MAX6470TA18AD3+T

Current - Output:	300mA
Base Part Number:	MAX6470
Supplier Device Package:	8-TDFN-EP (3x3)
Package / Case:	8-WDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity, Short Circuit
Control Features:	Enable, Reset
PSRR:	--
Current - Quiescent (Iq):	136µA
Series:	--
Voltage Dropout (Max):	--
Voltage - Output (Max):	5.5V
Voltage - Output (Min/Fixed):	1.25V (1.8V)
Voltage - Input (Max):	5.5V
Number of Regulators:	1
Output Type:	Adjustable (Fixed)
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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The MAX6470TA18AD3+T is a low-dropout (LDO) linear voltage regulator designed to provide a low-noise, regulated output of up to 1.8A. It offers a low noise figure (0.3μVrms) and low EMI emission, as well as load and line regulation of typically 0.1%, with a maximum output voltage error of 0.4%.The MAX6470TA18AD3+T is suitable for a wide range of applications, from applications requiring small temporary power losses from large power buses to applications requiring highly accurate power management. It is especially suitable for low-noise, high-impedance outputs, such as high-performance analog circuits. Additionally, the device is suitable for use in a variety of consumer and industrial applications.The MAX6470TA18AD3+T utilizes a two-stage architecture. In the first stage, the voltage drop across a series by-pass MOSFET is controlled. This MOSFET dissipates the power losses associated with the LDO, and its potential input voltage range can be extended by increasing the MOSFET’s current limit and adding a large bypass capacitor across its drain and source terminals. This stage reduces the input impedance, noise, and the time it takes for the LDO to start up.In the second stage, the voltage drop across an internal P-channel MOSFET is controlled. This MOSFET employs a constant-on-time control loop. It also determines the LDO’s output current limit and minimum operating voltage by operating on either a preset, constant-on-time current limit loop or voltage regulation loop. The P-channel MOSFET has a low gate-to-source threshold voltage, which allows the MAX6470TA18AD3+T to start up the output voltage quickly and accurately.The MAX6470TA18AD3+T employs external compensation components to enhance line and load regulation. A resistor connected between the VOUT and GND pins sets the voltage reference, while capacitors connected to the VOUT and GND pins improve the transient response. The chip also includes an internal temperature-limiting circuit that prevents it from overheating.To guarantee its specified output current capability, the MAX6470TA18AD3+T also includes a large number of thermal dissipation elements. These elements are typically composed of large aluminum pads, designed to maximize the area surface exposed to the ambient air. This ensures that the dissipated heat can be quickly transferred to the environment, preventing the LDO from overheating.The MAX6470TA18AD3+T is an ideal solution for a wide range of applications that require a low-noise, high-impedance, regulated output. It is suitable for wireless applications where low-noise operation is of paramount importance, as well as for applications where the power losses from a large power bus are limited. In addition, its temperature-limiting functionality ensures that it can operate safely in harsh environments.

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