PRECISION 2.5 VOLT MICROPOWER
VOLTAGE REFERENCE
ISSUE
5
-
JANUARY 2006
ZRA250
DEVICE DESCRIPTION
The ZRA250 uses a bandgap circuit design
to achieve a precision micropower voltage
reference of 2.5 volts. The device is available
in small outline surface mount packages,
ideal for applications where space saving is
important.
The ZRA250 design provides a stable voltage
without an external capacitor and is stable
with capacitive loads. The ZRA250 is
recommended for operation between 50µA
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.
FEATURES
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Small outline SOT23, SO8 and TO92
style packages.
No stabilising capacitor required
Typical T
C
30ppm/°C
Typical slope resistance 0.4Ω
±
3%, 2%,1% and 0.5% tolerance
Industrial temperature range
Operating current 50µA to 5mA
Transient response, stable in less than
10µs
Optional extended current range
APPLICATIONS
Battery powered and portable
equipment.
Metering and measurement systems.
Instrumentation.
Test equipment.
Data acquisition systems.
Precision power supplies.
SCHEMATIC DIAGRAM
V
R
Note:
3%, 2% and 1% tolerance devices are
not recommended for new designs.
Refer to ZRC250
G
nd
4-232
ZRA250
ABSOLUTE MAXIMUM RATING
Reverse Current
Forward Current
Operating Temperature
Storage Temperature
25mA
25mA
-40 to 85°C
-55 to 125°C
Power Dissipation (T
amb
=25°C)
SOT23
330mW
E-Line, 3 pin (TO92)
500mW
E-Line, 2 pin (TO92)
500mW
SO8
625mW
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) T
amb
=25°C
SYMBOL PARAMETER
CONDITIONS
MIN
V
R
Reverse Breakdown Voltage I
R
=150µA
2.4875
2.475
2.45
2.425
LIMITS
TYP
2.5
2.5
2.5
2.5
25
0.05
30
0.4
0.3
MAX
2.5125
2.525
2.55
2.575
50
5
90
2
0.8
0.5
1
2
3
V
TOL.
%
UNITS
I
MIN
I
R
T
C
†
R
S
§
Z
R
Minimum Operating Current
Recommended Operating
Current
Average Reverse Breakdown
Voltage Temp. Co.
I
R(min)
to
I
R(max)
Slope Resistance
Reverse Dynamic Impedance I
R
= 1mA
f = 100Hz
I
AC
= 0.1 I
R
Wideband Noise Voltage
I
R
= 150µA
f = 10Hz to
10kHz
µA
mA
ppm/°C
Ω
Ω
E
N
45
µV(rms)
Reverse Current (
µ
A)
†
(V
R(max)
−V
R(min)
)
x
1000000
T
C
=
V
R
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
T
A
5°C
=8
°C
25
°C
A
=
0
T
=-4
T
A
Note: V
R(max)
- V
R(min)
is the maximum
deviation in reference voltage measured
over the full operating temperature
range.
§
R
S
=
V
R
Change
(I
R
(min)
to I
R
(max))
I
R
(max) −
I
R
(min)
Reverse Voltage (V)
Reverse Characteristics
4-233
ZRA250
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
E-Line, 3 pin Package Suffix – A
SO8 Package Suffix – N8
Bottom View –
Pin 1 floating or connected to pin 3
Top View
SOT23 Package Suffix – F
Top View –
Pin 1 floating or connected to pin 2
4-235
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