LTC2911IDDB-3

Series:	--
Part Status:	Obsolete
Type:	Multi-Voltage Supervisor
Number of Voltages Monitored:	3
Output:	Push-Pull, Totem Pole
Reset:	Active Low
Reset Timeout:	Adjustable/Selectable
Voltage - Threshold:	1.683V, 3.086V, Adj
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	8-WFDFN Exposed Pad
Supplier Device Package:	8-DFN (3x2)

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• Introduction

The LTC2911IDDB-3 is a comprehensive power management integrated circuit (PMIC) that was developed by Linear Technology Corporation. It is part of the company’s supervisor family. The device is a digital core power supply supervisor with advanced power monitoring and control functions.

• Detailed Introduction

The family of supervisors includes LTC1981, LTC2931 and LTC2911 which have features such as adjustable over and under voltage protection, programmable current limit, power-on reset and programmable power-good (pg) timing. The LTC2911IDDB-3 is capable of monitoring and controlling additional power rails such as 3.3V and 2.5V. Additionally, it provides a logical 1 PGOOD output that is programmable up to five ms.The LTC2911IDDB-3 supervises three different logic power supplies. It senses over-voltage thermal shutdown and short-circuit conditions for each product. It offers adjustable current, voltage and temperature limiting as well as sequencing and sequencing performance counters. The device supports digital power-on reset and can deliver a power-on pulse to other system ICs. It is available in a 16-pin TSSOP (Thermal-Enhanced Super Small Outline Package) package.

• Principle of Working

The LTC2911IDDB-3 supervisor is built around a single control loop and a digital timing block. The digital block samples the power rails at around 50 kHz and then takes the appropriate actions based on the parameters configured. The digitally controlled loop synchronizes the output power rails and sequences them one at a time.The device has an on-chip thermal sensor which monitors its own temperature as well as the temperature of other devices in the system. The device will take necessary actions as per the temperature readings. On-chip current monitoring enables the device to detect and react to over-current and short-circuit events.The LTC2911IDDB-3 comes with configurable over and under-voltage protections which the user can customize as per their requirements. The device has a fault-log configurable with reset masks, interrupt masks and programmable trip thresholds. It also comes with programmable PG (power-good) delay which provides the user an additional layer of protection as it allows the power supply to settle before engaging other system ICs.

• Applications

The LTC2911IDDB-3 supervisor is most commonly used in high end computing and automation systems. It’s a reliable, cost-effective solution for monitoring power rails in both single- and multiple-rail applications. The device is designed to be used with processors that require precise voltage and current control.The LTC2911IDDB-3 can also be used in home appliances, consumer electronics, office equipment, telecommunications and automotive systems. It is specifically well suited for 3.3V and 2.5V power supply voltage rails in portable consumer devices such as smart phones and tablets. It can also be used in applications demanding power sequencing like PC power supplies, monitor power boards and set-top boxes.

• Conclusion

The LTC2911IDDB-3 is a comprehensive digital power supply supervisor from Linear Technology Corporation. It offers a wide variety of features such as adjustable over and under-voltage protection, current limit and power-on reset. The device also features on-chip thermal monitoring and power-good delay. The LTC2911IDDB-3 is designed for use in high end computing and automation systems. It is particularly well suited for monitoring 3.3V and 2.5V power rails in portable consumer devices. Additionally, it is suitable for applications that require precise power sequencing.

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