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PRECISION 2.5 VOLT LOW KNEE CURRENT VOLTAGE REFERENCE
ISSUE 4 - JANUARY 2003 DEVICE DESCRIPTION
The ZRC250 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 a package for through hole requirements. The ZRC250 design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZRC250 is recommended for operation between 20A 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 an d cu rrents up to 200mA. Superior switching capability allows the device to reach stable operating conditions in only a few microseconds. FEATURES
ZRC250
* * * * * * * * * * * * * *
Small outline SOT23 package TO92 style packages No stabilising capacitor required Low knee current, 15A typical Typical TC 30ppm/C Typical slope resistance 0.4 3, 2 and 1% tolerance Industrial temperature range Operating current 20A to 5mA Transient response, stable in less than 10s Optional extended current range
APPLICATIONS Battery powered and portable equipment. Instrumentation. Test equipment.
SCHEMATIC DIAGRAM
V
R
G nd
4-247
ZRC250
ABSOLUTE MAXIMUM RATING
Reverse Current Forward Current Operating Temperature Storage Temperature 25mA 25mA -40 to 85C -55 to 125C Power Dissipation (Tamb=25C) SOT23 330mW E-line, 3 pin (TO92) 500mW
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated) Tamb=25C
SYMBOL PARAMETER CONDITIONS MIN VR Reverse Breakdown Voltage IR=150A 2.475 2.45 2.425 LIMITS TYP MAX 2.5 2.5 2.5 13 0.02 30 IR(min) to IR(max) 0.4 IR = 1mA f = 100Hz IAC= 0.1 IR IR = 150A f = 10Hz to 10kHz
40
TOL%
UNITS
2.525 2.55 2.575 20 5 90
1 2 3
V
IMIN IR TC
Minimum Operating Current Recommended Operating Current Average Reverse Breakdown Voltage Temp. Co. Slope Resistance Reverse Dynamic Impedance
A mA ppm/C
RS ZR
1 0.8

0.3
EN
Wideband Noise Voltage
60 V(rms)
TC =
(VR(max)-VR(min)) x 1000000 VR x (T(max)-T(min))
Reverse Current (A)
30
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)
20
10
TA=25C
0 0
1.0
2.0
3.0
Reverse Voltage (V)
Reverse Characteristics
4-248
ZRC250
TYPICAL CHARACTERISTICS
1.4 2.51 1.2
IR=150A to 5mA
Reference voltage (V)
1 10 100 2.50
Forward Voltage (V)
1.0
0.8
2.49
0.6
0.4
2.48
0.2 2.47
0.001
0.01
0.1
-40
-20
0
20
40
60
80
Forward Current (mA)
Temperature (C)
Forward Characteristics
1000 1.4 1.2
Temperature Drift
IR=150A
Slope resistance ()
85C 25C -40C
100
Slope resistance ()
1.0
0.8
10
0.6
IR=5mA
1
0.4
0.2
IR=1mA
0.1 1 10 100 10 100 1K 10K 100K
Reference Current (mA)
Frequency (kHz)
Slope Resistance v Current
Slope Resistance v Frequency
VIN (V)
10
10
VIN (V)
0
0
IR=5mA
3
IR=5mA
2
IR=150A
1
VR (V)
2
VR (V)
1 0
IR=150A
0
0
4
8
12
16
0
4
8
12
16
Time (s)
Time (s)
Transient Response - Single pulse
Transient Response - Repetitive Test
4-249
ZRC250
CONNECTION DIAGRAMS
E-Line, 3 pin Package Suffix - A SOT23 Package Suffix - F
Bottom View - Pin 1 floating or connected to pin 3
Top View - Pin 1 floating or connected to pin 2
4-250
ZRC250
ORDERING INFORMATION
Part No Tol% Package E-Line * E-Line * E-Line * SOT23 SOT23 SOT23 Partmark
ZRC250A03 ZRC250A02 ZRC250A01 ZRC250F03 ZRC250F02 ZRC250F01 * E-Line 3 pin
3 2 1 3 2 1
ZRC25003 ZRC25002 ZRC25001 25G 25H 25J
4-251

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