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
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
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
5°C
C
=2
°
T
A
-40
A
=
T
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
TYPICAL CHARACTERISTICS
1.4
2.53
I
R
=150µA 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
I
R
=150µA
Slope resistance (
Ω
)
Slope resistance (
Ω
)
1.0
100
10
I
R
=1mA
0.5
T
A
=-40°C
T
A
=25°C
T
A
=85°C
0
0.1
1
10
I
R
=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
V
R
- (V)
INPUT
50K
OUTPUT
V
R
- (V)
2.0
1.0
0
10
2.0
1.0
0
10
INPUT
1K5
OUTPUT
V
IN
- (V)
V
IN
- (V)
0
0
1
2
3
4
0
0
0.1
0.2
0.3
0.4
Time (µs)
Time (µs)
Transient Response (I
R
=150µA)
µ
Transient Response (I
R
=5mA)
4-234
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
ZRA250
ORDERING INFORMATION
Part No
ZRA250A03
ZRA250A02
ZRA250A01
ZRA250A005
ZRA250F03
ZRA250F02
ZRA250F01
ZRA250F005
ZRA250N803
ZRA250N802
ZRA250N801
Tol% Package
3
2
1
0.5
3
2
1
0.5
3
2
1
E-Line
•
E-Line
•
E-Line
•
E-Line
•
SOT23
SOT23
SOT23
SOT23
SO8
SO8
SO8
SO8
Partmark
ZRA25003
ZRA25002
ZRA25001
ZRA250005
25A
25C
25B
25Y
ZRA25003
ZRA25002
ZRA25001
ZRA250005
Part No
ZRA250R03
ZRA250R02
ZRA250R01
ZRA250R005
ZRA250Y03
ZRA250Y02
ZRA250Y01
ZRA250Y005
Tol% Package
3
2
1
0.5
3
2
1
0.5
E-Line *
E-Line *
E-Line *
E-Line *
E-Line †
E-Line †
E-Line †
E-Line †
Partmark
ZRA250R3
ZRA250R2
ZRA250R1
ZRA250R05
ZRA25003
ZRA25002
ZRA25001
ZRA250005
* E-Line 3 pin Reversed
† E-Line 2 pin
•
E-Line 3 pin
ZRA250N8005 0.5
Note:
3%, 2% and 1% tolerance devices are
not recommended for new designs.
Refer to ZRC250
4-236
