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LTC1699EMS8-82#PBF application field and working principle

PMIC - Power Management - Specialized

The LTC1699EMS8-82#PBF is a specialized, low power, high frequency, synchronous step-down DC/DC converter. In addition, it features excellent power efficiency, current mode architecture, and fixed frequency operation. It has a wide input voltage range and is suitable for a wide variety of applications including, but not limited to, battery powered systems and low input voltage conditions.The LTC1699EMS8-82#PBF is designed to operate at a high switching frequency of up to 1.8MHz, enabling the use of small external components with less heat dissipation. Additionally, the power efficiency and current mode architecture ensure efficient transfer of power to the output voltage. The device offers an excellent transient response, providing an output voltage that remains within specified accuracy during load transients.The device comprises two stages, the pulse width modulator (PWM) and the power stage, which operates as a fixed frequency, current mode synchronous buck regulator. The PWM stage is frequency-compensated, allowing for a stable loop response with a wide range of capacitors and inductors. The power stage features current mode operation and includes adjustable output current limit ensuring that the output voltage is regulated to within the specified error.The device also offers the convenience of programmable soft-start time, enabling smooth management of inrush current in the application. The device is also compatible with a wide range of external components and can be easily configured with a small number of external components.The LTC1699EMS8-82#PBF is packaged in a small 8-Lead thermally enhanced plastic DFN package, making it an ideal choice for space-critical applications. The device is also RoHS and halogen free, making it a great choice for applications requiring low-power, high-efficiency DC/DC conversion.

Applications

• Portable applications
• Handheld electronics
• Medical devices
• Systems requiring high energy efficiency
• Battery powered systems
• Low input voltage conditions

Working Principle

The LTC1699EMS8-82#PBF is powered from an input voltage, VIN, ranging from 4V to 18V. The internal PWM control loop regulates the output voltage, VOUT, to its set point by controlling ON/OFF switching of the internal power switch, which drives an external inductor. The inductor current is sensed through an internal current sense resistor, which generates an error signal that is compared to a reference voltage. The resulting error signal is then amplified by the internal error amplifier, which sets the duty cycle of the internal power switch.The output voltage is regulated by adjusting the duty cycle of the power switch. The power switch is turned ON when the voltage across the inductor reaches the maximum level, due to current flow through the inductor. The power switch is then turned OFF when the current sensing resistor detects a decrease in inductor current. The output voltage is maintained at the set point by controlling the ON and OFF time of the power switch.The LTC1699EMS8-82#PBF also features a programmable soft-start time, so that the current through the inductor is slightly ramped at startup, reducing any inrush current. The device also features adjustable current limit and shutdown, allowing for precise control over the output voltage and current limits.

Conclusion

The LTC1699EMS8-82#PBF is a low-power, high-frequency, synchronous step-down DC/DC converter with excellent power efficiency, current mode architecture and fixed frequency operation, offering many advantages such as an input voltage range from 4V to 18V and an adjustable output current limit. In addition, the device is packaged in a small 8-Lead thermally enhanced plastic DFN package, making it an excellent choice for space-critical applications.

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