Overview
The LTC3789EUFD#TRPBF, produced by Analog Devices Inc., is a high-performance, synchronous 4-switch buck-boost switching regulator controller. This device is designed to operate from input voltages that can be above, below, or equal to the output voltage, making it highly versatile for various power management applications. The LTC3789 employs a proprietary topology and control architecture, utilizing a current-sensing resistor to control the inductor current. The device features an internal 5.5V low dropout (LDO) regulator and supports both internal and external power supply configurations for the MOSFET drivers and other internal circuitry.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| VIN (Input Supply Voltage) | 4 | 38 | V | ||
| VOUT (Output Voltage) | 0.8 | 38 | V | ||
| VFB (Regulated Feedback Voltage) | ITH Voltage = 1.2V, TA = –40°C to 85°C | 0.788 | 0.800 | 0.812 | V |
| IFB (Feedback Current) | -15 | -50 | nA | ||
| VREFLNREG (Reference Voltage Line Regulation) | VIN = 4V to 38V | 0.002 | 0.02 | %/V | |
| VLOADREG (Output Voltage Load Regulation) | Measured in Servo Loop, ∆ITH Voltage = 1.4V to 2V | 0.01 | 0.1 | V | |
| IPGOOD (PGOOD Trip Level) | VFB with Respect to Set Output Voltage | -10 | 10 | % |
Key Features
- High Efficiency: The LTC3789 offers high efficiency across buck, boost, and buck-boost operating modes.
- Wide Input Range: Operates from input voltages between 4V and 38V, making it suitable for a variety of power sources.
- Internal and External Power Supply Options: The device can use an internal 5.5V LDO regulator or an external voltage supply for the MOSFET drivers and other internal circuitry.
- Current Mode Control: Employs current mode control architecture with a current-sensing resistor to regulate the inductor current.
- PGOOD Indicator: Features a power good (PGOOD) indicator that signals when the output voltage is within the specified range).
Applications
- Industrial Power Systems: Suitable for industrial power supplies requiring high efficiency and wide input voltage ranges.
- Automotive Systems: Ideal for automotive applications where input voltage can vary significantly.
- Renewable Energy Systems: Can be used in solar, wind, and other renewable energy systems to manage variable input voltages.
- Battery-Powered Devices: Useful in battery-powered devices that require efficient power management across different battery states.
Q & A
- What is the input voltage range of the LTC3789?
The input voltage range of the LTC3789 is from 4V to 38V.
- What are the output voltage capabilities of the LTC3789?
The LTC3789 can produce output voltages ranging from 0.8V to 38V.
- What is the feedback current range of the LTC3789?
The feedback current range is typically between -15 nA and -50 nA.
- Does the LTC3789 support both internal and external power supply configurations?
Yes, the LTC3789 can use either an internal 5.5V LDO regulator or an external voltage supply for the MOSFET drivers and other internal circuitry.
- What is the purpose of the PGOOD indicator in the LTC3789?
The PGOOD indicator signals when the output voltage is within the specified range.
- What are the operating temperature ranges for the LTC3789?
The LTC3789E is guaranteed to meet performance specifications from 0°C to 85°C, while the LTC3789I operates over the full –40°C to 125°C range.
- What type of control architecture does the LTC3789 use?
The LTC3789 employs a current mode control architecture.
- Is the LTC3789 suitable for automotive applications?
Yes, the LTC3789 is suitable for automotive applications due to its wide input voltage range and high efficiency.
- Can the LTC3789 be used in renewable energy systems?
Yes, it can be used in renewable energy systems to manage variable input voltages efficiently.
- What is the packaging type for the LTC3789EUFD#TRPBF?
The LTC3789EUFD#TRPBF is packaged in a QFN-28-EP (4x5) package and is available in Tape & Reel (TR), Cut Tape (CT), and Digi-Reel® formats.
