PRECISION 2.5 VOLT MICROPOWER
VOLTAGE REFERENCE
ISSUE 6 – JANUARY 2003
DEVICE DESCRIPTION
The ZR285 uses a bandgap circuit
d e s ig n t o a c hi e v e a p re c i s io n
micropower voltage reference of
2.5 volts. The device is available in a
small outline surface mount package,
ideal for applications where space
s a v i ng i s im po rta n t, a s w el l a s
packages
fo r
t hr o ug h
ho l e
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 20
µ
A and 20mA and so is
ideally suited to low power and battery
powered applications.
Excellent performance is maintained to
an a bsolute maximum of 30mA,
however the rugged design and 20 volt
processing allows the reference to
w i th s t a nd t ra n s ie n t e ffe c ts an d
c urren ts up to 2 00mA. Supe rior
switching capability allows the device
to reach stable operating conditions in
only a few microseconds.
ZR285-2.5
FEATURES
•
•
•
•
•
•
•
•
•
Small outline SOT23 package
TO92 style packages
No stabilising capacitor required
Low knee current, 15
µ
A typical
Typical T
C
30ppm/°C
Typical slope resistance 0.4
Ω
±
3%, 2% and 1% tolerance
Industrial temperature range
Operating current 20
µ
A 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)
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
=150
µ
A
2.475
2.45
2.425
LIMITS
TYP MAX
2.5
2.5
2.5
13
0.02
30
I
R
= 1mA to
20mA
I
R
= 1mA
f = 100Hz
I
AC
= 0.1 I
R
I
R
= 150
µ
A
f = 10Hz to
10kHz
0.4
0.3
2.525 1
2.55
2
2.575 3
20
20
90
1
0.8
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.
Slope Resistance
Reverse Dynamic Impedance
µ
A
mA
ppm/°C
Ω
Ω
E
N
Wideband Noise Voltage
60
µ
V (rms)
†
T
C
=
(
V
R(max)
−
V
R(min)
)
x
1000000
V
R
x
(
T
(max)
−
T
(min)
)
Reverse Current (
µ
A)
40
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
)
30
20
10
T
A
=25°C
0
0
1.0
2.0
3.0
Reverse Voltage (V)
Reverse Characteristics
4-166
ZR285-2.5
TYPICAL CHARACTERISTICS
1.4
2.51
1.2
I
R
=150µA to 5mA
Reference voltage (V)
0.001
1
10
100
2.50
Forward Voltage (V)
1.0
0.8
2.49
0.6
0.4
2.48
0.2
2.47
0.01
0.1
-40
-20
0
20
40
60
80
Forward Current (mA)
Temperature (°C)
Forward Characteristics
1000
1.4
1.2
Temperature Drift
Slope resistance (
Ω
)
1.0
0.8
Slope resistance (
Ω
)
85°C
25°C
-40°C
I
R
=150µA
100
10
0.6
I
R
=5mA
1
0.4
0.2
I
R
=1mA
0.1
1
10
100
10
100
1K
10K
100K
Reference Current (mA)
Frequency (kHz)
Slope Resistance v Current
Slope Resistance v Frequency
V
IN
(V)
10
10
V
IN
(V)
0
0
I
R
=5mA
≈
3
≈
I
R
=5mA
2
I
R
=150µA
1
V
R
(V)
2
0
V
R
(V)
1
I
R
=150µA
0
0
4
8
12
16
0
4
8
12
16
Time (µs)
Time (µs)
Transient Response - Single pulse
Transient Response - Repetitive Test
4-167
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
Top View –
Pin 1 floating or connected to pin 2
ORDERING INFORMATION
Part No
Tol% Package
Partmark
Part No
Tol% Package
Partmark
ZR285F03
ZR285F02
ZR285F01
ZR285R03
ZR285R02
3
2
1
3
2
SOT23
SOT23
SOT23
E-Line *
E-Line *
28A
28B
28C
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
PRODUCT AND INFORMATION DISCLAIMER
This publication is issued to provide outline information only which (unless agreed by the
Company in writing) may not be used, applied or reproduced for any purposes or form part of any
order or contract or be regarded as representation relating to the products or services concerned.
The company reserves the right to alter without notice the specification, design, price or
conditions of supply of any product or service.
Some changes to earlier published data may have been made, data presented in this hand book
supersedes all previous specifications. The information contained in this publication has been
carefully checked and is considered to be accurate, but no responsibility is assumed for any
inaccuracies.
Zetex makes no warranty, representation or guarantee regarding the suitability of the products
and circuits in this publication for any given purpose; nor does Zetex assume any liability arising
from the use or application of any of these products or circuits and specifically disclaims any and
all consequential and incidental damages.
Zetex products are specifically not authorised for use as critical components in life support
devices or systems without the express written approval of the Managing Director of Zetex plc.
As used herein -
a. Life support devices or systems are devices or systems which
(1) are intended to implant into the body, or
(2) support or sustain life and whose failure to perform when properly used in accordance
with instructions for use provided in the labelling can be reasonably expected to result in
significant injury to the user.
b. A critical component is any component in a life support device or system whose failure to
perform can be reasonably expected to cause the failure of the life support device or to affect its
safety or effectiveness.
E. & O. E.
”all rights reserved“
© Zetex plc 2002
Europe
Zetex plc
Fields New Road
Chadderton
Oldham, OL9 8NP
United Kingdom
Telephone (44) 161 622 4422
Fax: (44) 161 622 4420
uk.sales@zetex.com
Zetex GmbH
Streitfeldstraße 19
D-81673 München
Germany
Telefon: (49) 89 45 49 49 0
Fax: (49) 89 45 49 49 49
europe.sales@zetex.com
Americas
Zetex Inc
700 Veterans Memorial Hwy
Hauppauge, NY11788
USA
Telephone: (631) 360 2222
Fax: (631) 360 8222
usa.sales@zetex.com
Asia Pacific
Zetex (Asia) Ltd
3701-04 Metroplaza, Tower 1
Hing Fong Road
Kwai Fong
Hong Kong
Telephone: (852) 26100 611
Fax: (852) 24250 494
asia.sales@zetex.com
These offices are supported by agents and distributors in major countries world-wide.
This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or reproduced
for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. The Company
reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service.
For the latest product information, log on to
www.zetex.com
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