FSL136HR

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FSL136HR is a integrated, wide VIN range synchronous rectification buck regulator that consists of an internal topology core controller, integration MOSFETs, FB resistor and compensation networks. The device is designed to provide an ultra-low Iq current which isideal for low-power high efficiency applications such as battery-powered portable applications. Its integrated MOSFETs, high-side and low-side have already been optimized for the power stage topology, so it has greatly simplified the drive, BOM size and cost of the end-use system.

Application Field

FSL136HR offers a variety of features that make it suitable for use in a number of applications. It can be used to regulate the voltage of a wide range of low-power high-efficiency applications such as battery-powered portable applications, including laptops, smartphones and smart watches. The device’s wide input voltage range of 2.5V - 12V makes it ideal for use in home appliances and automobile and other power systems. In addition, it is suitable for small mobile and industrial applications such as drone control, vending machines, aerial vehicles, industrial robots, etc.

Working Principle

The FSL136HR works by regulating the output voltage with a pulse-width modulated (PWM) signal. It is capable of operating over a wide input range of 2.5V to 12V. At lower input voltages, the feedback regulation loop maintains a constant output voltage across a load, while at higher input voltages, the output voltage is limited to the setpoint voltage. The device can be driven by an external error amplifier, allowing the user to control more than just the output voltage, but also the current limit. The MOSFETs are designed to be highly efficient, which reduces wasted energy when in switching mode, resulting in higher power efficiency.

The FSL136HR input capacitors provide the initial supply of energy and once the output voltage level is obtained, the inductor stores energy so that the input capacitors can be continually replenished. During each cycle, when the inductor is charging, the high side MOSFET is turned on and the current starts to flow. The low side MOSFET then follows, allowing the current from the input to charge the inductor. When the inductor is fully charged, the device discharges the energy stored in it through the output capacitors. The output filter capacitors act as a low pass filter and provide power to the load when the device is in the off-state.

Conclusion

The FSL136HR is an integrated synchronous rectification buck regulator capable of providing high efficiency and ultra-low Iq current for a wide range of low power applications. It has a wide input voltage range of 2.5V - 12V and is suitable for battery-powered portable devices, home appliances and automobile applications. The device works by regulating the output voltage with a pulse-width modulated signal and its integrated MOSFETs, high-side and low-side, have been optimized to greatly reduce the drive, BOM size and cost of the end-use system.

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