ZRT040
4.01V LOW POWER PRECISION REFERENCE SOURCE
Description
The ZRT040 is a monolithic integrated circuit providing a
precise stable reference voltage of 4.01V at 500μA.
The circuit features a knee current of 150μA and operation
over a wide range of temperatures and currents.
The ZRT040 is available in a SOT223 package for surface
mount applications. This device offers a trim facility whereby
the output voltage can be adjusted as shown in the
schematic diagram. This facility is used when 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.
Pin Assignments
SOT223
T
RIM
1
GND 2
V
R
3
4
Top View
(Pin 4 floating or
connected to pin 2)
Features
•
•
•
•
•
•
•
•
•
Trimmable output
Excellent temperature stability
Low output noise figure
-40 to 85°C operating temperature range
1% initial voltage tolerance
No external stabilizing capacitor required in most cases
Low slope resistance
No derating required at low temperatures
SOT223 package
Schematic Diagram
This circuit will allow the reference to be trimmed over a wide range. The device is specified over a ±5% trim range.
ZRT040
Document number: DS33258 Rev. 5 - 2
1 of 5
www.diodes.com
February 2011
© Diodes Incorporated
ZRT040
4.01V LOW POWER PRECISION REFERENCE SOURCE
Absolute Maximum Ratings
Parameter
Reverse Current (Note 1)
Operating Temperature: C grade
Storage Temperature
Notes:
Symbol
T
OMP
T
STG
Value
75
-40 to +85
-55 to +150
Unit
mA
°C
°C
1. Above 72°C this figure should be linearly derated to 15mA @ 125°C
Power Dissipation
Package
SOT223
(@T
amb
= 25°C unless otherwise stated)
Value
2
Unit
W
Temperature Dependent Electrical Characteristics
Grade C
-40 to 85°C
Typ.
Max.
7.5
15.0
24.0
50.0
Symbol
ΔV
R
T
C
V
R
Parameter
Output voltage change over operating temperature
range
Output voltage temperature coefficient
(see Note B)
Unit
mV
ppm/°C
Electrical Characteristics
(@T
amb
= 25°C unless otherwise stated)
Symbol
V
R
V
TRIM
T
C
V
TRIM
I
R
t
on
t
off
e
np-p
R
S
Parameter
Output voltage:
1% tolerance
Output voltage adjustment range
Change in T
C
V
R
with output adjustment
Operating current range
Turn-on time
Turn-off time
Output voltage noise
(over the range 0.1 to 10Hz)
Slope resistance (see Note C)
R
L
= 1kΩ
Peak to peak
measurement
I
R
= 0.5mA to 5mA
0.15
40
0.3
50
1.1
3.0
Conditions
I
R
= 500 µA
R
T
= 100kΩ
Min.
3.97
Typ.
4.01
±5
2.5
75
Max.
4.05
Unit
V
%
ppm/°C
mA
µs
µV
Ω
ZRT040
Document number: DS33258 Rev. 5 - 2
2 of 5
www.diodes.com
February 2011
© Diodes Incorporated
ZRT040
4.01V LOW POWER PRECISION REFERENCE SOURCE
Typical Characteristics
(a) Output change with temperature
The absolute maximum difference between the maximum
output voltage and the minimum output voltage over the
specified temperature range:
ΔV
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:
(d) Slope resistance (RS)
The slope resistance is defined as:
(e) Line regulation
The ratio of change in output voltage to the change in
input voltage producing it:
ΔT=
Full temperature range
(c
) Operating current (IR)
Maximum operating current must be derated as indicated in
maximum ratings.
ZRT040
Document number: DS33258 Rev. 5 - 2
3 of 5
www.diodes.com
February 2011
© Diodes Incorporated
ZRT040
4.01V LOW POWER PRECISION REFERENCE SOURCE
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Copyright © 2011, Diodes Incorporated
www.diodes.com
ZRT040
Document number: DS33258 Rev. 5 - 2
5 of 5
www.diodes.com
February 2011
© Diodes Incorporated
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