S-812C37BPI-C4RTFG

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S-812C37BPI-C4RTFG application field and working principle

The S-812C37BPI-C4RTFG is a voltage regulator from the S-812 series of low dropout regulators from Seiko Electronics Corporation. The controller chip is an independent linear regulator that can provide stable output to maintain power supply in the system over a wide range of input voltage. It is widely applied in battery-operated electronic devices and device with high-power dissipation such as LCD TV and monitors. With the advantage of accurate current control and excellent ripple rejection, it\'s became a best solutions to bring the benefit of saving power in green energy revolution.

Features of S-812C37BPI-C4RTFG

• Low dropout voltage (600mV)
• Wide input voltage range (2.2V to 16V)
• Fast turn-on (10μs)
• Accurate current control
• Excellent ripple rejection
• Compatible with Lead Free requirements
• Excellent thermal performance

Specifications of S-812C37BPI-C4RTFG

• Input Voltage: 2.2V to 16V
• Output Voltage: 1.2V to 9V
• Dropout Voltage: 600mV (typical)
• Ripple Rejection: 70dB at 5KHz
• Temperature Range: -40℃ to +85℃

Working Principle of S-812C37BPI-C4RTFG

The S-812C37BPI-C4RTFG controller chip uses an independent linear regulator to maintain power supply throughout a wide range of input voltage. A voltage reference is established on the chip to ensure the accuracy of the output voltage. A cascoded P-channel MOSFET and a bipolar NPN transistor are used as the pass elements to reduce the internal power dissipation. The P-channel MOSFET helps regulate the pass transistor\'s base current, which provides the linear regulation.

The primary input voltage first goes through a power transistor before storing in an output capacitor. The current-sensing resistor is connected in series to the output node in order to sense the output current as well as the voltage drop across the resistor. The input voltage is also sensed by a resistor divider which provides the signal to the regulator. The regulator then adjusts the output current and the voltage by modulating the signal voltage of the divider circuit.

In order to provide fast turn-on, the S-812C37BPI-C4RTFG chip contains an internal start-up circuit. This circuit provides the necessary base current to the pass transistor during start-up, thus helping to ensure that the output quickly rises to the programmed output voltage. The S-812C37BPI-C4RTFG chip is capable of accurately maintaining the current, even at a low input voltage. It also provides excellent ripple rejection for better performance.

Conclusion

The S-812C37BPI-C4RTFG is a voltage regulator from the S-812 series of low dropout regulators from Seiko Electronics Corporation. It uses an independent linear regulator with a cascoded P-channel MOSFET as the pass element and bipolar NPN transistor as the pass element to reduce power dissipation and provide accurate current control. It is capable of providing fast turn-on, excellent ripple rejection and low power dissipation. Therefore, it is widely applied in battery-operated electronic devices and device with high-power dissipation such as LCD TV and monitors.

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