Overview
The LT8708EUHG#TRPBF is a high-performance buck-boost switching regulator controller produced by Analog Devices Inc. This component is designed to operate with input voltages that can be above, below, or equal to the output voltage, making it versatile for various applications. It features bidirectional power conversion capabilities, which are particularly useful in battery/capacitor backup systems and other applications requiring regulation of output voltage, input voltage, output current, and input current.
The LT8708EUHG#TRPBF supports multiple conduction modes, including discontinuous conduction mode (DCM), continuous conduction mode (CCM), hybrid conduction mode (HCM), and Burst Mode operation. The device also includes independent current limits for forward and reverse currents on both the input and output sides, which can be set using resistors on the PCB.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Input Voltage Range | 2.8 | - | 80 | V |
| Output Voltage Range | 1.3 | - | 80 | V |
| INTVCC Regulator Dropout Voltage | 220 | - | - | mV |
| LDO33 Pin Voltage | 3.23 | 3.295 | 3.35 | V |
| LDO33 Pin Load Regulation | -0.25 | -1 | - | % |
| SHDN Pin Bias Current (VSHDN = 3V) | 0 | 14 | 22 | μA |
| SWEN Rising Threshold Voltage | 1.156 | 1.208 | 1.256 | V |
| MODE Pin Continuous Conduction Mode (CCM) Threshold | 0.4 | - | - | V |
| MODE Pin Hybrid DCM/CCM Mode (HCM) Range | 0.8 | - | 1.2 | V |
| MODE Pin Discontinuous Conduction Mode (DCM) Range | 1.6 | - | 2.0 | V |
| MODE Pin Burst Mode Operation Threshold | 2.4 | - | - | V |
Key Features
- Bidirectional Power Conversion: The LT8708EUHG#TRPBF supports bidirectional power conversion, making it suitable for battery/capacitor backup systems and other applications requiring regulation of VOUT, VIN, IOUT, and/or IIN.
- Multiple Conduction Modes: The device operates in discontinuous conduction mode (DCM), continuous conduction mode (CCM), hybrid conduction mode (HCM), and Burst Mode operation.
- Independent Current Limits: Forward and reverse current limits for both input and output sides can be set independently using four resistors on the PCB.
- Wide Input and Output Voltage Range: The component can handle input voltages from 2.8V to 80V and output voltages from 1.3V to 80V.
- Automotive Grade: Versions with controlled manufacturing for automotive applications are available, designated with a #W suffix.
- Synchronous Rectification: Up to 98% efficiency is achievable due to synchronous rectification.
Applications
- Solar Systems: Suitable for solar power systems due to its wide input voltage range and bidirectional capabilities.
- Automotive Systems: Used in automotive applications, especially with versions designated for automotive reliability (#W suffix).
- Telecom Systems: Applicable in telecommunications equipment requiring high efficiency and flexible voltage regulation.
- Battery-Powered Systems: Ideal for battery-powered systems, including battery/capacitor backup systems.
- Consumer Electronics: Used in various consumer electronics requiring efficient and reliable power management.
Q & A
- What is the input voltage range of the LT8708EUHG#TRPBF?
The input voltage range is from 2.8V to 80V.
- What are the different conduction modes supported by the LT8708EUHG#TRPBF?
The device supports discontinuous conduction mode (DCM), continuous conduction mode (CCM), hybrid conduction mode (HCM), and Burst Mode operation.
- How can the current limits be set on the LT8708EUHG#TRPBF?
The forward and reverse current limits for both input and output sides can be set independently using four resistors on the PCB.
- What is the output voltage range of the LT8708EUHG#TRPBF?
The output voltage range is from 1.3V to 80V.
- Is the LT8708EUHG#TRPBF suitable for automotive applications?
Yes, versions designated with a #W suffix are available for automotive applications, ensuring the quality and reliability required for such use.
- What is the efficiency of the LT8708EUHG#TRPBF due to synchronous rectification?
The device can achieve up to 98% efficiency due to synchronous rectification.
- How can the direction of power flow be controlled in the LT8708EUHG#TRPBF?
The direction of power flow can be controlled using the DIR (direction) pin, allowing power to flow only from VIN to VOUT or only from VOUT to VIN.
- What is the purpose of the MODE pin in the LT8708EUHG#TRPBF?
The MODE pin is used to select between different conduction modes such as DCM, CCM, HCM, and Burst Mode operation.
- What is the significance of the LDO33 pin in the LT8708EUHG#TRPBF?
The LDO33 pin provides a regulated voltage output, with a typical voltage of 3.295V and load regulation from 0.1mA to 5mA.
- How does the LT8708EUHG#TRPBF ensure reliability in its operation?
The device includes various features such as undervoltage lockout, current limits, and thermal management to ensure reliable operation.
