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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.
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
Pin Assignments
SOT223
T
RIM
GND
V
R
(Pin 4 floating or
connected to pin 2)
1
2
3
Top View
4
ZRT025
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
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ZRT025
2.5V LOW POWER PRECISION REFERENCE SOURCE
Absolute Maximum Ratings
Parameter Symbol Value Unit
Reverse Current (Note 1) 75 mA
Operating Temperature: C grade T
Storage Temperature T
Notes: 1. Above 72°C this figure should be linearly derated to 25mA @ 125°C
OMP
-55 to +150 °C
STG
Power Dissipation (@T
= 25°C unless otherwise stated)
amb
Package Value Unit
SOT223 2 W
Temperature Dependent Electrical Characteristics
Symbol Parameter
ΔVR
TCVR Output voltage temperature coefficient 15.0 50.0 ppm/°C
Output voltage change over relevant
temperature range
Electrical Characteristics (@T
Symbol Parameter Conditions Min. Typ. Max. Unit
VR
V
TRIM
TCV
TRIM
IR Operating current range 0.15 75 mA
ton
t
off
e
np-p
RS Slope resistance (see note C) IR = 0.5mA to 5mA 0.85 2.0 Ω
Output voltage
1% tolerance
Output voltage adjustment range RT = 100kΩ ±5 %
Change in TCVR with output adjustment 2.5 ppm/°C
Turn-on time
Turn-off time
Output voltage noise
(over the range 0.1 to 10Hz)
= 25°C unless otherwise stated)
amb
Peak to peak
measurement
ZRT025
Document number: DS33257 Rev. 5 - 2
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-40 to +85 °C
Grade C
-40 to 85°C
2.7 8.8 mV
IR = 500 µA 2.475 2.500 2.525 V
= 1kΩ
R
L
50 µV
10
0.3
Unit
µs
February 2011
© Diodes Incorporated
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Typical Characteristics
ZRT025
2.5V LOW POWER PRECISION REFERENCE SOURCE
(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=VMAX
(b) Output temperature coefficient (T
The ratio of the output change with temperature to the
specified temperature range expressed in ppm/°C
ΔT= Full temperature range
- V
MIN
)
CVR
ZRT025
Document number: DS33257 Rev. 5 - 2
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(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.
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ZRT025
2.5V LOW POWER PRECISION REFERENCE SOURCE
Ordering Information
Device Tol %
ZRT025GC1TA 1 -40 to +85 ZRT025C1 7” 12mm 1000
Operating
Temperature
Part Mark
Reel
Size
Package Outline Dimensions (All Dimensions in mm)
SOT223
Tape
Width
Quantity
Per Reel
DIM
A - 1.80 - 0.071 e 2.30 BSC 0.0905 BSC
A1 0.02 0.10 0.0008 0.004 e1 4.60 BSC 0.181 BSC
b 0.66 0.84 0.026 0.033 E 6.70 7.30 0.264 0.287
b2 2.90 3.10 0.114 0.122 E1 3.30 3.70 0.130 0.146
C 0.23 0.33 0.009 0.013 L 0.90 - 0.355 D 6.30 6.70 0.248 0.264 - - - - -
Note: Controlling dimensions are in millimeters. Approximate dimensions are provided in inches.
Millimeters Inches
Min Max Min Max Min Max Min Max
DIM
Millimeters Inches
ZRT025
Document number: DS33257 Rev. 5 - 2
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ZRT025
2.5V LOW POWER PRECISION REFERENCE SOURCE
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ZRT025
Document number: DS33257 Rev. 5 - 2
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