LTC2921IGN-3.3#PBF

Product Overview

Category: Integrated Circuit (IC)

Use: Voltage Supervisor and Sequencer

Characteristics: - Monitors multiple power supply voltages - Provides power-on reset signals - Controls power sequencing - Low quiescent current - Wide operating voltage range

Package: 16-Lead SSOP (Shrink Small Outline Package)

Essence: The LTC2921IGN-3.3#PBF is an integrated circuit designed to monitor and control power supply voltages in electronic systems. It ensures proper power sequencing and provides power-on reset signals, enhancing the reliability and stability of the system.

Packaging/Quantity: The LTC2921IGN-3.3#PBF is available in a 16-Lead SSOP package. It is typically sold in reels or tubes containing a specific quantity of units.

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Operating Temperature Range: -40°C to 85°C
• Quiescent Current: 20µA (typical)
• Power-On Reset Threshold Accuracy: ±1.5%
• Power Sequencing Time Delay: Programmable
• Output Voltage: 3.3V

Pin Configuration

The LTC2921IGN-3.3#PBF has a total of 16 pins. Here is the detailed pin configuration:

1. VCC: Supply Voltage Input
2. GND: Ground
3. RESET: Active-Low Reset Output
4. PGOOD: Power Good Output
5. SEQ: Sequencing Control Input
6. EN: Enable Input
7. V1, V2, V3, V4: Voltage Monitor Inputs
8. G1, G2, G3, G4: Ground Connections
9. VCC1, VCC2: Additional Supply Voltage Inputs
10. VOUT: Output Voltage

Functional Features

• Monitors up to four power supply voltages simultaneously
• Generates a power-on reset signal when all monitored voltages are within the specified range
• Provides a power good signal indicating that all monitored voltages are within the acceptable limits
• Allows programmable power sequencing of multiple voltage supplies
• Low quiescent current consumption, minimizing power dissipation
• Wide operating voltage range enables compatibility with various systems

Advantages and Disadvantages

Advantages: - Efficient monitoring and control of multiple power supply voltages - Enhances system reliability by ensuring proper power sequencing - Low power consumption - Wide operating voltage range for compatibility

Disadvantages: - Limited to monitoring and sequencing up to four power supply voltages - Requires additional external components for complete functionality

Working Principles

The LTC2921IGN-3.3#PBF operates by continuously monitoring the input voltages connected to its voltage monitor inputs (V1-V4). It compares these voltages against internally set thresholds to determine if they are within the acceptable range. If all monitored voltages are within the specified range, the device generates a power-on reset signal (RESET) and a power good signal (PGOOD).

The sequencing control input (SEQ) allows the user to program the desired power-up sequence of the voltage supplies. This feature ensures that certain voltages are powered up before others, preventing potential issues caused by improper power sequencing.

The enable input (EN) can be used to enable or disable the functionality of the LTC2921IGN-3.3#PBF. When disabled, the device consumes minimal power.

Detailed Application Field Plans

The LTC2921IGN-3.3#PBF finds applications in various electronic systems where reliable power supply monitoring and sequencing are crucial. Some potential application fields include:

1. Microcontroller Systems: Ensuring proper power sequencing and reliable operation of microcontrollers.
2. Communication Equipment: Monitoring and controlling power supply voltages in networking devices, routers, and switches.
3. Industrial Automation: Enhancing the stability and reliability of power supplies in industrial control systems.
4. Automotive Electronics: Providing voltage supervision and sequencing for automotive electronic systems.

Detailed and Complete Alternative Models

1. LTC2920IGN-3.3#PBF: Similar to LTC2921IGN-3.3#PBF but with a different pin configuration.
2. MAX16050AUT+T: Voltage supervisor and sequencer with similar features and functionality.
3. TPS3890QPW: Integrated circuit offering power-on reset and sequencing capabilities.

These alternative models provide similar functionalities to the LTC2921IGN-3.3#PBF and can be considered as alternatives based on specific system requirements.

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