MAX6345SUT+

Performance of a system can significantly depend on the power supplies and the related components used in it. This is why selecting the right power management IC (PMIC) is important to many applications. The MAX6345SUT+ is a supervisor IC from Maxim Integrated that has found application in a variety of embedded systems. This article explores the features, application field, and working principle of the MAX6345SUT+.

Features of MAX6345SUT+

The MAX6345SUT+ is an advanced supervisor IC and features programmable reset thresholds, adjustable reset delay, independent power-supply monitors, and two-wire circuit in addition to a low active-high reset output. The IC enables I2C communication and allows the user to configure the reset threshold, reset delay, output voltage, and fault status without disconnecting the part from the system. The adjustable reset delay can range from 10µS to 3S along with the adjustable reset threshold of 2.7V to 5.5V.

The MAX6345SUT+ comes in an ultra-compact 0.86mm x 0.71mm WLP package, with an operating temperature range of -40°C to +125°C. The device is configured for a broad supply voltage range of 2.5V to 5.5V and is filtered for electrical noise. The IC can be controlled manually via the pushbutton connected to POR (power up reset) or controlled by on-chip running system software. It provides a power-fail comparator with a manual reset and hard reset option.

Application Field of MAX6345SUT+

The MAX6345SUT+ is typically used in a variety of embedded systems such as industrial automation, medical device, lighting and home appliance control systems. Other applications include application processor-based systems and power supplies in smart TV, networking, and telecommunication systems. Additionally, the IC can also be used in portable computing and low-power removable media devices such as PDAs, phones and memory cards.

The IC can find application in automotive systems due to its features of configurability and reset threshold adjustable control. With its in-built, two-wire serial bus support, the IC can be used in automotive electronics to deliver signal or power supply with multiple system functions. The low active-high reset output is also effective in automotive monitoring and control applications.

Working Principle of MAX6345SUT+

The MAX6345SUT+ is a 3-step power-on-reset supervisor IC which monitors the supply voltage of the system and provides reset signal output when it falls below the preset threshold. If the voltage is below the VLTSET threshold, the reset process is triggered. The reset signal is delivered for the duration set by the RTIME parameter, and the system is resumed to its normal operation when the supply voltage reaches its nominal voltage.

The IC has an in-built supervisor circuit that includes multiple slave reset circuits that divide the reset signal into smaller Pulse Width Modulator (PWM) signals with adjustable pulse widths using RTIME. The RTIME parameter can be programmed using external capacitors or resistors to adjust the de-assert threshold of POR signal. This allows the user to adjust the reset delay without disconnecting the IC from the system.

Additionally, the MAX6345SUT+ has an adjustable output voltage with a range of 2.7V to 5.5V with an accuracy of ± 0.5%, which eliminates the need of using external voltage regulators. It supports clock output of 200kHz to 2MHz and a maximum frequency of 16MHz for the I2C interface. The IC also includes a comprehensive set of control registers for configuring various system parameters.

Conclusion

The MAX6345SUT+ is an advanced supervisor IC from Maxim Integrated that is suitable for a range of embedded systems and automotive electronics. It has a wide operating temperature range and comes in an ultra-compact WLP package. The device offers adjustable reset delay, adjustable output voltage, programmable reset thresholds, and independent power supply monitors. The MAX6345SUT+ also supports two-wire serial bus communication which enables users to configure various parameters without disconnecting the IC.