LTC2927ITS8#TRPBF

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: Programmable Voltage Supervisor and Sequencer
• Package: 8-Lead ThinSOT
• Essence: Provides power supply monitoring and sequencing functions in various applications
• Packaging/Quantity: Tape & Reel, 3000 units per reel

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Output Current: 10mA
• Quiescent Current: 20µA
• Number of Outputs: 3
• Adjustable Threshold Voltage Range: 0.4V to 5V
• Fault Detection Timeout: 1ms to 64s
• Power-On Reset Timeout: 200ms
• Watchdog Timer Timeout: 6.4s
• Power Good Delay: 200ms

Detailed Pin Configuration

The LTC2927ITS8#TRPBF has the following pin configuration:

1. GND: Ground
2. VCC: Supply Voltage Input
3. RESET: Active-Low Reset Output
4. PWRGD: Power Good Output
5. WDI: Watchdog Timer Input
6. FAULT: Fault Output
7. SEQ: Sequencing Output
8. VTH: Threshold Voltage Adjustment Input

Functional Features

1. Power Supply Monitoring: Monitors the voltage levels of multiple power supplies.
2. Power Sequencing: Controls the sequence in which different power supplies turn on/off.
3. Programmable Threshold Voltage: Allows adjustment of the threshold voltage for fault detection.
4. Fault Detection Timeout: Detects faults and triggers a fault output after a specified timeout period.
5. Power-On Reset: Generates a reset signal upon power-up or when the supply voltage falls below a specified threshold.
6. Watchdog Timer: Monitors system activity and generates a reset signal if no activity is detected within a specified timeout period.
7. Power Good Output: Indicates when all power supplies are within their specified voltage range.
8. Sequencing Output: Provides a signal indicating the current power supply sequence.

Advantages and Disadvantages

Advantages: - Flexible and programmable voltage monitoring and sequencing capabilities - Wide supply voltage range allows compatibility with various systems - Low quiescent current for power-efficient operation - Small package size for space-constrained applications

Disadvantages: - Limited number of outputs (3) - Requires external components for proper operation

Working Principles

The LTC2927ITS8#TRPBF operates by continuously monitoring the voltage levels of multiple power supplies. It compares these voltages to a programmable threshold voltage, which can be adjusted using the VTH pin. If any of the monitored voltages fall outside the specified range, a fault output is triggered after a user-defined timeout period.

The device also provides power sequencing functionality, ensuring that different power supplies turn on/off in a specific order. The sequencing output indicates the current power supply sequence.

Additionally, the LTC2927ITS8#TRPBF features a power-on reset circuit that generates a reset signal upon power-up or when the supply voltage falls below a certain threshold. A watchdog timer monitors system activity and generates a reset signal if no activity is detected within a specified timeout period.

Detailed Application Field Plans

The LTC2927ITS8#TRPBF is widely used in various applications where power supply monitoring and sequencing are critical. Some common application fields include:

1. Embedded Systems: Ensures proper power-up and shutdown sequences in microcontroller-based systems.
2. Industrial Automation: Monitors and controls the power supply sequence in industrial control systems.
3. Telecommunications: Provides voltage supervision and sequencing in telecom equipment.
4. Automotive Electronics: Ensures reliable power supply management in automotive electronic systems.
5. Medical Devices: Monitors and sequences power supplies in medical equipment for patient safety.

Detailed and Complete Alternative Models

1. LTC2926ITS8#TRPBF: Similar to LTC2927ITS8#TRPBF but with 2 outputs instead of 3.
2. LTC2928ITS8#TRPBF: Programmable Voltage Supervisor and Sequencer with 4 outputs.
3. LTC2929ITS8#TRPBF: Advanced version with additional features such as adjustable power-on reset timeout and watchdog timer disable option.

These alternative models offer similar functionality to the LTC2927ITS8#TRPBF but with varying output configurations and additional features.

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