RT5047BFGSP Integrated Circuits (ICs)

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Applications:	Converter, LNB
Voltage - Input:	8 V ~ 16 V
Number of Outputs:	1
Voltage - Output:	13.3V, 18.3V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	8-SOIC (0.154", 3.90mm Width) Exposed Pad
Supplier Device Package:	8-SOP

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RT5047BFGSP Application Field and Working Principle

The RT5047BFGSP of Richtek is a high-performance switching regulator family especially designed for various low-voltage application fields. It provides a low quiescent current operation, high accuracy output voltage regulation, fast transient response, and low-noise operation. This series can create a continuous load current up to 6A with the standard component. Due to its excellent performance and low power consumption, this series is suitable for applications including micro-controller unit (MCU), DSP, Cellular Base Station (BS), Small Outline Dual In-line Memory Module (SODIMM), and other digital and analog circuits that need constant and clean power supply.

The RT5047BFGSP adopts synchronous Buck switching with pulse-width modulation (PWM) control, featuring low output ripple noise and excellent dynamic response. It also achieves high power conversion efficiency and very low standby power consumption. The device integrates dedicated over current protection, short-circuit protection, and thermal protection to safeguard against unexpected thermal stress or over current events. The output voltage is set by one or two external resistors, allowing flexibility to meet different voltage requirements. In addition, the RT5047BFGSP has various built-in functions to further enhance user’s system performance.

Functional Block Diagram

The functional block diagram of the RT5050BFGSP is shown in Figure 1. The device comprises an integrated switches, current-sense amplifier, over current protector, Thermal Shutdown, feedback loop and power MOSFETs. The following will explain the working principle of this regulator step by step.

Step 1 – Power On:

The circuit is powered on by applying a voltage to the VIN pin. The gate of the outlet MOSFETs is pulled low through the internal Start-up circuit regardless of the state of the ENABLE pin. At the same time, the internal Start-up circuit enables a small start-up current that can flow through the MOSFETs and charge the output capacitor. Additionally, the power-on reset circuit is triggered to reset the feedback loop,which keeps the output voltage constant.

Step 2 - Regulation:

Once the output capacitor is charged, the RT5047BFGSP begins the regulation phase. In the regulation phase, the input voltage is fed to an internal voltage divider to generate the voltage at the FB pin. The voltage at FB pin is fed to the error amplifier, which in turn sets the duty cycle of the internal switching MOSFETs. The internal MOSFETs are switched with a fixed frequency at the output current to maintain a constant output voltage.

Step 3- Over current Protection:

The RT5047BFGSP can detect an over current condition at any load current by monitoring the voltage across a resistor placed in series with the power MOSFETs. When the voltage is above the predetermined threshold, the OCP circuit will shutdown the power MOSFETs and the device will enter into the latching mode. In the latch mode, the power MOSFETs will remain off until the circuit is reset.

Step 4 - Thermal Protection:

The RT5047BFGSP has a built-in thermal protection feature that prevents it from operating under thermal overload conditions. When the temperature exceeds the set threshold, the thermal protection circuit will shutdown the device until the temperature returns to normal. The shutdown will cause the device to enter the hiccup mode, where the device will be enabled and disabled after a pre-determined time interval until the temperature is normal.

Conclusion

The RT5047BFGSP of Richtek is a high-performance switching regulator family especially designed for various low-voltage application fields. It provides a low quiescent current operation, high accuracy output voltage regulation, fast transient response, and low-noise operation. This series can create a continuous load current up to 6A with the standard component and offers various built-in functions, such as over-current protection and thermal protection, to further enhance user’s system performance. The RT5047BFGSP adopts synchronous Buck switching with pulse-width modulation (PWM) control, and achieves high power conversion efficiency and very low standby power consumption. Therefore, it is suitable for applications including micro-controller unit (MCU), DSP, cellular base station (BS), small outline dual in-line memory module (SODIMM), and other digital and analog circuits that need constant and clean power supply.

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