Diodes ZRT025 User Manual

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

1 of 5

www.diodes.com

February 2011

© Diodes Incorporated

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

2 of 5

www.diodes.com

-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