LM4040 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – Precision Micropower Shunt Voltage Reference

LM4040/4041
Micrel
LM4040/4041
Precision Micropower Shunt Voltage Reference
General Description
Ideal for space critical applications, the LM4040 and LM4041
precision voltage references are available in the subminia-
ture (3mm × 1.3mm) SOT-23 surface-mount package.
The LM4040 is the available in fixed reverse breakdown
voltages of 2.500V, 4.096V and 5.000V. The LM4041 is
available with a fixed 1.225V or an adjustable reverse break-
down voltage.
The LM4040 and LM4041’s advanced design eliminates the
need for an external stabilizing capacitor while ensuring
stability with any capacitive load, making them easy to use.
The minimum operating current ranges from 60µA for the
LM4041-1.2 to 74µA for the LM4040-5.0. LM4040 versions
have a maximum operating current of 15mA. LM4041
versions have a maximum operating current of 12mA.
The LM4040 and LM4041 utilizes zener-zap reverse break-
down voltage trim during wafer sort to ensure that the prime
parts have an accuracy of better than ±0.1% (A grade) at
25°C. Bandgap reference temperature drift curvature correc-
tion and low dynamic impedance ensure stable reverse
breakdown voltage accuracy over a wide range of operating
temperatures and currents.
Features
• Small SOT-23 package
• No output capacitor required
• Tolerates capacitive loads
• Fixed reverse breakdown voltages of 1.225, 2.500V,
4.096V and 5.000V
• Adjustable reverse breakdown version
• Contact Micrel for parts with extended temperature
range.
Key Specifications
• Output voltage tolerance (A grade, 25°C) .. ±0.1% (max)
• Low output noise (10Hz to 100Hz)
LM4040 ................................................ 35µV_RMS (typ)
LM4041 ................................................ 20µV_RMS (typ)
• Wide operating current range
LM4040 ................................................ 60µA to 15mA
LM4041 ................................................ 60µA to 12mA
• Industrial temperature range .................. –40°C to +85°C
• Low temperature coefficient ................ 100ppm/°C (max)
Applications
• Battery-Powered Equipment
• Data Acquisition Systems
• Instrumentation
• Process Control
• Energy Management
• Product Testing
• Automotive Electronics
• Precision Audio Components
Typical Applications
V_S
R_S
V_R
LM4040
LM4041
I_Q + I_L
I_{L VO}
I_Q
Figure 1. LM4040, LM4041 Fixed
Shunt Regulator Application
V_S
R_S
V_R
LM4041
Adjustable
V_O
R₁
V_O = 1.233 (R₂/R₁ + 1)
R₂
Figure 2. LM4041 Adjustable
Shunt Regulator Application
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com
January 2000
1
LM4040/4041