MAX6715AUTZED1+T

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The MAX6715AUTZED1+T is a family of advanced low-quiescent-current, low-dropout (LDO) linear regulators that includes a precision reset timer and manual reset capability in a small 6-pin SOT23 package. This LDO series provides and adjustable voltage range of ​1.8V to 5.0V, up to 200mA power, and up to 500mV dropout voltage. As a Power Management IC (PMIC), the MAX6715AUTZED1+T provides an easily implemented and cost-effective way to achieve stable, low-voltage and accurate power regulation under demanding situations.

The MAX6715AUTZED1+T application field can be as a supervisor for microprocessor systems. This part integrates a reset generator and multiple fixed-voltage regulators to supply power in applications that require supervising and powering a microprocessor. This part can be used alone or in conjunction with other voltage regulators, including VRAMP and HV regulators, without requiring external components or adjustments. This part has flexibility to be used as a level shifter, adjustable voltage regulator, and reset supervisor in a wide range of microprocessor-based products.

An additional feature of the MAX6715AUTZED1+T is a power-good (PG) output that uses an open-drain comparator circuit to signal when the power supply voltage has stabilized. The microprocessor systems can use the PG output to indicate a successful reset and provide a reliable indication of system power status.

The MAX6715AUTZED1+T working principle is somewhat similar to other LDO components. The part contains a voltage reference, an error amplifier, and a power field-effect transistor (FET) to supply current to the load under normal conditions. During reset conditions, a logic signal shuts down the power FET and activates the external reset signal and initiates the reset protocol, as defined by the application. Upon receipt of the reset signal, circuitry inside the device starts a precision timing cycle to wait for the output voltage to stabilize and reach the desired level. When the reset signal is in the high state, the device begins monitoring the internal voltage signal, produced by the voltage reference, against the input voltage.

When the input voltage reaches the desired level, the device issues the power-good signal and Stop signal which is used to enable and disable the power-good signal. As mentioned above, the power-good signal is used to signal to the system when the power is ready. To de-assert the reset signal, the user needs to configure the minimum reset off-time by adjusting two external capacitors. The two capacitors must be selected such that the minimum reset off-time is long enough to guarantee the desired voltage is reached prior to the system powering up.

The MAX6715AUTZED1+T can also be used as a standalone LDO. It typically takes up to 0.5μF of capacitance from the output pin to ground and 0.2μF from the input pin to ground. The device can provide up to 200mA of current to the load from an input voltage of 1.8V to 5V. The drop out voltage of the device is 400mV at 100mA and about 500mV at 200mA under normal conditions.

The MAX6715AUTZED1+T is a low-cost solution for power-supervisors and monitoring systems. This integrated component can provide a reset capability with precision timing and power good signal to ensure accurate and reliable power monitoring. The flexibility of this LDO component can also be used to provide adjustable output voltage, level shifter and reset supervisor across many microprocessor-based systems.

Conclusion

The MAX6715AUTZED1+T is a single-channel IC for low-dropout linear regulators. This LDO series provides and adjustable voltage range of ​1.8V to 5.0V and up to 200mA power. As a Power Management IC (PMIC), this component provides an easily implemented and cost-effective way to achieve stable, low-voltage and accurate power regulation under demanding situations. The MAX6715AUTZED1+T can be used as a power-management supervisor as it contains a reset generator, multiple fixed-voltage regulators, and a power-good output to indicate successful reset. The MAX6715AUTZED1+T can also be used as a standalone LDO with adjustable output voltage and a maximum drop out voltage of 500mV.

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