°C)
CHANGE IN REFERENCE VOLTAGE, δV (mV)
ZN458
Fig.4 Forward characteristic Fig.5 Temperature characteristic (typical)
0102030 40 50 60 70 80
-5
-4
-3
-2
-1
0
1
2
3
4
5
TEMPERATURE (°C)
CHANGE IN REFERENCE VOLTAGE, δV (mV)
ZN458A
Fig.6 Temperature characteristic (typical)
0102030 40 50 60 70 80
-5
-4
-3
-2
-1
0
1
2
3
4
5
TEMPERATURE (°C)
CHANGE IN REFERENCE VOLTAGE, δV (mV)
ZN458B
Fig.7 Temperature characteristic (typical)
ZN458
4
-30 -20 -10 0 10 20 25 30 40 50 60 70
AMBIENT TEMPERATURE (C)
140
120
100
80
75
60
40
20
0
I
REF
(max.)
(mA)
Fig.8 Derating curve
ZN458
5
ZN458
6
HEADQUARTERS OPERATIONS
GEC PLESSEY SEMICONDUCTORS
Cheney Manor, Swindon,
Wiltshire SN2 2QW, United Kingdom.
Tel: (0793) 518000
Fax: (0793) 518411
GEC PLESSEY SEMICONDUCTORS
P.O. Box 660017
1500 Green Hills Road,
Scotts Valley, California 95067-0017,
United States of America.
Tel: (408) 438 2900
Fax: (408) 438 5576
CUSTOMER SERVICE CENTRES
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• ITALY Milan Tel: (02) 66040867 Fax: (02) 66040993
• JAPAN Tokyo Tel: (03) 5276-5501 Fax: (03) 5276-5510
• NORTH AMERICA Integrated Circuits and Microwave Products Scotts Valley, USA
Tel (408) 438 2900 Fax: (408) 438 7023.
Hybrid Products, Farmingdale, USA Tel (516) 293 8686 Fax: (516) 293 0061.
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Swindon Tel: (0793) 518510 Fax : (0793) 518582
These are supported by Agents and Distributors in major countries world-wide.
© GEC Plessey Semiconductors 1994 Publication No. DS3025 Issue No. 2.1 January 1994
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and to ensure that any publication or data used is up to date and has not been superseded. These products are not suitable for use in any medical products whose failure to perform may result in significant injury
or death to the user. All products and materials are sold and services provided subject to the Company's conditions of sale, which are available on request.
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data used is up to date and has not been superseded. Manufacturing does not necessarily include testing of all functions or parameters. These products are not suitable for use in
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