AP2121AK-3.2TRE1

Voltage Dropout (Max):	0.5V @ 200mA
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Protection Features:	Over Current
Control Features:	Enable
PSRR:	70dB (1kHz)
Current - Quiescent (Iq):	50µA
Current - Output:	200mA
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	3.2V
Voltage - Input (Max):	6V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

Power Management IC (PMIC) linear voltage regulators offer an integrated and cost effective solution for transforming input power of a system board. Among the PMICs, the AP2121AK-3.2TRE1 is a low-noise 2.9A linear voltage regulator that provides an output voltage adjustable from 0.8V to 3.2V and capable of delivering up to 2.9A of current.

Overview

The AP2121AK-3.2TRE1 is specifically designed for portable devices such as cellular phones, as well as digital imaging devices such as cameras, camcorders and digital video recorders, serving as an vital link between their inputs and outputs. It features a wide input voltage range, including a low input current with shutdown current of 3µA, so it can be used safely in portable and battery-operated applications.Aside from the wide input voltage range and the low shutdown current, the AP2121AK-3.2TRE1 has numerous features that makes it suitable for many PMIC applications. It offers over current limit protection, internal thermal shutdown protection and short circuit protection. These features minimize the risk of circuit damage due to excessive current through the output terminals. Furthermore, the AP2121AK-3.2TRE1 also offers low-noise operation and a high power efficiency ( > 92%) with extremely low supply current.

Application Field and Working Principle

The AP2121AK-3.2TRE1 is primarily used as a high-efficiency voltage regulator for mobile and portable applications such as cellular phones, PDAs and digital cameras. It can also be used for other applications where a wide output voltage range and low-noise performance is required. This includes high-end automotive, avionic, and medical instrumentation. The AP2121AK-3.2TRE1 achieves its excellent performance and regulation accuracy through its two-stage approach. The first stage is composed of an Error Amplifier (EA) and a voltage divider. This stage converts the Reference Voltage (VREF) to a linear output voltage which is then amplified by the EA. The output of the EA is then regulated by a transconductance amplifier (TA) in the second stage. The TA also accounts for the current drawn by the output terminals, thereby eliminating any DC offset in the final regulated output voltage. The AP2121AK-3.2TRE1 is further equipped with overload protection, current limit, thermal protection and other safety features to protect the system from excessive stress and overloads. This makes the product ideal for high-end applications which require reliable output current and improved power dissipation.

Conclusion

The AP2121AK-3.2TRE1 is a low-noise linear voltage regulator that uses a two-stage approach to provide excellent performance and regulation accuracy. It offers a wide input voltage range, low shutdown current, overload protection, current limit, thermal protection and other safety features. This makes it ideal to be used in mobile and portable applications such as cellular phones, PDAs and digital cameras, as well as in high-end automotive, avionic and medical instrumentation.

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