LTC3569IUD#TRPBF

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The LTC3569IUD#TRPBF by Linear Technology Corporation is a monolithic synchronous step-down DC/DC switching regulator offering high efficiency and excellent regulation. The device, packaged in a tiny 1.2 mm × 1.2 mm QFN-16 package, is designed to operate over a wide input voltage range from 2.7 V to 5.5 V with external components. It offers up to 1.5 A of continuous output current with very low dropout voltages and maintains a high efficiency at all load current levels.

Features

• Input Voltage Range: 2.7 V to 5.5 V
• Output Voltage Range: 0.8 V to 3.6 V
• Max Output Current: 1.5 A
• Dropout Voltage: 200 mV
• Efficiency: Up to 96%
• Reverse Current Protection
• Internal Soft Start
• Continuously Variable Frequency (0.7 MHz – 1.2 MHz)
• Package: Single Channel in 1.2 mm × 1.2 mm QFN-16

Application

The LTC3569IUD#TRPBF is an ideal solution for power management in applications such as those in consumer, communications and computing markets where highly efficient operation, small size, and low cost are required. The device is well suited for powering low-voltage digital cores, display supplies and other output currents requiring low-dropout regulation.

The device is also an excellent choice for providing core voltage to FPGAs, ASICs, and other devices requiring an adjustable core voltage. With an accurate initial voltage calibration and no external passive components required, significant size reduction compared to linear regulators can be achieved.

Principle of Operation

The LTC3569IUD#TRPBF utilizes a synchronous, current-mode, fixed-frequency, pulse-width modulation (PWM) control to regulate the output voltage across a wide range of input voltages and load conditions. The switching frequency is set by an internal oscillator and is continuously adjustable between 0.7 MHz and 1.2 MHz for optimal efficiency as the load current changes.

The device uses a single external resistor to set the output voltage; an internal reference measures and monitors the voltage at the output and provides feedback to the PWM comparator.

The device utilizes a dual N-channel MOSFET architecture and includes both a high-side and a low-side driver. The high-side driver, which is the primary switching element of the regulator, is controlled by Reference Voltage Comparator, while the low-side driver is controlled by the high-side gate driver.

The device uses an integrated charge-pump, internal soft start, and reverse current protection to protect the system from incorrect user configuration, over-voltage conditions, and reverse-battery connection.

Conclusion

The LTC3569IUD#TRPBF is an advanced monolithic synchronous step-down DC/DC switching regulator with a wide input voltage range, excellent efficiency and excellent regulation. The device is ideal for powering low-voltage digital cores, display supplies and other output currents requiring low-dropout regulation. The current mode, fixed frequency PWM operation and the adjustable switching frequency provides the user with an ideal solution for power management in a variety of applications.

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