ZSR900N8TA

Current - Output:	200mA
Base Part Number:	ZSR900
Supplier Device Package:	8-SO
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 125°C
Protection Features:	Over Temperature, Short Circuit
Control Features:	--
PSRR:	57dB (120Hz)
Current - Quiescent (Iq):	600µA
Series:	--
Voltage Dropout (Max):	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	9V
Voltage - Input (Max):	20V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Digi-Reel®

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ZSR900N8TA Application Field and Working Principle

Introduction

The ZSR900N8TA is a three-terminal linear voltage regulator integrated circuit specifically designed for applications where low dropout (LDO) performance, accuracy and low ground current consumption are critical. It features an internally trimmed bandgaps voltage reference, error amplifier, current limit circuitry, and a high efficiency P-channel MOSFET pass transistor. The ZSR900N8TA is offered in the standard SOT-223 package and operates with an input voltage range of 2.0V to 5.5V.

Application Field

The ZSR900N8TA is designed to be used in a wide range of applications such as cellular phones, handheld electronic devices, notebooks, laptop computers and other portable electronic devices. This LDO can handle a maximum load current of intervals from 0.3 to 1.0A and adjusts the output voltage through a resistor divider to any voltage within the specified range.The low power consumption and the accurate output current limit make the ZSR900N8TA an ideal choice for portable applications where power saving is a must. Additionally, the ZSR900N8TA can be easily combined with other LDOs, to give a variety of low-voltage outputs such as 3.0V, 3.3V, and 5V.

Working Principle

The ZSR900N8TA is based on a standard three-terminal voltage regulator architecture: input voltage is applied to the positive input pin, current is sensed at the ground pin, and output voltage is available at the output pin.The ZSR900N8TA is composed by an internally trimmed bandgap voltage reference, error amplifier, current limit circuitry, and a high efficiency P-channel MOSFET pass transistor.The bandgap voltage reference provides a stable reference voltage which is independent from temperature and supply voltage. The error amplifier compares the voltage reference with the programmed output voltage and generates control signal to vary the gate voltage of the pass transistor accordingly.The current limit circuitry senses the load current and turns off the pass transistor if the current limit is exceeded. This prevents excess current from flowing in to the load, protecting the circuit and the LDO from high current overload.The P-channel MOSFET pass transistor is selected to allow the output voltage to be regulated with the lowest possible dropout voltage, improving efficiency and reducing quiescent current consumption.

Conclusion

The ZSR900N8TA is an excellent choice for a low dropout linear voltage regulator for applications requiring high accuracy, low power consumption and a range of output voltages. Its integrated bandgap voltage reference, error amplifier and current limit, combined with its high efficiency P-channel MOSFET pass transistor make it highly reliable, cost effective and applicable to a wide range of portable and other electronic applications.

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