DS1705ESA

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The DS1705ESA is a supervisor IC in the form of PMIC-Supervisors. It is designed to monitor the power supply, providing power-on reset (POR) and power-fail warning outputs. It is a ±1% accurate device designed to the ensure that the correct supply voltage is maintained within a system. This unit is mainly intended to power microcontrollers and digital logic circuits, while also ensuring that currents up to 15A are delivered.

The DS1705ESA regulator has a wide supply voltage range of 4.5V to 20V and a maximum output current of 15A. It also includes an onboard 0.3V reference voltage for applications requiring adjustable outputs. Additionally, the IC features an adjustable power-on reset (POR) output and power-fail warning outputs for external power supply sequencing.

The DS1705ESA incorporates several features for the monitoring of the supply voltage such as a single reset warning signal for both rising and falling supply voltages, an adjustable reset threshold and a hysteresis (HYS) feature to prevent false triggering of the output signal. It also includes an overvoltage/undervoltage lockout (UV/OVL) feature to protect the device when the supply voltage goes beyond the specified threshold.

The DS1705ESA PMIC employs a two-stage control algorithm to ensure accurate regulation and fast transient response. In the first stage, the IC measures the differences between the output voltage and the reference voltage and adjusts the output accordingly. The second stage is a conventional Pulse Width Modulation (PWM) control. This method typically involves a pulse train containing pulse bursts that are used to adjust the output voltage. This ensures that the output voltage remains within the specified range during normal operation.

In summary, the DS1705ESA is a supervisor IC for applications that require precise voltage regulation. It provides power-on reset (POR) and power-fail warning outputs and includes features such as adjustable reset thresholds and hysteresis for noise immunity. It also incorporates overvoltage/undervoltage lockout (UV/OVL) and a two-stage control algorithm for fast transient response and accurate voltage regulation. Such features make it suitable for microcontrollers and digital logic circuits.

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