PRECISION 2.5 VOLT MICROPOWER
VOLTAGE REFERENCE
ISSUE 5 – FEBRUARY 1998
DEVICE DESCRIPTION
The ZR285 uses a bandgap circuit
de si g n t o a c h i e v e a p r e c i s i on
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 ZR285 design provides a stable
voltage without an external capacitor
and is stable with capacitive loads. The
ZR285 is recommended for operation
between 20µA and 20mA and so is
ideally suited to low power and battery
powered applications.
Excellent performance is maintained to
an absolute maximum of 30mA,
however the rugged design and 20 volt
processing allows the reference to
wi t hst an d transi ent effects and
currents up to 200mA. Superior
switching capability allows the device
to reach stable operating conditions in
only a few microseconds.
ZR285-2.5
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
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 20mA
APPLICATIONS
Battery powered and portable equipment.
Metering and measurement systems.
Instrumentation.
Test equipment.
Data acquisition systems.
Precision power supplies.
SCHEMATIC DIAGRAM
V
R
G
nd
4-165
ZR285-2.5
ABSOLUTE MAXIMUM RATING
Reverse Current
Forward Current
Operating Temperature
Storage Temperature
30mA
25mA
-40 to 85°C
-55 to 125°C
Power Dissipation (T
amb
=25°C)
SO8
625mW
SOT23
330mW
E-Line,2 Pin(TO92)
500mW
E-Line,3 Pin(TO92)
500mW
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 1
2.55
2
2.575 3
20
20
30
I
R
= 1mA to
20mA
I
R
= 1mA
f = 100Hz
I
AC
= 0.1 I
R
I
R
= 150µA
f = 10Hz to
10kHz
90
V
TOL.
%
UNITS
2.475 2.5
2.45
2.5
2.425 2.5
13
0.02
I
MIN
I
R
T
C
†
R
S
§
Z
R
Minimum Operating Current
Recommended Operating
Current
Average Reverse Breakdown
Voltage Temp. Co.
Slope Resistance
Reverse Dynamic Impedance
µA
mA
ppm/°C
Ω
Ω
0.4 1
0.3 0.8
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)
40
Note: V
R(max)
- V
R(min)
is the maximum
deviation in reference voltage measured
over the full operating temperature
range.
30
20
§
R
S
=
V
R
Change
(
I
R
(
min
)
to I
R
(
max
))
I
R
(
max
) −
I
R
(
min
)
10
T
A
=25°C
0
0
1.0
2.0
3.0
Reverse Voltage (V)
Reverse Characteristics
4-166
ZR285-2.5
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
SOT23 Package Suffix – F
SO8 Package Suffix – N8
Top View –
Pin 1 floating or connected to pin 2
Top View
ORDERING INFORMATION
Part No
Tol% Package
Partmark
Part No
Tol% Package
Partmark
ZR285F03
ZR285F02
ZR285F01
ZR285N803
ZR285N802
ZR285N801
ZR285R03
ZR285R02
3
2
1
3
2
1
3
2
SOT23
SOT23
SOT23
SO8
SO8
SO8
E-Line *
E-Line *
28A
28B
28C
ZR285803
ZR285802
ZR285801
ZR28503
ZR28502
ZR285R01
ZR285Y03
ZR285Y02
ZR285Y01
1
3
2
1
E-Line *
E-Line †
E-Line †
E-Line †
ZR28501
ZR28503
ZR28502
ZR28501
* E-Line 3 pin Reversed
† E-Line 2 pin
4-168
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