IP2021CPBF

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PMIC - Voltage Regulators - DC DC Switching Regulators - IP2021CPBF Application Field and Working Principle

IP2021CPBF, also known as integrated 2A buck type Power IC, is a synchronous step down regulator which can be used to generate low-voltage DC power supply. The device consists of a low-side power MOSFET, high-side power MOSFET, internal oscillator, PWM control circuit and protection circuits. According to its data sheet, it is targeted for notebook PC application. It typically offers up to 95% efficiency and allows a wide output current range from 0.1A to 2A.

Power MOSFET

The IP2021CPBF uses two Power MOSFET transistors to regulate the output voltage. The MOSFETs are connected in a buck topology and operate in a synchronous mode. The high-side MOSFET is controlled by the internal PWM control circuit while the low-side is controlled by the floating driver. The internal PWM control circuit sets the switching frequency of the MOSFETs and ensures that the output voltage is regulated to the required level. The IP2021CPBF has an internal under-voltage lockout (UVLO) circuit which implements a hysteresis to prevent it from switching on if the voltage is too low. In addition, the device also has a built-in over-voltage protection (OVP) circuit that is activated if the output voltage reaches a certain level.

Internal Oscillator

The internal oscillator of the IP2021CPBF sets the frequency of the switching cycle. The device has a frequency range of 150 kHz to 1.25 MHz. The frequency can be adjusted by changing the external resistive or capacitive components or by programming the resistive divider connected to the control pin. The oscillator is controlled by a switching current that is derived from an external resistor and an internal reference current. The oscillator then oscillates at the frequency determined by the switching current.

PWM Control and Protection Circuits

The IP2021CPBF has a PWM controller which implements a hysteresis mechanism that tracks the output voltage and adjusts the duty cycle of the internal MOSFETs to keep the output voltage stabilized. The device also contains an over-temperature protection (OTP) circuit which trips if the temperature of the device reaches a certain level. The device also has a built-in under-voltage lockout (UVLO) circuit that prevents the device from operating if the input voltage is too low.

Applications

The IP2021CPBF can be used in a wide variety of applications including notebook PCs, digital still cameras, mobile phones, PDAs, and many other battery operated devices. The device is especially well-suited for applications that require a low input voltage and a high switch frequency. The device can also be used to generate low-voltage supplies for CCDs and other logic circuits. The IP2021CPBF can handle input voltages from 4V to 20V and can generate output voltages as low as 0.8V.

Conclusion

The IP2021CPBF is a high performance synchronous buck-type DC-DC switching regulator that is specially designed for notebook PC applications. The device is equipped with high-side and low-side power MOSFETs, an internal oscillator, PWM control and protection circuits. The device can be used in a wide range of applications including PDAs, digital cameras, mobile phones, and other battery-operated devices. The device offers up to 95% efficiency and can be used to generate output voltages as low as 0.8V.

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