ZRT025
2.5V LOW POWER PRECISION REFERENCE SOURCE
Description
The ZRT025 is a monolithic integrated circuit providing a
precise stable reference voltage of 2.5V at 500μA.
The circuit features a knee current of 150μA and operation
over a wide range of temperatures and currents.
The ZRT025 is available for surface mount applications. This
product 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.
ZRT025
Document number: DS33257 Rev. 5 - 2
1 of 5
www.diodes.com
February 2011
© Diodes Incorporated
ZRT025
2.5V 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 25mA @ 125°C
Power Dissipation
Package
SOT223
(@T
amb
= 25°C unless otherwise stated)
Value
2
Unit
W
Temperature Dependent Electrical Characteristics
Symbol
ΔV
R
T
C
V
R
Parameter
Output voltage change over relevant
temperature range
Output voltage temperature coefficient
2.7
15.0
Grade C
-40 to 85°C
8.8
50.0
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
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
10
0.3
50
0.85
2.0
Parameter
Conditions
I
R
= 500 µA
R
T
= 100kΩ
Min.
2.475
Typ.
2.500
±5
2.5
75
Max.
2.525
Unit
V
%
ppm/°C
mA
µs
µV
Ω
ZRT025
Document number: DS33257 Rev. 5 - 2
2 of 5
www.diodes.com
February 2011
© Diodes Incorporated
ZRT025
2.5V 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
(c) Slope resistance (RS)
The slope resistance is defined as :
(d) Line regulation
The ratio of change in output voltage to the change in
input voltage producing it.
ΔT=
Full temperature range
ZRT025
Document number: DS33257 Rev. 5 - 2
3 of 5
www.diodes.com
February 2011
© Diodes Incorporated
ZRT025
2.5V LOW POWER PRECISION REFERENCE SOURCE
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www.diodes.com
ZRT025
Document number: DS33257 Rev. 5 - 2
5 of 5
www.diodes.com
February 2011
© Diodes Incorporated
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