Overview
The LTC3779EFE#PBF is a high-performance buck-boost switching regulator controller produced by Analog Devices Inc. This controller is designed to operate from input voltages that can be above, below, or equal to the output voltage, making it highly versatile for various applications. It features a constant frequency current mode architecture with a phase-lockable frequency of up to 600kHz, which is particularly useful for noise-sensitive applications and battery charging systems.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| VIN Input Supply Operating Voltage Range | 4.5 | 150 | V | ||
| VOUT Output Supply Operating Voltage Range | 1.2 | 150 | V | ||
| Regulated Feedback Voltage | ITH Voltage = 1.4V | 1.188 | 1.2 | 1.212 | V |
| Transition Time: Rise Time, Fall Time | VDRVCC = 9V, CLOAD = 3300pF | 60 | ns | ||
| PGOOD Trip Level | VFB with Respect to Set Regulated Voltage | 5.5 ±1 µA | |||
| Operating Junction Temperature Range | -40 | 125 (or 150 for LTC3779H) | °C |
Key Features
- Synchronous 4-switch buck-boost architecture allowing seamless transfers between operating regions.
- Precision 1.2V reference and power good output indicator.
- MODE pin for selecting between pulse-skipping mode or forced continuous mode of operation.
- PLLIN pin for synchronization to an external clock.
- High efficiency at light load due to pulse-skipping mode.
- Constant frequency operation for noise-sensitive applications in forced continuous mode.
Applications
The LTC3779EFE#PBF is ideal for various applications including:
- Automotive systems.
- Telecom systems.
- Battery-powered systems.
- Noise-sensitive applications requiring constant frequency operation.
Q & A
- What is the input voltage range of the LTC3779EFE#PBF?
The input voltage range is from 4.5V to 150V. - What is the output voltage range of the LTC3779EFE#PBF?
The output voltage range is from 1.2V to 150V. - What is the phase-lockable frequency of the LTC3779EFE#PBF?
The phase-lockable frequency is up to 600kHz. - What are the operating modes of the LTC3779EFE#PBF?
The controller can operate in pulse-skipping mode or forced continuous mode. - What is the purpose of the PLLIN pin on the LTC3779EFE#PBF?
The PLLIN pin allows the IC to be synchronized to an external clock. - What are the typical applications of the LTC3779EFE#PBF?
Typical applications include automotive, telecom, and battery-powered systems. - What is the precision of the feedback voltage reference?
The precision feedback voltage reference is 1.2V. - How does the LTC3779EFE#PBF handle noise-sensitive applications?
It operates in forced continuous mode for constant frequency, which is beneficial for noise-sensitive applications. - What is the operating junction temperature range for the LTC3779EFE#PBF?
The operating junction temperature range is from -40°C to 125°C (or 150°C for the LTC3779H version). - What is the significance of the PGOOD output indicator?
The PGOOD (Power Good) output indicator signals when the output voltage is within the regulated range.
