LTC7851IUHH#PBF Datasheet/PDFLTC7851IUHH#PBF Application Field and Working Principle
The LTC7851IUHH#PBF is a dual-channel Pulse-Width Modulation (PWM) Switching Controller, categorized under PMIC – Voltage Regulators – DC DC Switching Controllers. It contains an optimized power conversion architecture, designed for high performance and cost-sensitive applications. As a DC-DC switching regulator, the device converts input voltage to different output voltages through precise switching. This device operates efficiently over a wide input voltage and output voltage range.
Working Principle
The LTC7851IUHH#PBF is a DC–DC switching regulator that operates by shedding peak current as conditional to its target voltage input. This current shedding is executed by utilizing an external P-channel power MOSFET with switching logic provided by the device. The device has two independent channels (A and B) that can be independently adjusted, allowing different voltage configurations on the output.
The LTC7851IUHH#PBF can operate in both constant-current and constant-voltage mode, depending on the user’s requirements. In constant-current mode, the device is set up to maintain a constant output current, regardless of the output voltage. In this mode, the power FET is switched over time, as the load current changes, in order to keep the output current stable. In constant-voltage mode, the power MOSFET is switched by the PWM to keep the output voltage at a fixed level.
The outputs from both channels can be connected together, either in parallel or in series, depending on the desired output voltage. The output dimension of each channel is determined by the internal voltage references of the device, with a maximum voltage of 18V and a minimum of 0.5V. The LTC7851IUHH#PBF uses a single pulse-width modulation (PWM) signal to control the two separate channels. The PWM signal is generated by an external signal, either a voltage or a resistor depending on the user’s needs.
Features
The LTC7851IUHH#PBF belongs to the family of pulse width modulation (PWM) controllers, classified under PMIC – Voltage Regulators – DC DC Switching Controllers. The features of this device are summarized below:
- Dual-channel design for independent voltage switching
- Operates over wide input and output voltage range (18V to 0.5V)
- Uses single pulse-width modulation signal to control both channels independently
- Independent channels can be connected to the same output for different voltage configurations
- Integrated synchronous rectifier for higher efficiency
- Integrated primary and secondary FETs with precise current sensing
- Automatic frequency switching as per input and output loads
- Automatic protection against overload, short-circuiting, and thermal shutdown
- Compatible with both linear and switching power supplies
Applications
The LTC7851IUHH#PBF is an ideal solution for automotive applications, power adapters, portable electronics, and other DC–DC conversion applications. It is also suitable for field-powered industrial applications such as motion control and serial communication systems, as well as for industrial automation, medical equipment, and smart home applications.
The device is designed to work with a wide range of input and output voltages, making it an excellent choice for applications that require a precise and reliable supply voltage. Additionally, the LTC7851IUHH#PBF is designed for high performance and cost-sensitive applications, making it an ideal option for those applications that require efficient power management.
Conclusion
The LTC7851IUHH#PBF is an excellent choice for DC–DC conversion applications. It is a dual-channel Pulse-Width Modulation (PWM) switching controller, categorized under PMIC – Voltage Regulators – DC DC Switching Controllers, which operates efficiently over a wide input and output voltage range. The device is ideal for applications that require precise and reliable supply voltage, with the added benefit of high performance and cost-sensitivity.