DEVICE DESCRIPTION
The ZRC500 uses a bandgap circuit design to
achieve a precision micropower voltage
reference of 5.0 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 ZRC500 design provides a stable voltage
without an external capacitor and is stable
with capacitive loads. The ZRC500 is
recommended for operation between 25
A
and 5mA and so is ideally suited to low
power and battery powered applications.
Excellent performance is maintained to an
absolute maximum of 25mA, 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, SO8 and TO92
style packages
No stabilising capacitor required
Low knee current, 19
A typical
Typical T
C
30ppm/C
Typical slope resistance 0.4
3%, 2% and 1% tolerance
Industrial temperature range
Operating current 25
A to 5mA
Transient response, stable in less than
10
s
Optional extended current range
APPLICATIONS
Battery powered and portable
equipment.
Instrumentation.
Test equipment.
Metering and measurement systems.
V
R
G
nd
PRECISION 5.0 VOLT LOW KNEE CURRENT
VOLTAGE REFERENCE
ISSUE 3 - MARCH 1998
ZRC500
SCHEMATIC DIAGRAM
4-262
ABSOLUTE MAXIMUM RATING
Reverse Current
25mA
Forward Current
25mA
Operating Temperature
-40 to 85C
Storage Temperature
-55 to 125C
Power Dissipation (T
amb
=25C)
SOT23
330mW
E-Line, 3 pin (TO92)
500mW
E-Line, 2 pin (TO92)
500mW
SO8
625mW
ELECTRICAL CHARACTERISTICS
TEST CONDITIONS (Unless otherwise stated) T
amb
=25C
SYMBOL PARAMETER
CONDITIONS
LIMITS
TOL.
%
UNITS
MIN
TYP
MAX
V
R
Reverse Breakdown Voltage
I
R
=150
A
4.95
4.9
4.85
5.0
5.0
5.0
5.05
5.1
5.15
1
2
3
V
I
MIN
Minimum Operating Current
19
25
A
I
R
Recommended Operating
Current
0.025
5
mA
T
C
Average Reverse Breakdown
Voltage Temp. Co.
I
R(min)
to
I
R(max)
30
90
ppm/C
R
S
Slope Resistance
0.4
2
Z
R
Reverse Dynamic Impedance
I
R
= 1mA
f = 100Hz
I
AC
= 0.1 I
R
0.3
0.8
E
N
Wideband Noise Voltage
I
R
= 150
A
f = 10Hz to
10kHz
105
V(rms)
ZRC500
R
e
v
e
r
s
e
Cur
r
e
nt
(uA
)
0
20
40
60
Reverse Characteristics
0
Reverse Voltage (V)
2
6
85 C
25 C
-40 C
4
T
C
=
(
V
R
(
max
)
-
V
R
(
min
)
)
x 1000000
V
R
x
(
T
(
max
)
-
T
(
min
)
)
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
)
4-263
-40
-20
0
20
40
60
4.96
4.98
5.00
5.02
5.04
4.94
Reference V
o
l
tage
(
V
)
Temperature Drift
Temperature (C)
F
o
rward
V
o
ltag
e (V)
0.8
0.4
0.6
1.0
1.2
1.4
Forward Characteristics
0.1
1
Forward Current (mA)
10
100
1000
1.6
2
Sl
ope Resistance (Ohm
s)
0
1
3
Slope Resistance vs. Current
0.1
Reference Current (mA)
1
10
T =25C
A
0
V
i
n
(V)
0
10
V
R
(V
)
2
4
6
Transient Response (Single Pulse)
Time (ms)
1
2
3
5mA
150A
10
Slo
pe Resistance (Ohm
s)
0.1
1
100
1000
Slope Resistance vs. Frequency
10
Frequency (Hz)
100
1K
10K
100K
I
ref
=5mA
5.06
5.08
80
100
T =-40C
A
T =85C
A
I
ref
=1mA
I
ref
=150A
0
0
V
i
n
(V)
10
V
R
(V
)
2
0
4
6
Transient Response (Repetitive Pulse)
Time (s)
0
2
4
6
150A
5mA
33K
150
A
1K
5mA
V
IN
33K
150
A
1K
5mA
V
IN
33K
150
A
1K
5mA
V
IN
ZRC500
TYPICAL CHARACTERISTICS
4-264
SO8 Package Suffix N8
Top
View
E-Line, 3 pin,Rev Package Suffix R
Bottom View
Pin 3 floating or connected to pin 1
E-Line, 2 pin Package Suffix Y
Bottom
View
CONNECTION DIAGRAMS
E-Line, 3 pin Package Suffix A
Bottom
View
Pin 1 floating or connected to pin 3
SOT23 Package
Suffix F
Top
View
Pin 1 floating or connected to pin 2
ZRC500
4-265
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