LTC2925CUF#TRPBF

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LTC2925CUF#TRPBF is a three-terminal USB/AC supply sequencer, monitor, undervoltage detector and overvoltage detector integrated circuit (IC). It is part of the PMIC – Power Supply Controllers, Monitors family from Linear Technology. The device is ideal for applications that involve powering multiple load levels from a power source. It provides the sequencing and protection needed for many applications such as USB/AC sequencer, undervoltage/overvoltage protection, system power sequencing and so on.

The LTC2925CUF#TRPBF IC features an On/Off control pin, three voltage monitor inputs and three programmable sleep low voltage detection thresholds. It is powered from a supply voltage range from 3V to 5V and consumes a typical operating current of 2.0μA. The device contains two voltage monitor outputs, one Open Drain PGOOD output and one Open Drain PGOOD output with a callback output delay. The PGOOD output has an additional handshaking feature that is designed to allow system power monitoring.

For a better understanding of the application field and working principle of the LTC2925CUF#TRPBF IC, let us take a look at its internal architecture. The device comprises two digitally-controlled current sources monitored by two comparators. The internal architecture of the IC contains a supply voltage monitor with two programmable thresholds (which act as an overvoltage protection) and a Low Voltage Monitor (LVM) with three programmable thresholds (which act as an undervoltage protection). When the thresholds of the voltage monitors are tripped, the related PGOOD output is switched off, disabling any further power up sequences.

In addition, the LTC2925CUFT#TRPBF device also features a low current power-up sequence. This sequence is used to ensure that the outputs are enabled in an orderly manner, after the power source has been turned on. The power-up sequence has three types of output – a normal/slow/fast sequence, depending on the state of the On/Off control pin and the voltage monitor inputs. The normal output is chosen when all the voltage monitors are below their respective undervoltage detection threshold. The slow output is chosen when one of the voltage monitors is below its respective undervoltage detection threshold while the other two are above the same. The fast output is chosen when all the voltage monitors are above their respective undervoltage detection threshold.

Moreover, the LTC2925CUF#TRPBF device also offers a low power shutdown mode which is especially useful when the system needs to remain in a low power state for an extended period of time. The low power shutdown mode is enabled when the On/Off control pin is pulled high, and the corresponding PGOOD outputs are set low. The device can be enabled again, by bringing the control pin low.

To sum up, the LTC2925CUF#TRPBF integrated circuit can be used in a range of applications that require power sequencing and protection while using a power source such as USB/AC. It comprises two digitally-controlled current sources monitored by two comparators, and the internal architecture of the IC contains a voltage monitor with programmable thresholds for overvoltage and undervoltage protection, as well as a power-up sequence for enabling the outputs in an orderly manner. The device offers a low power shutdown mode as well as an additional handshaking feature for power monitoring. It is available in an easy to use surface mount packaging, and is suitable for use in applications that rely on extreme power efficiency, accuracy and reliability.

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