LM4128AMF-1.8

Noise - 0.1Hz to 10Hz:	170µVp-p
Base Part Number:	LM4128
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Current - Supply:	100µA
Voltage - Input:	2.2 V ~ 5.5 V
Noise - 10Hz to 10kHz:	--
Series:	--
Temperature Coefficient:	75ppm/°C
Tolerance:	±0.1%
Current - Output:	20mA
Voltage - Output (Min/Fixed):	1.8V
Output Type:	Fixed
Reference Type:	Series
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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LM4128AMF-1.8 Application Field and Working Principle

The LM4128AMF-1.8 is part of a family of voltage references specifically designed for use in personal, commercial and automotive applications. These voltage references offer improved accuracy, low temperature coefficient and low power operation. The LM4128AMF-1.8 has been designed to provide an exact voltage level of 1.8 volts, regardless of the ambient temperature or power supply variations. It also features a low temperature coefficient of 6.6 ppm/°C, which ensures its accuracy over a wide range of temperatures.The LM4128AMF-1.8 also features a low typical supply current of 60 uA and an exceptionally low dropout voltage of 100 mV at 10 mA. This low quiescent current and low dropout voltage capability can extend the life of a battery operated system by working efficiently in the low power states. The LM4128AMF-1.8 is packaged in a tiny SOT23-3 package which is ideal for space critical applications. For improved performance and long-term stability, it is packaged in an industry standard SOIC-8 package with a two compact 8-pin packages. The LM4128AMF-1.8 is an IC that is used in power supply designs to provide a stable reference voltage, preventing the power supply from dropping or increasing in output voltage due to variance in input voltage or load conditions. It is a three-terminal voltage reference device with an operating temperature range of -40 °C to +125 °C.The LM4128AMF-1.8 has a wide voltage range of 1.6V to 5.5V, as well as a high accuracy of ± 0.2% over 8mA to 200mA of load current and a temperature coefficient of 6.6ppm/°C.The LM4128AMF-1.8 is typically used in automotive applications such as temperature sensors, variable-speed controllers, power elapsing timers, and power supply designs due to its low current consumption and superior low, high temperature and line regulation properties.The secret of the LM4128AMF-1.8\'s remarkable performance lies in its dynamic on-chip circuitry. The dynamic circuitry reduces errors due to line, load and temperature changes. This dynamic circuitry, which is patented by National Semi-Conductor, is comprised of a differential amplifier gain stage with a common-base stage driving a precision series bandgap reference.The on-chip amplifier allows the bandgap reference to be delivered to the load, via a current-sensing output transistor. This prevents the LM4128AMF-1.8 from loading the power supply and degrading other circuitry. The output voltage remains very accurately independent of load current and power supply regulation.The LM4128AMF-1.8 can be easily adjusted via an external resistor divider from the adjustable output pin. The maximum output voltage is nominally 1.8 volts, but can be adjusted as low as 0.7 volts for some specific applications.In conclusion, the LM4128AMF-1.8 is a three terminal voltage reference IC designed for use in automotive, commercial, and personal applications. With its excellent accuracy, temperature coefficient, low power operation and small size this IC is ideal for use in space critical applications.

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