LTC2911HTS8-3

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LTC2911HTS8-3 is a precision voltage supervisor developed by Linear Technology Corporation, a world-renowned PMIC provider. It is widely used in power infrastructure design, such as laptops, servers, automotive, embedded system and many other applications where voltage monitoring by low power dissipation is required. The main advantages of these devices are reliable, fixed threshold accuracy and low standby current. LTC2911HTS8-3 is well-suited for both power-up and power-down applications, setting it apart from other supervisors.

The main task of the LTC2911HTS8-3 is monitoring the supply voltage. It can be configured as both supply-independent and supply-dependent voltage supervisor. Supply-independent monitoring requires connecting a single voltage sense pin to the voltage source, while supply-dependent monitoring requires connecting two voltage sense pins from the supply source and from the load.

When the voltage level reaches one of the set threshold levels, the device asserts its main reset or reset/enable pin. This action is meant to respond to out-of-range conditions, such as overvoltage or undervoltage. Dependent on the application configuration, the device will start an internal count down timer upon assertion, allowing the designer to define a response time that could stretched up to a maximum of 256 seconds, thus providing enough time to save critical data before shutting the system down.

The LTC2911HTS8-3 device is also capable of power-up/power-down control and voltage sequencing. The device has two output control pins, OUT1 and OUT2, which can be assigned either as manual reset or power-up/power-down control signals. The OUT1 has two modes, manual reset or power-up/power-down control, while OUT2 only has manual reset mode. The voltage sequence settings are configured digitally via the I2C port which is used to program the device.

The LTC2911HTS8-3 does incorporate several detection algorithms for improved accuracy, such as thermal compensation and Hysteresis for high temperature applications. Additionally, the device measures its own temperature via either an external diode, or an internal die temperature sensor, allowing the user to alert of abnormal operations at high temperatures.

The device is also complemented by several protection circuits, such as reverse current protection, brownout detection, and detection of crowbar conditions. The reverse current protection feature prevents the device from supplying current from the output pin, thus avoiding possible damages from inversion of the supply and load. The brownout protection feature detects when the system voltage is lower than the specified threshold, and triggers a power-down sequence. Finally, the crowbar protection feature detect possible overvoltages, triggering a reset immediately.

The user can also tweak the behavior of the supervisor by programming several timeout features. The Power-Up and Power-Down Timeout features set the time required for the voltage to reach the set threshold. Additionally, the User Delay features allow the user to define a verifiable time period before the main reset or reset/enable pin is asserted.

Overall, the LTC2911HTS8-3 is a very useful device, allowing the designer to define power sequences, voltage monitoring, and protection in a very cost-effective manner. It is a very attractive device for embedded systems, automotive and industrial applications, where an extensive voltage monitoring system is necessary.

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