5.0V LOW POWER
PRECISION REFERENCE SOURCE
ISSUE 1 - OCTOBER 1995
ZRT050
DEVICE DESCRIPTION
The ZRT050 is a monolithic integrated circuit
providing a precise stable reference voltage
of 4.9V at 500µA.
The circuit features a knee current of 150µA
and operation over a wide range of
temperatures and currents.
The ZRT050 is available in a 3-pin metal can
package for through hole applications as
well as SOT223 and SO8 packages for
surface mount applications. Each package
option offers a trim facility whereby the
output voltage can be adjusted as shown in
F i g . 1. Thi s f a ci l i t y i s u sed w he n
compensating for system errors or setting
the reference output to a particular value.
When the trim facility is not used, the pin
should be left open circuit.
FEATURES
•
•
•
•
•
•
•
•
•
Trimmable output
Excellent temperature stability
Low output noise figure
Available in two temperature ranges
1 and 2% initial voltage tolerance
versions available
No external stabilising capacitor
required in most cases
Low slope resistance
TO18 package
SOT223 and SO8 small outline
packages
SCHEMATIC DIAGRAM
R
V
CC
V
R
R=V
CC
-V
R
I
R
R
T
=100k
(Optional trim facility)
G
nd
G
nd
Figure 1:
This circuit will allow the reference to be
trimmed over a wide range. The device is
specified over a 5% trim range.
4-287
ZRT050
ABSOLUTE MAXIMUM RATING
Reverse Current
Operating Temperature
A grade
C grade
Storage Temperature
TO18
SO8, SOT223
60mA ø
-55°C to 125°C
0°C to 70°C
-55 °C to 175 °C
-55 °C to 125 °C
Power Dissipation (T
amb
=25°C)
TO18
300mW
SO8
625mW
SOT223
2W
ø Above 25°C this figure should be linearly
derated to 12mA at 125°C
TEMPERATURE DEPENDENT ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER
INITIAL
GRADE A
VOLTAGE
-55°C TO 125°C
TOLERANCE
TYP
MAX
%
1&2
13.5
45.0
GRADE C
0°C TO 70°C
TYP
5.4
MAX
17.2
mV
UNITS
V
R
Output voltage
change over relevant
temperature range
(See note (a))
Output voltage
temperature
coefficient (See
note (b))
T
C
V
R
1&2
15.0
50.0
15.0
50.0
ppm/°C
ELECTRICAL CHARACTERISTICS
( at T
amb
=25°C and trim pin unless otherwise stated)
SYMBOL PARAMETER
V
R
Output voltage
1% tolerance (A1,C1)
2% tolerance (C2)
Output voltage adjustment range
MIN.
4.85
4.80
TYP. MAX. UNITS
4.90
4.90
5
2.5
0.15
100
0.3
50
1.25
2.0
60
4.95
5.00
V
%
ppm/°C/%
mA
µs
µV
Ω
See note (c)
R
L
=1kΩ
Peak to peak
measurement
I
R
=
0.5mA to 5mA
See note (d)
COMMENTS
I
R
=500µA
R
T
=100kΩ
V
TRIM
T
C
V
TRIM
Change in TCV
R
with output
adjustment
I
R
t
on
t
off
e
np-p
R
S
Operating current range
Turn-on time
Turn-off time
Output voltage noise
(over the range 0.1 to 10Hz)
Slope resistance
4-288
ZRT050
TYPICAL CHARACTERISTICS
NOTES
(a)
Output change with temperature (V
R
)
The absolute maximum difference between
the maximum output voltage and the
minimum output voltage over the specified
temperature range
(c) Operating current (I
R
)
Maximum operating current must be
derated as indicated in maximum ratings.
(d) Slope resistance (R
S
)
The slope resistance is defined as :
V
R
= V
max
- V
min
(b) Output temperature coefficient (T
C
V
R
)
The ratio of the output change with
temperature to the specified temperature
range expressed in ppm/°C
R
S
=
change
in
V
R
specifiedcurrentrange
∆
I = 5 - 0.5 = 4.5mA (typically)
(e) Line regulation
The ratio of change in output voltage to the
change in input voltage producing it.
T
c
V
R
=
∆
V
R
x
10
ppm
⁄
°C
V
R
x
∆
T
6
∆T=
Full temperature range
R
S
x
100
%
⁄
V
V
R
x
R
source
4-289
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