SNVS073C – APRIL 2000 – REVISED APRIL 2013
LM4121 Precision Micropower Low Dropout Voltage Reference
Check for Samples: LM4121
•2 Small SOT23-5 Package
• Low Voltage Operation
• High Output Voltage Accuracy: 0.2%
• Source and Sink Current Output: ±5 mA
• Supply current: 160 μA Typ.
• Low Temperature Coefficient: 50 ppm/°C
• Enable Pin
• Output Voltages: 1.25V and Adjustable
• Industrial Temperature Range: −40°C to +85°C
• (For Extended Temperature Range, −40°C to
125°C, Contact Texas Instruments)
• Portable, Battery Powered Equipment
• Instrumentation and Process Control
• Automotive & Industrial
• Test Equipment
• Data Acquisition Systems
• Precision Regulators
• Battery Chargers
• Base Stations
• Medical Equipment
The LM4121 is a precision bandgap voltage
reference available in a fixed 1.25V and adjustable
version with up to 5 mA current source and sink
This series reference operates with input voltages as
low as 1.8V and up to 12V consuming 160 µA (Typ.)
supply current. In power down mode, device current
drops to less than 2 μA.
The LM4121 comes in two grades A and Standard.
The best grade devices (A) have an initial accuracy of
0.2%, while the standard have an initial accuracy of
0.5%, both with a tempco of 50ppm/°C ensured from
−40°C to +125°C.
The very low operating voltage, low supply current
and power-down capability of the LM4121 makes this
product an ideal choice for battery powered and
The device performance is ensured over the industrial
temperature range (−40°C to +85°C), while certain
specs are ensured over the extended temperature
range (−40°C to +125°C). Please contact Texas
Instruments for full specifications over the extended
temperature range. The LM4121 is available in a
standard 5-pin SOT-23 package.
* Resistors are removed on the LM4121-ADJ
Figure 1. LM4121-1.2 Block Diagram
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