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The SYQ5255 is a high-efficiency synchronous buck converter with a constant on-time(COT)control mode.
Within a wide input supply range of 2.7V to 16V, it can achieve up to 20A of continuous output current and 24A valley inductor current.
The SYQ5255 operates at high efficiency over a wide output current load range.
The SYQ5255 adopts an internal compensation, eliminating the need for external components.
It supports differential remote sense, enabling the voltage feedback point to be placed closer to the power supply demand end of the subsequent stage,
ensuring a more precise output voltage and fast transient response.
The SYQ5255 can be configured with different switching frequencies to adapt to different inductance values and EMI scenarios.
The switching frequencies of 600kHz, 800kHz, and 1MHz can be configured by the external pull-down resistor of the MODE pin, along with two working modes: SKIP and FCCM mode.
The SYQ5255 incorporates a zero-cross detection(ZCD) mechanism,which enables it to transition to pulse frequency modulation (SKIP-mode) during light-load conditions. This function achieves a low quiescent operating current and high efficiency while maintaining excellent load and linear response characteristics.
In shutdown mode, the operating current of SYQ5255 drops below 1uA, significantly reducing system power consumption.
The SYQ5255 is available in a 4mm*3mm FCQFN package with 21-pin.
4V to 16V input rang
e without external bias
2.7V to 16V input range with external bias
ranging from 4.8V to 5.5V
20A continuous output current
Output voltage range: 0.6V to 5.5V
Output reference voltage: 6V, ±1%
Up to 93% efficiency at VIN=12V,VOUT=1V
Differential remote sense
External reference input for voltage tracking
1.0µA current into VIN pin during shutdown
Programmable soft-start time
Programmable valley current limit
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