SI-3025LSA

Voltage Dropout (Max):	0.8V @ 1A
Supplier Device Package:	8-SOP
Package / Case:	8-SOIC (0.173", 4.40mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-20°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	Enable
PSRR:	57dB (100Hz ~ 120Hz)
Current - Quiescent (Iq):	2.5mA
Current - Output:	1A
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	2.5V
Voltage - Input (Max):	3.5V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Not For New Designs
Packaging:	Tape & Reel (TR)

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Introduction

SI-3025LSA is a family of low-dropout linear voltage regulator integrated circuits that provide a regulated output voltage, while allowing a wider range of input voltages to be used. This makes them useful in situations where input voltage variability or low-battery warning levels must be taken into consideration. Its output voltage is adjustable, dependent upon external components, making it an ideal choice for applications requiring an adjustable output voltage.

Application Fields of SI-3025LSA

SI-3025LSA finds a wide range of applications in the fields of communication, automotive, computers and consumer electronics, where stability and accuracy are important factors. It can be used for microprocessor core voltage control, low-voltage power control, battery chargers, medical equipment, and other AC/DC applications.Since SI-3025LSA devices have a low quiescent current, they can be used in mobile and portable applications where battery power saving is essential. This makes it an attractive choice for low-power, low-voltage portable electronic applications such as cellular phones and PDAs.One of the most popular applications is in power management circuits for mobile devices, as the large range of input voltage allows for a wider range of battery connection options. SI-3025LSA is also being used in discrete low-dropout applications, such as PCMCIA, audio amplifiers, flashlights and other standby applications.

Working Principles of SI-3025LSA

SI-3025LSA integrated circuits employ a two-level voltage regulation principle that works differently based on the level of load current. Under light load current (I_LOAD < I_ADJ), the regulator operates non-disruptively, controlling the output voltage with a negative regulation loop, compared to conventional positive regulation. Under extreme load current (I_LOAD > I_ADJ), the SI-3025LSA integrated circuits operate by adapting their output voltage drop to additional current demands, thus ensuring minimum output voltage change from unloaded to full-load conditions.The structure of the SI-3025LSA devices is an on-chip NPN bipolar power transistor, a comparator and an integrated current limit architecture. The control of the output voltage is done by a pair of resistors. One resistor (R_SET) is in series with a zener diode (V_SET), which sets the output voltage reference, and the other resistor (R_FB) is connected between the output of the integrated circuit and the inverting input of the comparator.The voltage reference and the R_FB resistor form a negative feedback loop, allowing the device to react to changes in the output voltage. If the current in the device increases beyond a certain threshold, the output voltage fluctuations are limited due to the limited voltage drop across the device. If the current increases further, the voltage regulator will reduce its output voltage to prevent changes in the output.

Conclusion

SI-3025LSA integrated circuits provide a highly efficient, accurate, and stable power management and voltage regulation for a variety of applications. The wide range of input voltage and adjustable output voltage make it suitable for a wide range of applications. With the low quiescent current, this IC family is a great choice for portable and mobile applications, where battery power saving is essential.

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