Current - Output:	300mA
Base Part Number:	SI91871
Supplier Device Package:	PowerPAK® MLP33-5
Package / Case:	PowerPAK® MLP33-5
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Protection Features:	Over Temperature, Reverse Polarity, Short Circuit
Control Features:	Enable
PSRR:	60dB ~ 30dB (1kHz ~ 100kHz)
Current - Supply (Max):	275µA
Current - Quiescent (Iq):	150µA
Series:	--
Voltage Dropout (Max):	0.415V @ 300mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	3.3V
Voltage - Input (Max):	6V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

The SI91871DMP-33-E3 is a Point-of-Load (POL) PMIC (Power Management IC) designed to reduce power consumption, improve power quality and reliability, and regulate voltage levels in electronic systems. It is part of the high-performance linear voltage regulators product family from Silicon Image.The SI91871 works as an adjustable regulator, providing high efficiency Under Voltage Lockout (UVLO) and load regulation over a wide input voltage range. With its two load switches, power can be monitored effectively and efficiently, allowing for tight control of the system current. Additionally, it offers excellent output voltage accuracy and transient response, reducing system design time to the minimum. The SI91871 can be used in a variety of applications, such as off-line powered industrial equipment, home appliances, and communications systems, among others.

Application Field and Working Principle

The SI91871DMP-33-E3 is principally designed for applications requiring a precision voltage regulator with adjustable output voltage levels. Its adjustable-output feature makes it ideal for regulating general-purpose power supplies in a variety of applications. It can be used to power multiple point of load (PoL) regulators, providing an adjustable output voltage of up to 33V.The main components of the SI91871 are: an adjustable voltage regulator, two load switches, a power-good output terminal, and a shutdown terminal. The adjustable regulator uses PWM (Pulse Width Modulation) to control the output voltage. The two load switches allow for the power load to be monitored effectively and efficiently, while the power-good output terminal indicates when the output voltage is within the required set tolerance. Finally, the shutdown terminal can be used to enable or disable the regulator.The SI91871 utilizes an innovative architecture to ensure the highest power accuracy and efficiency. It features a regulated output voltage of ±0.5% and an efficiency of up to 90% over its full input voltage range. The SI91871 also offers Under Voltage Lockout (UVLO) and Load Regulation, further enhancing system performance and stability.

Conclusion

The SI91871DMP-33-E3 is a high-performance Point-of-Load (POL) PMIC designed to reduce power consumption, improve power quality and reliability, and regulate voltage levels in electronic systems. It is well suited for applications requiring a precision voltage regulator with adjustable output voltage levels. With its two load switches, power can be monitored effectively and efficiently, allowing for tight control of the system current. Additionally, the SI91871 offers excellent output voltage accuracy and transient response, along with Under Voltage Lockout (UVLO) and Load Regulation, further enhancing system performance and stability.

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