PRECISION 2.5 VOLT LOW KNEE CURRENT
VOLTAGE REFERENCE
ISSUE 3 - MARCH 1998
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 small outline surface mount packages,
ideal for applications where space saving is
important, as well as packages 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 20µA
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
ZRC250
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Small outline SOT23 and SO8 packages
TO92 style packages
No stabilising capacitor required
Low knee current, 15µA typical
Typical T
C
30ppm/°C
Typical slope resistance 0.4Ω
±
3, 2 and 1% tolerance
Industrial temperature range
Operating current 20µA to 5mA
Transient response, stable in less than
10µs
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 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
LIMITS
TYP MAX
2.525
2.55
2.575
20
5
30
I
R(min)
to
I
R(max)
0.4
I
R
= 1mA
f = 100Hz
I
AC
= 0.1 I
R
I
R
= 150µA
f = 10Hz to
10kHz
40
TOL%
UNITS
2.475 2.5
2.45
2.5
2.425 2.5
13
0.02
1
2
3
V
I
MIN
I
R
T
C
†
Minimum Operating Current
Recommended Operating
Current
Average Reverse
Breakdown Voltage Temp.
Co.
Slope Resistance
Reverse Dynamic Impedance
µA
mA
ppm/°C
90
R
S
§
Z
R
1
0.8
Ω
Ω
0.3
E
N
Wideband Noise Voltage
60
µV(rms)
†
T
C
=
(
V
R
(
max
)
−
V
R
(
min
)
)
x
1000000
V
R
x
(
T
(
max
)
−
T
(
min
)
)
Reverse Current (µA)
30
Note: V
R(max)
- V
R(min)
is the maximum
deviation in reference voltage measured
over the full operating temperature
range.
20
§
V
R
Change
(
I
R
(
min
)
to I
R
(
max
)
)
R
S
=
I
R
(
max
)
−
I
R
(
min
)
10
T
A
=25°C
0
0
1.0
2.0
3.0
Reverse Voltage (V)
Reverse Characteristics
4-248
ZRC250
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
4-250
Microcontroller MCU
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