LTC3602EUF#PBF

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PMIC - Voltage Regulators - DC DC Switching Regulators

The LTC3602EUF#PBF is a current-mode synchronous buck regulator that can operate at a fixed 1.2V or adjustable output voltage. It is designed for low-power applications, taking as low as 1.2V input and delivering up to 1A of load current. Utilizing a synchronous rectification scheme, the device provides better than 90% efficiency, reduces input and output ripple current, and reduces the number of external components required. Its wide input voltage range, low quiescent current, fast transient response and accurate regulated output voltage make the LTC3602EUF#PBF an ideal choice for powering low-power digital and analog circuits in a variety of applications.

Application field

• Consumer electronics: mobile phones, cordless phones, PDAs, laptops etc.
• Portable applications: digital cameras, MP3 players, portable medical instruments, etc.
• Wearable applications: fitness trackers, smart watches, etc.
• Industrial control systems
• Automotive applications

Working Principle

The LTC3602EUF#PBF utilizes a current-mode architecture with fixed frequency oscillator to create a synchronous buck regulator. When the switching transistor is on, the current from the inductor is simplified to the sum of the load current and the sense resistor current. Therefore by controlling the current through the sense resistor, the output voltage of the LTC3602EUF#PBF can be precisely regulated. To maximize efficiency, it employs synchronous rectification, where the high side switch is synchronously driven to meet the load current.

During the switch on period of the switching transistor, the control logic starts with the minimum duty cycle, and the voltage across the sense resistor ramps until it reaches a threshold voltage. At this point, the duty cycle is increased to maintain the sense voltage at a predetermined reference. The duty cycle is adjusted until the maximum safe duty limit is reached. When the current through the switch or the input voltage drops, the duty cycle is decreased accordingly to maintain the output voltage.

Conclusion

The LTC3602EUF#PBF is a current-mode synchronous buck regulator that is designed for low-power applications. It provides high efficiency, low quiescent current, fast transient response, and accurate regulated output voltage, making it an ideal choice for powering low-power digital and analog circuits in a variety of applications, such as consumer electronics, portable and wearable applications, industrial control systems, and automotive applications.

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