DS1233A-10+

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Power Management Integrated Chips (PMICs) are devices designed to convert, regulate and monitor a system’s voltage supply from different types of power sources. Their use results in lowering system costs and allows for design optimization for energy efficiency, performance and reliability. One type of PMIC is the Supervisors which are designed to protect a system against wrong voltage inputs, over-current, over-temperature and other power supply instability issues. The DS1233A-10+ is part of the Microchip family of Supervision products and is a one-stop shop in terms of providing power supply monitoring and supervisory functions for various applications requiring simple power supply selection.

The DS1233A-10+ is a single chip voltage supervisor solution that operates from +2.7V to +5.5V, supports both open drain or push-pull reset outputs, and has a wide reset trip threshold range of +2.2V to +5.2V. It is available in the Green SOT-23-5 package to save board space, as well as a SOIC-8 package option. The DS1233A-10+ is a low power, low quiescent current device, allowing it to be used in mobile applications or any application where current draw is a concern.

In terms of its application field, the DS1233A-10+ is suitable for a variety of protection and supervisor applications, including handheld devices, laptops, audio systems, consumer electronics, and industrial controllers. Its reset output trip threshold can be adjusted to optimize system power on/off control in various designs, and its dual-mode reset output (open-drain and push-pull) provides a variety of reset system solutions. Moreover, its push-pull output can be used for systems with low noise but limited power supply ramp rates. Its SOT-23-5 and SOIC-8 packages make it suitable for most power systems in these applications.

The DS1233A-10+ also provides reliable, backed-up supervisory power that is essential in all battery-based applications. Its supply voltage monitoring features are geared towards easy implementation of microcontroller reset circuits, while its voltage reference and brown-out function helps protect against system crashes caused by over-voltage conditions. Additionally, its over-voltage detection feature works as a warning signal when the monitored voltage reaches an undesired level.

In terms of its working principle, the DS1233A-10+ monitors its VDD pin for power supply voltage presence, accuracy, and transients. If the voltage is lower than the threshold voltage and/or exceeds the trip voltage limits, it will signal a reset/power-on reset/brown-out reset signal to a microcontroller or another device connected to its RESET/RESETB pin. The reset threshold voltage is factory-calibrated to 2.2V but is adjustable between 2.2V and 5.2V over the full operating voltage range. This helps in optimizing system power on/off control in various designs. The reset event is signaled with both an open-drain and push-pull output, meaning it can either be connected to an open-drain device, such as a transistor, or the supply voltage itself (in the push-pull mode).

Other features of the DS1233A-10+ include temperature protection, brown-out protection, power-up/power-down protection and over-voltage protection; all of which can ensure robust protection for applications that use the device as a supervisor. The temperature protection is designed to monitor the ambient temperature at a junction temperature of +135°C (typical) and will generate an alarm or reset signal if it is exceeded. The brown-out protection is designed to prevent outages when the voltage drops below the specified threshold (2.2V default) and can be used in applications that require the system to be restarted when the power supply returns. The power-up/power-down protection helps protect against failure due to voltage surges, while the over-voltage protection helps protect against failure due to over-voltage conditions.

The DS1233A-10+ is a very useful device for protecting and monitoring a variety of systems from various types of power supply issues. Its adjustable reset threshold and dual-mode reset output options make it the ideal device for protecting against wrong voltage inputs, over-current, over-temperature, and other power supply instability issues. Its low power, low quiescent current design also makes it suitable for mobile applications or any application where current draw is a concern.

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