PRECISION 2.5 VOLT MICROPOWER
VOLTAGE REFERENCE
ISSUE 5 – FEBRUARY 1998
ZR285-2.5
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 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
withstand transient effects and
currents up to 200mA. Superior
switching capability allows the device
to reach stable operating conditions in
only a few microseconds.
SCHEMATIC DIAGRAM
FEATURES
Small outline SOT23 and SO8 packages
•
TO92 style packages
•
No stabilising capacitor required
•
Low knee current, 15µA typical
•
Typical TC 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.
•
V
G
R
nd
4-165
ZR285-2.5
ABSOLUTE MAXIMUM RATING
Reverse Current 30mA
Forward Current 25mA
Operating Temperature -40 to 85°C
Storage Temperature -55 to 125°C
Power Dissipation (T
SO8 625mW
SOT23 330mW
E-Line,2 Pin(TO92) 500mW
E-Line,3 Pin(TO92) 500mW
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) T
SYMBOL PARAMETER
V
I
I
R
MIN
R
Reverse Breakdown Voltage
Minimum Operating Current 13 20
Recommended Operating
Current
T
† Average Reverse Breakdown
C
Voltage Temp. Co. I
R
§ Slope Resistance 0.4 1
S
Z
R
E
N
Reverse Dynamic Impedance IR =1mA
Wideband Noise Voltage
CONDITIONS LIMITS TOL.
=150µA
I
R
= 1mA to
R
20mA
f = 100Hz
I
=0.1 I
AC
R
=150µA
I
R
f = 10Hz to
10kHz
=25°C
amb
MIN TYP MAX
2.475
2.45
2.425
0.02 20 mA
=25°C)
amb
UNITS
%
2.5
2.525
1
V
2.5
2.55
2
2.5
2.575
3
µA
30 90 ppm/°C
Ω
0.3 0.8
Ω
60
µV (rms)
V
−
V
†
T
Note: V
=
C
R(max)
(
R(max
V
- V
)
x (
R
R(min)
) x 1000000
R(min
)
T
−
T
(
max
)
)
(
min
)
is the maximum
deviation in reference voltage measured
over the full operating temperature
range.
V
Change
(
I
(
§
R
R
=
S
I
min) to I
R
(
max
) −
R
(
max
R
I
(
min
)
R
40
30
)
A
µ
nt (
20
e
r
ur
C
e
))
ers
10
ev
R
0
0
TA=25°C
1.0 2.0 3.0
Reverse Voltage (V)
Reverse Characteristics
4-166
1.4
1.2
1.0
(V)
ge
0.8
a
t
ol
0.6
ard V
0.4
orw
F
0.2
1.4
1.2
)
Ω
(
1.0
nce
0.8
a
t
s
0.6
ope resi
l
0.4
S
0.2
0.001
0.01 0.1
Forward Current (mA)
Forward Characteristics
85°C
25°C
-40°C
TYPICAL CHARACTERISTICS
2.51
(V)
2.50
tage
ol
2.49
erence v
2.48
ef
R
2.47
1
100
10
-40
-20 0 20
Temperature Drift
1000
100
)
Ω
(
nce
a
t
10
s
ope resi
l
1
S
IR=1mA
ZR285-2.5
IR=150µA to 5mA
40
Temperature (°C)
IR=150µA
60
IR=5mA
80
0.1
110100
Reference Current (mA)
Slope Resistance v Current
10
V)
(
N
I
0
V
≈
3
2
V)
(
R
1
V
0
04
IR=5mA
IR=150µA
8
Time (µs)
≈
12
16
10 100 1K
Frequency (kHz)
Slope Resistance v Frequency
10
V)
(
N
I
V
0
2
1
(V)
0
R
V
IR=5mA
IR=150µA
04
8
Time (µs)
12
Transient Response - Single pulse Transient Response - Repetitive Test
4-167
100K
10K
16
ZR285-2.5
CONNECTION DIAGRAMS
E-Line, 2 pin Package Suffix – Y
Bottom View
SOT23 Package Suffix – F
Top View –
Pin 1 floating or connected to pin 2
ORDERING INFORMATION
E-Line, 3 pin,Rev Package Suffix – R
Bottom View –
Pin 3 floating or connected to pin 1
SO8 Package Suffix – N8
Top View
Part No Tol% Package Partmark
ZR285F03 3 SOT23 28A
ZR285F02 2 SOT23 28B
ZR285F01 1 SOT23 28C
ZR285N803 3 SO8 ZR285803
ZR285N802 2 SO8 ZR285802
ZR285N801 1 SO8 ZR285801
ZR285R03 3 E-Line * ZR28503
ZR285R02 2 E-Line * ZR28502
Part No Tol% Package Partmark
ZR285R01 1 E-Line * ZR28501
ZR285Y03 3 E-Line † ZR28503
ZR285Y02 2 E-Line † ZR28502
ZR285Y01 1 E-Line † ZR28501
* E-Line 3 pin Reversed
† E-Line 2 pin
4-168
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