DS1836C-20

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PMIC supervisors are integrated circuits that keep computer systems running smoothly by managing the power supply within a system. The DS1836C-20 is a 20-mA push-pull mini-supervisor that incorporates advanced features to provide high performance fault protection. It is designed to provide accurate monitoring of 2.97 to 3.63-V supply rails without external components.

Overview

The DS1836C-20 is a highly integrated, 20-mA push-pull mini-supervisor that provides comprehensive fault protection in a wide variety of systems. It features an active-low push-pull reset output for microprocessors and DSPs, and an active-low reset output for other ICs. The IC also includes an active-high push-pull power-good (PGOOD) output, providing status information to the system. The PGOOD output goes low when the VCC voltage drops below the sync voltage (VS) or power-up threshold (TLV). This output automatically goes high once VCC exceeds the reset threshold (TH) or reset-back threshold (THB). It also provides a reset-back window of approximately 0.5 V, allowing the device to be shut down or reset with minimal power consumption.

Features

• 2.97-V to 3.63-V operation
• Push-pull reset and power-good outputs
• Integrated OVP and UVLO protection
• Programmable reset assertion/deassertion delay
• Programmable reset pulse width
• Reset-back window of ± 0.5 V
• Low power consumption
• Small 1.2-mm x 1.2-mm package

Application Fields

The DS1836C-20 supervisor is well suited for numerous applications including portable electronics, industrial systems, telecommunications and computers, consumer electronics, and automotive use, as well as many other system control applications. It is designed to monitor battery voltage, power fail, and system reset in notebook computers, personal digital assistants, mobile phones, gaming consoles, automotive start-stop systems and general consumer electronics.

Working Principle

The DS1836C-20 supervisor works by monitoring the voltage level (VCC) of the system using an internal comparator. When the VCC voltage is equal to or above the Sync Voltage (VS) or power-up threshold (TLV), the PGOOD output is active (high) and the reset output is inactive (low). When the VCC voltage drops below the reset threshold (TH) or reset-back threshold (THB), the PGOOD output goes inactive (low) and the reset outout is active (high). The device\'s reset-back window is typically ± 0.5 V, allowing the device to reset itself with minimal power consumption.

The DS1836C-20 has many highly advanced features, such as an integrated over-voltage detection (OVD) circuit and an integrated under-voltage lockout (UVLO) circuit. The OVD circuit will delay reset until an excessive input voltage is present. The UVLO circuit will delay reset when the input voltage is below a predetermined threshold. The device is also capable of automatically resetting itself into normal operation once the voltage fault has cleared.

The DS1836C-20 also provides programmable reset assertion/deassertion delays and programmable reset pulse width. The reset assertion/deassertion delay settings can be used to ensure that all parts of the system execute meaningful code before reset is deasserted. The reset pulse width settings can be used to ensure that all parts of the system are reset properly.

Conclusion

The DS1836C-20 is a highly integrated, 20-mA push-pull mini-supervisor that provides fault protection for a wide variety of systems. It features a push-pull reset and power-good outputs and has integrated OVP and UVLO protection. It also provides programmable reset assertion/deassertion delays and reset pulse widths, allowing the device to be used in a wide range of applications. This makes it an excellent choice for power management in many portable, industrial, automotive and computer systems.

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