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PRECISION 2.5 VOLT MICROPOWER VOLTAGE REFERENCE
ISSUE 2 - FEBRUARY 1998 DEVICE DESCRIPTION
The ZREF25 uses a bandgap circuit design to achieve a precision micropower voltage reference of 2.5 volts. The device is available in a small outline surface mount package, ideal for applications where space saving is important as well as packages for through hole requirements. The ZREF25 design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZREF25 is recommended for operation between 50A and 5mA and so is ideally suited to low power and battery powered applications. Excellent performance is maintained to an absolute maximum of 25mA, however the rugged design and 20 volt processing allows the reference to withstand transient effects and currents up to 200mA. Superior switching capability allows the device to reach stable operating conditions in only a few microseconds.
ZREF25
FEATURES
* * * * * * * * * * * * * * *
Small outline SO8 and TO92 style packages. No stabilising capacitor required Typical TC 30ppm/C Typical slope resistance 0.4 2% and 1% tolerance Industrial temperature range (Military temperature range available on request) Operating current 50A to 5mA Transient response, stable in less than 10s Alternative package options and tolerances are available
APPLICATIONS
Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Test equipment. Data acquisition systems. Precision power supplies.
SCHEMATIC DIAGRAM
VR
G nd
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ZREF25
ABSOLUTE MAXIMUM RATING
Reverse Current Forward Current Operating Temperature Storage Temperature 25mA 25mA -40 to 85C -55 to 125C Power Dissipation (Tamb=25C) E-Line, 3 pin (TO92) 500mW E-Line, 2 pin (TO92) 500mW SO8 625mW
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated) Tamb=25C
SYMBOL PARAMETER CONDITIONS MIN VR IMIN IR TC RS ZR Reverse Breakdown Voltage Minimum Operating Current Recommended Operating Current Average Reverse Breakdown Voltage Temp. Co. I R(min) to IR(max) Slope Resistance Reverse Dynamic Impedance IR = 1mA f = 100Hz IAC= 0.1 IR IR = 150A f = 10Hz to 10kHz 0.05 30 0.4 0.3 IR=150A LIMITS TYP MAX 2.525 1 2.55 2 50 5 90 2 0.8 V A mA ppm/C TOL. % UNITS
2.475 2.5 2.45 2.5 25
EN
Wideband Noise Voltage
45 V(rms)
Reverse Current (A)
TC =
(VR(max)-VR(min)) x 1000000 VR x (T(max)-T(min))
60 50 40 30 20 10 0 0.2 0.6 1.0 1.4 1.8 2.2 2.6
Note: VR(max) - VR(min) is the maximum deviation in reference voltage measured over the full operating temperature range.
RS =
VR Change(IR (min) to IR (max))
IR (max) - IR (min)
5C =8 TA 5C C =2 TA -40 = TA
Reverse Voltage (V)
Reverse Characteristics
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ZREF25
TYPICAL CHARACTERISTICS
1.4 2.53 IR =150A to 5mA
Forward Voltage (V)
1.0 0.8 0.6 0.4 0.2 0.1 1 10 100 1000
Reference voltage (V)
1.2
2.52 2.51 2.50 2.49 2.48 2.47 -40 -20 0 20 40 60 80
Forward Current (mA)
Temperature (C)
Forward Characteristics
Temperature Drift
1000
IR=150A
Slope resistance ()
Slope resistance ()
1.0
100
10
IR=1mA
0.5 TA=-40C TA=25C TA=85C 0 0.1 1 10
IR=5mA
1
0.1 0.01 0.1 1 10 100
Reference Current (mA)
Frequency (kHz)
Slope Resistance v Current
Slope Resistance v Frequency
3.0
3.0
VR - (V)
INPUT 50K OUTPUT
VR - (V)
2.0
2.0
INPUT 1K5 OUTPUT
1.0
1.0
0 10
0 10
VIN - (V)
VIN - (V)
0 0 1 2 3 4
0 0 0.1 0.2 0.3 0.4
Time (s)
Time (s)
Transient Response (IR=150A)
Transient Response (IR=5mA)
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ZREF25
CONNECTION DIAGRAMS
E-Line, 2 pin Package Suffix - Y E-Line, 3 pin,Rev Package Suffix - R
Bottom View
Bottom View - Pin 3 floating or connected to pin 1
SO8 Package Suffix - N8
Top View
ORDERING INFORMATION
Part No Tol% Package Partmark
ZREF25D02 ZREF25D ZREF25Z02 ZREF25Z ZREF2502 ZREF25
2 1 2 1 2 1
SO8 SO8 E-Line * E-Line * E-Line E-Line
ZREF2502 ZREF25 ZREF2502 ZREF25 ZREF2502 ZREF25
* E-Line 3 pin Reversed E-Line 2 pin
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