LT3020EDD-1.8#TRPBF

Current - Output:	100mA
Base Part Number:	LT3020
Supplier Device Package:	8-DFN (3x3)
Package / Case:	8-WFDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity
Control Features:	Enable
PSRR:	56dB (120Hz)
Current - Supply (Max):	3.5mA
Current - Quiescent (Iq):	250µA
Series:	--
Voltage Dropout (Max):	0.285V @ 100mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.8V
Voltage - Input (Max):	10V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The LT3020EDD-1.8#TRPBF is a high performance low dropout linear voltage regulator from Linear Technology. It is specifically designed to handle applications which require high efficiency and low output noise, while being able to maintain very low supply current (<2.2μA). The device’s extremely low dropout voltage, combined with its low quiescent current and wide range of output voltage options make it a versatile and reliable option for any system.

Application Field

The LT3020EDD-1.8#TRPBF is mainly used for applications where high efficiency and low noise are of paramount importance such as medical, industrial and automotive systems. Additionally, its wide selection of out voltages from 1.2V to 5.0V makes it suitable for powering many electronic designs. The device can be used as an LDO regulator in order to deliver constant and reliable power to the load. It is particularly desirable for systems which need very low input V_IN to start up, for instance it can start up from V_IN = 0.6V. Moreover, its low supply current consume makes it a good option for battery powered applications.

Working Principle

The LT3020EDD-1.8#TRPBF is a linear low dropout voltage regulator. It works by comparing the output voltage (V_OUT) to an internal reference voltage (V_REF) and outputting a PWM signal to an external power switch which adjusts the input voltage (V_IN) accordingly.The power switch is operated over a certain switching frequency, with a maximum duty cycle of ~25%. When the load current is low, the output voltage will remain at a constant level. On the other hand, when the load current increases, the output voltage will tend to drop. The LDO regulator monitors this by way of the error amplifier and compensates for it by increasing the switching frequency and duty cycle of the power switch.

Conclusion

The LT3020EDD-1.8#TRPBF from Linear Technology provides an efficient and reliable low dropout linear regulator. It is suitable for powering many battery powered and small form factor applications due to its low quiescent current and extremely low dropout voltage. The large range of output voltages available makes it even more attractive for a wider range of applications. Furthermore, its working principle of monitoring the output voltage and adjusting the input voltage accordingly makes it reliable and consistent.

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