Input voltage range: 2.9V~5.5V I2C configurable output voltage range: 0.3V~1.09V or 0.6V~1.39V, 6.25mV per step Maximum output current: 3A 2.4MHz PWM, seamless switching between PWM/PFM, meeting light load efficiency Dynamic output voltage regulation and configurable voltage adjustment rate Excellent load response and linear response speed Static current reaches 48 uA in FPM; I2C interface supports SM, FM, FM+, and HS modes FLT status indication Complete protection mechanism: (1) Input undervoltage protection (UVLO); (2) Input overvoltage protection (OVP); (3) Output overcurrent protection and short-circuit protection (OCP and SCP); (4) Overtemperature protection (OTP) package DFN1X1-4 and the SOT23-5 package

The SY5101 is a buck converter chip that supports I2C editing to dynamically adjust the output voltage. The input voltage range is 2.9V~5.5V, and the output voltage range is 0.3V~1.394V. The I2C can compile a 7-bit DAC with a step size of 6.25mV, dynamically adjusting the output voltage and supporting adjustment of the voltage change rate.
The SY5101 supports a 3A output current while maintaining an efficiency as high as 80%. Even at low currents (<10mA), it maintains 80% conversion efficiency. The SY5101 operates at a fixed frequency of 2.4MHz in PWM mode. The higher operating frequency allows for the use of lower inductance inductors to meet the requirements of output voltage ripple and loop stability. A 0.33uH or 0.47uH inductor is recommended.
The SY5101 has a built-in zero-current detection (ZCD) function. It can enter pulse frequency modulation (PFM) under light loads, resulting in lower static operating current, higher efficiency, and excellent load and linear response speeds. After the load current increases, the SY5101 switches to pulse width modulation (PWM) mode at a fixed frequency of 2.4MHz, resulting in smaller output voltage ripple and better load response speed. If needed, PFM can be disabled via I2C control, allowing the chip to always operate in PWM (FPWM). In shutdown mode, the SY5101 operating current is reduced to less than 1µA, reducing system power consumption. The SY5101 supports remote sensing, allowing the voltage feedback sampling point to be placed at the power demand end, providing more accurate output voltage and better load response speed. The SY5101 uses WLCP-15 packaging with dimensions of 2.01mm*1.21mm.