ZR285-2.5
PRECISION 2.5 VOLT MICROPOWER VOLTAGE REFERENCE
DEVICE 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 surface 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
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 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 package
•
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
SCHEMATIC DIAGRAM
•
Precision power supplies
ISSUE 7 - NOVEMBER 2004
1
SEMICONDUCTORS
ZR285-2.5
ABSOLUTE MAXIMUM RATING
Reverse current
Forward current
Operating temperature
Storage temperature
30mA
25mA
-40 to 85°C
-55 to 150°C
Power dissipation (T
amb
=25°C)
SOT23
330mW
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) T
amb
=25°C
SYMBOL
PARAMETER
CONDITION
MIN
V
R
Reverse breakdown voltage
I =150µA
R
LIMITS
TYP
2.5
2.5
2.5
13
0.02
30
0.4
0.3
MAX
2.525
2.55
2.575
20
20
90
1
0.8
TOL. % UNITS
2.475
2.45
2.425
1
2
3
V
I
MIN
I
R
T
C (1)
R
S (2)
Z
R
Minimum operating current
Recommended operating current
Average reverse breakdown voltage
temp. co.
I
R
= 1mA to
20mA
Slope resistance
Reverse dynamic impedance
I
R
=1mA
f =100Hz
I
AC
=0.1 I
R
I
R
= 150µA
f = 10Hz to
10kHz
µA
mA
ppm/°C
Ω
Ω
E
N
Wideband noise voltage
60
µV
(rms)
NOTES:
(1)
T
C
=
(
V
R
(
max
)
−
V
R
(
min
)
)
x
1000000
V
R
x
(
T
(
max
)
−
T
(
min
)
)
Note: VR(max) - VR(min) is the maximum deviation in reference voltage
measured over the full operating temperature range.
(2)
R
S
=
V
R
Change
(
I
R
(
min
)
to I
R
(max)
)
I
R
(max )
−
I
R
(
min
)
ISSUE 7 - NOVEMBER 2004
SEMICONDUCTORS
2
ZR285-2.5
TYPICAL CHARACTERISTICS
ISSUE 7 - NOVEMBER 2004
3
SEMICONDUCTORS
ZR285-2.5
PACKAGE OUTLINE
CONNECTION DIAGRAM
SOT23 Package Suffix – F
Top view - Pin 1 floating or connected to pin 2
ORDERING INFORMATION
Part No
Tol%
3
2
1
Package
SOT23
SOT23
SOT23
Partmark
28A
28B
28C
C o n tr o l l i ng d i m en s io ns a r e in mi ll im e t e r s.
Approximate conversions are given in inches
ZR285F03TA
ZR285F02TA
ZR285F01TA
7” reels of 3,000 units
PACKAGE DIMENSIONS
Millimeters
DIM
A
B
C
D
F
G
0.37
0.085
Min
2.67
1.20
Max
3.05
1.40
1.10
0.53
0.15
0.015
0.0034
Inches
Min
0.105
0.047
Max
0.120
0.055
0.043
0.021
0.0059
DIM
H
K
L
M
N
Millimeters
Min
0.33
0.01
2.10
0.45
Max
0.51
0.10
2.50
0.64
Inches
Max
0.013
0.0004
0.083
0.018
Max
0.020
0.004
0.0985
0.025
0.95 NOM
0.0375 NOM
1.90 NOM
0.075 NOM
© Zetex Semiconductors plc 2004
Europe
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, NY 11788
USA
Telephone: (1) 631 360 2222
Fax: (1) 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
Corporate Headquarters
Zetex Semiconductors plc
Lansdowne Road, Chadderton
Oldham, OL9 9TY
United Kingdom
Telephone (44) 161 622 4444
Fax: (44) 161 622 4446
hq@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
ISSUE 7 - NOVEMBER 2004
SEMICONDUCTORS
4
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