LM285Z-1.2G Integrated Circuits (ICs)

Temperature Coefficient:	80ppm/°C Typical
Base Part Number:	LM285
Supplier Device Package:	TO-92-3
Package / Case:	TO-226-3, TO-92-3 (TO-226AA)
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 85°C (TA)
Current - Cathode:	20µA
Current - Supply:	--
Voltage - Input:	--
Noise - 10Hz to 10kHz:	60µVrms
Noise - 0.1Hz to 10Hz:	--
Series:	--
Tolerance:	±1%
Current - Output:	20mA
Voltage - Output (Min/Fixed):	1.235V
Output Type:	Fixed
Reference Type:	Shunt
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Introduction

The LM285Z-1.2G is an integrated circuit (IC) voltage reference module from Texas Instruments. It is power management integrated circuit (PMIC)- Voltage Reference (VR). It is a high performance, 3-pin adjustable regulators with low dropout and low current power supply. It is used for precision voltage regulation and provides precise voltage accuracy over temperature, current, and time ranges.

Applications

The LM285Z-1.2G is specifically designed for applications requiring accurate and stable regulation of output voltage. The device allows a wide range of output voltage setting, thus can be used in a variety of applications. Common applications for LM285Z-1.2G include:* Automotive * Network cards* Uninterruptible Power Supplies (UPS)* High reliability systems* Personal computers* Portable communications equipment* Any other application requiring accurate and stable output voltage

Features

The LM285Z-1.2G has following features:* Small size and Low power consumption* Zero temperature coefficient* High precision voltage reference* Wide operating temperature range* Low drift over temperature* Low output noise* Input voltage range up to 5V

Operation

The LM285Z-1.2G consists of a low-power band gap reference and an adjustable error amplifier. The band gap reference provides a constant voltage reference, while the error amplifier boosts the output voltage of the band gap reference by a factor greater than unity.The input voltage (V IN ) is applied to the error amplifier. The voltage reference and the output voltage of the error amplifier are compared in the error amplifier. If the voltage reference is greater than the output voltage of the error amplifier, the error amplifier will increase its output voltage. Conversely, if the voltage reference is less than the output voltage of the error amplifier, the error amplifier will decrease its output voltage. This process is repeated until the two voltages match.The output voltage is adjustable by the external resistor resistance, R R . The output voltage is given by the equation V OUT = V REF * (1 + R R /R CTR ) where R CTR is a constant temperature resistor. The reference voltage of the LM285Z-1.2G is 1.2V. This voltage is buffered by the error amplifier and amplified by the external resistor. The output voltage of the error amplifier is regulated and maintained at the preset reference by the error amplifier.

Conclusion

The LM285Z-1.2G is an integrated circuit voltage reference module from Texas Instruments. It is a PMIC- Voltage Reference (VR). The device is specifically designed for applications requiring accurate and stable regulation of output voltage. The device allows a wide range of output voltage setting, thus can be used in a variety of applications. The LM285Z-1.2G consists of a low-power band gap reference and an adjustable error amplifier. The output voltage is adjustable by the external resistor resistance, and the output voltage is given by the equation V OUT = V REF * (1 + R R /R CTR ). The reference voltage of the LM285Z-1.2G is 1.2V.

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