LTC2927IDDB#TRPBF

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: Programmable Voltage Supervisor and Sequencer
• Package: 8-Lead DFN (Dual Flat No-Lead)
• Essence: Provides voltage monitoring, sequencing, and reset generation for multiple power supplies in a system.
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Operating Temperature Range: -40°C to +85°C
• Number of Supervisors: 4
• Adjustable Reset Timeout Delay: 1ms to 10s
• Output Type: Active Low, Open Drain
• Fault Detection Threshold Accuracy: ±1.5%
• Quiescent Current: 20µA (typical)

Pin Configuration

The LTC2927IDDB#TRPBF has the following pin configuration:

1. GND: Ground
2. RESET1: Reset Output for Channel 1
3. RESET2: Reset Output for Channel 2
4. RESET3: Reset Output for Channel 3
5. RESET4: Reset Output for Channel 4
6. VCC: Supply Voltage Input
7. SENSE: Voltage Sense Input
8. GATE: Gate Control Input

Functional Features

• Voltage Monitoring: Monitors the input voltage and generates a reset signal if it falls below a programmable threshold.
• Voltage Sequencing: Allows for controlled power-up and power-down sequences of multiple power supplies.
• Reset Generation: Generates active low reset signals for each channel when a fault condition is detected.
• Adjustable Reset Timeout: Provides flexibility in setting the timeout delay for the reset signal.
• Fault Detection: Accurately detects faults in the monitored voltages with high precision.
• Low Quiescent Current: Consumes minimal current during operation, ensuring power efficiency.

Advantages and Disadvantages

Advantages: - Provides comprehensive voltage monitoring and sequencing capabilities. - Programmable reset timeout allows customization for different applications. - Accurate fault detection ensures reliable system operation. - Low quiescent current minimizes power consumption.

Disadvantages: - Limited to 4 channels of voltage monitoring and sequencing. - Requires external components for proper operation. - May not be suitable for applications requiring a higher number of channels.

Working Principles

The LTC2927IDDB#TRPBF operates by continuously monitoring the input voltages through the SENSE pins. It compares the sensed voltages with the programmable threshold levels and generates reset signals accordingly. The reset signals are active low and open drain, allowing easy interfacing with other devices.

The device also provides voltage sequencing functionality, enabling controlled power-up and power-down sequences for multiple power supplies. This ensures that critical power rails are properly initialized before others, preventing potential damage or instability.

Additionally, the adjustable reset timeout feature allows users to set the duration for which the reset signal remains active after a fault condition is detected. This flexibility accommodates various system requirements and ensures proper recovery from faults.

Detailed Application Field Plans

The LTC2927IDDB#TRPBF finds applications in various fields, including:

1. Industrial Control Systems: Provides voltage monitoring and sequencing for critical components in industrial control systems, ensuring proper power management and system reliability.
2. Telecommunications Equipment: Enables controlled power-up and power-down sequences for telecom equipment, preventing voltage spikes and ensuring smooth operation.
3. Automotive Electronics: Monitors and sequences power supplies in automotive electronics, enhancing safety and performance.
4. Medical Devices: Ensures reliable power management in medical devices, preventing potential failures and ensuring patient safety.
5. Data Centers: Facilitates proper power sequencing in data centers, preventing power surges and optimizing system performance.

Detailed and Complete Alternative Models

1. LTC2926IDDB#TRPBF: Similar to LTC2927IDDB#TRPBF but with 6 channels of voltage monitoring and sequencing.
2. LTC2928IDDB#TRPBF: Similar to LTC2927IDDB#TRPBF but with 8 channels of voltage monitoring and sequencing.
3. LTC2929IDDB#TRPBF: Similar to LTC2927IDDB#TRPBF but with additional features such as adjustable power-on reset delay and watchdog timer functionality.

These alternative models offer similar functionality with varying channel counts and additional features to cater to different application requirements.

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