Overview
The LTC4040EUFD#TRPBF is a comprehensive 2.5A battery backup power manager produced by Analog Devices Inc. This device is designed to provide a complete 3.5V to 5.5V supply rail battery backup system, incorporating a high current step-up DC/DC regulator. It is particularly useful in applications where reliable power backup is crucial, ensuring continuous operation during power failures or battery depletion.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Input Voltage Range | 3.5 | 5.5 | V | |
| Output Current | 2.5 | A | ||
| Step-Down (Buck) Converter Switching Frequency | 1.96 | 2.25 | 2.65 | MHz |
| High Side Switch On-Resistance (Normal Mode) | 130 | mΩ | ||
| Low Side Switch On-Resistance (Normal Mode) | 120 | mΩ | ||
| PMOS Switch Current Limit | 3 | 4.3 | A | |
| Logic Low Input Voltage | 0.4 | V | ||
| Logic High Input Voltage | 1.2 | V | ||
| Operating Junction Temperature Range | -40 | 125 | °C | |
| Package Type | 24-Lead QFN (4mm × 5mm × 0.75mm) |
Key Features
- Complete 3.5V to 5.5V supply rail battery backup system
- High current step-up DC/DC regulator for battery backup
- Low profile 24-lead QFN package (4mm × 5mm × 0.75mm)
- Operating junction temperature range: -40°C to 125°C
- End-of-charge indication and bad-battery termination
- Programmable charge current and charge termination voltage
Applications
- Fleet and asset tracking systems
- Automotive GPS data loggers
- Automotive telematics systems
- Toll collection systems
- Security systems
- USB powered devices
Q & A
- What is the primary function of the LTC4040EUFD#TRPBF? The primary function is to provide a complete 3.5V to 5.5V supply rail battery backup system using a high current step-up DC/DC regulator.
- What is the maximum output current of the LTC4040EUFD#TRPBF? The maximum output current is 2.5A.
- What is the switching frequency of the step-down (buck) converter? The switching frequency ranges from 1.96 MHz to 2.65 MHz.
- What is the operating junction temperature range of the LTC4040EUFD#TRPBF? The operating junction temperature range is -40°C to 125°C.
- What type of package does the LTC4040EUFD#TRPBF come in? It comes in a 24-lead QFN package (4mm × 5mm × 0.75mm).
- What are some common applications of the LTC4040EUFD#TRPBF? Common applications include fleet and asset tracking, automotive GPS data loggers, automotive telematics systems, toll collection systems, security systems, and USB powered devices.
- How does the LTC4040EUFD#TRPBF indicate the end of charge? It provides an end-of-charge indication through the PROG pin average voltage.
- Can the charge current be programmed in the LTC4040EUFD#TRPBF? Yes, the charge current can be programmed.
- What happens when the battery voltage falls below a certain threshold? The device initiates bad-battery termination when the battery voltage falls below the specified threshold (VLOWBAT - ΔVLOWBAT).
- Where can I find more detailed specifications and documentation for the LTC4040EUFD#TRPBF? Detailed specifications and documentation can be found on the official Analog Devices website and through distributors like Digi-Key, Mouser, and Farnell.
