1FEATURES
· Excellent Temperature Stability
· Initial Tolerance: 0.2% Max
· Dynamic Impedance: 0.6 Ω Max
· Wide Operating Current Range
· Directly Interchangeable With LM136
· Needs No Adjustment for Minimum
Temperature Coefficient

DESCRIPTION/ORDERING INFORMATION
ANODE CATHODE
ADJ
LT1009
www.ti.com................................................................................................................................................................. SLVS013N–MAY 1987–REVISED MAY 2009
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, aVZ.
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.