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FEATURES

1

2

3

4

8

7

6

5

NC

NC

NC

ANODE

CATHODE

NC

CATHODE

ADJ

D OR PW PACKAGE

(TOP VIEW)

NC − No internal connection

ANODE

CATHODE

ADJ

LP PACKAGE

(TOP VIEW)

1

2

3

4

8

7

6

5

NC

NC

NC

ANODE

CATHODE

NC

CATHODE

ADJ

D OR PW PACKAGE

(TOP VIEW)

DESCRIPTION/ORDERING INFORMATION

ANODE

CATHODE

ADJ

LT1009

2.5-V INTEGRATED REFERENCE CIRCUIT

• Excellent Temperature Stability

• Wide Operating Current Range

• Initial Tolerance: 0.2% Max

• Directly Interchangeable With LM136

• Dynamic Impedance: 0.6 Ω Max

• Needs No Adjustment for Minimum

Temperature Coefficient

The LT1009 reference circuit is a precision-trimmed 2.5-V shunt regulator featuring low dynamic impedance and

a wide operating current range. The maximum initial tolerance is ±5 mV in the LP package and ±10 mV in the D

and PW packages. The reference tolerance is achieved by on-chip trimming, which minimizes the initial voltage

tolerance and the temperature coefficient,

α

Although the LT1009 needs no adjustments, a third terminal (ADJ) allows the reference voltage to be adjusted

±5% to eliminate system errors. In many applications, the LT1009 can be used as a terminal-for-terminal

replacement for the LM136-2.5, which eliminates the external trim network.

The LT1009 uses include 5-V system references, 8-bit analog-to-digital converter (ADC) and digital-to-analog

converter (DAC) references, and power-supply monitors. The device also can be used in applications such as

digital voltmeters and current-loop measurement and control systems.

The LT1009C is characterized for operation from 0°C to 70°C. The LT1009I is characterized for operation from

–40°C to 85°C.

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 1987–2009, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.