Diodes ZR285 User Manual
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Diodes Incorporated
ZR285
PRECISION 2.5V MICROPOWER VOLTAGE REFERNCE
Description
The ZR285 uses a bandgap circuit design to achieve a
precision micropower voltage reference of 2.5 volts. The
device is available in a small outline s urface mount package,
ideal for applications where space saving is important.
The ZR285 design provides a stable voltage without an
external capacitor and is stable with capacitive loads. The
ZR285 is recommended for operation between 20A 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 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 style package
• No stabilizing capacitor required
• Low knee current, 15A typical
• Typical T
• Typical slope resistance 0.4
• ± 2% tolerance
• Industrial temperature range
• Operating current 20μA to 20mA
30ppm/°C
C
Pin Assignment
(Top View)
Pin 1 floating or connected to pin 2
Typical Application Circuit
Applications
• Battery powered and portable equipment
• Metering and measurement systems
• Instrumentation
• Test equipment
• Data acquisition systems
• Precision power supplies
ZR285
Document number: DS32168 Rev. 8 - 2
1 of 5
www.diodes.com
© Diodes Incorporated
May 2010
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Diodes Incorporated
Absolute Maximum Ratings (Voltages to GND Unless Otherwise Stated)
Parameter Rating Unit
Reverse Current 30 mA
Forward Current 25 mA
Operating Temperature -40 to 85 °C
Storage Temperature -55 to 150 °C
Power Dissipation (T
SOT23
AMB
= 25°C)
330 mW
Product Line o
ZR285
Electrical Characteristics (Test conditions: T
= 25°C, unless otherwise specified.)
amb
Symbol Parameter Condition Min. Typ. Max. Tol. (%) Unit
VR
I
MIN
IR
T
R
ZR
EN
Reverse breakdown voltage
Minimum operating current 13 20
IR = 150µA
Recommended operating current 0.02 20
(*)
C
(†)
S
Average reverse breakdown voltage
temperature coefficient
Slope resistance 0.4 1
Reverse dynamic impedance
Wideband noise voltage
IR = 1mA to
20mA
= 1mA
I
R
f = 100Hz
I
= 0.1IR
AC
= 150µA
I
R
f = 10Hz to
2.45 2.5 2.55 2 V
30 90
µA
mA
ppm/°C
0.3 0.8
60
µV(rms)
10kHz
Notes:
(V
– V
(*)
TC =
Note: V
voltage measured over the full operating temperature range.
(†)
RS =
.
R(MAX)
R(MAX
- V
V
Change (
R
V
R
R(MIN)
I
R(MAX
x (T
) x 1000000
R(MIN
– T
R(MIN
to I
MIN
R(MAX
)
)
MAX
is the maximum deviation in reference
IR(MIN
– I
)
ZR285
Document number: DS32168 Rev. 8 - 2
2 of 5
www.diodes.com
May 2010
© Diodes Incorporated
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