LM4041 Improved Precision Micropower Shunt Voltage Reference

18 April 2023 - 0 Comments

LM4041 Shunt Voltage Reference

LM4041 Pinout

The LM4041 is a highly precise, two-terminal shunt mode, bandgap voltage reference that is perfect for applications where space is at a premium. Its reverse breakdown voltage is fixed at 1.225V. To ensure optimal accuracy, the LM4041 features laser-trimmed resistors that provide precise initial accuracy. With a temperature coefficient of 100ppm/°C, this device is available in four grades of initial accuracy, ranging from 0.1% to 1%. Additionally, the LM4041 has a shunt current capability of 60µA to 12mA, along with a low dynamic impedance that helps to ensure stable reverse-breakdown voltage accuracy over a wide range of operating temperatures and currents. The LM4041 is available in a 3 pin SC70 package. All in all, the LM4041 is an impressive device that is sure to meet the needs of those in need of precise voltage references in tight spaces.

LM4041 Pinout Configuration

Pin Number	Pin Name	Description
1	+	Positive Terminal
2	-	Negative Terminal
3	NC	Leave unconnected, or connect to pin 2

Features

Ultra-Small 3-Pin SC70 Package
0.1% (max) Initial Accuracy
100ppm/°C (max) Temperature Coefficient Guaranteed over -40°C to +125°C Temperature Range
Wide Operating Current Range: 60µA to 12mA
Low 20µVRMS Output Noise (10Hz to 10kHz)
1.225V Fixed Reverse Breakdown Voltage
No Output Capacitors Required
Tolerates Capacitive Loads

LM4041 Alternative

Zener Diodes, TL431 (Programmable),

Variants

LM4041 Variants

How To Use LM4041 Voltage Reference?

The LM4041 shunt references use the bandgap principle to produce a stable, accurate voltage. The device behaves similarly to an ideal Zener diode; a fixed voltage of +1.225V is maintained across its output terminals when biased with 60μA to 12mA of reverse current. It will also behave like a silicon diode when it is forward biased with a current of 10mA. The image below shows the typical application diagram of the LM4041.

LM4041 Voltage Reference Application Circuit Diagram

Choose the value of Source resistor(Rs) with minimum vs and maximum load current in mind. Maintain a minimum I_shunt of 60uA at all times. The R_S value should be large enough to keep I_SHUNT less than 12mA for proper regulation when V_S is maximum and I_LOAD is at a minimum. To prevent damage to the device, I_SHUNT should never exceed 20mA. Use the following equation to calculate the value of resource resistance: